linux-kernel - Re: [PATCH v11 06/20] x86/sev: Handle failures from snp

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Message-ID: <94899c78-97e3-230a-a7eb-d4d448d9fa75@amd.com>
Date: Wed, 28 Aug 2024 15:46:23 +0530
From: "Nikunj A. Dadhania" <nikunj@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, thomas.lendacky@....com, x86@...nel.org,
 kvm@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
 dave.hansen@...ux.intel.com, pgonda@...gle.com, seanjc@...gle.com,
 pbonzini@...hat.com
Subject: Re: [PATCH v11 06/20] x86/sev: Handle failures from snp_init()

On 8/28/2024 3:19 PM, Borislav Petkov wrote:
> On Wed, Aug 28, 2024 at 10:17:57AM +0530, Nikunj A. Dadhania wrote:
>> +	if ((snp && !snp_enabled) ||
>> +	    (!snp && snp_enabled))
>>  		snp_abort();
> 
> And which boolean function is that?

Ah.. missed that.

>  	/*
> -	 * The SEV-SNP CC blob should be present and parsing CC blob should
> -	 * succeed when SEV-SNP is enabled.
> +	 * Any discrepancies between the presence of a CC blob and SNP
> +	 * enablement abort the guest.
>  	 */
> -	if (!snp && (msr & MSR_AMD64_SEV_SNP_ENABLED))
> +	if (snp_en ^ (msr & MSR_AMD64_SEV_SNP_ENABLED))
>  		snp_abort();
>  
>  	/* Check if memory encryption is enabled */
> 

Do you want me to send the patch again with above change?

Regards
Nikunj