linux-kernel - [PATCH v2 1/3] KVM: x86: check_nested

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Message-Id: <20200421165632.20157-2-pbonzini@redhat.com>
Date:   Tue, 21 Apr 2020 12:56:30 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     peterx@...hat.com,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH v2 1/3] KVM: x86: check_nested_events is never NULL

Both Intel and AMD now implement it, so (as long as the check is under
is_guest_mode) there is no need to check if the callback is implemented.

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 59958ce2b681..0492baeb78ab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7699,7 +7699,7 @@ static int inject_pending_event(struct kvm_vcpu *vcpu)
 	 * from L2 to L1 due to pending L1 events which require exit
 	 * from L2 to L1.
 	 */
-	if (is_guest_mode(vcpu) && kvm_x86_ops.check_nested_events) {
+	if (is_guest_mode(vcpu)) {
 		r = kvm_x86_ops.check_nested_events(vcpu);
 		if (r != 0)
 			return r;
@@ -7761,7 +7761,7 @@ static int inject_pending_event(struct kvm_vcpu *vcpu)
 		 * proposal and current concerns.  Perhaps we should be setting
 		 * KVM_REQ_EVENT only on certain events and not unconditionally?
 		 */
-		if (is_guest_mode(vcpu) && kvm_x86_ops.check_nested_events) {
+		if (is_guest_mode(vcpu)) {
 			r = kvm_x86_ops.check_nested_events(vcpu);
 			if (r != 0)
 				return r;
@@ -8527,7 +8527,7 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
 
 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
 {
-	if (is_guest_mode(vcpu) && kvm_x86_ops.check_nested_events)
+	if (is_guest_mode(vcpu))
 		kvm_x86_ops.check_nested_events(vcpu);
 
 	return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
-- 
2.18.2