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KVM: x86/pmu: Change ambiguous _mask suffix to _rsvd in kvm_pmu

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Several '_mask' suffixed variables such as, global_ctrl_mask, are
defined in kvm_pmu structure. However the _mask suffix is ambiguous and
misleading since it's not a real mask with positive logic. On the contrary
it represents the reserved bits of corresponding MSRs and these bits
should not be accessed.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20240430005239.13527-2-dapeng1.mi@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Dapeng Mi 2024-04-30 08:52:38 +08:00 committed by Sean Christopherson
parent 0c468a6a02
commit 0e102ce3d4
5 changed files with 29 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/include/asm/kvm_host.h
View File

@ -546,12 +546,12 @@ struct kvm_pmu {
unsigned nr_arch_fixed_counters;
unsigned available_event_types;
u64 fixed_ctr_ctrl;
u64 fixed_ctr_ctrl_mask;
u64 fixed_ctr_ctrl_rsvd;
u64 global_ctrl;
u64 global_status;
u64 counter_bitmask[2];
u64 global_ctrl_mask;
u64 global_status_mask;
u64 global_ctrl_rsvd;
u64 global_status_rsvd;
u64 reserved_bits;
u64 raw_event_mask;
struct kvm_pmc gp_counters[KVM_INTEL_PMC_MAX_GENERIC];
@ -571,9 +571,9 @@ struct kvm_pmu {
u64 ds_area;
u64 pebs_enable;
u64 pebs_enable_mask;
u64 pebs_enable_rsvd;
u64 pebs_data_cfg;
u64 pebs_data_cfg_mask;
u64 pebs_data_cfg_rsvd;
/*
* If a guest counter is cross-mapped to host counter with different

16
arch/x86/kvm/pmu.c
View File

@ -681,13 +681,13 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!msr_info->host_initiated)
break;
if (data & pmu->global_status_mask)
if (data & pmu->global_status_rsvd)
return 1;
pmu->global_status = data;
break;
case MSR_AMD64_PERF_CNTR_GLOBAL_CTL:
data &= ~pmu->global_ctrl_mask;
data &= ~pmu->global_ctrl_rsvd;
fallthrough;
case MSR_CORE_PERF_GLOBAL_CTRL:
if (!kvm_valid_perf_global_ctrl(pmu, data))
@ -704,7 +704,7 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
* GLOBAL_OVF_CTRL, a.k.a. GLOBAL STATUS_RESET, clears bits in
* GLOBAL_STATUS, and so the set of reserved bits is the same.
*/
if (data & pmu->global_status_mask)
if (data & pmu->global_status_rsvd)
return 1;
fallthrough;
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR:
@ -768,11 +768,11 @@ void kvm_pmu_refresh(struct kvm_vcpu *vcpu)
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
pmu->reserved_bits = 0xffffffff00200000ull;
pmu->raw_event_mask = X86_RAW_EVENT_MASK;
pmu->global_ctrl_mask = ~0ull;
pmu->global_status_mask = ~0ull;
pmu->fixed_ctr_ctrl_mask = ~0ull;
pmu->pebs_enable_mask = ~0ull;
pmu->pebs_data_cfg_mask = ~0ull;
pmu->global_ctrl_rsvd = ~0ull;
pmu->global_status_rsvd = ~0ull;
pmu->fixed_ctr_ctrl_rsvd = ~0ull;
pmu->pebs_enable_rsvd = ~0ull;
pmu->pebs_data_cfg_rsvd = ~0ull;
bitmap_zero(pmu->all_valid_pmc_idx, X86_PMC_IDX_MAX);
if (!vcpu->kvm->arch.enable_pmu)

2
arch/x86/kvm/pmu.h
View File

@ -129,7 +129,7 @@ static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu,
u64 data)
{
return !(pmu->global_ctrl_mask & data);
return !(pmu->global_ctrl_rsvd & data);
}
/* returns general purpose PMC with the specified MSR. Note that it can be

4
arch/x86/kvm/svm/pmu.c
View File

@ -199,8 +199,8 @@ static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
kvm_pmu_cap.num_counters_gp);
if (pmu->version > 1) {
pmu->global_ctrl_mask = ~((1ull << pmu->nr_arch_gp_counters) - 1);
pmu->global_status_mask = pmu->global_ctrl_mask;
pmu->global_ctrl_rsvd = ~((1ull << pmu->nr_arch_gp_counters) - 1);
pmu->global_status_rsvd = pmu->global_ctrl_rsvd;
}
pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << 48) - 1;

26
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -348,14 +348,14 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
switch (msr) {
case MSR_CORE_PERF_FIXED_CTR_CTRL:
if (data & pmu->fixed_ctr_ctrl_mask)
if (data & pmu->fixed_ctr_ctrl_rsvd)
return 1;
if (pmu->fixed_ctr_ctrl != data)
reprogram_fixed_counters(pmu, data);
break;
case MSR_IA32_PEBS_ENABLE:
if (data & pmu->pebs_enable_mask)
if (data & pmu->pebs_enable_rsvd)
return 1;
if (pmu->pebs_enable != data) {
@ -371,7 +371,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
pmu->ds_area = data;
break;
case MSR_PEBS_DATA_CFG:
if (data & pmu->pebs_data_cfg_mask)
if (data & pmu->pebs_data_cfg_rsvd)
return 1;
pmu->pebs_data_cfg = data;
@ -456,7 +456,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
union cpuid10_eax eax;
union cpuid10_edx edx;
u64 perf_capabilities;
u64 counter_mask;
u64 counter_rsvd;
int i;
memset(&lbr_desc->records, 0, sizeof(lbr_desc->records));
@ -502,21 +502,21 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
}
for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
pmu->fixed_ctr_ctrl_mask &= ~(0xbull << (i * 4));
counter_mask = ~(((1ull << pmu->nr_arch_gp_counters) - 1) |
pmu->fixed_ctr_ctrl_rsvd &= ~(0xbull << (i * 4));
counter_rsvd = ~(((1ull << pmu->nr_arch_gp_counters) - 1) |
(((1ull << pmu->nr_arch_fixed_counters) - 1) << KVM_FIXED_PMC_BASE_IDX));
pmu->global_ctrl_mask = counter_mask;
pmu->global_ctrl_rsvd = counter_rsvd;
/*
* GLOBAL_STATUS and GLOBAL_OVF_CONTROL (a.k.a. GLOBAL_STATUS_RESET)
* share reserved bit definitions. The kernel just happens to use
* OVF_CTRL for the names.
*/
pmu->global_status_mask = pmu->global_ctrl_mask
pmu->global_status_rsvd = pmu->global_ctrl_rsvd
& ~(MSR_CORE_PERF_GLOBAL_OVF_CTRL_OVF_BUF |
MSR_CORE_PERF_GLOBAL_OVF_CTRL_COND_CHGD);
if (vmx_pt_mode_is_host_guest())
pmu->global_status_mask &=
pmu->global_status_rsvd &=
~MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI;
entry = kvm_find_cpuid_entry_index(vcpu, 7, 0);
@ -544,15 +544,15 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
if (perf_capabilities & PERF_CAP_PEBS_FORMAT) {
if (perf_capabilities & PERF_CAP_PEBS_BASELINE) {
pmu->pebs_enable_mask = counter_mask;
pmu->pebs_enable_rsvd = counter_rsvd;
pmu->reserved_bits &= ~ICL_EVENTSEL_ADAPTIVE;
for (i = 0; i < pmu->nr_arch_fixed_counters; i++) {
pmu->fixed_ctr_ctrl_mask &=
pmu->fixed_ctr_ctrl_rsvd &=
~(1ULL << (KVM_FIXED_PMC_BASE_IDX + i * 4));
}
pmu->pebs_data_cfg_mask = ~0xff00000full;
pmu->pebs_data_cfg_rsvd = ~0xff00000full;
} else {
pmu->pebs_enable_mask =
pmu->pebs_enable_rsvd =
~((1ull << pmu->nr_arch_gp_counters) - 1);
}
}