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| author |   Sean Christopherson <seanjc@google.com> | 2024-11-27 17:33:45 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-12-18 14:19:40 -0800 |
| commit | 01d1059d635a101a21f145284e8023b0ffa5f7ed (patch) | |
| tree | 24552eca44a2cb19d28b20b657ec322434875804 | |
| parent | KVM: selftests: Update x86's KVM PV test to match KVM's disabling exits behavior (diff) | |
| download | wireguard-linux-01d1059d635a101a21f145284e8023b0ffa5f7ed.tar.xz wireguard-linux-01d1059d635a101a21f145284e8023b0ffa5f7ed.zip | |
KVM: x86: Zero out PV features cache when the CPUID leaf is not present
Clear KVM's PV feature cache prior when processing a new guest CPUID so
that KVM doesn't keep a stale cache entry if userspace does KVM_SET_CPUID2
multiple times, once with a PV features entry, and a second time without.
Fixes: 66570e966dd9 ("kvm: x86: only provide PV features if enabled in guest's CPUID")
Cc: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20241128013424.4096668-19-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 626a243febc9..1157357f499a 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -272,6 +272,8 @@ void kvm_update_pv_runtime(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best = kvm_find_kvm_cpuid_features(vcpu); + vcpu->arch.pv_cpuid.features = 0; + /* * save the feature bitmap to avoid cpuid lookup for every PV * operation |