* [PATCH] KVM: VMX: Add 'else' to split mutually exclusive case
@ 2020-02-13 2:35 linmiaohe
2020-02-17 9:34 ` Vitaly Kuznetsov
0 siblings, 1 reply; 3+ messages in thread
From: linmiaohe @ 2020-02-13 2:35 UTC (permalink / raw)
To: pbonzini, rkrcmar, sean.j.christopherson, vkuznets, wanpengli,
jmattson, joro, tglx, mingo, bp, hpa
Cc: linmiaohe, kvm, linux-kernel, x86
From: Miaohe Lin <linmiaohe@huawei.com>
Each if branch in handle_external_interrupt_irqoff() is mutually
exclusive. Add 'else' to make it clear and also avoid some unnecessary
check.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
arch/x86/kvm/vmx/vmx.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9a6664886f2e..bb5c33440af8 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6178,13 +6178,11 @@ static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx)
/* if exit due to PF check for async PF */
if (is_page_fault(vmx->exit_intr_info))
vmx->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
-
/* Handle machine checks before interrupts are enabled */
- if (is_machine_check(vmx->exit_intr_info))
+ else if (is_machine_check(vmx->exit_intr_info))
kvm_machine_check();
-
/* We need to handle NMIs before interrupts are enabled */
- if (is_nmi(vmx->exit_intr_info)) {
+ else if (is_nmi(vmx->exit_intr_info)) {
kvm_before_interrupt(&vmx->vcpu);
asm("int $2");
kvm_after_interrupt(&vmx->vcpu);
--
2.19.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] KVM: VMX: Add 'else' to split mutually exclusive case
2020-02-13 2:35 [PATCH] KVM: VMX: Add 'else' to split mutually exclusive case linmiaohe
@ 2020-02-17 9:34 ` Vitaly Kuznetsov
0 siblings, 0 replies; 3+ messages in thread
From: Vitaly Kuznetsov @ 2020-02-17 9:34 UTC (permalink / raw)
To: linmiaohe
Cc: kvm, linux-kernel, x86, pbonzini, rkrcmar, sean.j.christopherson,
wanpengli, jmattson, joro, tglx, mingo, bp, hpa
linmiaohe <linmiaohe@huawei.com> writes:
> From: Miaohe Lin <linmiaohe@huawei.com>
>
> Each if branch in handle_external_interrupt_irqoff() is mutually
> exclusive. Add 'else' to make it clear and also avoid some unnecessary
> check.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> arch/x86/kvm/vmx/vmx.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 9a6664886f2e..bb5c33440af8 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -6178,13 +6178,11 @@ static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx)
> /* if exit due to PF check for async PF */
> if (is_page_fault(vmx->exit_intr_info))
> vmx->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
> -
> /* Handle machine checks before interrupts are enabled */
> - if (is_machine_check(vmx->exit_intr_info))
> + else if (is_machine_check(vmx->exit_intr_info))
> kvm_machine_check();
> -
> /* We need to handle NMIs before interrupts are enabled */
> - if (is_nmi(vmx->exit_intr_info)) {
> + else if (is_nmi(vmx->exit_intr_info)) {
We'll need to add braces to all branches of the statement,
if (is_page_fault(vmx->exit_intr_info)) {
} else if (is_machine_check(vmx->exit_intr_info)) {
} else if (is_nmi(vmx->exit_intr_info)) {
}
then.
> kvm_before_interrupt(&vmx->vcpu);
> asm("int $2");
> kvm_after_interrupt(&vmx->vcpu);
--
Vitaly
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] KVM: VMX: Add 'else' to split mutually exclusive case
@ 2020-02-17 9:41 linmiaohe
0 siblings, 0 replies; 3+ messages in thread
From: linmiaohe @ 2020-02-17 9:41 UTC (permalink / raw)
To: Vitaly Kuznetsov
Cc: kvm, linux-kernel, x86, pbonzini, rkrcmar, sean.j.christopherson,
wanpengli, jmattson, joro, tglx, mingo, bp, hpa
Vitaly Kuznetsov <vkuznets@redhat.com> writes:
>linmiaohe <linmiaohe@huawei.com> writes:
>
>
>We'll need to add braces to all branches of the statement,
>
> if (is_page_fault(vmx->exit_intr_info)) {
>
> } else if (is_machine_check(vmx->exit_intr_info)) {
>
> } else if (is_nmi(vmx->exit_intr_info)) {
>
> }
>
>then.
Will do. Thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-02-13 2:35 [PATCH] KVM: VMX: Add 'else' to split mutually exclusive case linmiaohe
2020-02-17 9:34 ` Vitaly Kuznetsov
2020-02-17 9:41 linmiaohe
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