[PATCH v13 24/48] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: 2022-11-01 14:57:50
Also in:
kvm, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), kvm x86 hyper-v (kvm/hyper-v), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Vitaly Kuznetsov, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 <redacted> Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/kvm/hyperv.h | 8 ++++++++ 1 file changed, 8 insertions(+)
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);
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2.37.3