diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 54fdadacb27f1..164ecca7769ef 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10872,6 +10872,18 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) */ if (old_cr0 & X86_CR0_PG) kvm_mmu_reset_context(vcpu); + + /* + * Intel's SDM states that all TLB entries are flushed on INIT. AMD's + * APM states the TLBs are untouched by INIT, but it also states that + * the TLBs are flushed on "External initialization of the processor." + * Flush the guest TLB regardless of vendor, there is no meaningful + * benefit in relying on the guest to flush the TLB immediately after + * INIT. A spurious TLB flush is benign and likely negligible from a + * performance perspective. + */ + if (init_event) + kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu); } void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)