KVM: SVM: Remove unnecessary APICv/AVIC update in vCPU unblocking path

Remove handling of KVM_REQ_APICV_UPDATE from svm_vcpu_unblocking(), it's
no longer needed as it was made obsolete by commit b0941c5a85f3 ("KVM:
SVM: call avic_vcpu_load/avic_vcpu_put when enabling/disabling AVIC").
Prior to that commit, the manual check was necessary to ensure the AVIC
stuff was updated by avic_set_running() when a request to enable APICv
became pending while the vCPU was blocking, as the request handling
itself would not do the update.  But, as evidenced by the commit, that
logic was flawed and subject to various races.

Now that svm_refresh_apicv_exec_ctrl() does avic_vcpu_load/put() in
response to an APICv status change, drop the manual check in the
unblocking path.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211208015236.1616697-13-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 2d8278167c0f0a88ee849467b96d7e04c9dcfc39..7efe034c44c17fad1690086281f31a8c85e11d13 100644 (file)
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -1040,7 +1040,5 @@ void svm_vcpu_blocking(struct kvm_vcpu *vcpu)
 
 void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
 {
-       if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu))
-               kvm_vcpu_update_apicv(vcpu);
        avic_set_running(vcpu, true);
 }