* [PATCH] KVM: VMX: Remove unnecessary exception trampoline in vmx_vmenter
@ 2020-04-06 15:16 Uros Bizjak
2020-04-06 16:28 ` Sean Christopherson
0 siblings, 1 reply; 2+ messages in thread
From: Uros Bizjak @ 2020-04-06 15:16 UTC (permalink / raw)
To: kvm; +Cc: Uros Bizjak, Sean Christopherson, Paolo Bonzini
The exception trampoline in .fixup section is not needed, the exception handling code can jump directly to the label in .text section.
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
arch/x86/kvm/vmx/vmenter.S | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 81ada2ce99e7..56d701db8734 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -58,12 +58,8 @@ SYM_FUNC_START(vmx_vmenter)
ret
4: ud2
- .pushsection .fixup, "ax"
-5: jmp 3b
- .popsection
-
- _ASM_EXTABLE(1b, 5b)
- _ASM_EXTABLE(2b, 5b)
+ _ASM_EXTABLE(1b, 3b)
+ _ASM_EXTABLE(2b, 3b)
SYM_FUNC_END(vmx_vmenter)
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] KVM: VMX: Remove unnecessary exception trampoline in vmx_vmenter
2020-04-06 15:16 [PATCH] KVM: VMX: Remove unnecessary exception trampoline in vmx_vmenter Uros Bizjak
@ 2020-04-06 16:28 ` Sean Christopherson
0 siblings, 0 replies; 2+ messages in thread
From: Sean Christopherson @ 2020-04-06 16:28 UTC (permalink / raw)
To: Uros Bizjak; +Cc: kvm, Paolo Bonzini
On Mon, Apr 06, 2020 at 05:16:41PM +0200, Uros Bizjak wrote:
> The exception trampoline in .fixup section is not needed, the exception handling code can jump directly to the label in .text section.
Changelog need to be wrapped at 75 chars, and "label in .text section"
should be "label in the .text section".
Nits aside,
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Cc: Sean Christopherson <sean.j.christopherson@intel.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
> ---
> arch/x86/kvm/vmx/vmenter.S | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
> index 81ada2ce99e7..56d701db8734 100644
> --- a/arch/x86/kvm/vmx/vmenter.S
> +++ b/arch/x86/kvm/vmx/vmenter.S
> @@ -58,12 +58,8 @@ SYM_FUNC_START(vmx_vmenter)
> ret
> 4: ud2
>
> - .pushsection .fixup, "ax"
> -5: jmp 3b
> - .popsection
> -
> - _ASM_EXTABLE(1b, 5b)
> - _ASM_EXTABLE(2b, 5b)
> + _ASM_EXTABLE(1b, 3b)
> + _ASM_EXTABLE(2b, 3b)
>
> SYM_FUNC_END(vmx_vmenter)
>
> --
> 2.25.1
>
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2020-04-06 15:16 [PATCH] KVM: VMX: Remove unnecessary exception trampoline in vmx_vmenter Uros Bizjak
2020-04-06 16:28 ` Sean Christopherson
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