From: Andrey Smetanin asmeta...@virtuozzo.com
KVM Hyper-V based guests can notify hypervisor about
occurred guest crash by writing into Hyper-V crash MSR's.
This patch does handling and migration of HV_X64_MSR_CRASH_P0-P4,
HV_X64_MSR_CRASH_CTL msrs. User can enable these MSR's by
'hv-crash' option.
Signed-off-by: Andrey Smetanin asmeta...@virtuozzo.com
Signed-off-by: Denis V. Lunev d...@openvz.org
CC: Paolo Bonzini pbonz...@redhat.com
CC: Andreas Färber afaer...@suse.de
---
linux-headers/asm-x86/hyperv.h | 13 +
target-i386/cpu-qom.h | 1 +
target-i386/cpu.c | 1 +
target-i386/cpu.h | 2 ++
target-i386/kvm.c | 32 +++-
target-i386/machine.c | 27 +++
6 files changed, 75 insertions(+), 1 deletion(-)
diff --git a/linux-headers/asm-x86/hyperv.h b/linux-headers/asm-x86/hyperv.h
index ce6068d..5f88dc7 100644
--- a/linux-headers/asm-x86/hyperv.h
+++ b/linux-headers/asm-x86/hyperv.h
@@ -108,6 +108,8 @@
#define HV_X64_HYPERCALL_PARAMS_XMM_AVAILABLE (1 4)
/* Support for a virtual guest idle state is available */
#define HV_X64_GUEST_IDLE_STATE_AVAILABLE (1 5)
+/* Guest crash data handler available */
+#define HV_X64_GUEST_CRASH_MSR_AVAILABLE (1 10)
/*
* Implementation recommendations. Indicates which behaviors the hypervisor
@@ -199,6 +201,17 @@
#define HV_X64_MSR_STIMER3_CONFIG 0x40B6
#define HV_X64_MSR_STIMER3_COUNT 0x40B7
+/* Hypev-V guest crash notification MSR's */
+#define HV_X64_MSR_CRASH_P00x4100
+#define HV_X64_MSR_CRASH_P10x4101
+#define HV_X64_MSR_CRASH_P20x4102
+#define HV_X64_MSR_CRASH_P30x4103
+#define HV_X64_MSR_CRASH_P40x4104
+#define HV_X64_MSR_CRASH_CTL 0x4105
+#define HV_X64_MSR_CRASH_CTL_NOTIFY(1ULL 63)
+#define HV_X64_MSR_CRASH_PARAMS\
+ (1 + (HV_X64_MSR_CRASH_P4 - HV_X64_MSR_CRASH_P0))
+
#define HV_X64_MSR_HYPERCALL_ENABLE0x0001
#define HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT12
#define HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_MASK \
diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
index 7a4fddd..c35b624 100644
--- a/target-i386/cpu-qom.h
+++ b/target-i386/cpu-qom.h
@@ -89,6 +89,7 @@ typedef struct X86CPU {
bool hyperv_relaxed_timing;
int hyperv_spinlock_attempts;
bool hyperv_time;
+bool hyperv_crash;
bool check_cpuid;
bool enforce_cpuid;
bool expose_kvm;
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 36b07f9..04a8408 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -3117,6 +3117,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL(hv-relaxed, X86CPU, hyperv_relaxed_timing, false),
DEFINE_PROP_BOOL(hv-vapic, X86CPU, hyperv_vapic, false),
DEFINE_PROP_BOOL(hv-time, X86CPU, hyperv_time, false),
+DEFINE_PROP_BOOL(hv-crash, X86CPU, hyperv_crash, false),
DEFINE_PROP_BOOL(check, X86CPU, check_cpuid, false),
DEFINE_PROP_BOOL(enforce, X86CPU, enforce_cpuid, false),
DEFINE_PROP_BOOL(kvm, X86CPU, expose_kvm, true),
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 603aaf0..6c2352a 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -21,6 +21,7 @@
#include config.h
#include qemu-common.h
+#include asm/hyperv.h
#ifdef TARGET_X86_64
#define TARGET_LONG_BITS 64
@@ -904,6 +905,7 @@ typedef struct CPUX86State {
uint64_t msr_hv_guest_os_id;
uint64_t msr_hv_vapic;
uint64_t msr_hv_tsc;
+uint64_t msr_hv_crash_prm[HV_X64_MSR_CRASH_PARAMS];
/* exception/interrupt handling */
int error_code;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index daced5c..3d1fca5 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -79,6 +79,7 @@ static int lm_capable_kernel;
static bool has_msr_hv_hypercall;
static bool has_msr_hv_vapic;
static bool has_msr_hv_tsc;
+static bool has_msr_hv_crash;
static bool has_msr_mtrr;
static bool has_msr_xss;
@@ -449,7 +450,8 @@ static bool hyperv_enabled(X86CPU *cpu)
return kvm_check_extension(cs-kvm_state, KVM_CAP_HYPERV) 0
(hyperv_hypercall_available(cpu) ||
cpu-hyperv_time ||
-cpu-hyperv_relaxed_timing);
+cpu-hyperv_relaxed_timing ||
+cpu-hyperv_crash);
}
static Error *invtsc_mig_blocker;
@@ -515,6 +517,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
c-eax |= 0x200;
has_msr_hv_tsc = true;
}
+if (cpu-hyperv_crash has_msr_hv_crash) {
+c-edx |= HV_X64_GUEST_CRASH_MSR_AVAILABLE;
+}
+
c = cpuid_data.entries[cpuid_i++];
c-function = HYPERV_CPUID_ENLIGHTMENT_INFO;
if (cpu-hyperv_relaxed_timing) {
@@ -831,6 +837,10 @@ static int kvm_get_supported_msrs(KVMState *s)
