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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-11-01 15:54:02 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-18 12:59:15 -0500 |
| commit | d4baf1a9a572910d7b4cd63d23bf4be89b7648bd (patch) | |
| tree | 852e3b9e8bf12ebd4c5c1ab73e8daf3e8089695d /arch/x86/kvm/hyperv.h | |
| parent | c58a318f6090efe06e6702b8882e2026f44f620e (diff) | |
| download | linux-d4baf1a9a572910d7b4cd63d23bf4be89b7648bd.tar.gz linux-d4baf1a9a572910d7b4cd63d23bf4be89b7648bd.tar.bz2 linux-d4baf1a9a572910d7b4cd63d23bf4be89b7648bd.zip | |
KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check
Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL
from L2 in L0 to process L2 TLB flush requests.
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-25-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.h')
| -rw-r--r-- | arch/x86/kvm/hyperv.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 7706e203ff43..bd698eb2bda1 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -174,6 +174,14 @@ static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) kfifo_reset_out(&tlb_flush_fifo->entries); } +static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu && + (hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH); +} + static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) { struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |