linux-kernel - [PATCH 3/7] KVM: x86/pmu: Pass "struct kvm_pmu *" to the find_fixed

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Message-Id: <20211112095139.21775-4-likexu@tencent.com>
Date:   Fri, 12 Nov 2021 17:51:35 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com>
Subject: [PATCH 3/7] KVM: x86/pmu: Pass "struct kvm_pmu *" to the find_fixed_event()

From: Like Xu <likexu@...cent.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@...cent.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