linux-kernel - Re: [PATCH] x86/coco, x86/sev: Use cpu_feature

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Date: Tue, 2 Jan 2024 15:22:33 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Tom Lendacky <thomas.lendacky@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/coco, x86/sev: Use cpu_feature_enabled() to detect
 SEV guest flavor

On Tue, Dec 05, 2023 at 09:33:37PM +0100, Borislav Petkov wrote:
> On Tue, Dec 05, 2023 at 07:52:41PM +0100, Borislav Petkov wrote:
> > So yes, we will fix your issue, no worries. I'm figuring out the
> > details as we speak.
> 
> So you can do for the short term:
> 
> ---
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index c461c1a4b6af..f8999f6d1b00 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -434,7 +434,7 @@ static void __init sev_map_percpu_data(void)
>  {
>  	int cpu;
>  
> -	if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
> +	if (cc_vendor != CC_VENDOR_AMD || !cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
>  		return;
>  
>  	for_each_possible_cpu(cpu) {
> ---
> 
> until we've sorted out the bigger picture.

So, there seems no movement on the issue.

Borislav, could you share your view on the bigger picture. I can try to
implement it.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov