linux-kernel - Re: [PATCH, RESEND] x86/sev: Fix SEV check in sev_map_percpu

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Date: Fri, 2 Feb 2024 12:30:29 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>, 
	Wanpeng Li <wanpengli@...cent.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, 
	Sean Christopherson <seanjc@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	David Rientjes <rientjes@...gle.com>, llvm@...ts.linux.dev
Subject: Re: [PATCH, RESEND] x86/sev: Fix SEV check in sev_map_percpu_data()

On Thu, Feb 01, 2024 at 12:38:09PM -0700, Nathan Chancellor wrote:
> Perhaps another solution would be to just
> 
>   #define cc_vendor (CC_VENDOR_NONE)
> 
> if CONFIG_ARCH_HAS_CC_PLATFORM is not set, since it can never be changed
> from the default in arch/x86/coco/core.c.

I think this approach is cleaner.

Could you post a proper patch?

> 
> diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h
> index 6ae2d16a7613..f3909894f82f 100644
> --- a/arch/x86/include/asm/coco.h
> +++ b/arch/x86/include/asm/coco.h
> @@ -10,13 +10,13 @@ enum cc_vendor {
>  	CC_VENDOR_INTEL,
>  };
>  
> -extern enum cc_vendor cc_vendor;
> -
>  #ifdef CONFIG_ARCH_HAS_CC_PLATFORM
> +extern enum cc_vendor cc_vendor;
>  void cc_set_mask(u64 mask);
>  u64 cc_mkenc(u64 val);
>  u64 cc_mkdec(u64 val);
>  #else
> +#define cc_vendor (CC_VENDOR_NONE)
>  static inline u64 cc_mkenc(u64 val)
>  {
>  	return val;
> 
> Cheers,
> Nathan
> 

-- 
  Kiryl Shutsemau / Kirill A. Shutemov