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SubjectRe: [PATCH v8 09/16] x86/cpufeatures: Add synthetic Secure TSC bit
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On 4/22/2024 6:55 PM, Borislav Petkov wrote:
> On Thu, Feb 15, 2024 at 05:01:21PM +0530, Nikunj A Dadhania wrote:
>> Add support for the synthetic CPUID flag which indicates that the SNP
>> guest is running with secure tsc enabled (MSR_AMD64_SEV Bit 11 -
>
> "TSC"

Sure

>
>> SecureTsc_Enabled) . This flag is there so that this capability in the
>> guests can be detected easily without reading MSRs every time accessors.
>
> Why?
>
> What's wrong with cc_platform_has(CC_ATTR_GUEST_SECURE_TSC) or so?
>

That was the initial implementation, and there were review comments[1] to
use synthetic flag.

Regards
Nikunj

1. https://lore.kernel.org/lkml/20231106130041.gqoqszdxrmdomsxl@box.shutemov.name/

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