linux-kernel - [PATCH RFC 17/19] KVM: x86: KVM_REQ_TLB_FLUSH_CURRENT is a superset of KVM_REQ_HV_TLB

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Message-Id: <20220307145023.1913205-18-vkuznets@redhat.com>
Date:   Mon,  7 Mar 2022 15:50:21 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        linux-hyperv@...r.kernel.org,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 17/19] KVM: x86: KVM_REQ_TLB_FLUSH_CURRENT is a superset of KVM_REQ_HV_TLB_FLUSH too

KVM_REQ_TLB_FLUSH_CURRENT is an even stronger operation than
KVM_REQ_TLB_FLUSH_GUEST so KVM_REQ_HV_TLB_FLUSH needs not to be
processed after it.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/x86.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0082c5691a05..81f1039c9aff 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3336,8 +3336,11 @@ static inline void kvm_vcpu_flush_tlb_current(struct kvm_vcpu *vcpu)
  */
 void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu)
 {
-	if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu))
+	if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu)) {
 		kvm_vcpu_flush_tlb_current(vcpu);
+		if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu))
+			kvm_hv_vcpu_empty_flush_tlb(vcpu);
+	}
 
 	if (kvm_check_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu)) {
 		kvm_vcpu_flush_tlb_guest(vcpu);
-- 
2.35.1