Re: [PATCH 1/4] x86/hyperv: Add missing ARCH_HAS_CC_PLATFORM dependency

[Tianyu Lan]

On 2/23/2022 6:56 PM, Borislav Petkov wrote:
> On Wed, Feb 23, 2022 at 06:43:40PM +0800, Tianyu Lan wrote:
> > Hyper-V code check cpuid during runtime and there is no Hyper-V
> > isolation VM option.
>
> So how does "Current Hyper-V Isolation VM requires AMD_MEM_ENCRYPT" work
> exactly?
>
> Please explain in detail and not in piecemeal sentences.
The kernel in the image needs to select AMD_MEM_ENCRYPT option
otherwise the kernel can't boot up due to missing SEV support and
sev_es_ghcb_hv_call() always return error.