Re: [PATCH v4 4/4] x86/sev: Add SNP-specific unaccepted memory support

[Dionna Amalie Glaze]

>
> Add SNP-specific hooks to the unaccepted memory support in the boot
> path (__accept_memory()) and the core kernel (accept_memory()) in order
> to support booting SNP guests when unaccepted memory is present. Without
> this support, SNP guests will fail to boot and/or panic() when unaccepted
> memory is present in the EFI memory map.
>
> The process of accepting memory under SNP involves invoking the hypervisor
> to perform a page state change for the page to private memory and then
> issuing a PVALIDATE instruction to accept the page.

Thanks for this update! Tests show the boot performance shaves off a
good few seconds over eager acceptance, and it'll get better when we
have on-demand pinning.

The uncaught #VC exception is still there for 256GB machines and larger though.

-- 
-Dionna Glaze, PhD (she/her)