From: Radim Krčmář <rkrcmar@redhat.com>
Date: Tue, 12 Jul 2016 20:09:24 +0000 (+0200)
Subject: KVM: VMX: optimize APIC ID read with APICv
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=c93de59dcd9bef0044e615493ab52d3958243d87;p=deliverable%2Flinux.git

KVM: VMX: optimize APIC ID read with APICv

The register is in hardware-compatible format now, so there is not need
to intercept.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 729e5f689097..7bdd6b1a2373 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6461,9 +6461,6 @@ static __init int hardware_setup(void)
 	for (msr = 0x800; msr <= 0x8ff; msr++)
 		vmx_disable_intercept_msr_read_x2apic(msr);
 
-	/* According SDM, in x2apic mode, the whole id reg is used.  But in
-	 * KVM, it only use the highest eight bits. Need to intercept it */
-	vmx_enable_intercept_msr_read_x2apic(0x802);
 	/* TMCCT */
 	vmx_enable_intercept_msr_read_x2apic(0x839);
 	/* TPR */