* [PATCH] KVM: x86: eliminate some unreachable code
@ 2020-02-13 2:53 linmiaohe
2020-02-13 18:53 ` Krish Sadhukhan
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: linmiaohe @ 2020-02-13 2:53 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>
These code are unreachable, remove them.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
arch/x86/kvm/vmx/vmx.c | 1 -
arch/x86/kvm/x86.c | 3 ---
2 files changed, 4 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index bb5c33440af8..b6d4eafe01cf 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4505,7 +4505,6 @@ static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
case GP_VECTOR:
case MF_VECTOR:
return true;
- break;
}
return false;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fbabb2f06273..a597009aefd7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3081,7 +3081,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
break;
case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
- break;
case MSR_IA32_TSCDEADLINE:
msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
break;
@@ -3164,7 +3163,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return kvm_hv_get_msr_common(vcpu,
msr_info->index, &msr_info->data,
msr_info->host_initiated);
- break;
case MSR_IA32_BBL_CR_CTL3:
/* This legacy MSR exists but isn't fully documented in current
* silicon. It is however accessed by winxp in very narrow
@@ -8471,7 +8469,6 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
break;
default:
return -EINTR;
- break;
}
return 1;
}
--
2.19.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] KVM: x86: eliminate some unreachable code
2020-02-13 2:53 [PATCH] KVM: x86: eliminate some unreachable code linmiaohe
@ 2020-02-13 18:53 ` Krish Sadhukhan
2020-02-17 16:16 ` Vitaly Kuznetsov
2020-02-17 17:11 ` Paolo Bonzini
2 siblings, 0 replies; 5+ messages in thread
From: Krish Sadhukhan @ 2020-02-13 18:53 UTC (permalink / raw)
To: linmiaohe, pbonzini, rkrcmar, sean.j.christopherson, vkuznets,
wanpengli, jmattson, joro, tglx, mingo, bp, hpa
Cc: kvm, linux-kernel, x86
On 2/12/20 6:53 PM, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@huawei.com>
>
> These code are unreachable, remove them.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> arch/x86/kvm/vmx/vmx.c | 1 -
> arch/x86/kvm/x86.c | 3 ---
> 2 files changed, 4 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index bb5c33440af8..b6d4eafe01cf 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4505,7 +4505,6 @@ static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
> case GP_VECTOR:
> case MF_VECTOR:
> return true;
> - break;
> }
> return false;
> }
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fbabb2f06273..a597009aefd7 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3081,7 +3081,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> break;
> case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
> return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
> - break;
> case MSR_IA32_TSCDEADLINE:
> msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
> break;
> @@ -3164,7 +3163,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> return kvm_hv_get_msr_common(vcpu,
> msr_info->index, &msr_info->data,
> msr_info->host_initiated);
> - break;
> case MSR_IA32_BBL_CR_CTL3:
> /* This legacy MSR exists but isn't fully documented in current
> * silicon. It is however accessed by winxp in very narrow
> @@ -8471,7 +8469,6 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
> break;
> default:
> return -EINTR;
> - break;
> }
> return 1;
> }
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] KVM: x86: eliminate some unreachable code
2020-02-13 2:53 [PATCH] KVM: x86: eliminate some unreachable code linmiaohe
2020-02-13 18:53 ` Krish Sadhukhan
@ 2020-02-17 16:16 ` Vitaly Kuznetsov
2020-02-17 17:11 ` Paolo Bonzini
2 siblings, 0 replies; 5+ messages in thread
From: Vitaly Kuznetsov @ 2020-02-17 16:16 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>
>
> These code are unreachable, remove them.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> arch/x86/kvm/vmx/vmx.c | 1 -
> arch/x86/kvm/x86.c | 3 ---
> 2 files changed, 4 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index bb5c33440af8..b6d4eafe01cf 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4505,7 +4505,6 @@ static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
> case GP_VECTOR:
> case MF_VECTOR:
> return true;
> - break;
> }
> return false;
> }
Unrelated to your change but what I don't in rmode_exception() is the
second "/* fall through */" instead of just 'return true;', it makes it
harder to read.
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fbabb2f06273..a597009aefd7 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3081,7 +3081,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> break;
> case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
> return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
> - break;
> case MSR_IA32_TSCDEADLINE:
> msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
> break;
> @@ -3164,7 +3163,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> return kvm_hv_get_msr_common(vcpu,
> msr_info->index, &msr_info->data,
> msr_info->host_initiated);
> - break;
> case MSR_IA32_BBL_CR_CTL3:
> /* This legacy MSR exists but isn't fully documented in current
> * silicon. It is however accessed by winxp in very narrow
> @@ -8471,7 +8469,6 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
> break;
> default:
> return -EINTR;
> - break;
> }
> return 1;
> }
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
--
Vitaly
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] KVM: x86: eliminate some unreachable code
2020-02-13 2:53 [PATCH] KVM: x86: eliminate some unreachable code linmiaohe
2020-02-13 18:53 ` Krish Sadhukhan
2020-02-17 16:16 ` Vitaly Kuznetsov
@ 2020-02-17 17:11 ` Paolo Bonzini
2 siblings, 0 replies; 5+ messages in thread
From: Paolo Bonzini @ 2020-02-17 17:11 UTC (permalink / raw)
To: linmiaohe, rkrcmar, sean.j.christopherson, vkuznets, wanpengli,
jmattson, joro, tglx, mingo, bp, hpa
Cc: kvm, linux-kernel, x86
On 13/02/20 03:53, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@huawei.com>
>
> These code are unreachable, remove them.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> arch/x86/kvm/vmx/vmx.c | 1 -
> arch/x86/kvm/x86.c | 3 ---
> 2 files changed, 4 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index bb5c33440af8..b6d4eafe01cf 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4505,7 +4505,6 @@ static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
> case GP_VECTOR:
> case MF_VECTOR:
> return true;
> - break;
> }
> return false;
> }
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fbabb2f06273..a597009aefd7 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3081,7 +3081,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> break;
> case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
> return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
> - break;
> case MSR_IA32_TSCDEADLINE:
> msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
> break;
> @@ -3164,7 +3163,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> return kvm_hv_get_msr_common(vcpu,
> msr_info->index, &msr_info->data,
> msr_info->host_initiated);
> - break;
> case MSR_IA32_BBL_CR_CTL3:
> /* This legacy MSR exists but isn't fully documented in current
> * silicon. It is however accessed by winxp in very narrow
> @@ -8471,7 +8469,6 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
> break;
> default:
> return -EINTR;
> - break;
> }
> return 1;
> }
>
Queued, thanks.
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] KVM: x86: eliminate some unreachable code
@ 2020-02-18 1:19 linmiaohe
0 siblings, 0 replies; 5+ messages in thread
From: linmiaohe @ 2020-02-18 1:19 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:
>
>> @@ -4505,7 +4505,6 @@ static bool rmode_exception(struct kvm_vcpu *vcpu, int vec)
>> case GP_VECTOR:
>> case MF_VECTOR:
>> return true;
>> - break;
>> }
>> return false;
>> }
>
>Unrelated to your change but what I don't in rmode_exception() is the second "/* fall through */" instead of just 'return true;', it makes it harder to read.
Agree. I will do it in another patch as it's unrelated to this one. Many Thanks for your review and advice.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-02-18 1:19 UTC | newest]
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2020-02-13 2:53 [PATCH] KVM: x86: eliminate some unreachable code linmiaohe
2020-02-13 18:53 ` Krish Sadhukhan
2020-02-17 16:16 ` Vitaly Kuznetsov
2020-02-17 17:11 ` Paolo Bonzini
2020-02-18 1:19 linmiaohe
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