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[Qemu-devel] [PATCH v2 2/2] kvm: migrate vPMU state
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From: |
Paolo Bonzini |
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Subject: |
[Qemu-devel] [PATCH v2 2/2] kvm: migrate vPMU state |
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Date: |
Thu, 25 Jul 2013 17:05:22 +0200 |
Signed-off-by: Paolo Bonzini <address@hidden>
---
target-i386/cpu.h | 23 +++++++++++++
target-i386/kvm.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++---
target-i386/machine.c | 44 ++++++++++++++++++++++++
3 files changed, 155 insertions(+), 5 deletions(-)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index d19d111..15d6d6a 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -304,6 +304,8 @@
#define MSR_TSC_ADJUST 0x0000003b
#define MSR_IA32_TSCDEADLINE 0x6e0
+#define MSR_P6_PERFCTR0 0xc1
+
#define MSR_MTRRcap 0xfe
#define MSR_MTRRcap_VCNT 8
#define MSR_MTRRcap_FIXRANGE_SUPPORT (1 << 8)
@@ -317,6 +319,8 @@
#define MSR_MCG_STATUS 0x17a
#define MSR_MCG_CTL 0x17b
+#define MSR_P6_EVNTSEL0 0x186
+
#define MSR_IA32_PERF_STATUS 0x198
#define MSR_IA32_MISC_ENABLE 0x1a0
@@ -342,6 +346,14 @@
#define MSR_MTRRdefType 0x2ff
+#define MSR_CORE_PERF_FIXED_CTR0 0x309
+#define MSR_CORE_PERF_FIXED_CTR1 0x30a
+#define MSR_CORE_PERF_FIXED_CTR2 0x30b
+#define MSR_CORE_PERF_FIXED_CTR_CTRL 0x38d
+#define MSR_CORE_PERF_GLOBAL_STATUS 0x38e
+#define MSR_CORE_PERF_GLOBAL_CTRL 0x38f
+#define MSR_CORE_PERF_GLOBAL_OVF_CTRL 0x390
+
#define MSR_MC0_CTL 0x400
#define MSR_MC0_STATUS 0x401
#define MSR_MC0_ADDR 0x402
@@ -720,6 +732,9 @@ typedef struct {
#define CPU_NB_REGS CPU_NB_REGS32
#endif
+#define MAX_FIXED_COUNTERS 3
+#define MAX_GP_COUNTERS (MSR_IA32_PERF_STATUS - MSR_P6_EVNTSEL0)
+
#define NB_MMU_MODES 3
typedef enum TPRAccess {
@@ -814,6 +829,14 @@ typedef struct CPUX86State {
uint64_t mcg_status;
uint64_t msr_ia32_misc_enable;
+ uint64_t msr_fixed_ctr_ctrl;
+ uint64_t msr_global_ctrl;
+ uint64_t msr_global_status;
+ uint64_t msr_global_ovf_ctrl;
+ uint64_t msr_fixed_counters[MAX_FIXED_COUNTERS];
+ uint64_t msr_gp_counters[MAX_GP_COUNTERS];
+ uint64_t msr_gp_evtsel[MAX_GP_COUNTERS];
+
/* exception/interrupt handling */
int error_code;
int exception_is_int;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 3c9d10a..96ec1f4 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -71,6 +71,9 @@ static bool has_msr_misc_enable;
static bool has_msr_kvm_steal_time;
static int lm_capable_kernel;
+static bool has_msr_architectural_pmu;
+static uint32_t num_architectural_pmu_counters;
+
bool kvm_allows_irq0_override(void)
{
return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
@@ -581,6 +584,25 @@ int kvm_arch_init_vcpu(CPUState *cs)
break;
}
}
+
+ if (limit >= 0x0a) {
+ uint32_t ver;
+
+ cpu_x86_cpuid(env, 0x0a, 0, &ver, &unused, &unused, &unused);
+ if ((ver & 0xff) > 0) {
+ has_msr_architectural_pmu = true;
+ num_architectural_pmu_counters = (ver & 0xff00) >> 8;
+
+ /* Shouldn't be more than 32, since that's the number of bits
+ * available in EBX to tell us _which_ counters are available.
+ * Play it safe.
+ */
+ if (num_architectural_pmu_counters > MAX_GP_COUNTERS) {
+ num_architectural_pmu_counters = MAX_GP_COUNTERS;
+ }
+ }
+ }
+
cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused);
for (i = 0x80000000; i <= limit; i++) {
@@ -1052,7 +1074,7 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
struct kvm_msr_entry entries[100];
} msr_data;
struct kvm_msr_entry *msrs = msr_data.entries;
- int n = 0;
+ int n = 0, i;
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
@@ -1094,9 +1116,8 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
}
}
/*
- * The following paravirtual MSRs have side effects on the guest or are
- * too heavy for normal writeback. Limit them to reset or full state
- * updates.
+ * The following MSRs have side effects on the guest or are too heavy
+ * for normal writeback. Limit them to reset or full state updates.
*/
if (level >= KVM_PUT_RESET_STATE) {
kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
@@ -1114,6 +1135,33 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
kvm_msr_entry_set(&msrs[n++], MSR_KVM_STEAL_TIME,
env->steal_time_msr);
}
+ if (has_msr_architectural_pmu) {
+ /* Stop the counter. */
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_FIXED_CTR_CTRL, 0);
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_GLOBAL_CTRL, 0);
+
+ /* Set the counter values. */
+ for (i = 0; i < MAX_FIXED_COUNTERS; i++) {
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_FIXED_CTR0 + i,
+ env->msr_fixed_counters[i]);
+ }
+ for (i = 0; i < num_architectural_pmu_counters; i++) {
+ kvm_msr_entry_set(&msrs[n++], MSR_P6_PERFCTR0 + i,
+ env->msr_gp_counters[i]);
+ kvm_msr_entry_set(&msrs[n++], MSR_P6_EVNTSEL0 + i,
+ env->msr_gp_evtsel[i]);
+ }
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_GLOBAL_STATUS,
+ env->msr_global_status);
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_GLOBAL_OVF_CTRL,
+ env->msr_global_ovf_ctrl);
+
+ /* Now start the PMU. */
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_FIXED_CTR_CTRL,
+ env->msr_fixed_ctr_ctrl);
+ kvm_msr_entry_set(&msrs[n++], MSR_CORE_PERF_GLOBAL_CTRL,
+ env->msr_global_ctrl);
+ }
if (hyperv_hypercall_available()) {
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_GUEST_OS_ID, 0);
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_HYPERCALL, 0);
@@ -1370,6 +1418,19 @@ static int kvm_get_msrs(X86CPU *cpu)
if (has_msr_kvm_steal_time) {
msrs[n++].index = MSR_KVM_STEAL_TIME;
}
+ if (has_msr_architectural_pmu) {
+ msrs[n++].index = MSR_CORE_PERF_FIXED_CTR_CTRL;
+ msrs[n++].index = MSR_CORE_PERF_GLOBAL_CTRL;
+ msrs[n++].index = MSR_CORE_PERF_GLOBAL_STATUS;
+ msrs[n++].index = MSR_CORE_PERF_GLOBAL_OVF_CTRL;
+ for (i = 0; i < MAX_FIXED_COUNTERS; i++) {
+ msrs[n++].index = MSR_CORE_PERF_FIXED_CTR0 + i;
+ }
+ for (i = 0; i < num_architectural_pmu_counters; i++) {
+ msrs[n++].index = MSR_P6_PERFCTR0 + i;
+ msrs[n++].index = MSR_P6_EVNTSEL0 + i;
+ }
+ }
if (env->mcg_cap) {
msrs[n++].index = MSR_MCG_STATUS;
@@ -1386,7 +1447,8 @@ static int kvm_get_msrs(X86CPU *cpu)
}
for (i = 0; i < ret; i++) {
- switch (msrs[i].index) {
+ uint32_t index = msrs[i].index;
+ switch (index) {
case MSR_IA32_SYSENTER_CS:
env->sysenter_cs = msrs[i].data;
break;
@@ -1458,6 +1520,27 @@ static int kvm_get_msrs(X86CPU *cpu)
case MSR_KVM_STEAL_TIME:
env->steal_time_msr = msrs[i].data;
break;
+ case MSR_CORE_PERF_FIXED_CTR_CTRL:
+ env->msr_fixed_ctr_ctrl = msrs[i].data;
+ break;
+ case MSR_CORE_PERF_GLOBAL_CTRL:
+ env->msr_global_ctrl = msrs[i].data;
+ break;
+ case MSR_CORE_PERF_GLOBAL_STATUS:
+ env->msr_global_status = msrs[i].data;
+ break;
+ case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+ env->msr_global_ovf_ctrl = msrs[i].data;
+ break;
+ case MSR_CORE_PERF_FIXED_CTR0 ... MSR_CORE_PERF_FIXED_CTR0 +
MAX_FIXED_COUNTERS - 1:
+ env->msr_fixed_counters[index - MSR_CORE_PERF_FIXED_CTR0] =
msrs[i].data;
+ break;
+ case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR0 + MAX_GP_COUNTERS - 1:
+ env->msr_gp_counters[index - MSR_P6_PERFCTR0] = msrs[i].data;
+ break;
+ case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL0 + MAX_GP_COUNTERS - 1:
+ env->msr_gp_evtsel[index - MSR_P6_EVNTSEL0] = msrs[i].data;
+ break;
}
}
diff --git a/target-i386/machine.c b/target-i386/machine.c
index f9ec581..076a39d 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -446,6 +446,47 @@ static const VMStateDescription
vmstate_msr_ia32_misc_enable = {
}
};
+static bool pmu_enable_needed(void *opaque)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+ int i;
+
+ if (env->msr_fixed_ctr_ctrl || env->msr_global_ctrl ||
+ env->msr_global_status || env->msr_global_ovf_ctrl) {
+ return true;
+ }
+ for (i = 0; i < MAX_FIXED_COUNTERS; i++) {
+ if (env->msr_fixed_counters[i]) {
+ return true;
+ }
+ }
+ for (i = 0; i < MAX_GP_COUNTERS; i++) {
+ if (env->msr_gp_counters[i] || env->msr_gp_evtsel[i]) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static const VMStateDescription vmstate_msr_architectural_pmu = {
+ .name = "cpu/msr_architectural_pmu",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT64(env.msr_fixed_ctr_ctrl, X86CPU),
+ VMSTATE_UINT64(env.msr_global_ctrl, X86CPU),
+ VMSTATE_UINT64(env.msr_global_status, X86CPU),
+ VMSTATE_UINT64(env.msr_global_ovf_ctrl, X86CPU),
+ VMSTATE_UINT64_ARRAY(env.msr_fixed_counters, X86CPU,
MAX_FIXED_COUNTERS),
+ VMSTATE_UINT64_ARRAY(env.msr_gp_counters, X86CPU, MAX_GP_COUNTERS),
+ VMSTATE_UINT64_ARRAY(env.msr_gp_evtsel, X86CPU, MAX_GP_COUNTERS),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
const VMStateDescription vmstate_x86_cpu = {
.name = "cpu",
.version_id = 12,
@@ -571,6 +612,9 @@ const VMStateDescription vmstate_x86_cpu = {
}, {
.vmsd = &vmstate_msr_ia32_misc_enable,
.needed = misc_enable_needed,
+ }, {
+ .vmsd = &vmstate_msr_architectural_pmu,
+ .needed = pmu_enable_needed,
} , {
/* empty */
}
--
1.8.3.1
Re: [Qemu-devel] [PATCH v2 0/2] kvm: migrate vPMU state, Andreas Färber, 2013/07/28