Re: `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN

[Tom Lendacky <thomas.lendacky@amd.com>]

On 10/6/21 1:36 PM, Alex Deucher wrote:
> On Wed, Oct 6, 2021 at 2:21 PM Borislav Petkov <bp@alien8.de> wrote:
>> On Wed, Oct 06, 2021 at 02:10:30PM -0400, Alex Deucher wrote:

> 
>  From the x86 model and family info?  I think Raven has different
> families from other Zen based CPUs.
> 
>> And even if we do, that's still not accurate enough - we wanna know
>> whether the IOMMU works.
> 
> Right.
> 
>>
>> So I guess we're all left to the user to decide. But I'm always open
>> to suggestions for solving things in sw and not requiring any user
>> interaction.
> 
> @Tom Lendacky Any ideas?

I think user decision is probably going to be best. We have to enable and 
encrypt the kernel for SME very early in boot, that, short of 
family/model/stepping checks, there's not a lot that we can do.

Thanks,
Tom

> 
> Alex
> 
>>
>>> Other than these comments, looks fine to me.
>>
>> Thx.
>>
>> --
>> Regards/Gruss,
>>      Boris.
>>
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