2018-10-16 01:03:21

by Peng Hao

Subject: [PATCH v2] kvm:x86 :remove unnecessary recalculate_apic_map

In the previous code, the variable sw_apic_disabled influences
recalculate_apic_map. But in "KVM: x86: simplify kvm_apic_map"
(commit:3b5a5ffa928a3f875b0d5dd284eeb7c322e1688a),
the access to sw_apic_disabled in recalculate_apic_map has been
deleted.

Signed-off-by: Peng Hao <[email protected]>
---
arch/x86/kvm/lapic.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 70dcb55..0380e37 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -246,10 +246,9 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)

if (enabled != apic->sw_enabled) {
apic->sw_enabled = enabled;
- if (enabled) {
+ if (enabled)
static_key_slow_dec_deferred(&apic_sw_disabled);
- recalculate_apic_map(apic->vcpu->kvm);
- } else
+ else
static_key_slow_inc(&apic_sw_disabled.key);
}
}
--
1.8.3.1

2018-10-16 12:51:28

by Wei Yang

Subject: Re: [PATCH v2] kvm:x86 :remove unnecessary recalculate_apic_map

On Tue, Oct 16, 2018 at 05:12:30PM +0800, Peng Hao wrote:
>In the previous code, the variable sw_apic_disabled influences
>recalculate_apic_map. But in "KVM: x86: simplify kvm_apic_map"
>(commit:3b5a5ffa928a3f875b0d5dd284eeb7c322e1688a),
>the access to sw_apic_disabled in recalculate_apic_map has been
>deleted.

s/sw_apic_disabled/apic_sw_disabled/ ?

>
>Signed-off-by: Peng Hao <[email protected]>
>---
> arch/x86/kvm/lapic.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
>diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
>index 70dcb55..0380e37 100644
>--- a/arch/x86/kvm/lapic.c
>+++ b/arch/x86/kvm/lapic.c
>@@ -246,10 +246,9 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
>
> if (enabled != apic->sw_enabled) {
> apic->sw_enabled = enabled;
>- if (enabled) {
>+ if (enabled)
> static_key_slow_dec_deferred(&apic_sw_disabled);
>- recalculate_apic_map(apic->vcpu->kvm);
>- } else
>+ else
> static_key_slow_inc(&apic_sw_disabled.key);
> }
> }
>--
>1.8.3.1

--
Wei Yang
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