linux-kernel - Re: [PATCH v3 16/16] objtool: Validate kCFI calls

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Message-ID: <aIKZnSuTXn9thrf7@google.com>
Date: Thu, 24 Jul 2025 13:37:49 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org, kys@...rosoft.com, haiyangz@...rosoft.com, 
	wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com, 
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, pbonzini@...hat.com, 
	ardb@...nel.org, kees@...nel.org, Arnd Bergmann <arnd@...db.de>, 
	gregkh@...uxfoundation.org, jpoimboe@...nel.org, linux-hyperv@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, linux-efi@...r.kernel.org, 
	samitolvanen@...gle.com, ojeda@...nel.org
Subject: Re: [PATCH v3 16/16] objtool: Validate kCFI calls

On Mon, Jul 14, 2025, Peter Zijlstra wrote:
> --- a/arch/x86/kvm/vmx/vmenter.S
> +++ b/arch/x86/kvm/vmx/vmenter.S
> @@ -361,6 +361,10 @@ SYM_FUNC_END(vmread_error_trampoline)
>  
>  .section .text, "ax"
>  
> +#ifndef CONFIG_X86_FRED
> +
>  SYM_FUNC_START(vmx_do_interrupt_irqoff)
>  	VMX_DO_EVENT_IRQOFF CALL_NOSPEC _ASM_ARG1
>  SYM_FUNC_END(vmx_do_interrupt_irqoff)
> +
> +#endif

This can go in the previous patch, "x86/fred: KVM: VMX: Always use FRED for IRQs
when CONFIG_X86_FRED=y".