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KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter

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[ Upstream commit 2c985527dd8d283e786ad7a67e532ef7f6f00fac ]

The mask value of fixed counter control register should be dynamic
adjusted with the number of fixed counters. This patch introduces a
variable that includes the reserved bits of fixed counter control
registers. This is a generic code refactoring.

Co-developed-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Message-Id: <20220411101946.20262-6-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Like Xu 2022-04-11 18:19:34 +08:00 committed by Greg Kroah-Hartman
parent fc1f790397
commit eb8f7dee28
2 changed files with 6 additions and 1 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -505,6 +505,7 @@ struct kvm_pmu {
unsigned nr_arch_fixed_counters;
unsigned available_event_types;
u64 fixed_ctr_ctrl;
u64 fixed_ctr_ctrl_mask;
u64 global_ctrl;
u64 global_status;
u64 counter_bitmask[2];

6
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -395,7 +395,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
case MSR_CORE_PERF_FIXED_CTR_CTRL:
if (pmu->fixed_ctr_ctrl == data)
return 0;
if (!(data & 0xfffffffffffff444ull)) {
if (!(data & pmu->fixed_ctr_ctrl_mask)) {
reprogram_fixed_counters(pmu, data);
return 0;
}
@ -479,6 +479,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
struct kvm_cpuid_entry2 *entry;
union cpuid10_eax eax;
union cpuid10_edx edx;
int i;
pmu->nr_arch_gp_counters = 0;
pmu->nr_arch_fixed_counters = 0;
@ -487,6 +488,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
pmu->version = 0;
pmu->reserved_bits = 0xffffffff00200000ull;
pmu->raw_event_mask = X86_RAW_EVENT_MASK;
pmu->fixed_ctr_ctrl_mask = ~0ull;
entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
if (!entry || !vcpu->kvm->arch.enable_pmu)
@ -522,6 +524,8 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
setup_fixed_pmc_eventsel(pmu);
}
for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
pmu->fixed_ctr_ctrl_mask &= ~(0xbull << (i * 4));
pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) |
(((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED);
pmu->global_ctrl_mask = ~pmu->global_ctrl;