Re: [sos-linux-ext-patches] [PATCH v4 1/8] KVM: SEV: Disable SEV-SNP on FW validation failure

Pratik Rajesh Sampat
2025-01-10T21:50:55Z

Hi Nikunj,

On 1/9/25 11:21 PM, Nikunj A. Dadhania wrote:
>
>
> On 11/15/2024 5:10 AM, Pratik R. Sampat wrote:
>> On incompatible firmware versions, SEV-SNP support is pulled and the
>> setup is not performed. However, the platform and subsequently the KVM
>> capability may continue to advertize support for it. Disable support for
>> SEV-SNP if the FW version validation fails.
>
> Additionally, can we ensure that if sev_platform_init() fails, we do not
> indicate SNP support?

That sounds good to me. Although if the platform initialization fails,
I think we should not be advertising SEV, SEV-ES as well.

If that makes sense, we could do something similar to before by
exporting another function from ccp that returns whether the platform
is initialized. Then, within kvm's sev_hardware_setup(), we can check
this to ensure that none of the capabilities are set if the platform
initialization has failed?

Thanks!
Pratik