Re: [PATCH v3 07/26] x86/virt/seamldr: Introduce a wrapper for P-SEAMLDR SEAMCALLs

[Chao Gao]

On Wed, Jan 28, 2026 at 03:04:55PM -0800, Dave Hansen wrote:
>On 1/23/26 06:55, Chao Gao wrote:
>> SEAMRET from the P-SEAMLDR clears the current VMCS structure pointed 
>> to by the current-VMCS pointer. A VMM that invokes the P-SEAMLDR
>> using SEAMCALL must reload the current-VMCS, if required, using the
>> VMPTRLD instruction.
>
>That seems pretty mean.
>
>This is going to need a lot more justification for why this is an
>absolutely necessary requirement.

AFAIK, this is a CPU implementation issue. The actual requirement is to
evict (flush and invalidate) all VMCSs __cached in SEAM mode__, but big
cores implement this by evicting the __entire__ VMCS cache. So, the
current VMCS is invalidated and cleared.

>
>KVM folks, are you OK with this?