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From: Ian Campbell <ian.campbell@citrix.com>
To: xen-devel <xen-devel@lists.xen.org>
Date: Thu, 3 Dec 2015 11:21:15 +0000
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Cc: Wei Liu <wei.liu2@citrix.com>,
	Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
	Ian Jackson <Ian.Jackson@eu.citrix.com>, qemu-devel@nongnu.org,
	minios-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: [Minios-devel] [PATCH v6 0/<VARIOUS>] Begin to disentangle
 libxenctrl and provide some stable libraries
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From minios-devel-bounces@lists.xenproject.org Thu Dec 03 11:22:16 2015
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From: Ian Campbell <ian.campbell@citrix.com>
To: xen-devel <xen-devel@lists.xen.org>
Date: Thu, 3 Dec 2015 11:21:15 +0000
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Cc: Wei Liu <wei.liu2@citrix.com>,
	Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
	Ian Jackson <Ian.Jackson@eu.citrix.com>, qemu-devel@nongnu.org,
	minios-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: [Minios-devel] [PATCH v6 0/<VARIOUS>] Begin to disentangle
 libxenctrl and provide some stable libraries
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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 0/5] Begin to disentangle
	libxenctrl and provide some stable libraries
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We intend to stabilise some parts of the libxenctrl interface by
splitting out some functionality into separate stable libraries.

This is the mini-os part of the first phase of that change.

This mail is (or is intended to be) a reply to a "0/<VARIOUS>"
super-intro mail covering all of the related patch series and which
contains more details.

Ian Campbell (5):
  mini-os: Include libxentoollog with libxc
  mini-os: Include libxenevtchn with libxc
  mini-os: Include libxengnttab with libxc
  mini-os: Include libxencall with libxc
  mini-os: Include libxenforeignmemory with libxc

 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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	libxentoollog with libxc
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libxentoollog has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxentoollog if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 2cb5e51..daee46c 100644
--- a/Makefile
+++ b/Makefile
@@ -165,6 +165,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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We intend to stabilise some parts of the libxenctrl interface by
splitting out some functionality into separate stable libraries.

This is the mini-os part of the first phase of that change.

This mail is (or is intended to be) a reply to a "0/<VARIOUS>"
super-intro mail covering all of the related patch series and which
contains more details.

Ian Campbell (5):
  mini-os: Include libxentoollog with libxc
  mini-os: Include libxenevtchn with libxc
  mini-os: Include libxengnttab with libxc
  mini-os: Include libxencall with libxc
  mini-os: Include libxenforeignmemory with libxc

 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 1/5] mini-os: Include
	libxentoollog with libxc
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libxentoollog has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxentoollog if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 2cb5e51..daee46c 100644
--- a/Makefile
+++ b/Makefile
@@ -165,6 +165,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 3/5] mini-os: Include libxengnttab
	with libxc
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libxengnttab has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxengnttab if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index d1d8dc4..521f647 100644
--- a/Makefile
+++ b/Makefile
@@ -167,6 +167,7 @@ ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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libxengnttab has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxengnttab if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index d1d8dc4..521f647 100644
--- a/Makefile
+++ b/Makefile
@@ -167,6 +167,7 @@ ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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	<xen-devel@lists.xen.org>
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libxenevtchn has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxenevtchn if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index daee46c..d1d8dc4 100644
--- a/Makefile
+++ b/Makefile
@@ -166,6 +166,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 4/5] mini-os: Include libxencall
	with libxc
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libxencall has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxencall if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 521f647..c900540 100644
--- a/Makefile
+++ b/Makefile
@@ -168,6 +168,7 @@ ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 2/5] mini-os: Include libxenevtchn
	with libxc
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libxenevtchn has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxenevtchn if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index daee46c..d1d8dc4 100644
--- a/Makefile
+++ b/Makefile
@@ -166,6 +166,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v6 4/5] mini-os: Include libxencall
	with libxc
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libxencall has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxencall if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 521f647..c900540 100644
--- a/Makefile
+++ b/Makefile
@@ -168,6 +168,7 @@ ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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	<xen-devel@lists.xen.org>
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	libxenforeignmemory with libxc
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libxenforeignmemory has just been split out from libxc. From mini-os's
point of view we don't care about the distinction, so keep things
simple by just including libxenforeignmemory if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index c900540..cfe015a 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,7 @@ APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-ar
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/foreignmemory -whole-archive -lxenforeignmemory -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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libxenforeignmemory has just been split out from libxc. From mini-os's
point of view we don't care about the distinction, so keep things
simple by just including libxenforeignmemory if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index c900540..cfe015a 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,7 @@ APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-ar
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/foreignmemory -whole-archive -lxenforeignmemory -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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Date: Sun, 6 Dec 2015 03:19:57 +0100
From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?=
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Subject: [Minios-devel] Double gnttab_end_access in mini-os netfront
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Hi,

When running HVM on Xen 4.6 with qemu in stubdom, I've found that
something goes wrong with disk frontend (at least that was visible
problem - a lot of read and write errors in stubdom log). But further
debugging (including -DGNT_DEBUG) leads to double gnttab_end_access in
netfront.=20

The stack trace is:
ASSERTION FAILED: !(!inuse[ref]) at gnttab.c:42.
Do_exit called!
0x00000000000f3ffb: get_time_values_from_xen at xen-4.6.0/extras/mini-os/ar=
ch/x86/time.c:134 (discriminator 1)
0x00000000000d74a8: HYPERVISOR_sched_op at xen-4.6.0/extras/mini-os/include=
/x86/x86_64/hypercall-x86_64.h:180
0x00000000000d6a2e: put_free_entry at xen-4.6.0/extras/mini-os/gnttab.c:43
0x00000000000d6bff: gnttab_end_access at xen-4.6.0/extras/mini-os/gnttab.c:=
115
0x00000000000d8a50: network_rx at xen-4.6.0/extras/mini-os/netfront.c:134
0x00000000000d9ec4: netfront_receive at xen-4.6.0/extras/mini-os/netfront.c=
:671
0x00000000000dd302: get_current at xen-4.6.0/extras/mini-os/include/x86/arc=
h_sched.h:16
0x0000000000079f72: tap_send at xen-4.6.0/stubdom/../tools/qemu-xen-traditi=
onal/net.c:756
0x00000000000069f9: main_loop_wait at xen-4.6.0/stubdom/../tools/qemu-xen-t=
raditional/vl.c:3826
0x0000000000021f27: main_loop at xen-4.6.0/stubdom/../tools/qemu-xen-tradit=
ional/i386-dm/helper2.c:612 (discriminator 1)
0x000000000000950d: quit_timers at xen-4.6.0/stubdom/../tools/qemu-xen-trad=
itional/vl.c:1866
0x00000000000d7f57: call_main at xen-4.6.0/extras/mini-os/main.c:163
0x0000000000003423: thread_starter at :?
0x0000000000000000: _start at ??:?

It was working in Xen 4.4. The only commit touching xenfront.c (in any
meaningful way) from that time is this one:
http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f348390652=
a67e9356eec9cd2b0f76a9c7c72

With that commit reverted, issue vanishes.

I guess it's because before this commit, there was "if (rx->status =3D=3D
NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
that case is handled after gnttab_end_access (using "if (rx->status >
NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
line.

PS What is the correct place for such reports? minios-devel? xen-devel?
both?

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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Hi,

When running HVM on Xen 4.6 with qemu in stubdom, I've found that
something goes wrong with disk frontend (at least that was visible
problem - a lot of read and write errors in stubdom log). But further
debugging (including -DGNT_DEBUG) leads to double gnttab_end_access in
netfront.=20

The stack trace is:
ASSERTION FAILED: !(!inuse[ref]) at gnttab.c:42.
Do_exit called!
0x00000000000f3ffb: get_time_values_from_xen at xen-4.6.0/extras/mini-os/ar=
ch/x86/time.c:134 (discriminator 1)
0x00000000000d74a8: HYPERVISOR_sched_op at xen-4.6.0/extras/mini-os/include=
/x86/x86_64/hypercall-x86_64.h:180
0x00000000000d6a2e: put_free_entry at xen-4.6.0/extras/mini-os/gnttab.c:43
0x00000000000d6bff: gnttab_end_access at xen-4.6.0/extras/mini-os/gnttab.c:=
115
0x00000000000d8a50: network_rx at xen-4.6.0/extras/mini-os/netfront.c:134
0x00000000000d9ec4: netfront_receive at xen-4.6.0/extras/mini-os/netfront.c=
:671
0x00000000000dd302: get_current at xen-4.6.0/extras/mini-os/include/x86/arc=
h_sched.h:16
0x0000000000079f72: tap_send at xen-4.6.0/stubdom/../tools/qemu-xen-traditi=
onal/net.c:756
0x00000000000069f9: main_loop_wait at xen-4.6.0/stubdom/../tools/qemu-xen-t=
raditional/vl.c:3826
0x0000000000021f27: main_loop at xen-4.6.0/stubdom/../tools/qemu-xen-tradit=
ional/i386-dm/helper2.c:612 (discriminator 1)
0x000000000000950d: quit_timers at xen-4.6.0/stubdom/../tools/qemu-xen-trad=
itional/vl.c:1866
0x00000000000d7f57: call_main at xen-4.6.0/extras/mini-os/main.c:163
0x0000000000003423: thread_starter at :?
0x0000000000000000: _start at ??:?

It was working in Xen 4.4. The only commit touching xenfront.c (in any
meaningful way) from that time is this one:
http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f348390652=
a67e9356eec9cd2b0f76a9c7c72

With that commit reverted, issue vanishes.

I guess it's because before this commit, there was "if (rx->status =3D=3D
NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
that case is handled after gnttab_end_access (using "if (rx->status >
NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
line.

PS What is the correct place for such reports? minios-devel? xen-devel?
both?

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?=
	<marmarek@invisiblethingslab.com>
To: Ian Campbell <ian.campbell@citrix.com>
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	Samuel Thibault <samuel.thibault@ens-lyon.org>,
	Martin Lucina <martin@lucina.net>, xen-devel <xen-devel@lists.xen.org>
Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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On Tue, Dec 08, 2015 at 11:33:49AM +0000, Ian Campbell wrote:
> On Sun, 2015-12-06 at 03:19 +0100, Marek Marczykowski-G=C3=B3recki wrote:
> > Hi,
> >=20
> > When running HVM on Xen 4.6 with qemu in stubdom, I've found that
> > something goes wrong with disk frontend (at least that was visible
> > problem - a lot of read and write errors in stubdom log). But further
> > debugging (including -DGNT_DEBUG) leads to double gnttab_end_access in
> > netfront.=20
> >=20
> > The stack trace is:
> > ASSERTION FAILED: !(!inuse[ref]) at gnttab.c:42.
> > Do_exit called!
> > 0x00000000000f3ffb: get_time_values_from_xen at xen-4.6.0/extras/mini-
> > os/arch/x86/time.c:134 (discriminator 1)
> > 0x00000000000d74a8: HYPERVISOR_sched_op at xen-4.6.0/extras/mini-
> > os/include/x86/x86_64/hypercall-x86_64.h:180
> > 0x00000000000d6a2e: put_free_entry at xen-4.6.0/extras/mini-
> > os/gnttab.c:43
> > 0x00000000000d6bff: gnttab_end_access at xen-4.6.0/extras/mini-
> > os/gnttab.c:115
> > 0x00000000000d8a50: network_rx at xen-4.6.0/extras/mini-os/netfront.c:1=
34
> > 0x00000000000d9ec4: netfront_receive at xen-4.6.0/extras/mini-
> > os/netfront.c:671
> > 0x00000000000dd302: get_current at xen-4.6.0/extras/mini-
> > os/include/x86/arch_sched.h:16
> > 0x0000000000079f72: tap_send at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/net.c:756
> > 0x00000000000069f9: main_loop_wait at xen-4.6.0/stubdom/../tools/qemu-
> > xen-traditional/vl.c:3826
> > 0x0000000000021f27: main_loop at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/i386-dm/helper2.c:612 (discriminator 1)
> > 0x000000000000950d: quit_timers at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/vl.c:1866
> > 0x00000000000d7f57: call_main at xen-4.6.0/extras/mini-os/main.c:163
> > 0x0000000000003423: thread_starter at :?
> > 0x0000000000000000: _start at ??:?
> >=20
> > It was working in Xen 4.4. The only commit touching xenfront.c (in any
> > meaningful way) from that time is this one:
> > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f34839=
0652a67e
> > 9356eec9cd2b0f76a9c7c72
> >=20
> > With that commit reverted, issue vanishes.
> >=20
> > I guess it's because before this commit, there was "if (rx->status =3D=
=3D
> > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
> > that case is handled after gnttab_end_access (using "if (rx->status >
> > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > line.
>=20
> That sounds pretty plausible to me (FWIW). Have you tried it?

I've tried moving gnttab_end_access into that if branch. And it didn't
worked.

> > PS What is the correct place for such reports? minios-devel? xen-devel?
> > both?
>=20
> Formally I suppose the former, but realistically including xen-devel as
> well is likely to attract more eyes.
>=20
> Ian.

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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_______________________________________________
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http://lists.xenproject.org/cgi-bin/mailman/listinfo/minios-devel
--===============3457317032106305407==--


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From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?=
	<marmarek@invisiblethingslab.com>
To: Ian Campbell <ian.campbell@citrix.com>
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	Samuel Thibault <samuel.thibault@ens-lyon.org>,
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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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On Tue, Dec 08, 2015 at 11:33:49AM +0000, Ian Campbell wrote:
> On Sun, 2015-12-06 at 03:19 +0100, Marek Marczykowski-G=C3=B3recki wrote:
> > Hi,
> >=20
> > When running HVM on Xen 4.6 with qemu in stubdom, I've found that
> > something goes wrong with disk frontend (at least that was visible
> > problem - a lot of read and write errors in stubdom log). But further
> > debugging (including -DGNT_DEBUG) leads to double gnttab_end_access in
> > netfront.=20
> >=20
> > The stack trace is:
> > ASSERTION FAILED: !(!inuse[ref]) at gnttab.c:42.
> > Do_exit called!
> > 0x00000000000f3ffb: get_time_values_from_xen at xen-4.6.0/extras/mini-
> > os/arch/x86/time.c:134 (discriminator 1)
> > 0x00000000000d74a8: HYPERVISOR_sched_op at xen-4.6.0/extras/mini-
> > os/include/x86/x86_64/hypercall-x86_64.h:180
> > 0x00000000000d6a2e: put_free_entry at xen-4.6.0/extras/mini-
> > os/gnttab.c:43
> > 0x00000000000d6bff: gnttab_end_access at xen-4.6.0/extras/mini-
> > os/gnttab.c:115
> > 0x00000000000d8a50: network_rx at xen-4.6.0/extras/mini-os/netfront.c:1=
34
> > 0x00000000000d9ec4: netfront_receive at xen-4.6.0/extras/mini-
> > os/netfront.c:671
> > 0x00000000000dd302: get_current at xen-4.6.0/extras/mini-
> > os/include/x86/arch_sched.h:16
> > 0x0000000000079f72: tap_send at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/net.c:756
> > 0x00000000000069f9: main_loop_wait at xen-4.6.0/stubdom/../tools/qemu-
> > xen-traditional/vl.c:3826
> > 0x0000000000021f27: main_loop at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/i386-dm/helper2.c:612 (discriminator 1)
> > 0x000000000000950d: quit_timers at xen-4.6.0/stubdom/../tools/qemu-xen-
> > traditional/vl.c:1866
> > 0x00000000000d7f57: call_main at xen-4.6.0/extras/mini-os/main.c:163
> > 0x0000000000003423: thread_starter at :?
> > 0x0000000000000000: _start at ??:?
> >=20
> > It was working in Xen 4.4. The only commit touching xenfront.c (in any
> > meaningful way) from that time is this one:
> > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f34839=
0652a67e
> > 9356eec9cd2b0f76a9c7c72
> >=20
> > With that commit reverted, issue vanishes.
> >=20
> > I guess it's because before this commit, there was "if (rx->status =3D=
=3D
> > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
> > that case is handled after gnttab_end_access (using "if (rx->status >
> > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > line.
>=20
> That sounds pretty plausible to me (FWIW). Have you tried it?

I've tried moving gnttab_end_access into that if branch. And it didn't
worked.

> > PS What is the correct place for such reports? minios-devel? xen-devel?
> > both?
>=20
> Formally I suppose the former, but realistically including xen-devel as
> well is likely to attract more eyes.
>=20
> Ian.

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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_______________________________________________
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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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Ian Campbell, on Tue 08 Dec 2015 11:33:49 +0000, wrote:
> > http://xenbits.xen.org/gitweb/?p=mini-os.git;a=commit;h=7c8f348390652a67e
> > 9356eec9cd2b0f76a9c7c72
> > 
> > With that commit reverted, issue vanishes.
> > 
> > I guess it's because before this commit, there was "if (rx->status ==
> > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
> > that case is handled after gnttab_end_access (using "if (rx->status >
> > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > line.
> 
> That sounds pretty plausible to me (FWIW). Have you tried it?

That looks right, indeed.

Samuel

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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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Ian Campbell, on Tue 08 Dec 2015 11:33:49 +0000, wrote:
> > http://xenbits.xen.org/gitweb/?p=mini-os.git;a=commit;h=7c8f348390652a67e
> > 9356eec9cd2b0f76a9c7c72
> > 
> > With that commit reverted, issue vanishes.
> > 
> > I guess it's because before this commit, there was "if (rx->status ==
> > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but now
> > that case is handled after gnttab_end_access (using "if (rx->status >
> > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > line.
> 
> That sounds pretty plausible to me (FWIW). Have you tried it?

That looks right, indeed.

Samuel

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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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Marek Marczykowski-G=F3recki, on Tue 08 Dec 2015 12:46:31 +0100, wrote:
> > > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f348=
390652a67e
> > > 9356eec9cd2b0f76a9c7c72
> > > =

> > > With that commit reverted, issue vanishes.
> > > =

> > > I guess it's because before this commit, there was "if (rx->status =
=3D=3D
> > > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but =
now
> > > that case is handled after gnttab_end_access (using "if (rx->status >
> > > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > > line.
> > =

> > That sounds pretty plausible to me (FWIW). Have you tried it?
> =

> I've tried moving gnttab_end_access into that if branch. And it didn't
> worked.

Which if branch?  Please show the code, C is less ambiguous than english
:)

Samuel

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Marek Marczykowski-G=F3recki, on Tue 08 Dec 2015 12:46:31 +0100, wrote:
> > > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8f348=
390652a67e
> > > 9356eec9cd2b0f76a9c7c72
> > > =

> > > With that commit reverted, issue vanishes.
> > > =

> > > I guess it's because before this commit, there was "if (rx->status =
=3D=3D
> > > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)", but =
now
> > > that case is handled after gnttab_end_access (using "if (rx->status >
> > > NETIF_RSP_NULL)"). I think the fix would be to restore that "continue"
> > > line.
> > =

> > That sounds pretty plausible to me (FWIW). Have you tried it?
> =

> I've tried moving gnttab_end_access into that if branch. And it didn't
> worked.

Which if branch?  Please show the code, C is less ambiguous than english
:)

Samuel

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Cc: minios-devel@lists.xenproject.org,
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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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On Tue, Dec 08, 2015 at 12:11:34PM +0000, Ian Campbell wrote:
> On Tue, 2015-12-08 at 13:00 +0100, Samuel Thibault wrote:
> > Marek Marczykowski-G=C3=B3recki, on Tue 08 Dec 2015 12:46:31 +0100, wro=
te:
> > > > > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8=
f3483906
> > > > > 52a67e
> > > > > 9356eec9cd2b0f76a9c7c72
> > > > >=20
> > > > > With that commit reverted, issue vanishes.
> > > > >=20
> > > > > I guess it's because before this commit, there was "if (rx->status
> > > > > =3D=3D
> > > > > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)",
> > > > > but now
> > > > > that case is handled after gnttab_end_access (using "if (rx->stat=
us=20
> > > > > >
> > > > > NETIF_RSP_NULL)"). I think the fix would be to restore that
> > > > > "continue"
> > > > > line.
> > > >=20
> > > > That sounds pretty plausible to me (FWIW). Have you tried it?
> > >=20
> > > I've tried moving gnttab_end_access into that if branch. And it didn't
> > > worked.
> >=20
> > Which if branch?=C2=A0=C2=A0Please show the code, C is less ambiguous t=
han english
> > :)
>=20
> Details of in which way it didn't work would also be useful, I expect.

I don't have my test environment handy, but the change was:
--- netfront.c.orig     2015-12-08 13:29:04.913000000 +0100
+++ netfront.c  2015-12-08 13:29:24.060000000 +0100
@@ -122,10 +122,10 @@
=20
         buf =3D &dev->rx_buffers[id];
         page =3D (unsigned char*)buf->page;
-        gnttab_end_access(buf->gref);
=20
         if (rx->status > NETIF_RSP_NULL)
         {
+        gnttab_end_access(buf->gref);
 #ifdef HAVE_LIBC
            if (dev->netif_rx =3D=3D NETIF_SELECT_RX) {
                int len =3D rx->status;


But to be frank, I'm not entirely sure that the tested version was
really with this patch, as stubdom building code is quite convolved...
The crash was the same, but I'll test it again to be sure.

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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_______________________________________________
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Date: Tue, 8 Dec 2015 13:32:53 +0100
From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?=
	<marmarek@invisiblethingslab.com>
To: Ian Campbell <ian.campbell@citrix.com>
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Cc: minios-devel@lists.xenproject.org,
	Samuel Thibault <samuel.thibault@ens-lyon.org>,
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Subject: Re: [Minios-devel] Double gnttab_end_access in mini-os netfront
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On Tue, Dec 08, 2015 at 12:11:34PM +0000, Ian Campbell wrote:
> On Tue, 2015-12-08 at 13:00 +0100, Samuel Thibault wrote:
> > Marek Marczykowski-G=C3=B3recki, on Tue 08 Dec 2015 12:46:31 +0100, wro=
te:
> > > > > http://xenbits.xen.org/gitweb/?p=3Dmini-os.git;a=3Dcommit;h=3D7c8=
f3483906
> > > > > 52a67e
> > > > > 9356eec9cd2b0f76a9c7c72
> > > > >=20
> > > > > With that commit reverted, issue vanishes.
> > > > >=20
> > > > > I guess it's because before this commit, there was "if (rx->status
> > > > > =3D=3D
> > > > > NETIF_RSP_NULL) continue" before "gnttab_end_access(buf->gref)",
> > > > > but now
> > > > > that case is handled after gnttab_end_access (using "if (rx->stat=
us=20
> > > > > >
> > > > > NETIF_RSP_NULL)"). I think the fix would be to restore that
> > > > > "continue"
> > > > > line.
> > > >=20
> > > > That sounds pretty plausible to me (FWIW). Have you tried it?
> > >=20
> > > I've tried moving gnttab_end_access into that if branch. And it didn't
> > > worked.
> >=20
> > Which if branch?=C2=A0=C2=A0Please show the code, C is less ambiguous t=
han english
> > :)
>=20
> Details of in which way it didn't work would also be useful, I expect.

I don't have my test environment handy, but the change was:
--- netfront.c.orig     2015-12-08 13:29:04.913000000 +0100
+++ netfront.c  2015-12-08 13:29:24.060000000 +0100
@@ -122,10 +122,10 @@
=20
         buf =3D &dev->rx_buffers[id];
         page =3D (unsigned char*)buf->page;
-        gnttab_end_access(buf->gref);
=20
         if (rx->status > NETIF_RSP_NULL)
         {
+        gnttab_end_access(buf->gref);
 #ifdef HAVE_LIBC
            if (dev->netif_rx =3D=3D NETIF_SELECT_RX) {
                int len =3D rx->status;


But to be frank, I'm not entirely sure that the tested version was
really with this patch, as stubdom building code is quite convolved...
The crash was the same, but I'll test it again to be sure.

--=20
Best Regards,
Marek Marczykowski-G=C3=B3recki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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_______________________________________________
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From: Ian Campbell <ian.campbell@citrix.com>
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Date: Wed, 16 Dec 2015 12:30:07 +0000
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	minios-devel@lists.xenproject.org, samuel.thibault@ens-lyon.org,
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Subject: [Minios-devel] [PATCH v7 0/<VARIOUS>] Begin to disentangle
 libxenctrl and provide some stable libraries
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From: Ian Campbell <ian.campbell@citrix.com>
To: xen-devel <xen-devel@lists.xen.org>
Date: Wed, 16 Dec 2015 12:30:07 +0000
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Subject: [Minios-devel] [PATCH v7 0/<VARIOUS>] Begin to disentangle
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From minios-devel-bounces@lists.xenproject.org Wed Dec 16 12:32:41 2015
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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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	libxenctrl and provide some stable libraries
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We intend to stabilise some parts of the libxenctrl interface by
splitting out some functionality into separate stable libraries.

This is the mini-os part of the first phase of that change.

This mail is (or is intended to be) a reply to a "0/<VARIOUS>"
super-intro mail covering all of the related patch series and which
contains more details.

Ian Campbell (4):
  mini-os: Include libxenevtchn with libxc
  mini-os: Include libxengnttab with libxc
  mini-os: Include libxencall with libxc
  mini-os: Include libxenforeignmemory with libxc

 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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	libxenctrl and provide some stable libraries
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We intend to stabilise some parts of the libxenctrl interface by
splitting out some functionality into separate stable libraries.

This is the mini-os part of the first phase of that change.

This mail is (or is intended to be) a reply to a "0/<VARIOUS>"
super-intro mail covering all of the related patch series and which
contains more details.

Ian Campbell (4):
  mini-os: Include libxenevtchn with libxc
  mini-os: Include libxengnttab with libxc
  mini-os: Include libxencall with libxc
  mini-os: Include libxenforeignmemory with libxc

 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.1.4


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	<xen-devel@lists.xen.org>
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	with libxc
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libxengnttab has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxengnttab if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index d1d8dc4..521f647 100644
--- a/Makefile
+++ b/Makefile
@@ -167,6 +167,7 @@ ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
To: <ian.jackson@eu.citrix.com>, <wei.liu2@citrix.com>,
	<xen-devel@lists.xen.org>
Date: Wed, 16 Dec 2015 12:32:28 +0000
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Subject: [Minios-devel] [PATCH MINI-OS v7 2/4] mini-os: Include libxengnttab
	with libxc
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libxengnttab has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxengnttab if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index d1d8dc4..521f647 100644
--- a/Makefile
+++ b/Makefile
@@ -167,6 +167,7 @@ ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v7 4/4] mini-os: Include
	libxenforeignmemory with libxc
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libxenforeignmemory has just been split out from libxc. From mini-os's
point of view we don't care about the distinction, so keep things
simple by just including libxenforeignmemory if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index c900540..cfe015a 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,7 @@ APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-ar
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/foreignmemory -whole-archive -lxenforeignmemory -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v7 4/4] mini-os: Include
	libxenforeignmemory with libxc
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libxenforeignmemory has just been split out from libxc. From mini-os's
point of view we don't care about the distinction, so keep things
simple by just including libxenforeignmemory if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index c900540..cfe015a 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,7 @@ APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-ar
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/foreignmemory -whole-archive -lxenforeignmemory -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From minios-devel-bounces@lists.xenproject.org Wed Dec 16 12:33:31 2015
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	<xen-devel@lists.xen.org>
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Subject: [Minios-devel] [PATCH MINI-OS v7 3/4] mini-os: Include libxencall
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libxencall has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxencall if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 521f647..c900540 100644
--- a/Makefile
+++ b/Makefile
@@ -168,6 +168,7 @@ ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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libxencall has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxencall if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 521f647..c900540 100644
--- a/Makefile
+++ b/Makefile
@@ -168,6 +168,7 @@ ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/gnttab -whole-archive -lxengnttab -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/call -whole-archive -lxencall -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
Date: Wed, 16 Dec 2015 12:32:27 +0000
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Subject: [Minios-devel] [PATCH MINI-OS v7 1/4] mini-os: Include libxenevtchn
	with libxc
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libxenevtchn has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxenevtchn if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index daee46c..d1d8dc4 100644
--- a/Makefile
+++ b/Makefile
@@ -166,6 +166,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: Ian Campbell <ian.campbell@citrix.com>
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	<xen-devel@lists.xen.org>
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libxenevtchn has just been split out from libxc. From mini-os's point
of view we don't care about the distinction, so keep things simple by
just including libxenevtchn if libxc is enabled.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
v2: Adjust for libs/$lib layout.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index daee46c..d1d8dc4 100644
--- a/Makefile
+++ b/Makefile
@@ -166,6 +166,7 @@ OBJS := $(filter-out $(OBJ_DIR)/lwip%.o $(LWO), $(OBJS))
 ifeq ($(libc),y)
 ifeq ($(CONFIG_XC),y)
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/toollog -whole-archive -lxentoollog -no-whole-archive
+APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libs-$(MINIOS_TARGET_ARCH)/evtchn -whole-archive -lxenevtchn -no-whole-archive
 APP_LDLIBS += -L$(XEN_ROOT)/stubdom/libxc-$(MINIOS_TARGET_ARCH) -whole-archive -lxenguest -lxenctrl -no-whole-archive
 endif
 APP_LDLIBS += -lpci
-- 
2.1.4


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From: "Misra Pankaj Kumar (RBEI/EEA2)" <Pankaj.Kumar@in.bosch.com>
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Subject: [Minios-devel] Regarding Mini-os boot up on xen arm
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Hello,

I am facing problem during mini-os boot-up. The execution breaks while chec=
king for fdt_check_header while calling fdt32_to_cpu. I think it is not abl=
e to use the address of the dtb provided during arch_init.
The address i can see is 0x08400000.

(d3) Virtual -> physical offset =3D 3fc00000
(d3) Checking DTB at 08400000...
(d3) Fault handler at 004081ac called (prefetch_abort)

after this it dumps registers.

I am not understanding where have we specified the address of dtb, and firs=
t of all we have not compiled any dtb with mini-os, so which dtb will be us=
ed here ?

--> I came to know after some gooogling that xen provides DTB to guest os.

I checked verbose output of "xl create" and came to know that xen tools are=
 allocating some space and populating it with DTB info, but since that addr=
ess is virtual and so is changing every time, i can not hardcode it into r2=
 register.

So i want to know how xen passes DTB to guest os.

Thanks,
Pankaj


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<p><span lang=3D"EN-US">Hello,<o:p></o:p></span></p>
<p><span lang=3D"EN-US">I am facing problem during mini-os boot-up. The exe=
cution breaks while checking for fdt_check_header while calling fdt32_to_cp=
u. I think it is not able to use the address of the dtb provided during arc=
h_init.<br>
The address i can see is 0x08400000.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">(d3) Virtual -&gt; physical offset =3D 3fc00000<br>
(d3) Checking DTB at 08400000...<br>
(d3) Fault handler at 004081ac called (prefetch_abort)<o:p></o:p></span></p=
>
<p><span lang=3D"EN-US">after this it dumps registers.<o:p></o:p></span></p=
>
<p><span lang=3D"EN-US">I am not understanding where have we specified the =
address of dtb, and first of all we have not compiled any dtb with mini-os,=
 so which dtb will be used here ?<o:p></o:p></span></p>
<p><span lang=3D"EN-US">--&gt; I came to know after some gooogling that xen=
 provides DTB to guest os.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">I checked verbose output of &quot;xl create&quot; a=
nd came to know that xen tools are allocating some space and populating it =
with DTB info, but since that address is virtual and so is changing every t=
ime, i can not hardcode it into r2 register.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">So i want to know how xen passes DTB to guest os.<o=
:p></o:p></span></p>
<p>Thanks,<br>
Pankaj<o:p></o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
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From: "Misra Pankaj Kumar (RBEI/EEA2)" <Pankaj.Kumar@in.bosch.com>
To: "minios-devel@lists.xenproject.org" <minios-devel@lists.xenproject.org>
Thread-Topic: Regarding Mini-os boot up on xen arm
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Subject: [Minios-devel] Regarding Mini-os boot up on xen arm
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Hello,

I am facing problem during mini-os boot-up. The execution breaks while chec=
king for fdt_check_header while calling fdt32_to_cpu. I think it is not abl=
e to use the address of the dtb provided during arch_init.
The address i can see is 0x08400000.

(d3) Virtual -> physical offset =3D 3fc00000
(d3) Checking DTB at 08400000...
(d3) Fault handler at 004081ac called (prefetch_abort)

after this it dumps registers.

I am not understanding where have we specified the address of dtb, and firs=
t of all we have not compiled any dtb with mini-os, so which dtb will be us=
ed here ?

--> I came to know after some gooogling that xen provides DTB to guest os.

I checked verbose output of "xl create" and came to know that xen tools are=
 allocating some space and populating it with DTB info, but since that addr=
ess is virtual and so is changing every time, i can not hardcode it into r2=
 register.

So i want to know how xen passes DTB to guest os.

Thanks,
Pankaj


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<div class=3D"WordSection1">
<p><span lang=3D"EN-US">Hello,<o:p></o:p></span></p>
<p><span lang=3D"EN-US">I am facing problem during mini-os boot-up. The exe=
cution breaks while checking for fdt_check_header while calling fdt32_to_cp=
u. I think it is not able to use the address of the dtb provided during arc=
h_init.<br>
The address i can see is 0x08400000.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">(d3) Virtual -&gt; physical offset =3D 3fc00000<br>
(d3) Checking DTB at 08400000...<br>
(d3) Fault handler at 004081ac called (prefetch_abort)<o:p></o:p></span></p=
>
<p><span lang=3D"EN-US">after this it dumps registers.<o:p></o:p></span></p=
>
<p><span lang=3D"EN-US">I am not understanding where have we specified the =
address of dtb, and first of all we have not compiled any dtb with mini-os,=
 so which dtb will be used here ?<o:p></o:p></span></p>
<p><span lang=3D"EN-US">--&gt; I came to know after some gooogling that xen=
 provides DTB to guest os.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">I checked verbose output of &quot;xl create&quot; a=
nd came to know that xen tools are allocating some space and populating it =
with DTB info, but since that address is virtual and so is changing every t=
ime, i can not hardcode it into r2 register.<o:p></o:p></span></p>
<p><span lang=3D"EN-US">So i want to know how xen passes DTB to guest os.<o=
:p></o:p></span></p>
<p>Thanks,<br>
Pankaj<o:p></o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
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--===============4387499298614287841==--



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From: Eric Shelton <eshelton@pobox.com>
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Subject: [Minios-devel] Fwd: [Xen-devel] Xen Security Advisory 155
 (CVE-2015-8550) - paravirtualized drivers incautious about shared memory
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---------- Forwarded message ----------
From: Eric Shelton <eshelton@pobox.com>
Date: Mon, Dec 21, 2015 at 6:10 PM
Subject: Re: [Xen-devel] Xen Security Advisory 155 (CVE-2015-8550) -
paravirtualized drivers incautious about shared memory
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Stefano
Stabellini <stefano.stabellini@eu.citrix.com>, Samuel Thibault
<samuel.thibault@ens-lyon.org>, security@xen.org

[also copying minios-devel]

Seeing as "All OSes providing PV backends are susceptible," doesn't
this include MiniOS for QEMU stubdom as well?  Are there patches
available for mini-os/blkfront.c, mini-os/netfront.c, and
mini-os/pcifront.c?  I didn't see anything for this.

Best,
Eric

On Thu, Dec 17, 2015 at 1:36 PM, Xen.org security team <security@xen.org> wrote:
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>             Xen Security Advisory CVE-2015-8550 / XSA-155
>                               version 6
>
>     paravirtualized drivers incautious about shared memory contents
>
> UPDATES IN VERSION 6
> ====================
>
> Correct CREDITS section.
>
> ISSUE DESCRIPTION
> =================
>
> The compiler can emit optimizations in the PV backend drivers which
> can lead to double fetch vulnerabilities. Specifically the shared
> memory between the frontend and backend can be fetched twice (during
> which time the frontend can alter the contents) possibly leading to
> arbitrary code execution in backend.
>
> IMPACT
> ======
>
> Malicious guest administrators can cause denial of service.  If driver
> domains are not in use, the impact can be a host crash, or privilege escalation.
>
> VULNERABLE SYSTEMS
> ==================
>
> Systems running PV or HVM guests are vulnerable.
>
> ARM and x86 systems are vulnerable.
>
> All OSes providing PV backends are susceptible, this includes
> Linux and NetBSD. By default the Linux distributions compile kernels
> with optimizations.
>
> MITIGATION
> ==========
>
> There is no mitigation.
>
> CREDITS
> =======
>
> This issue was discovered by Felix Wilhelm (ERNW Research, KIT /
> Operating Systems Group).
>
> RESOLUTION
> ==========
>
> Applying the appropriate attached patches should fix the problem for
> PV backends.  Note only that PV backends are fixed; PV frontend
> patches will be developed and released (publicly) after the embargo
> date.
>
> Please note that there is a bug in some versions of gcc,
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 which can cause the
> construct used in RING_COPY_REQUEST() to be ineffective in some
> circumstances. We have determined that this is only the case when the
> structure being copied consists purely of bitfields. The Xen PV
> protocols updated here do not use bitfields in this way and therefore
> these patches are not subject to that bug. However authors of third
> party PV protocols should take this into consideration.
>
> Linux v4.4:
> xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
> xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
> xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
> xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
> xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
> Linux v4.[0,1,2,3]
> All the above patches except #5 will apply, please use:
> xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> Linux v3.19:
> All the above patches except #5 and #6 will apply, please use:
> xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> xsa155-linux319-0006-xen-scsiback-safely-copy-requests.patch
>
> qemu-xen:
> xsa155-qemu-qdisk-double-access.patch
> xsa155-qemu-xenfb.patch
>
> qemu-traditional:
> xsa155-qemut-qdisk-double-access.patch
> xsa155-qemut-xenfb.patch
>
> NetBSD 7.0:
> xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
> xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
> xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
> xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
> xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>
> xen:
> xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
> xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
> xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>
> xen 4.4:
> All patches except #3 will apply, please use:
> xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>
> $ sha256sum xsa155*
> d9fbc104ab2ae797971e351ee0e04e7b7e9c7c33385309bb406c7941dc9a33b4  xsa155-linux319-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> 590656d83ad7b6052b54659eccb3469658b3942c0dc1366423a66f2f5ac643e1  xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> 2bd18632178e09394c5cd06aded2c14bcc6b6e360ad6e81827d24860fe3e8ca4  xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
> cecdeccb8e2551252c81fc5f164a8298005df714a574a7ba18b84e8ed5f2bb70  xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
> 3916b847243047f0e1053233ade742c14a7f29243584e60bf5db4842a8068855  xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
> 746c8eb0aeb200d76156c88dfbbd49db79f567b88b07eda70f7c7d095721f05a  xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
> 18517a184a02f7441065b8d3423086320ec4c2345c00d551231f7976381767f5  xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> 2e6d556d25b1cc16e71afde665ae3908f4fa8eab7e0d96283fc78400301baf92  xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> 5e130d8b61906015c6a94f8edd3cce97b172f96a265d97ecf370e7b45125b73d  xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
> 08c2d0f95dcc215165afbce623b6972b81dd45b091b5f40017579b00c8612e03  xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
> 0a66010f736092f91f70bb0fd220685e4395efef1db6d23a3d1eace31d144f51  xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
> 5e913a8427cab6b4d384d1246e05116afc301eb117edd838101eb53a82c2f2ff  xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
> 3b8f14eafaed3a7bc66245753a37af4249acf8129fbedb70653192252dc47dc9  xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
> 81ae5fa998243a78dad749fc561be647dc1dc1be799e8f18484fdf0989469705  xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
> 044ff74fa048df820d528f64f2791ec9cb3940bd313c1179020bd49a6cde2ca3  xsa155-qemu-qdisk-double-access.patch
> 1150504589eb7bfa108c80ce63395e57d0e627b12d9201219d968fdd026919a6  xsa155-qemut-qdisk-double-access.patch
> 63186246ab6913b54bfef5f09f33e815935ac40ff821c27a3efda62339bbbd5f  xsa155-qemut-xenfb.patch
> e53b4ac298648cde79344192d5a58ca8d8724344f5105bec7c09eef095c668f6  xsa155-qemu-xenfb.patch
> e52467fcec73bcc86d3e96d06f8ca8085ae56a83d2c42a30c16bc3dc630d8f8a  xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
> eae34c8ccc096ad93a74190506b3d55020a88afb0cc504a3a514590e9fd746fd  xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
> 42780265014085a4221ad32b026214693d751789eb5219e2e83862c0006c66f4  xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
> dfcaddb8a908a4fc1b048a43187e885117e67dc566f5c841037ee366dcd437d1  xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
> $
>
> DEPLOYMENT DURING EMBARGO
> =========================
>
> Deployment of the patches and/or mitigations described above (or
> others which are substantially similar) is permitted during the
> embargo, even on public-facing systems with untrusted guest users and
> administrators.
>
> But: Distribution of updated software is prohibited (except to other
> members of the predisclosure list).
>
> Predisclosure list members who wish to deploy significantly different
> patches and/or mitigations, please contact the Xen Project Security
> Team.
>
> (Note: this during-embargo deployment notice is retained in
> post-embargo publicly released Xen Project advisories, even though it
> is then no longer applicable.  This is to enable the community to have
> oversight of the Xen Project Security Team's decisionmaking.)
>
> For more information about permissible uses of embargoed information,
> consult the Xen Project community's agreed Security Policy:
>   http://www.xenproject.org/security-policy.html
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.12 (GNU/Linux)
>
> iQEcBAEBAgAGBQJWcrpdAAoJEIP+FMlX6CvZ9soIALqQ/GHP6bZn2LqJTD9DIzsm
> zVB4yCPiVfDqHSOq9QNCzBzqpvOX+RhKTzRH1jsZczr8CSnkePxaCrmZgH8SAygB
> hFcF9xJGlJDjs647sgpQmYs++3mgD/57uml7IW/8NX46tXUelVByW7muNgUN2xlm
> kjeD8auJEs+jK1iwpt/hOmYe4moRx3+3ujfgqMCNAWtqZz9D9wM5tao+p6yKYlhM
> u8hSi1V3b7sAbf92mwzpzfpbwdgg25xeHtZ/oJxp/ZY0FhqDEsTxV+h8HjD/Eink
> GwqPS19O77tMmz9fUUTyJDSsU7ayFRI0HyYmXju4eJktJkhXagjAdCSyGky9z5g=
> =FlX2
> -----END PGP SIGNATURE-----

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Subject: [Minios-devel] Fwd: [Xen-devel] Xen Security Advisory 155
 (CVE-2015-8550) - paravirtualized drivers incautious about shared memory
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---------- Forwarded message ----------
From: Eric Shelton <eshelton@pobox.com>
Date: Mon, Dec 21, 2015 at 6:10 PM
Subject: Re: [Xen-devel] Xen Security Advisory 155 (CVE-2015-8550) -
paravirtualized drivers incautious about shared memory
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Stefano
Stabellini <stefano.stabellini@eu.citrix.com>, Samuel Thibault
<samuel.thibault@ens-lyon.org>, security@xen.org

[also copying minios-devel]

Seeing as "All OSes providing PV backends are susceptible," doesn't
this include MiniOS for QEMU stubdom as well?  Are there patches
available for mini-os/blkfront.c, mini-os/netfront.c, and
mini-os/pcifront.c?  I didn't see anything for this.

Best,
Eric

On Thu, Dec 17, 2015 at 1:36 PM, Xen.org security team <security@xen.org> wrote:
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>             Xen Security Advisory CVE-2015-8550 / XSA-155
>                               version 6
>
>     paravirtualized drivers incautious about shared memory contents
>
> UPDATES IN VERSION 6
> ====================
>
> Correct CREDITS section.
>
> ISSUE DESCRIPTION
> =================
>
> The compiler can emit optimizations in the PV backend drivers which
> can lead to double fetch vulnerabilities. Specifically the shared
> memory between the frontend and backend can be fetched twice (during
> which time the frontend can alter the contents) possibly leading to
> arbitrary code execution in backend.
>
> IMPACT
> ======
>
> Malicious guest administrators can cause denial of service.  If driver
> domains are not in use, the impact can be a host crash, or privilege escalation.
>
> VULNERABLE SYSTEMS
> ==================
>
> Systems running PV or HVM guests are vulnerable.
>
> ARM and x86 systems are vulnerable.
>
> All OSes providing PV backends are susceptible, this includes
> Linux and NetBSD. By default the Linux distributions compile kernels
> with optimizations.
>
> MITIGATION
> ==========
>
> There is no mitigation.
>
> CREDITS
> =======
>
> This issue was discovered by Felix Wilhelm (ERNW Research, KIT /
> Operating Systems Group).
>
> RESOLUTION
> ==========
>
> Applying the appropriate attached patches should fix the problem for
> PV backends.  Note only that PV backends are fixed; PV frontend
> patches will be developed and released (publicly) after the embargo
> date.
>
> Please note that there is a bug in some versions of gcc,
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 which can cause the
> construct used in RING_COPY_REQUEST() to be ineffective in some
> circumstances. We have determined that this is only the case when the
> structure being copied consists purely of bitfields. The Xen PV
> protocols updated here do not use bitfields in this way and therefore
> these patches are not subject to that bug. However authors of third
> party PV protocols should take this into consideration.
>
> Linux v4.4:
> xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
> xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
> xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
> xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
> xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
> Linux v4.[0,1,2,3]
> All the above patches except #5 will apply, please use:
> xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> Linux v3.19:
> All the above patches except #5 and #6 will apply, please use:
> xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> xsa155-linux319-0006-xen-scsiback-safely-copy-requests.patch
>
> qemu-xen:
> xsa155-qemu-qdisk-double-access.patch
> xsa155-qemu-xenfb.patch
>
> qemu-traditional:
> xsa155-qemut-qdisk-double-access.patch
> xsa155-qemut-xenfb.patch
>
> NetBSD 7.0:
> xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
> xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
> xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
> xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
> xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>
> xen:
> xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
> xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
> xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>
> xen 4.4:
> All patches except #3 will apply, please use:
> xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>
> $ sha256sum xsa155*
> d9fbc104ab2ae797971e351ee0e04e7b7e9c7c33385309bb406c7941dc9a33b4  xsa155-linux319-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> 590656d83ad7b6052b54659eccb3469658b3942c0dc1366423a66f2f5ac643e1  xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> 2bd18632178e09394c5cd06aded2c14bcc6b6e360ad6e81827d24860fe3e8ca4  xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
> cecdeccb8e2551252c81fc5f164a8298005df714a574a7ba18b84e8ed5f2bb70  xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
> 3916b847243047f0e1053233ade742c14a7f29243584e60bf5db4842a8068855  xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
> 746c8eb0aeb200d76156c88dfbbd49db79f567b88b07eda70f7c7d095721f05a  xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
> 18517a184a02f7441065b8d3423086320ec4c2345c00d551231f7976381767f5  xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
> 2e6d556d25b1cc16e71afde665ae3908f4fa8eab7e0d96283fc78400301baf92  xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
> 5e130d8b61906015c6a94f8edd3cce97b172f96a265d97ecf370e7b45125b73d  xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
> 08c2d0f95dcc215165afbce623b6972b81dd45b091b5f40017579b00c8612e03  xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
> 0a66010f736092f91f70bb0fd220685e4395efef1db6d23a3d1eace31d144f51  xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
> 5e913a8427cab6b4d384d1246e05116afc301eb117edd838101eb53a82c2f2ff  xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
> 3b8f14eafaed3a7bc66245753a37af4249acf8129fbedb70653192252dc47dc9  xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
> 81ae5fa998243a78dad749fc561be647dc1dc1be799e8f18484fdf0989469705  xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
> 044ff74fa048df820d528f64f2791ec9cb3940bd313c1179020bd49a6cde2ca3  xsa155-qemu-qdisk-double-access.patch
> 1150504589eb7bfa108c80ce63395e57d0e627b12d9201219d968fdd026919a6  xsa155-qemut-qdisk-double-access.patch
> 63186246ab6913b54bfef5f09f33e815935ac40ff821c27a3efda62339bbbd5f  xsa155-qemut-xenfb.patch
> e53b4ac298648cde79344192d5a58ca8d8724344f5105bec7c09eef095c668f6  xsa155-qemu-xenfb.patch
> e52467fcec73bcc86d3e96d06f8ca8085ae56a83d2c42a30c16bc3dc630d8f8a  xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
> eae34c8ccc096ad93a74190506b3d55020a88afb0cc504a3a514590e9fd746fd  xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
> 42780265014085a4221ad32b026214693d751789eb5219e2e83862c0006c66f4  xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
> dfcaddb8a908a4fc1b048a43187e885117e67dc566f5c841037ee366dcd437d1  xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
> $
>
> DEPLOYMENT DURING EMBARGO
> =========================
>
> Deployment of the patches and/or mitigations described above (or
> others which are substantially similar) is permitted during the
> embargo, even on public-facing systems with untrusted guest users and
> administrators.
>
> But: Distribution of updated software is prohibited (except to other
> members of the predisclosure list).
>
> Predisclosure list members who wish to deploy significantly different
> patches and/or mitigations, please contact the Xen Project Security
> Team.
>
> (Note: this during-embargo deployment notice is retained in
> post-embargo publicly released Xen Project advisories, even though it
> is then no longer applicable.  This is to enable the community to have
> oversight of the Xen Project Security Team's decisionmaking.)
>
> For more information about permissible uses of embargoed information,
> consult the Xen Project community's agreed Security Policy:
>   http://www.xenproject.org/security-policy.html
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.12 (GNU/Linux)
>
> iQEcBAEBAgAGBQJWcrpdAAoJEIP+FMlX6CvZ9soIALqQ/GHP6bZn2LqJTD9DIzsm
> zVB4yCPiVfDqHSOq9QNCzBzqpvOX+RhKTzRH1jsZczr8CSnkePxaCrmZgH8SAygB
> hFcF9xJGlJDjs647sgpQmYs++3mgD/57uml7IW/8NX46tXUelVByW7muNgUN2xlm
> kjeD8auJEs+jK1iwpt/hOmYe4moRx3+3ujfgqMCNAWtqZz9D9wM5tao+p6yKYlhM
> u8hSi1V3b7sAbf92mwzpzfpbwdgg25xeHtZ/oJxp/ZY0FhqDEsTxV+h8HjD/Eink
> GwqPS19O77tMmz9fUUTyJDSsU7ayFRI0HyYmXju4eJktJkhXagjAdCSyGky9z5g=
> =FlX2
> -----END PGP SIGNATURE-----

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From: Eric Shelton <eshelton@pobox.com>
Date: Tue, 22 Dec 2015 10:06:25 -0500
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: minios-devel@lists.xenproject.org,
	Samuel Thibault <samuel.thibault@ens-lyon.org>, security@xen.org,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [Minios-devel] [Xen-devel] Xen Security Advisory 155
 (CVE-2015-8550) - paravirtualized drivers incautious about shared memory
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The XSA mentions that "PV frontend patches will be developed and
released (publicly) after the embargo date."  Has anything been done
towards this that should also be incorporated into MiniOS?  On a
system utilizing a "driver domain," where a backend is running on a
domain that is considered unprivileged and untrusted (such as the
example described in http://wiki.xenproject.org/wiki/Driver_Domain),
it seems XSA-155-style double fetch vulnerabilities in the frontends
are also a potential security concern, and should be eliminated.
However, perhaps that does not include pcifront, since pciback would
always be running in dom0.

Eric

On Tue, Dec 22, 2015 at 7:24 AM, Stefano Stabellini
<stefano.stabellini@eu.citrix.com> wrote:
> MiniOS for QEMU stubdom has frontends, such as mini-os/blkfront.c and
> mini-os/netfront.c, not backends.
>
> Cheers,
>
> Stefano
>
>
> On Mon, 21 Dec 2015, Eric Shelton wrote:
>> Seeing as "All OSes providing PV backends are susceptible," doesn't this include MiniOS for QEMU stubdom as well?
>> Are there patches available for mini-os/blkfront.c, mini-os/netfront.c, and mini-os/pcifront.c?  I didn't see
>> anything for this.
>> Best,
>> Eric
>>
>> On Thu, Dec 17, 2015 at 1:36 PM, Xen.org security team <security@xen.org> wrote:
>>
>>       ----- Topal: Output generated on Tue Dec 22 12:23:44 GMT 2015 ----- Topal: GPG output starts ----- gpg:
>>       no valid OpenPGP data found. gpg: processing message failed: eof ----- Topal: GPG output ends -----
>>       ----- Topal: Original message starts ----- -----BEGIN PGP SIGNED MESSAGE-----
>>       Hash: SHA1
>>
>>                   Xen Security Advisory CVE-2015-8550 / XSA-155
>>                                     version 6
>>
>>           paravirtualized drivers incautious about shared memory contents
>>
>>       UPDATES IN VERSION 6
>>       ====================
>>
>>       Correct CREDITS section.
>>
>>       ISSUE DESCRIPTION
>>       =================
>>
>>       The compiler can emit optimizations in the PV backend drivers which
>>       can lead to double fetch vulnerabilities. Specifically the shared
>>       memory between the frontend and backend can be fetched twice (during
>>       which time the frontend can alter the contents) possibly leading to
>>       arbitrary code execution in backend.
>>
>>       IMPACT
>>       ======
>>
>>       Malicious guest administrators can cause denial of service.  If driver
>>       domains are not in use, the impact can be a host crash, or privilege escalation.
>>
>>       VULNERABLE SYSTEMS
>>       ==================
>>
>>       Systems running PV or HVM guests are vulnerable.
>>
>>       ARM and x86 systems are vulnerable.
>>
>>       All OSes providing PV backends are susceptible, this includes
>>       Linux and NetBSD. By default the Linux distributions compile kernels
>>       with optimizations.
>>
>>       MITIGATION
>>       ==========
>>
>>       There is no mitigation.
>>
>>       CREDITS
>>       =======
>>
>>       This issue was discovered by Felix Wilhelm (ERNW Research, KIT /
>>       Operating Systems Group).
>>
>>       RESOLUTION
>>       ==========
>>
>>       Applying the appropriate attached patches should fix the problem for
>>       PV backends.  Note only that PV backends are fixed; PV frontend
>>       patches will be developed and released (publicly) after the embargo
>>       date.
>>
>>       Please note that there is a bug in some versions of gcc,
>>       https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 which can cause the
>>       construct used in RING_COPY_REQUEST() to be ineffective in some
>>       circumstances. We have determined that this is only the case when the
>>       structure being copied consists purely of bitfields. The Xen PV
>>       protocols updated here do not use bitfields in this way and therefore
>>       these patches are not subject to that bug. However authors of third
>>       party PV protocols should take this into consideration.
>>
>>       Linux v4.4:
>>       xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
>>       xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
>>       xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
>>       xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
>>       Linux v4.[0,1,2,3]
>>       All the above patches except #5 will apply, please use:
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       Linux v3.19:
>>       All the above patches except #5 and #6 will apply, please use:
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       xsa155-linux319-0006-xen-scsiback-safely-copy-requests.patch
>>
>>       qemu-xen:
>>       xsa155-qemu-qdisk-double-access.patch
>>       xsa155-qemu-xenfb.patch
>>
>>       qemu-traditional:
>>       xsa155-qemut-qdisk-double-access.patch
>>       xsa155-qemut-xenfb.patch
>>
>>       NetBSD 7.0:
>>       xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
>>       xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
>>       xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
>>       xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>>
>>       xen:
>>       xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
>>       xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>>
>>       xen 4.4:
>>       All patches except #3 will apply, please use:
>>       xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>>
>>       $ sha256sum xsa155*
>>       d9fbc104ab2ae797971e351ee0e04e7b7e9c7c33385309bb406c7941dc9a33b4
>>       xsa155-linux319-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       590656d83ad7b6052b54659eccb3469658b3942c0dc1366423a66f2f5ac643e1
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       2bd18632178e09394c5cd06aded2c14bcc6b6e360ad6e81827d24860fe3e8ca4
>>       xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
>>       cecdeccb8e2551252c81fc5f164a8298005df714a574a7ba18b84e8ed5f2bb70
>>       xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
>>       3916b847243047f0e1053233ade742c14a7f29243584e60bf5db4842a8068855
>>       xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
>>       746c8eb0aeb200d76156c88dfbbd49db79f567b88b07eda70f7c7d095721f05a
>>       xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
>>       18517a184a02f7441065b8d3423086320ec4c2345c00d551231f7976381767f5
>>       xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       2e6d556d25b1cc16e71afde665ae3908f4fa8eab7e0d96283fc78400301baf92
>>       xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       5e130d8b61906015c6a94f8edd3cce97b172f96a265d97ecf370e7b45125b73d
>>       xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
>>       08c2d0f95dcc215165afbce623b6972b81dd45b091b5f40017579b00c8612e03
>>       xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
>>       0a66010f736092f91f70bb0fd220685e4395efef1db6d23a3d1eace31d144f51
>>       xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
>>       5e913a8427cab6b4d384d1246e05116afc301eb117edd838101eb53a82c2f2ff
>>       xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
>>       3b8f14eafaed3a7bc66245753a37af4249acf8129fbedb70653192252dc47dc9
>>       xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
>>       81ae5fa998243a78dad749fc561be647dc1dc1be799e8f18484fdf0989469705
>>       xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>>       044ff74fa048df820d528f64f2791ec9cb3940bd313c1179020bd49a6cde2ca3  xsa155-qemu-qdisk-double-access.patch
>>       1150504589eb7bfa108c80ce63395e57d0e627b12d9201219d968fdd026919a6
>>       xsa155-qemut-qdisk-double-access.patch
>>       63186246ab6913b54bfef5f09f33e815935ac40ff821c27a3efda62339bbbd5f  xsa155-qemut-xenfb.patch
>>       e53b4ac298648cde79344192d5a58ca8d8724344f5105bec7c09eef095c668f6  xsa155-qemu-xenfb.patch
>>       e52467fcec73bcc86d3e96d06f8ca8085ae56a83d2c42a30c16bc3dc630d8f8a
>>       xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
>>       eae34c8ccc096ad93a74190506b3d55020a88afb0cc504a3a514590e9fd746fd
>>       xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
>>       42780265014085a4221ad32b026214693d751789eb5219e2e83862c0006c66f4
>>       xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>>       dfcaddb8a908a4fc1b048a43187e885117e67dc566f5c841037ee366dcd437d1
>>       xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>>       $
>>
>>       DEPLOYMENT DURING EMBARGO
>>       =========================
>>
>>       Deployment of the patches and/or mitigations described above (or
>>       others which are substantially similar) is permitted during the
>>       embargo, even on public-facing systems with untrusted guest users and
>>       administrators.
>>
>>       But: Distribution of updated software is prohibited (except to other
>>       members of the predisclosure list).
>>
>>       Predisclosure list members who wish to deploy significantly different
>>       patches and/or mitigations, please contact the Xen Project Security
>>       Team.
>>
>>       (Note: this during-embargo deployment notice is retained in
>>       post-embargo publicly released Xen Project advisories, even though it
>>       is then no longer applicable.  This is to enable the community to have
>>       oversight of the Xen Project Security Team's decisionmaking.)
>>
>>       For more information about permissible uses of embargoed information,
>>       consult the Xen Project community's agreed Security Policy:
>>         http://www.xenproject.org/security-policy.html
>>       -----BEGIN PGP SIGNATURE-----
>>       Version: GnuPG v1.4.12 (GNU/Linux)
>>
>>       iQEcBAEBAgAGBQJWcrpdAAoJEIP+FMlX6CvZ9soIALqQ/GHP6bZn2LqJTD9DIzsm
>>       zVB4yCPiVfDqHSOq9QNCzBzqpvOX+RhKTzRH1jsZczr8CSnkePxaCrmZgH8SAygB
>>       hFcF9xJGlJDjs647sgpQmYs++3mgD/57uml7IW/8NX46tXUelVByW7muNgUN2xlm
>>       kjeD8auJEs+jK1iwpt/hOmYe4moRx3+3ujfgqMCNAWtqZz9D9wM5tao+p6yKYlhM
>>       u8hSi1V3b7sAbf92mwzpzfpbwdgg25xeHtZ/oJxp/ZY0FhqDEsTxV+h8HjD/Eink
>>       GwqPS19O77tMmz9fUUTyJDSsU7ayFRI0HyYmXju4eJktJkhXagjAdCSyGky9z5g=
>>       =FlX2
>>       -----END PGP SIGNATURE-----
>>
>> ----- Topal: Original message ends -----
>>

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From: Eric Shelton <eshelton@pobox.com>
Date: Tue, 22 Dec 2015 10:06:25 -0500
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: minios-devel@lists.xenproject.org,
	Samuel Thibault <samuel.thibault@ens-lyon.org>, security@xen.org,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [Minios-devel] [Xen-devel] Xen Security Advisory 155
 (CVE-2015-8550) - paravirtualized drivers incautious about shared memory
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The XSA mentions that "PV frontend patches will be developed and
released (publicly) after the embargo date."  Has anything been done
towards this that should also be incorporated into MiniOS?  On a
system utilizing a "driver domain," where a backend is running on a
domain that is considered unprivileged and untrusted (such as the
example described in http://wiki.xenproject.org/wiki/Driver_Domain),
it seems XSA-155-style double fetch vulnerabilities in the frontends
are also a potential security concern, and should be eliminated.
However, perhaps that does not include pcifront, since pciback would
always be running in dom0.

Eric

On Tue, Dec 22, 2015 at 7:24 AM, Stefano Stabellini
<stefano.stabellini@eu.citrix.com> wrote:
> MiniOS for QEMU stubdom has frontends, such as mini-os/blkfront.c and
> mini-os/netfront.c, not backends.
>
> Cheers,
>
> Stefano
>
>
> On Mon, 21 Dec 2015, Eric Shelton wrote:
>> Seeing as "All OSes providing PV backends are susceptible," doesn't this include MiniOS for QEMU stubdom as well?
>> Are there patches available for mini-os/blkfront.c, mini-os/netfront.c, and mini-os/pcifront.c?  I didn't see
>> anything for this.
>> Best,
>> Eric
>>
>> On Thu, Dec 17, 2015 at 1:36 PM, Xen.org security team <security@xen.org> wrote:
>>
>>       ----- Topal: Output generated on Tue Dec 22 12:23:44 GMT 2015 ----- Topal: GPG output starts ----- gpg:
>>       no valid OpenPGP data found. gpg: processing message failed: eof ----- Topal: GPG output ends -----
>>       ----- Topal: Original message starts ----- -----BEGIN PGP SIGNED MESSAGE-----
>>       Hash: SHA1
>>
>>                   Xen Security Advisory CVE-2015-8550 / XSA-155
>>                                     version 6
>>
>>           paravirtualized drivers incautious about shared memory contents
>>
>>       UPDATES IN VERSION 6
>>       ====================
>>
>>       Correct CREDITS section.
>>
>>       ISSUE DESCRIPTION
>>       =================
>>
>>       The compiler can emit optimizations in the PV backend drivers which
>>       can lead to double fetch vulnerabilities. Specifically the shared
>>       memory between the frontend and backend can be fetched twice (during
>>       which time the frontend can alter the contents) possibly leading to
>>       arbitrary code execution in backend.
>>
>>       IMPACT
>>       ======
>>
>>       Malicious guest administrators can cause denial of service.  If driver
>>       domains are not in use, the impact can be a host crash, or privilege escalation.
>>
>>       VULNERABLE SYSTEMS
>>       ==================
>>
>>       Systems running PV or HVM guests are vulnerable.
>>
>>       ARM and x86 systems are vulnerable.
>>
>>       All OSes providing PV backends are susceptible, this includes
>>       Linux and NetBSD. By default the Linux distributions compile kernels
>>       with optimizations.
>>
>>       MITIGATION
>>       ==========
>>
>>       There is no mitigation.
>>
>>       CREDITS
>>       =======
>>
>>       This issue was discovered by Felix Wilhelm (ERNW Research, KIT /
>>       Operating Systems Group).
>>
>>       RESOLUTION
>>       ==========
>>
>>       Applying the appropriate attached patches should fix the problem for
>>       PV backends.  Note only that PV backends are fixed; PV frontend
>>       patches will be developed and released (publicly) after the embargo
>>       date.
>>
>>       Please note that there is a bug in some versions of gcc,
>>       https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 which can cause the
>>       construct used in RING_COPY_REQUEST() to be ineffective in some
>>       circumstances. We have determined that this is only the case when the
>>       structure being copied consists purely of bitfields. The Xen PV
>>       protocols updated here do not use bitfields in this way and therefore
>>       these patches are not subject to that bug. However authors of third
>>       party PV protocols should take this into consideration.
>>
>>       Linux v4.4:
>>       xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
>>       xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
>>       xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
>>       xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
>>       Linux v4.[0,1,2,3]
>>       All the above patches except #5 will apply, please use:
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       Linux v3.19:
>>       All the above patches except #5 and #6 will apply, please use:
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       xsa155-linux319-0006-xen-scsiback-safely-copy-requests.patch
>>
>>       qemu-xen:
>>       xsa155-qemu-qdisk-double-access.patch
>>       xsa155-qemu-xenfb.patch
>>
>>       qemu-traditional:
>>       xsa155-qemut-qdisk-double-access.patch
>>       xsa155-qemut-xenfb.patch
>>
>>       NetBSD 7.0:
>>       xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
>>       xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
>>       xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
>>       xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>>
>>       xen:
>>       xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
>>       xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
>>       xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>>
>>       xen 4.4:
>>       All patches except #3 will apply, please use:
>>       xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>>
>>       $ sha256sum xsa155*
>>       d9fbc104ab2ae797971e351ee0e04e7b7e9c7c33385309bb406c7941dc9a33b4
>>       xsa155-linux319-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       590656d83ad7b6052b54659eccb3469658b3942c0dc1366423a66f2f5ac643e1
>>       xsa155-linux43-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       2bd18632178e09394c5cd06aded2c14bcc6b6e360ad6e81827d24860fe3e8ca4
>>       xsa155-linux-xsa155-0001-xen-Add-RING_COPY_REQUEST.patch
>>       cecdeccb8e2551252c81fc5f164a8298005df714a574a7ba18b84e8ed5f2bb70
>>       xsa155-linux-xsa155-0002-xen-netback-don-t-use-last-request-to-determine-mini.patch
>>       3916b847243047f0e1053233ade742c14a7f29243584e60bf5db4842a8068855
>>       xsa155-linux-xsa155-0003-xen-netback-use-RING_COPY_REQUEST-throughout.patch
>>       746c8eb0aeb200d76156c88dfbbd49db79f567b88b07eda70f7c7d095721f05a
>>       xsa155-linux-xsa155-0004-xen-blkback-only-read-request-operation-from-shared-.patch
>>       18517a184a02f7441065b8d3423086320ec4c2345c00d551231f7976381767f5
>>       xsa155-linux-xsa155-0005-xen-blkback-read-from-indirect-descriptors-only-once.patch
>>       2e6d556d25b1cc16e71afde665ae3908f4fa8eab7e0d96283fc78400301baf92
>>       xsa155-linux-xsa155-0006-xen-scsiback-safely-copy-requests.patch
>>       5e130d8b61906015c6a94f8edd3cce97b172f96a265d97ecf370e7b45125b73d
>>       xsa155-linux-xsa155-0007-xen-pciback-Save-xen_pci_op-commands-before-processi.patch
>>       08c2d0f95dcc215165afbce623b6972b81dd45b091b5f40017579b00c8612e03
>>       xsa155-netbsd-xsa155-0001-netbsd-xen-Add-RING_COPY_REQUEST.patch
>>       0a66010f736092f91f70bb0fd220685e4395efef1db6d23a3d1eace31d144f51
>>       xsa155-netbsd-xsa155-0002-netbsd-netback-Use-RING_COPY_REQUEST-instead-of-RING.patch
>>       5e913a8427cab6b4d384d1246e05116afc301eb117edd838101eb53a82c2f2ff
>>       xsa155-netbsd-xsa155-0003-netbsd-ring-Add-barrier-to-provide-an-compiler-barri.patch
>>       3b8f14eafaed3a7bc66245753a37af4249acf8129fbedb70653192252dc47dc9
>>       xsa155-netbsd-xsa155-0004-netbsd-block-only-read-request-operation-from-shared.patch
>>       81ae5fa998243a78dad749fc561be647dc1dc1be799e8f18484fdf0989469705
>>       xsa155-netbsd-xsa155-0005-netbsd-pciback-Operate-on-local-version-of-xen_pci_o.patch
>>       044ff74fa048df820d528f64f2791ec9cb3940bd313c1179020bd49a6cde2ca3  xsa155-qemu-qdisk-double-access.patch
>>       1150504589eb7bfa108c80ce63395e57d0e627b12d9201219d968fdd026919a6
>>       xsa155-qemut-qdisk-double-access.patch
>>       63186246ab6913b54bfef5f09f33e815935ac40ff821c27a3efda62339bbbd5f  xsa155-qemut-xenfb.patch
>>       e53b4ac298648cde79344192d5a58ca8d8724344f5105bec7c09eef095c668f6  xsa155-qemu-xenfb.patch
>>       e52467fcec73bcc86d3e96d06f8ca8085ae56a83d2c42a30c16bc3dc630d8f8a
>>       xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch
>>       eae34c8ccc096ad93a74190506b3d55020a88afb0cc504a3a514590e9fd746fd
>>       xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch
>>       42780265014085a4221ad32b026214693d751789eb5219e2e83862c0006c66f4
>>       xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch
>>       dfcaddb8a908a4fc1b048a43187e885117e67dc566f5c841037ee366dcd437d1
>>       xsa155-xen44-0003-libvchan-Read-prod-cons-only-once.patch
>>       $
>>
>>       DEPLOYMENT DURING EMBARGO
>>       =========================
>>
>>       Deployment of the patches and/or mitigations described above (or
>>       others which are substantially similar) is permitted during the
>>       embargo, even on public-facing systems with untrusted guest users and
>>       administrators.
>>
>>       But: Distribution of updated software is prohibited (except to other
>>       members of the predisclosure list).
>>
>>       Predisclosure list members who wish to deploy significantly different
>>       patches and/or mitigations, please contact the Xen Project Security
>>       Team.
>>
>>       (Note: this during-embargo deployment notice is retained in
>>       post-embargo publicly released Xen Project advisories, even though it
>>       is then no longer applicable.  This is to enable the community to have
>>       oversight of the Xen Project Security Team's decisionmaking.)
>>
>>       For more information about permissible uses of embargoed information,
>>       consult the Xen Project community's agreed Security Policy:
>>         http://www.xenproject.org/security-policy.html
>>       -----BEGIN PGP SIGNATURE-----
>>       Version: GnuPG v1.4.12 (GNU/Linux)
>>
>>       iQEcBAEBAgAGBQJWcrpdAAoJEIP+FMlX6CvZ9soIALqQ/GHP6bZn2LqJTD9DIzsm
>>       zVB4yCPiVfDqHSOq9QNCzBzqpvOX+RhKTzRH1jsZczr8CSnkePxaCrmZgH8SAygB
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>>       kjeD8auJEs+jK1iwpt/hOmYe4moRx3+3ujfgqMCNAWtqZz9D9wM5tao+p6yKYlhM
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>>       GwqPS19O77tMmz9fUUTyJDSsU7ayFRI0HyYmXju4eJktJkhXagjAdCSyGky9z5g=
>>       =FlX2
>>       -----END PGP SIGNATURE-----
>>
>> ----- Topal: Original message ends -----
>>

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