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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V8 07/12] xen: Introduce monitor_op domctl
In preparation for allowing for introspecting ARM and PV domains the old
control interface via the hvm_op hypercall is retired. A new control mechanism
is introduced via the domctl hypercall: monitor_op.
This patch aims to establish a base API on which future applications can build
on.
Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
---
v8: Style fixes, comment expansion and forward declaration of structs
in monitor.h instead of including entire headers
v7: Convert monitor control fields to a bitfield in Xen
Fix XSM checks in monitor_domctl
v6: Convert monitor control fields to bool_t both in Xen and in libxc
Make monitor_domctl more compact by abstracting common patterns
Deprecated HVM params remain but throw error both in Xen and in libxc
Style fixes
Add another field to arch.domain that determines if mem_access emulation
is enabled and corresponding mem_access memops to enable/disable it
Add XSM check to monitor_domctl
v5: p2m_vm_event_sanity_check is moved into the monitor_op handler
v4: Style fixes
Only defining struct mov_to_cr and struct debug_event in asm-x86/domain.h
Add pause/unpause domain wrapper when enabled a monitor option.
---
MAINTAINERS | 1 +
tools/libxc/Makefile | 1 +
tools/libxc/include/xenctrl.h | 27 +++++
tools/libxc/xc_domain.c | 28 +++++-
tools/libxc/xc_mem_access.c | 33 ++++--
tools/libxc/xc_monitor.c | 115 +++++++++++++++++++++
tools/libxc/xc_private.h | 2 +-
tools/libxc/xc_vm_event.c | 7 +-
tools/tests/xen-access/xen-access.c | 30 +++---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/hvm/emulate.c | 2 +-
xen/arch/x86/hvm/event.c | 82 ++++++++-------
xen/arch/x86/hvm/hvm.c | 35 +------
xen/arch/x86/hvm/vmx/vmcs.c | 7 +-
xen/arch/x86/hvm/vmx/vmx.c | 2 +-
xen/arch/x86/mm/p2m.c | 9 --
xen/arch/x86/monitor.c | 195 ++++++++++++++++++++++++++++++++++++
xen/common/domctl.c | 9 ++
xen/common/mem_access.c | 8 ++
xen/common/vm_event.c | 33 +-----
xen/include/asm-arm/monitor.h | 35 +++++++
xen/include/asm-arm/p2m.h | 18 +++-
xen/include/asm-x86/domain.h | 22 +++-
xen/include/asm-x86/hvm/domain.h | 1 -
xen/include/asm-x86/monitor.h | 31 ++++++
xen/include/asm-x86/p2m.h | 35 +++++--
xen/include/public/domctl.h | 48 ++++++++-
xen/include/public/hvm/params.h | 9 +-
xen/include/public/memory.h | 2 +
xen/include/public/vm_event.h | 2 +-
xen/xsm/flask/hooks.c | 3 +
xen/xsm/flask/policy/access_vectors | 2 +
32 files changed, 668 insertions(+), 167 deletions(-)
create mode 100644 tools/libxc/xc_monitor.c
create mode 100644 xen/arch/x86/monitor.c
create mode 100644 xen/include/asm-arm/monitor.h
create mode 100644 xen/include/asm-x86/monitor.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 13eaf50..f28b1cd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -379,6 +379,7 @@ S: Supported
F: xen/common/vm_event.c
F: xen/common/mem_access.c
F: xen/arch/x86/hvm/event.c
+F: xen/arch/x86/monitor.c
XENTRACE
M: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 22ba2a1..8b609cf 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -32,6 +32,7 @@ CTRL_SRCS-y += xc_cpu_hotplug.c
CTRL_SRCS-y += xc_resume.c
CTRL_SRCS-y += xc_tmem.c
CTRL_SRCS-y += xc_vm_event.c
+CTRL_SRCS-y += xc_monitor.c
CTRL_SRCS-y += xc_mem_paging.c
CTRL_SRCS-y += xc_mem_access.c
CTRL_SRCS-y += xc_memshr.c
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 9aeb82e..5ac274f 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -34,6 +34,7 @@
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
+#include <stdbool.h>
#include <xen/xen.h>
#include <xen/domctl.h>
#include <xen/physdev.h>
@@ -2307,6 +2308,32 @@ int xc_set_mem_access(xc_interface *xch, domid_t
domain_id,
int xc_get_mem_access(xc_interface *xch, domid_t domain_id,
uint64_t pfn, xenmem_access_t *access);
+/*
+ * Instructions causing a mem_access violation can be emulated by Xen
+ * to progress the execution without having to relax the mem_access
+ * permissions.
+ * This feature has to be first enabled, then in the vm_event
+ * response to a mem_access event it can be indicated if the instruction
+ * should be emulated.
+ */
+int xc_mem_access_enable_emulate(xc_interface *xch, domid_t domain_id);
+int xc_mem_access_disable_emulate(xc_interface *xch, domid_t domain_id);
+
+/***
+ * Monitor control operations.
+ */
+int xc_monitor_mov_to_cr0(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly);
+int xc_monitor_mov_to_cr3(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly);
+int xc_monitor_mov_to_cr4(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly);
+int xc_monitor_mov_to_msr(xc_interface *xch, domid_t domain_id, bool enable,
+ bool extended_capture);
+int xc_monitor_singlestep(xc_interface *xch, domid_t domain_id, bool enable);
+int xc_monitor_software_breakpoint(xc_interface *xch, domid_t domain_id,
+ bool enable);
+
/***
* Memory sharing operations.
*
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 845d1d7..5adb685 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1291,11 +1291,32 @@ int xc_domain_send_trigger(xc_interface *xch,
return do_domctl(xch, &domctl);
}
+static inline int xc_hvm_param_deprecated_check(uint32_t param)
+{
+ switch ( param )
+ {
+ case HVM_PARAM_MEMORY_EVENT_CR0:
+ case HVM_PARAM_MEMORY_EVENT_CR3:
+ case HVM_PARAM_MEMORY_EVENT_CR4:
+ case HVM_PARAM_MEMORY_EVENT_INT3:
+ case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
+ case HVM_PARAM_MEMORY_EVENT_MSR:
+ return -EOPNOTSUPP;
+ default:
+ break;
+ };
+
+ return 0;
+}
+
int xc_hvm_param_set(xc_interface *handle, domid_t dom, uint32_t param,
uint64_t value)
{
DECLARE_HYPERCALL;
DECLARE_HYPERCALL_BUFFER(xen_hvm_param_t, arg);
- int rc;
+ int rc = xc_hvm_param_deprecated_check(param);
+
+ if ( rc )
+ return rc;
arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
if ( arg == NULL )
@@ -1316,7 +1337,10 @@ int xc_hvm_param_get(xc_interface *handle, domid_t dom,
uint32_t param, uint64_t
{
DECLARE_HYPERCALL;
DECLARE_HYPERCALL_BUFFER(xen_hvm_param_t, arg);
- int rc;
+ int rc = xc_hvm_param_deprecated_check(param);
+
+ if ( rc )
+ return rc;
arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
if ( arg == NULL )
diff --git a/tools/libxc/xc_mem_access.c b/tools/libxc/xc_mem_access.c
index 0a3f0e6..f27bc44 100644
--- a/tools/libxc/xc_mem_access.c
+++ b/tools/libxc/xc_mem_access.c
@@ -27,14 +27,7 @@
void *xc_mem_access_enable(xc_interface *xch, domid_t domain_id, uint32_t
*port)
{
return xc_vm_event_enable(xch, domain_id, HVM_PARAM_MONITOR_RING_PFN,
- port, 0);
-}
-
-void *xc_mem_access_enable_introspection(xc_interface *xch, domid_t domain_id,
- uint32_t *port)
-{
- return xc_vm_event_enable(xch, domain_id, HVM_PARAM_MONITOR_RING_PFN,
- port, 1);
+ port);
}
int xc_mem_access_disable(xc_interface *xch, domid_t domain_id)
@@ -95,6 +88,30 @@ int xc_get_mem_access(xc_interface *xch,
return rc;
}
+int xc_mem_access_enable_emulate(xc_interface *xch,
+ domid_t domain_id)
+{
+ xen_mem_access_op_t mao =
+ {
+ .op = XENMEM_access_op_enable_emulate,
+ .domid = domain_id,
+ };
+
+ return do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
+}
+
+int xc_mem_access_disable_emulate(xc_interface *xch,
+ domid_t domain_id)
+{
+ xen_mem_access_op_t mao =
+ {
+ .op = XENMEM_access_op_disable_emulate,
+ .domid = domain_id,
+ };
+
+ return do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libxc/xc_monitor.c b/tools/libxc/xc_monitor.c
new file mode 100644
index 0000000..fe090bc
--- /dev/null
+++ b/tools/libxc/xc_monitor.c
@@ -0,0 +1,115 @@
+/******************************************************************************
+ *
+ * xc_monitor.c
+ *
+ * Interface to VM event monitor
+ *
+ * Copyright (c) 2015 Tamas K Lengyel (tamas@xxxxxxxxxxxxx)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
+ */
+
+#include "xc_private.h"
+
+int xc_monitor_mov_to_cr0(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR0;
+ domctl.u.monitor_op.u.mov_to_cr.sync = sync;
+ domctl.u.monitor_op.u.mov_to_cr.onchangeonly = onchangeonly;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_monitor_mov_to_cr3(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR3;
+ domctl.u.monitor_op.u.mov_to_cr.sync = sync;
+ domctl.u.monitor_op.u.mov_to_cr.onchangeonly = onchangeonly;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_monitor_mov_to_cr4(xc_interface *xch, domid_t domain_id, bool enable,
+ bool sync, bool onchangeonly)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR4;
+ domctl.u.monitor_op.u.mov_to_cr.sync = sync;
+ domctl.u.monitor_op.u.mov_to_cr.onchangeonly = onchangeonly;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_monitor_mov_to_msr(xc_interface *xch, domid_t domain_id, bool enable,
+ bool extended_capture)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR;
+ domctl.u.monitor_op.u.mov_to_msr.extended_capture = extended_capture;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_monitor_software_breakpoint(xc_interface *xch, domid_t domain_id,
+ bool enable)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_monitor_singlestep(xc_interface *xch, domid_t domain_id,
+ bool enable)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_monitor_op;
+ domctl.domain = domain_id;
+ domctl.u.monitor_op.op = enable ? XEN_DOMCTL_MONITOR_OP_ENABLE
+ : XEN_DOMCTL_MONITOR_OP_DISABLE;
+ domctl.u.monitor_op.event = XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP;
+
+ return do_domctl(xch, &domctl);
+}
diff --git a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h
index 843540c..9f55309 100644
--- a/tools/libxc/xc_private.h
+++ b/tools/libxc/xc_private.h
@@ -430,6 +430,6 @@ int xc_vm_event_control(xc_interface *xch, domid_t
domain_id, unsigned int op,
* param can be HVM_PARAM_PAGING/ACCESS/SHARING_RING_PFN
*/
void *xc_vm_event_enable(xc_interface *xch, domid_t domain_id, int param,
- uint32_t *port, int enable_introspection);
+ uint32_t *port);
#endif /* __XC_PRIVATE_H__ */
diff --git a/tools/libxc/xc_vm_event.c b/tools/libxc/xc_vm_event.c
index d458b9a..7277e86 100644
--- a/tools/libxc/xc_vm_event.c
+++ b/tools/libxc/xc_vm_event.c
@@ -41,7 +41,7 @@ int xc_vm_event_control(xc_interface *xch, domid_t domain_id,
unsigned int op,
}
void *xc_vm_event_enable(xc_interface *xch, domid_t domain_id, int param,
- uint32_t *port, int enable_introspection)
+ uint32_t *port)
{
void *ring_page = NULL;
uint64_t pfn;
@@ -104,10 +104,7 @@ void *xc_vm_event_enable(xc_interface *xch, domid_t
domain_id, int param,
break;
case HVM_PARAM_MONITOR_RING_PFN:
- if ( enable_introspection )
- op = XEN_VM_EVENT_MONITOR_ENABLE_INTROSPECTION;
- else
- op = XEN_VM_EVENT_MONITOR_ENABLE;
+ op = XEN_VM_EVENT_MONITOR_ENABLE;
mode = XEN_DOMCTL_VM_EVENT_OP_MONITOR;
break;
diff --git a/tools/tests/xen-access/xen-access.c
b/tools/tests/xen-access/xen-access.c
index d667bf5..23438fc 100644
--- a/tools/tests/xen-access/xen-access.c
+++ b/tools/tests/xen-access/xen-access.c
@@ -317,9 +317,9 @@ static void put_response(vm_event_t *vm_event,
vm_event_response_t *rsp)
void usage(char* progname)
{
fprintf(stderr,
- "Usage: %s [-m] <domain_id> write|exec|int3\n"
+ "Usage: %s [-m] <domain_id> write|exec|breakpoint\n"
"\n"
- "Logs first page writes, execs, or int3 traps that occur on the
domain.\n"
+ "Logs first page writes, execs, or breakpoint traps that occur on
the domain.\n"
"\n"
"-m requires this program to run, or else the domain may pause\n",
progname);
@@ -338,7 +338,7 @@ int main(int argc, char *argv[])
xenmem_access_t default_access = XENMEM_access_rwx;
xenmem_access_t after_first_access = XENMEM_access_rwx;
int required = 0;
- int int3 = 0;
+ int breakpoint = 0;
int shutting_down = 0;
char* progname = argv[0];
@@ -378,9 +378,9 @@ int main(int argc, char *argv[])
default_access = XENMEM_access_rw;
after_first_access = XENMEM_access_rwx;
}
- else if ( !strcmp(argv[0], "int3") )
+ else if ( !strcmp(argv[0], "breakpoint") )
{
- int3 = 1;
+ breakpoint = 1;
}
else
{
@@ -431,14 +431,14 @@ int main(int argc, char *argv[])
goto exit;
}
- if ( int3 )
- rc = xc_hvm_param_set(xch, domain_id, HVM_PARAM_MEMORY_EVENT_INT3,
HVMPME_mode_sync);
- else
- rc = xc_hvm_param_set(xch, domain_id, HVM_PARAM_MEMORY_EVENT_INT3,
HVMPME_mode_disabled);
- if ( rc < 0 )
+ if ( breakpoint )
{
- ERROR("Error %d setting int3 vm_event\n", rc);
- goto exit;
+ rc = xc_monitor_software_breakpoint(xch, domain_id, 1);
+ if ( rc < 0 )
+ {
+ ERROR("Error %d setting breakpoint trapping with vm_event\n", rc);
+ goto exit;
+ }
}
/* Wait for access */
@@ -452,7 +452,7 @@ int main(int argc, char *argv[])
rc = xc_set_mem_access(xch, domain_id, XENMEM_access_rwx, ~0ull,
0);
rc = xc_set_mem_access(xch, domain_id, XENMEM_access_rwx, 0,
xenaccess->domain_info->max_pages);
- rc = xc_hvm_param_set(xch, domain_id, HVM_PARAM_MEMORY_EVENT_INT3,
HVMPME_mode_disabled);
+ rc = xc_monitor_software_breakpoint(xch, domain_id, 0);
shutting_down = 1;
}
@@ -527,7 +527,7 @@ int main(int argc, char *argv[])
rsp.u.mem_access.gfn = req.u.mem_access.gfn;
break;
case VM_EVENT_REASON_SOFTWARE_BREAKPOINT:
- printf("INT3: rip=%016"PRIx64", gfn=%"PRIx64" (vcpu %d)\n",
+ printf("Breakpoint: rip=%016"PRIx64", gfn=%"PRIx64" (vcpu
%d)\n",
req.regs.x86.rip,
req.u.software_breakpoint.gfn,
req.vcpu_id);
@@ -538,7 +538,7 @@ int main(int argc, char *argv[])
HVMOP_TRAP_sw_exc, -1, 0, 0);
if (rc < 0)
{
- ERROR("Error %d injecting int3\n", rc);
+ ERROR("Error %d injecting breakpoint\n", rc);
interrupted = -1;
continue;
}
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 86ca5f8..37e547c 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -36,6 +36,7 @@ obj-y += microcode_intel.o
# This must come after the vendor specific files.
obj-y += microcode.o
obj-y += mm.o
+obj-y += monitor.o
obj-y += mpparse.o
obj-y += nmi.o
obj-y += numa.o
diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 40de776..ac9c9d6 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -418,7 +418,7 @@ static int hvmemul_virtual_to_linear(
* being triggered for repeated writes to a whole page.
*/
*reps = min_t(unsigned long, *reps,
-
unlikely(current->domain->arch.hvm_domain.introspection_enabled)
+ unlikely(current->domain->arch.mem_access_emulate_enabled)
? 1 : 4096);
reg = hvmemul_get_seg_reg(seg, hvmemul_ctxt);
diff --git a/xen/arch/x86/hvm/event.c b/xen/arch/x86/hvm/event.c
index dfb0ab7..9d5f9f3 100644
--- a/xen/arch/x86/hvm/event.c
+++ b/xen/arch/x86/hvm/event.c
@@ -55,15 +55,12 @@ static void hvm_event_fill_regs(vm_event_request_t *req)
req->regs.x86.cr4 = curr->arch.hvm_vcpu.guest_cr[4];
}
-static int hvm_event_traps(uint64_t parameters, vm_event_request_t *req)
+static int hvm_event_traps(uint8_t sync, vm_event_request_t *req)
{
int rc;
struct vcpu *curr = current;
struct domain *currd = curr->domain;
- if ( !(parameters & HVMPME_MODE_MASK) )
- return 0;
-
rc = vm_event_claim_slot(currd, &currd->vm_event->monitor);
switch ( rc )
{
@@ -79,7 +76,7 @@ static int hvm_event_traps(uint64_t parameters,
vm_event_request_t *req)
return rc;
};
- if ( (parameters & HVMPME_MODE_MASK) == HVMPME_mode_sync )
+ if ( sync )
{
req->flags |= VM_EVENT_FLAG_VCPU_PAUSED;
vm_event_vcpu_pause(curr);
@@ -91,41 +88,53 @@ static int hvm_event_traps(uint64_t parameters,
vm_event_request_t *req)
return 1;
}
-static void hvm_event_cr(uint32_t reason, unsigned long value,
- unsigned long old, uint64_t parameters)
+static inline
+void hvm_event_cr(uint32_t reason, unsigned long value,
+ unsigned long old, bool_t onchangeonly, bool_t sync)
{
- vm_event_request_t req = {
- .reason = reason,
- .vcpu_id = current->vcpu_id,
- .u.mov_to_cr.new_value = value,
- .u.mov_to_cr.old_value = old
- };
-
- if ( (parameters & HVMPME_onchangeonly) && (value == old) )
+ if ( onchangeonly && value == old )
return;
-
- hvm_event_traps(parameters, &req);
+ else
+ {
+ vm_event_request_t req = {
+ .reason = reason,
+ .vcpu_id = current->vcpu_id,
+ .u.mov_to_cr.new_value = value,
+ .u.mov_to_cr.old_value = old
+ };
+
+ hvm_event_traps(sync, &req);
+ }
}
void hvm_event_cr0(unsigned long value, unsigned long old)
{
- hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR0, value, old,
- current->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_CR0]);
+ struct arch_domain *currad = ¤t->domain->arch;
+
+ if ( currad->monitor.mov_to_cr0_enabled )
+ hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR0, value, old,
+ currad->monitor.mov_to_cr0_onchangeonly,
+ currad->monitor.mov_to_cr0_sync);
}
void hvm_event_cr3(unsigned long value, unsigned long old)
{
- hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR3, value, old,
- current->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_CR3]);
+ struct arch_domain *currad = ¤t->domain->arch;
+
+ if ( currad->monitor.mov_to_cr3_enabled )
+ hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR3, value, old,
+ currad->monitor.mov_to_cr3_onchangeonly,
+ currad->monitor.mov_to_cr3_sync);
}
void hvm_event_cr4(unsigned long value, unsigned long old)
{
- hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR4, value, old,
- current->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_CR4]);
+ struct arch_domain *currad = ¤t->domain->arch;
+
+ if ( currad->monitor.mov_to_cr4_enabled )
+ hvm_event_cr(VM_EVENT_REASON_MOV_TO_CR4, value, old,
+ currad->monitor.mov_to_cr4_onchangeonly,
+ currad->monitor.mov_to_cr4_sync);
}
void hvm_event_msr(unsigned int msr, uint64_t value)
@@ -137,14 +146,14 @@ void hvm_event_msr(unsigned int msr, uint64_t value)
.u.mov_to_msr.msr = msr,
.u.mov_to_msr.value = value,
};
- uint64_t params = curr->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_MSR];
- hvm_event_traps(params, &req);
+ if ( curr->domain->arch.monitor.mov_to_msr_enabled )
+ hvm_event_traps(1, &req);
}
int hvm_event_int3(unsigned long gla)
{
+ int rc = 0;
uint32_t pfec = PFEC_page_present;
struct vcpu *curr = current;
vm_event_request_t req = {
@@ -152,14 +161,16 @@ int hvm_event_int3(unsigned long gla)
.vcpu_id = curr->vcpu_id,
.u.software_breakpoint.gfn = paging_gva_to_gfn(curr, gla, &pfec)
};
- uint64_t params = curr->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_INT3];
- return hvm_event_traps(params, &req);
+ if ( curr->domain->arch.monitor.software_breakpoint_enabled )
+ rc = hvm_event_traps(1, &req);
+
+ return rc;
}
int hvm_event_single_step(unsigned long gla)
{
+ int rc = 0;
uint32_t pfec = PFEC_page_present;
struct vcpu *curr = current;
vm_event_request_t req = {
@@ -167,10 +178,11 @@ int hvm_event_single_step(unsigned long gla)
.vcpu_id = curr->vcpu_id,
.u.singlestep.gfn = paging_gva_to_gfn(curr, gla, &pfec)
};
- uint64_t params = curr->domain->arch.hvm_domain
- .params[HVM_PARAM_MEMORY_EVENT_SINGLE_STEP];
- return hvm_event_traps(params, &req);
+ if ( curr->domain->arch.monitor.singlestep_enabled )
+ rc = hvm_event_traps(1, &req);
+
+ return rc;
}
/*
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 2c16aaf..5ae9a68 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -5830,19 +5830,11 @@ long do_hvm_op(unsigned long op,
XEN_GUEST_HANDLE_PARAM(void) arg)
case HVM_PARAM_MEMORY_EVENT_CR0:
case HVM_PARAM_MEMORY_EVENT_CR3:
case HVM_PARAM_MEMORY_EVENT_CR4:
- if ( d == current->domain )
- rc = -EPERM;
- break;
case HVM_PARAM_MEMORY_EVENT_INT3:
case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
case HVM_PARAM_MEMORY_EVENT_MSR:
- if ( d == current->domain )
- {
- rc = -EPERM;
- break;
- }
- if ( a.value & HVMPME_onchangeonly )
- rc = -EINVAL;
+ /* Deprecated */
+ rc = -EOPNOTSUPP;
break;
case HVM_PARAM_NESTEDHVM:
rc = xsm_hvm_param_nested(XSM_PRIV, d);
@@ -5902,29 +5894,8 @@ long do_hvm_op(unsigned long op,
XEN_GUEST_HANDLE_PARAM(void) arg)
}
}
- if ( rc == 0 )
- {
+ if ( rc == 0 )
d->arch.hvm_domain.params[a.index] = a.value;
-
- switch( a.index )
- {
- case HVM_PARAM_MEMORY_EVENT_INT3:
- case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
- {
- domain_pause(d);
- domain_unpause(d); /* Causes guest to latch new status */
- break;
- }
- case HVM_PARAM_MEMORY_EVENT_CR3:
- {
- for_each_vcpu ( d, v )
- hvm_funcs.update_guest_cr(v, 0); /* Latches new CR3
mask through CR0 code */
- break;
- }
- }
-
- }
-
}
else
{
diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 63007a9..8b98a9f 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -714,7 +714,8 @@ void vmx_disable_intercept_for_msr(struct vcpu *v, u32 msr,
int type)
if ( msr_bitmap == NULL )
return;
- if ( unlikely(d->arch.hvm_domain.introspection_enabled) &&
+ if ( unlikely(d->arch.monitor.mov_to_msr_enabled &&
+ d->arch.monitor.mov_to_msr_extended) &&
vm_event_check_ring(&d->vm_event->monitor) )
{
unsigned int i;
@@ -1373,8 +1374,8 @@ void vmx_do_resume(struct vcpu *v)
}
debug_state = v->domain->debugger_attached
- ||
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_INT3]
- ||
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_SINGLE_STEP];
+ || v->domain->arch.monitor.software_breakpoint_enabled
+ || v->domain->arch.monitor.singlestep_enabled;
if ( unlikely(v->arch.hvm_vcpu.debug_state_latch != debug_state) )
{
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 23aa768..95b16de 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1232,7 +1232,7 @@ static void vmx_update_guest_cr(struct vcpu *v, unsigned
int cr)
v->arch.hvm_vmx.exec_control |= cr3_ctls;
/* Trap CR3 updates if CR3 memory events are enabled. */
- if ( v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_CR3]
)
+ if ( v->domain->arch.monitor.mov_to_cr3_enabled )
v->arch.hvm_vmx.exec_control |= CPU_BASED_CR3_LOAD_EXITING;
vmx_update_cpu_exec_control(v);
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index df4a485..1d3356a 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1454,15 +1454,6 @@ void p2m_mem_access_emulate_check(struct vcpu *v,
}
}
-void p2m_setup_introspection(struct domain *d)
-{
- if ( hvm_funcs.enable_msr_exit_interception )
- {
- d->arch.hvm_domain.introspection_enabled = 1;
- hvm_funcs.enable_msr_exit_interception(d);
- }
-}
-
bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla,
struct npfec npfec,
vm_event_request_t **req_ptr)
diff --git a/xen/arch/x86/monitor.c b/xen/arch/x86/monitor.c
new file mode 100644
index 0000000..d8e21cb
--- /dev/null
+++ b/xen/arch/x86/monitor.c
@@ -0,0 +1,195 @@
+/*
+ * arch/x86/monitor.c
+ *
+ * Architecture-specific monitor_op domctl handler.
+ *
+ * Copyright (c) 2015 Tamas K Lengyel (tamas@xxxxxxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 021110-1307, USA.
+ */
+
+#include <xen/config.h>
+#include <xen/sched.h>
+#include <xen/mm.h>
+#include <asm/domain.h>
+#include <asm/monitor.h>
+#include <public/domctl.h>
+#include <xsm/xsm.h>
+
+/*
+ * Sanity check whether option is already enabled/disabled
+ */
+static inline
+int status_check(struct xen_domctl_monitor_op *mop, bool_t status)
+{
+ bool_t requested_status = (mop->op == XEN_DOMCTL_MONITOR_OP_ENABLE);
+
+ if ( status == requested_status )
+ return -EEXIST;
+
+ return 0;
+}
+
+int monitor_domctl(struct domain *d, struct xen_domctl_monitor_op *mop)
+{
+ int rc;
+ struct arch_domain *ad = &d->arch;
+
+ rc = xsm_vm_event_control(XSM_PRIV, d, mop->op, mop->event);
+ if ( rc )
+ return rc;
+
+ /*
+ * At the moment only Intel HVM domains are supported. However, event
+ * delivery could be extended to AMD and PV domains.
+ */
+ if ( !is_hvm_domain(d) || !cpu_has_vmx )
+ return -EOPNOTSUPP;
+
+ /*
+ * Sanity check
+ */
+ if ( mop->op != XEN_DOMCTL_MONITOR_OP_ENABLE &&
+ mop->op != XEN_DOMCTL_MONITOR_OP_DISABLE )
+ return -EOPNOTSUPP;
+
+ switch ( mop->event )
+ {
+ case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR0:
+ {
+ bool_t status = ad->monitor.mov_to_cr0_enabled;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ ad->monitor.mov_to_cr0_sync = mop->u.mov_to_cr.sync;
+ ad->monitor.mov_to_cr0_onchangeonly = mop->u.mov_to_cr.onchangeonly;
+
+ domain_pause(d);
+ ad->monitor.mov_to_cr0_enabled = !status;
+ domain_unpause(d);
+ break;
+ }
+
+ case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR3:
+ {
+ bool_t status = ad->monitor.mov_to_cr3_enabled;
+ struct vcpu *v;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ ad->monitor.mov_to_cr3_sync = mop->u.mov_to_cr.sync;
+ ad->monitor.mov_to_cr3_onchangeonly = mop->u.mov_to_cr.onchangeonly;
+
+ domain_pause(d);
+ ad->monitor.mov_to_cr3_enabled = !status;
+ domain_unpause(d);
+
+ /* Latches new CR3 mask through CR0 code */
+ for_each_vcpu ( d, v )
+ hvm_funcs.update_guest_cr(v, 0);
+ break;
+ }
+
+ case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR4:
+ {
+ bool_t status = ad->monitor.mov_to_cr4_enabled;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ ad->monitor.mov_to_cr4_sync = mop->u.mov_to_cr.sync;
+ ad->monitor.mov_to_cr4_onchangeonly = mop->u.mov_to_cr.onchangeonly;
+
+ domain_pause(d);
+ ad->monitor.mov_to_cr4_enabled = !ad->monitor.mov_to_cr4_enabled;
+ domain_unpause(d);
+ break;
+ }
+
+ case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR:
+ {
+ bool_t status = ad->monitor.mov_to_msr_enabled;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ if ( mop->op == XEN_DOMCTL_MONITOR_OP_ENABLE &&
+ mop->u.mov_to_msr.extended_capture )
+ {
+ if ( hvm_funcs.enable_msr_exit_interception )
+ {
+ ad->monitor.mov_to_msr_extended = 1;
+ hvm_funcs.enable_msr_exit_interception(d);
+ }
+ else
+ return -EOPNOTSUPP;
+ }
+
+ domain_pause(d);
+ ad->monitor.mov_to_msr_enabled = !status;
+ domain_unpause(d);
+ break;
+ }
+
+ case XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP:
+ {
+ bool_t status = ad->monitor.singlestep_enabled;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ domain_pause(d);
+ ad->monitor.singlestep_enabled = !status;
+ domain_unpause(d);
+ break;
+ }
+
+ case XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT:
+ {
+ bool_t status = ad->monitor.software_breakpoint_enabled;
+
+ rc = status_check(mop, status);
+ if ( rc )
+ return rc;
+
+ domain_pause(d);
+ ad->monitor.software_breakpoint_enabled = !status;
+ domain_unpause(d);
+ break;
+ }
+
+ default:
+ return -EOPNOTSUPP;
+
+ };
+
+ return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 8affea0..c703c50 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -29,6 +29,7 @@
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/p2m.h>
+#include <asm/monitor.h>
#include <public/domctl.h>
#include <xsm/xsm.h>
@@ -1150,6 +1151,14 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
break;
}
+ case XEN_DOMCTL_monitor_op:
+ ret = -EPERM;
+ if ( current->domain == d )
+ break;
+
+ ret = monitor_domctl(d, &op->u.monitor_op);
+ break;
+
default:
ret = arch_do_domctl(op, d, u_domctl);
break;
diff --git a/xen/common/mem_access.c b/xen/common/mem_access.c
index 4bbe2f9..f925ac7 100644
--- a/xen/common/mem_access.c
+++ b/xen/common/mem_access.c
@@ -140,6 +140,14 @@ int mem_access_memop(unsigned long cmd,
break;
}
+ case XENMEM_access_op_enable_emulate:
+ rc = p2m_mem_access_enable_emulate(d);
+ break;
+
+ case XENMEM_access_op_disable_emulate:
+ rc = p2m_mem_access_disable_emulate(d);
+ break;
+
default:
rc = -ENOSYS;
break;
diff --git a/xen/common/vm_event.c b/xen/common/vm_event.c
index 9afb54f..7c532fc 100644
--- a/xen/common/vm_event.c
+++ b/xen/common/vm_event.c
@@ -599,11 +599,9 @@ int vm_event_domctl(struct domain *d,
xen_domctl_vm_event_op_t *vec,
break;
case XEN_VM_EVENT_PAGING_DISABLE:
- {
if ( ved->ring_page )
rc = vm_event_disable(d, ved);
- }
- break;
+ break;
default:
rc = -ENOSYS;
@@ -622,32 +620,15 @@ int vm_event_domctl(struct domain *d,
xen_domctl_vm_event_op_t *vec,
switch( vec->op )
{
case XEN_VM_EVENT_MONITOR_ENABLE:
- case XEN_VM_EVENT_MONITOR_ENABLE_INTROSPECTION:
- {
- rc = -ENODEV;
- if ( !p2m_vm_event_sanity_check(d) )
- break;
-
rc = vm_event_enable(d, vec, ved, _VPF_mem_access,
HVM_PARAM_MONITOR_RING_PFN,
mem_access_notification);
-
- if ( vec->op == XEN_VM_EVENT_MONITOR_ENABLE_INTROSPECTION
- && !rc )
- p2m_setup_introspection(d);
-
- }
- break;
+ break;
case XEN_VM_EVENT_MONITOR_DISABLE:
- {
if ( ved->ring_page )
- {
rc = vm_event_disable(d, ved);
- d->arch.hvm_domain.introspection_enabled = 0;
- }
- }
- break;
+ break;
default:
rc = -ENOSYS;
@@ -666,7 +647,6 @@ int vm_event_domctl(struct domain *d,
xen_domctl_vm_event_op_t *vec,
switch( vec->op )
{
case XEN_VM_EVENT_SHARING_ENABLE:
- {
rc = -EOPNOTSUPP;
/* pvh fixme: p2m_is_foreign types need addressing */
if ( is_pvh_vcpu(current) || is_pvh_domain(hardware_domain) )
@@ -680,15 +660,12 @@ int vm_event_domctl(struct domain *d,
xen_domctl_vm_event_op_t *vec,
rc = vm_event_enable(d, vec, ved, _VPF_mem_sharing,
HVM_PARAM_SHARING_RING_PFN,
mem_sharing_notification);
- }
- break;
+ break;
case XEN_VM_EVENT_SHARING_DISABLE:
- {
if ( ved->ring_page )
rc = vm_event_disable(d, ved);
- }
- break;
+ break;
default:
rc = -ENOSYS;
diff --git a/xen/include/asm-arm/monitor.h b/xen/include/asm-arm/monitor.h
new file mode 100644
index 0000000..0f01e06
--- /dev/null
+++ b/xen/include/asm-arm/monitor.h
@@ -0,0 +1,35 @@
+/*
+ * include/asm-arm/monitor.h
+ *
+ * Architecture-specific monitor_op domctl handler.
+ *
+ * Copyright (c) 2015 Tamas K Lengyel (tamas@xxxxxxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 021110-1307, USA.
+ */
+
+#ifndef __ASM_ARM_MONITOR_H__
+#define __ASM_ARM_MONITOR_H__
+
+#include <xen/sched.h>
+#include <public/domctl.h>
+
+static inline
+int monitor_domctl(struct domain *d, struct xen_domctl_monitor_op *op)
+{
+ return -ENOSYS;
+}
+
+#endif /* __ASM_X86_MONITOR_H__ */
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 23cf7d8..11efb5b 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -71,16 +71,24 @@ typedef enum {
} p2m_type_t;
static inline
-void p2m_mem_access_emulate_check(struct vcpu *v,
- const vm_event_response_t *rsp)
+int p2m_mem_access_enable_emulate(struct domain *d)
{
- /* Not supported on ARM. */
+ /* Not supported on ARM */
+ return -ENOSYS;
+}
+
+static inline
+int p2m_mem_access_disable_emulate(struct domain *d)
+{
+ /* Not supported on ARM */
+ return -ENOSYS;
}
static inline
-void p2m_setup_introspection(struct domain *d)
+void p2m_mem_access_emulate_check(struct vcpu *v,
+ const vm_event_response_t *rsp)
{
- /* No special setup on ARM. */
+ /* Not supported on ARM. */
}
#define p2m_is_foreign(_t) ((_t) == p2m_map_foreign)
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 89a688f..fc0bfe3 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -338,7 +338,27 @@ struct arch_domain
/* Shared page for notifying that explicit PIRQ EOI is required. */
unsigned long *pirq_eoi_map;
unsigned long pirq_eoi_map_mfn;
-};
+
+ /* Monitor options */
+ struct {
+ uint16_t mov_to_cr0_enabled : 1;
+ uint16_t mov_to_cr0_sync : 1;
+ uint16_t mov_to_cr0_onchangeonly : 1;
+ uint16_t mov_to_cr3_enabled : 1;
+ uint16_t mov_to_cr3_sync : 1;
+ uint16_t mov_to_cr3_onchangeonly : 1;
+ uint16_t mov_to_cr4_enabled : 1;
+ uint16_t mov_to_cr4_sync : 1;
+ uint16_t mov_to_cr4_onchangeonly : 1;
+ uint16_t mov_to_msr_enabled : 1;
+ uint16_t mov_to_msr_extended : 1;
+ uint16_t singlestep_enabled : 1;
+ uint16_t software_breakpoint_enabled : 1;
+ } monitor;
+
+ /* Mem_access emulation control */
+ bool_t mem_access_emulate_enabled;
+} __cacheline_aligned;
#define has_arch_pdevs(d) (!list_empty(&(d)->arch.pdev_list))
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index 0702bf5..3b21a55 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -135,7 +135,6 @@ struct hvm_domain {
bool_t mem_sharing_enabled;
bool_t qemu_mapcache_invalidate;
bool_t is_s3_suspended;
- bool_t introspection_enabled;
/*
* TSC value that VCPUs use to calculate their tsc_offset value.
diff --git a/xen/include/asm-x86/monitor.h b/xen/include/asm-x86/monitor.h
new file mode 100644
index 0000000..21b3e5b
--- /dev/null
+++ b/xen/include/asm-x86/monitor.h
@@ -0,0 +1,31 @@
+/*
+ * include/asm-x86/monitor.h
+ *
+ * Architecture-specific monitor_op domctl handler.
+ *
+ * Copyright (c) 2015 Tamas K Lengyel (tamas@xxxxxxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 021110-1307, USA.
+ */
+
+#ifndef __ASM_X86_MONITOR_H__
+#define __ASM_X86_MONITOR_H__
+
+struct domain;
+struct xen_domctl_monitor_op;
+
+int monitor_domctl(struct domain *d, struct xen_domctl_monitor_op *op);
+
+#endif /* __ASM_X86_MONITOR_H__ */
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 91fc099..2b5f0fc 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -607,24 +607,39 @@ long p2m_set_mem_access(struct domain *d, unsigned long
start_pfn, uint32_t nr,
int p2m_get_mem_access(struct domain *d, unsigned long pfn,
xenmem_access_t *access);
-/* Check for emulation and mark vcpu for skipping one instruction
- * upon rescheduling if required. */
-void p2m_mem_access_emulate_check(struct vcpu *v,
- const vm_event_response_t *rsp);
+/*
+ * Emulating a memory access requires custom handling. These non-atomic
+ * functions should be called under domctl lock.
+ */
+static inline
+int p2m_mem_access_enable_emulate(struct domain *d)
+{
+ if ( d->arch.mem_access_emulate_enabled )
+ return -EEXIST;
-/* Enable arch specific introspection options (such as MSR interception). */
-void p2m_setup_introspection(struct domain *d);
+ d->arch.mem_access_emulate_enabled = 1;
+ return 0;
+}
-/* Sanity check for vm_event hardware support */
-static inline bool_t p2m_vm_event_sanity_check(struct domain *d)
+static inline
+int p2m_mem_access_disable_emulate(struct domain *d)
{
- return hap_enabled(d) && cpu_has_vmx;
+ if ( !d->arch.mem_access_emulate_enabled )
+ return -EEXIST;
+
+ d->arch.mem_access_emulate_enabled = 0;
+ return 0;
}
+/* Check for emulation and mark vcpu for skipping one instruction
+ * upon rescheduling if required. */
+void p2m_mem_access_emulate_check(struct vcpu *v,
+ const vm_event_response_t *rsp);
+
/* Sanity check for mem_access hardware support */
static inline bool_t p2m_mem_access_sanity_check(struct domain *d)
{
- return is_hvm_domain(d);
+ return is_hvm_domain(d) && cpu_has_vmx && hap_enabled(d);
}
/*
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index f0e45ac..2cbf807 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -804,7 +804,6 @@ struct xen_domctl_gdbsx_domstatus {
#define XEN_VM_EVENT_MONITOR_ENABLE 0
#define XEN_VM_EVENT_MONITOR_DISABLE 1
-#define XEN_VM_EVENT_MONITOR_ENABLE_INTROSPECTION 2
/*
* Sharing ENOMEM helper.
@@ -1012,6 +1011,51 @@ struct xen_domctl_psr_cmt_op {
typedef struct xen_domctl_psr_cmt_op xen_domctl_psr_cmt_op_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
+/* XEN_DOMCTL_MONITOR_*
+ *
+ * Enable/disable monitoring various VM events.
+ * This domctl configures what events will be reported to helper apps
+ * via the ring buffer "MONITOR". The ring has to be first enabled
+ * with the domctl XEN_DOMCTL_VM_EVENT_OP_MONITOR.
+ *
+ * NOTICE: mem_access events are also delivered via the "MONITOR" ring buffer;
+ * however, enabling/disabling those events is performed with the use of
+ * memory_op hypercalls!
+ */
+#define XEN_DOMCTL_MONITOR_OP_ENABLE 0
+#define XEN_DOMCTL_MONITOR_OP_DISABLE 1
+
+#define XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR0 0
+#define XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR3 1
+#define XEN_DOMCTL_MONITOR_EVENT_MOV_TO_CR4 2
+#define XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR 3
+#define XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP 4
+#define XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT 5
+
+struct xen_domctl_monitor_op {
+ uint32_t op; /* XEN_DOMCTL_MONITOR_OP_* */
+ uint32_t event; /* XEN_DOMCTL_MONITOR_EVENT_* */
+
+ /*
+ * Further options when issuing XEN_DOMCTL_MONITOR_OP_ENABLE.
+ */
+ union {
+ struct {
+ /* Pause vCPU until response */
+ uint8_t sync;
+ /* Send event only on a change of value */
+ uint8_t onchangeonly;
+ } mov_to_cr;
+
+ struct {
+ /* Enable the capture of an extended set of MSRs */
+ uint8_t extended_capture;
+ } mov_to_msr;
+ } u;
+};
+typedef struct xen_domctl__op xen_domctl_monitor_op_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_monitor_op_t);
+
struct xen_domctl {
uint32_t cmd;
#define XEN_DOMCTL_createdomain 1
@@ -1087,6 +1131,7 @@ struct xen_domctl {
#define XEN_DOMCTL_setvnumainfo 74
#define XEN_DOMCTL_psr_cmt_op 75
#define XEN_DOMCTL_arm_configure_domain 76
+#define XEN_DOMCTL_monitor_op 77
#define XEN_DOMCTL_gdbsx_guestmemio 1000
#define XEN_DOMCTL_gdbsx_pausevcpu 1001
#define XEN_DOMCTL_gdbsx_unpausevcpu 1002
@@ -1152,6 +1197,7 @@ struct xen_domctl {
struct xen_domctl_gdbsx_domstatus gdbsx_domstatus;
struct xen_domctl_vnuma vnuma;
struct xen_domctl_psr_cmt_op psr_cmt_op;
+ struct xen_domctl_monitor_op monitor_op;
uint8_t pad[128];
} u;
};
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 6efcc0b..7c73089 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -162,8 +162,7 @@
*/
#define HVM_PARAM_ACPI_IOPORTS_LOCATION 19
-/* Enable blocking memory events, async or sync (pause vcpu until response)
- * onchangeonly indicates messages only on a change of value */
+/* Deprecated */
#define HVM_PARAM_MEMORY_EVENT_CR0 20
#define HVM_PARAM_MEMORY_EVENT_CR3 21
#define HVM_PARAM_MEMORY_EVENT_CR4 22
@@ -171,12 +170,6 @@
#define HVM_PARAM_MEMORY_EVENT_SINGLE_STEP 25
#define HVM_PARAM_MEMORY_EVENT_MSR 30
-#define HVMPME_MODE_MASK (3 << 0)
-#define HVMPME_mode_disabled 0
-#define HVMPME_mode_async 1
-#define HVMPME_mode_sync 2
-#define HVMPME_onchangeonly (1 << 2)
-
/* Boolean: Enable nestedhvm (hvm only) */
#define HVM_PARAM_NESTEDHVM 24
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 043c26d..1fe3f75 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -390,6 +390,8 @@ DEFINE_XEN_GUEST_HANDLE(xen_mem_paging_op_t);
#define XENMEM_access_op_resume 0
#define XENMEM_access_op_set_access 1
#define XENMEM_access_op_get_access 2
+#define XENMEM_access_op_enable_emulate 3
+#define XENMEM_access_op_disable_emulate 4
typedef enum {
XENMEM_access_n,
diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h
index 28d8d7a..ed9105b 100644
--- a/xen/include/public/vm_event.h
+++ b/xen/include/public/vm_event.h
@@ -67,7 +67,7 @@
#define VM_EVENT_REASON_MOV_TO_CR3 5
/* CR4 was updated */
#define VM_EVENT_REASON_MOV_TO_CR4 6
-/* An MSR was updated. Does NOT honour HVMPME_onchangeonly */
+/* An MSR was updated. */
#define VM_EVENT_REASON_MOV_TO_MSR 7
/* Debug operation executed (e.g. int3) */
#define VM_EVENT_REASON_SOFTWARE_BREAKPOINT 8
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 136b9a1..d2cf34a 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -691,6 +691,9 @@ static int flask_domctl(struct domain *d, int cmd)
case XEN_DOMCTL_set_access_required:
return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
+ case XEN_DOMCTL_monitor_op:
+ return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
+
case XEN_DOMCTL_debug_op:
case XEN_DOMCTL_gdbsx_guestmemio:
case XEN_DOMCTL_gdbsx_pausevcpu:
diff --git a/xen/xsm/flask/policy/access_vectors
b/xen/xsm/flask/policy/access_vectors
index 23b47bf..ebe690a 100644
--- a/xen/xsm/flask/policy/access_vectors
+++ b/xen/xsm/flask/policy/access_vectors
@@ -250,6 +250,8 @@ class hvm
# HVMOP_inject_trap
hvmctl
# XEN_DOMCTL_set_access_required
+# XEN_DOMCTL_monitor_op
+# XEN_DOMCTL_vm_event_op
vm_event
# XEN_DOMCTL_mem_sharing_op and XENMEM_sharing_op_{share,add_physmap} with:
# source = the domain making the hypercall
--
2.1.4
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