Commit ca724305 authored by Wei Huang's avatar Wei Huang Committed by Paolo Bonzini

KVM: x86/vPMU: Implement AMD vPMU code for KVM

This patch replaces the empty AMD vPMU functions (in pmu_amd.c) with real
implementation.
Reviewed-by: default avatarJoerg Roedel <jroedel@suse.de>
Tested-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarWei Huang <wei@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 25462f7f
...@@ -19,11 +19,33 @@ ...@@ -19,11 +19,33 @@
#include "lapic.h" #include "lapic.h"
#include "pmu.h" #include "pmu.h"
/* duplicated from amd_perfmon_event_map, K7 and above should work. */
static struct kvm_event_hw_type_mapping amd_event_mapping[] = {
[0] = { 0x76, 0x00, PERF_COUNT_HW_CPU_CYCLES },
[1] = { 0xc0, 0x00, PERF_COUNT_HW_INSTRUCTIONS },
[2] = { 0x80, 0x00, PERF_COUNT_HW_CACHE_REFERENCES },
[3] = { 0x81, 0x00, PERF_COUNT_HW_CACHE_MISSES },
[4] = { 0xc2, 0x00, PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
[5] = { 0xc3, 0x00, PERF_COUNT_HW_BRANCH_MISSES },
[6] = { 0xd0, 0x00, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
[7] = { 0xd1, 0x00, PERF_COUNT_HW_STALLED_CYCLES_BACKEND },
};
static unsigned amd_find_arch_event(struct kvm_pmu *pmu, static unsigned amd_find_arch_event(struct kvm_pmu *pmu,
u8 event_select, u8 event_select,
u8 unit_mask) u8 unit_mask)
{ {
int i;
for (i = 0; i < ARRAY_SIZE(amd_event_mapping); i++)
if (amd_event_mapping[i].eventsel == event_select
&& amd_event_mapping[i].unit_mask == unit_mask)
break;
if (i == ARRAY_SIZE(amd_event_mapping))
return PERF_COUNT_HW_MAX; return PERF_COUNT_HW_MAX;
return amd_event_mapping[i].event_type;
} }
/* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */ /* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */
...@@ -32,53 +54,141 @@ static unsigned amd_find_fixed_event(int idx) ...@@ -32,53 +54,141 @@ static unsigned amd_find_fixed_event(int idx)
return PERF_COUNT_HW_MAX; return PERF_COUNT_HW_MAX;
} }
/* check if a PMC is enabled by comparing it against global_ctrl bits. Because
* AMD CPU doesn't have global_ctrl MSR, all PMCs are enabled (return TRUE).
*/
static bool amd_pmc_is_enabled(struct kvm_pmc *pmc) static bool amd_pmc_is_enabled(struct kvm_pmc *pmc)
{ {
return false; return true;
} }
static struct kvm_pmc *amd_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx) static struct kvm_pmc *amd_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx)
{ {
return NULL; return get_gp_pmc(pmu, MSR_K7_EVNTSEL0 + pmc_idx, MSR_K7_EVNTSEL0);
} }
/* returns 0 if idx's corresponding MSR exists; otherwise returns 1. */ /* returns 0 if idx's corresponding MSR exists; otherwise returns 1. */
static int amd_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx) static int amd_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx)
{ {
return 1; struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
idx &= ~(3u << 30);
return (idx >= pmu->nr_arch_gp_counters);
} }
/* idx is the ECX register of RDPMC instruction */ /* idx is the ECX register of RDPMC instruction */
static struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, unsigned idx) static struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, unsigned idx)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *counters;
idx &= ~(3u << 30);
if (idx >= pmu->nr_arch_gp_counters)
return NULL; return NULL;
counters = pmu->gp_counters;
return &counters[idx];
} }
static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr) static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
{ {
return false; struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
int ret = false;
ret = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0) ||
get_gp_pmc(pmu, msr, MSR_K7_EVNTSEL0);
return ret;
} }
static int amd_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data) static int amd_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc;
/* MSR_K7_PERFCTRn */
pmc = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0);
if (pmc) {
*data = pmc_read_counter(pmc);
return 0;
}
/* MSR_K7_EVNTSELn */
pmc = get_gp_pmc(pmu, msr, MSR_K7_EVNTSEL0);
if (pmc) {
*data = pmc->eventsel;
return 0;
}
return 1; return 1;
} }
static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc;
u32 msr = msr_info->index;
u64 data = msr_info->data;
/* MSR_K7_PERFCTRn */
pmc = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0);
if (pmc) {
if (!msr_info->host_initiated)
data = (s64)data;
pmc->counter += data - pmc_read_counter(pmc);
return 0;
}
/* MSR_K7_EVNTSELn */
pmc = get_gp_pmc(pmu, msr, MSR_K7_EVNTSEL0);
if (pmc) {
if (data == pmc->eventsel)
return 0;
if (!(data & pmu->reserved_bits)) {
reprogram_gp_counter(pmc, data);
return 0;
}
}
return 1; return 1;
} }
static void amd_pmu_refresh(struct kvm_vcpu *vcpu) static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
pmu->nr_arch_gp_counters = AMD64_NUM_COUNTERS;
pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << 48) - 1;
pmu->reserved_bits = 0xffffffff00200000ull;
/* not applicable to AMD; but clean them to prevent any fall out */
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
pmu->nr_arch_fixed_counters = 0;
pmu->version = 0;
pmu->global_status = 0;
} }
static void amd_pmu_init(struct kvm_vcpu *vcpu) static void amd_pmu_init(struct kvm_vcpu *vcpu)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
int i;
for (i = 0; i < AMD64_NUM_COUNTERS ; i++) {
pmu->gp_counters[i].type = KVM_PMC_GP;
pmu->gp_counters[i].vcpu = vcpu;
pmu->gp_counters[i].idx = i;
}
} }
static void amd_pmu_reset(struct kvm_vcpu *vcpu) static void amd_pmu_reset(struct kvm_vcpu *vcpu)
{ {
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
int i;
for (i = 0; i < AMD64_NUM_COUNTERS; i++) {
struct kvm_pmc *pmc = &pmu->gp_counters[i];
pmc_stop_counter(pmc);
pmc->counter = pmc->eventsel = 0;
}
} }
struct kvm_pmu_ops amd_pmu_ops = { struct kvm_pmu_ops amd_pmu_ops = {
......
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