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| author | Sean Christopherson <seanjc@google.com> | 2022-06-11 03:57:52 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-20 18:49:46 +0300 |
| commit | 545feb96c052809dab5ec04b95f976acca9f9364 (patch) | |
| tree | 5fa98bf0e6b77569ded69b8f528c3b2b44213e9f /arch/x86/kvm/pmu.c | |
| parent | 5d4283df5a0fc8299fba9443c33d219939eccc2d (diff) | |
| download | linux-545feb96c052809dab5ec04b95f976acca9f9364.tar.xz | |
Revert "KVM: x86: always allow host-initiated writes to PMU MSRs"
Revert the hack to allow host-initiated accesses to all "PMU" MSRs,
as intel_is_valid_msr() returns true for _all_ MSRs, regardless of whether
or not it has a snowball's chance in hell of actually being a PMU MSR.
That mostly gets papered over by the actual get/set helpers only handling
MSRs that they knows about, except there's the minor detail that
kvm_pmu_{g,s}et_msr() eat reads and writes when the PMU is disabled.
I.e. KVM will happy allow reads and writes to _any_ MSR if the PMU is
disabled, either via module param or capability.
This reverts commit d1c88a4020567ba4da52f778bcd9619d87e4ea75.
Fixes: d1c88a402056 ("KVM: x86: always allow host-initiated writes to PMU MSRs")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220611005755.753273-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.c')
| -rw-r--r-- | arch/x86/kvm/pmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 87483e503c46..02f9e4f245bd 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -425,10 +425,10 @@ void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu) } } -bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr, bool host_initiated) +bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr) { return static_call(kvm_x86_pmu_msr_idx_to_pmc)(vcpu, msr) || - static_call(kvm_x86_pmu_is_valid_msr)(vcpu, msr, host_initiated); + static_call(kvm_x86_pmu_is_valid_msr)(vcpu, msr); } static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr) |