linux-kernel - [PATCH 38/43] KVM: VMX: Don't redo x2APIC MSR bitmaps when userspace filter is changed

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Message-Id: <20210424004645.3950558-39-seanjc@google.com>
Date:   Fri, 23 Apr 2021 17:46:40 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 38/43] KVM: VMX: Don't redo x2APIC MSR bitmaps when userspace
 filter is changed

Drop an explicit call to update the x2APIC MSRs when the userspace MSR
filter is modified.  The x2APIC MSRs are deliberately exempt from
userspace filtering.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/vmx.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 45a013631f63..beaf9fefddad 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4055,7 +4055,6 @@ static void vmx_msr_filter_changed(struct kvm_vcpu *vcpu)
 	}
 
 	pt_update_intercept_for_msr(vcpu);
-	vmx_update_msr_bitmap_x2apic(vcpu, vmx_msr_bitmap_mode(vcpu));
 }
 
 static inline bool kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu,
-- 
2.31.1.498.g6c1eba8ee3d-goog