[Xen-devel] RE: [Xen-changelog] [xen-unstable] x86/hvm: don't pass through port 0x80 in a few special cases

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

> +__initcall(check_port80); 
Hi Jan,
Actually this is executed too late:

The global flag 'hvm_port80_allowed' is used in __start_xen() -> identify_cpu() 
-> init_intel() -> start_vmx() -> hvm_enable().

And later, in __start_xen() -> do_initcalls(0 -> check_port80(), 
hvm_port80_allowed could be set to 0.

Thanks,
-- Dexuan



-----Original Message-----
From: xen-changelog-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-changelog-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Xen 
patchbot-unstable
Sent: 2009?6?19? 15:56
To: xen-changelog@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-changelog] [xen-unstable] x86/hvm: don't pass through port 0x80 
in a few special cases

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1245156733 -3600
# Node ID cb6f8a34b59af59b08c016a64afaba5e71cec79c
# Parent  133c889c21a7596be60ab2a79d51b4ce9ded4521
x86/hvm: don't pass through port 0x80 in a few special cases

In a recent commit (99f85a28a78e96d28907fe036e1671a218fee597), KVM
disabled the passthrough of this port due to known problems on certain
HP laptops (see
http://lkml.indiana.edu/hypermail/linux/kernel/0712.3/0872.html
and http://lkml.indiana.edu/hypermail/linux/kernel/0801.0/2388.html).

For Xen, don't do this globally, but rather based on a DMI black list.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/arch/x86/hvm/Makefile |    1 
 xen/arch/x86/hvm/hvm.c    |    5 +-
 xen/arch/x86/hvm/quirks.c |   93 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+), 1 deletion(-)

diff -r 133c889c21a7 -r cb6f8a34b59a xen/arch/x86/hvm/Makefile
--- a/xen/arch/x86/hvm/Makefile Tue Jun 16 13:41:17 2009 +0100
+++ b/xen/arch/x86/hvm/Makefile Tue Jun 16 13:52:13 2009 +0100
@@ -9,6 +9,7 @@ obj-y += irq.o
 obj-y += irq.o
 obj-y += mtrr.o
 obj-y += pmtimer.o
+obj-y += quirks.o
 obj-y += rtc.o
 obj-y += hpet.o
 obj-y += vpt.o
diff -r 133c889c21a7 -r cb6f8a34b59a xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Tue Jun 16 13:41:17 2009 +0100
+++ b/xen/arch/x86/hvm/hvm.c    Tue Jun 16 13:52:13 2009 +0100
@@ -71,6 +71,8 @@ unsigned long __attribute__ ((__section_
 
 void hvm_enable(struct hvm_function_table *fns)
 {
+    extern int hvm_port80_allowed;
+
     BUG_ON(hvm_enabled);
     printk("HVM: %s enabled\n", fns->name);
 
@@ -79,7 +81,8 @@ void hvm_enable(struct hvm_function_tabl
      * often used for I/O delays, but the vmexits simply slow things down).
      */
     memset(hvm_io_bitmap, ~0, sizeof(hvm_io_bitmap));
-    __clear_bit(0x80, hvm_io_bitmap);
+    if ( hvm_port80_allowed )
+        __clear_bit(0x80, hvm_io_bitmap);
     __clear_bit(0xed, hvm_io_bitmap);
 
     hvm_funcs   = *fns;
diff -r 133c889c21a7 -r cb6f8a34b59a xen/arch/x86/hvm/quirks.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/x86/hvm/quirks.c Tue Jun 16 13:52:13 2009 +0100
@@ -0,0 +1,93 @@
+/******************************************************************************
+ * x86/hvm/quirks.c
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <xen/config.h>
+#include <xen/types.h>
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/dmi.h>
+
+int hvm_port80_allowed = -1;
+boolean_param("hvm_port80", hvm_port80_allowed);
+
+static int __init dmi_hvm_deny_port80(/*const*/ struct dmi_system_id *id)
+{
+    printk(XENLOG_WARNING "%s: port 0x80 access %s allowed for HVM guests\n",
+           id->ident, hvm_port80_allowed > 0 ? "forcibly" : "not");
+
+    if ( hvm_port80_allowed < 0 )
+        hvm_port80_allowed = 0;
+
+    return 0;
+}
+
+static int __init check_port80(void)
+{
+    /*
+     * Quirk table for systems that misbehave (lock up, etc.) if port
+     * 0x80 is used:
+     */
+    static struct dmi_system_id __initdata hvm_no_port80_dmi_table[] =
+    {
+        {
+            .callback = dmi_hvm_deny_port80,
+            .ident    = "Compaq Presario V6000",
+            .matches  = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+                DMI_MATCH(DMI_BOARD_NAME,   "30B7")
+            }
+        },
+        {
+            .callback = dmi_hvm_deny_port80,
+            .ident    = "HP Pavilion dv9000z",
+            .matches  = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+                DMI_MATCH(DMI_BOARD_NAME,   "30B9")
+            }
+        },
+        {
+            .callback = dmi_hvm_deny_port80,
+            .ident    = "HP Pavilion dv6000",
+            .matches  = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+                DMI_MATCH(DMI_BOARD_NAME,   "30B8")
+            }
+        },
+        {
+            .callback = dmi_hvm_deny_port80,
+            .ident    = "HP Pavilion tx1000",
+            .matches  = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+                DMI_MATCH(DMI_BOARD_NAME,   "30BF")
+            }
+        },
+        {
+            .callback = dmi_hvm_deny_port80,
+            .ident    = "Presario F700",
+            .matches  = {
+                DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+                DMI_MATCH(DMI_BOARD_NAME,   "30D3")
+            }
+        },
+        { }
+    };
+
+    dmi_check_system(hvm_no_port80_dmi_table);
+
+    return 0;
+}
+__initcall(check_port80);

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