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[2/2] KVM: lapic: don't recalculate apic map table twice when enabling LAPIC

Message ID 1470197053-3581-2-git-send-email-wanpeng.li@hotmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Wanpeng Li Aug. 3, 2016, 4:04 a.m. UTC 
From: Wanpeng Li <wanpeng.li@hotmail.com>

APIC map table is recalculated during reset APIC ID to the initial value
when enabling LAPIC. This patch move the recalculate_apic_map() to the 
next branch since we don't need to recalculate apic map twice in current
codes.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
---
 arch/x86/kvm/lapic.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

Radim Krčmář Aug. 3, 2016, 9:57 a.m. UTC | #1 
2016-08-03 12:04+0800, Wanpeng Li:
> From: Wanpeng Li <wanpeng.li@hotmail.com>
> 
> APIC map table is recalculated during reset APIC ID to the initial value
> when enabling LAPIC. This patch move the recalculate_apic_map() to the 
> next branch since we don't need to recalculate apic map twice in current
> codes.
> 
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
> ---

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>

> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> @@ -1760,9 +1760,10 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
>  		if (value & MSR_IA32_APICBASE_ENABLE) {
>  			kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
>  			static_key_slow_dec_deferred(&apic_hw_disabled);
> -		} else
> +		} else {
>  			static_key_slow_inc(&apic_hw_disabled.key);
> -		recalculate_apic_map(vcpu->kvm);
> +			recalculate_apic_map(vcpu->kvm);
> +		}
>  	}
>  
>  	if ((old_value ^ value) & X2APIC_ENABLE) {
> -- 
> 1.9.1
> 
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diff mbox

Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 0120a58..d676f4b 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1760,9 +1760,10 @@  void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 		if (value & MSR_IA32_APICBASE_ENABLE) {
 			kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
 			static_key_slow_dec_deferred(&apic_hw_disabled);
-		} else
+		} else {
 			static_key_slow_inc(&apic_hw_disabled.key);
-		recalculate_apic_map(vcpu->kvm);
+			recalculate_apic_map(vcpu->kvm);
+		}
 	}
 
 	if ((old_value ^ value) & X2APIC_ENABLE) {