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Subject[PATCH 3/7] KVM: x86/pmu: Pass "struct kvm_pmu *" to the find_fixed_event()
Date
From: Like Xu <likexu@tencent.com>

The KVM userspace may make some hw events (including cpu-cycles,
instruction, ref-cpu-cycles) not work properly by marking bits in the
guest CPUID 0AH.EBX leaf, but these counters will still be accessible.

As a preliminary preparation, this part of the check depends on the
access to the pmu->available_event_types value in the find_fixed_event
as well as find_arch_event().

Signed-off-by: Like Xu <likexu@tencent.com>
---
arch/x86/kvm/pmu.c | 3 ++-
arch/x86/kvm/pmu.h | 2 +-
arch/x86/kvm/svm/pmu.c | 2 +-
arch/x86/kvm/vmx/pmu_intel.c | 2 +-
4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 0772bad9165c..7093fc70cd38 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -245,6 +245,7 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
bool pmi = ctrl & 0x8;
struct kvm_pmu_event_filter *filter;
struct kvm *kvm = pmc->vcpu->kvm;
+ struct kvm_pmu *pmu = pmc_to_pmu(pmc);

pmc_pause_counter(pmc);

@@ -268,7 +269,7 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)

pmc->current_config = (u64)ctrl;
pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE,
- kvm_x86_ops.pmu_ops->find_fixed_event(idx),
+ kvm_x86_ops.pmu_ops->find_fixed_event(pmu, idx),
!(en_field & 0x2), /* exclude user */
!(en_field & 0x1), /* exclude kernel */
pmi, false, false);
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 0e4f2b1fa9fb..fe29537b1343 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -26,7 +26,7 @@ struct kvm_event_hw_type_mapping {
struct kvm_pmu_ops {
unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
u8 unit_mask);
- unsigned (*find_fixed_event)(int idx);
+ unsigned int (*find_fixed_event)(struct kvm_pmu *pmu, int idx);
bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
struct kvm_pmc *(*rdpmc_ecx_to_pmc)(struct kvm_vcpu *vcpu,
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index fdf587f19c5f..3ee8f86d9ace 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -152,7 +152,7 @@ static unsigned amd_find_arch_event(struct kvm_pmu *pmu,
}

/* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */
-static unsigned amd_find_fixed_event(int idx)
+static unsigned int amd_find_fixed_event(struct kvm_pmu *pmu, int idx)
{
return PERF_COUNT_HW_MAX;
}
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index bc6845265362..4c04e94ae548 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -86,7 +86,7 @@ static unsigned intel_find_arch_event(struct kvm_pmu *pmu,
return intel_arch_events[i].event_type;
}

-static unsigned intel_find_fixed_event(int idx)
+static unsigned int intel_find_fixed_event(struct kvm_pmu *pmu, int idx)
{
u32 event;
size_t size = ARRAY_SIZE(fixed_pmc_events);
--
2.33.0
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