Re: [PATCH] KVM: SVM: Clear VMCB save area instead of entire VMCB on shutdown intercept

[Shivansh Dhiman <shivansh.dhiman@amd.com>]

On 24-08-26 18:48, Shivansh Dhiman wrote:
> The AMD APM previously stated that after an intercepted shutdown, the
> entire VMCB state is undefined. In practice, only the save area is
> undefined and most of the control area remains valid. Revision 3.45 of
> the APM now makes this explicit:
> 
>   "After an intercepted shutdown, the VMCB control area is valid (with
>    the exception of offsets 60h, 61h, and 68h) and the VMCB state save
>    area is undefined."
> 
> KVM zeroes the entire VMCB before INITing the vCPU based on the old
> wording, discarding control area state that hardware preserves.
> 
> Clear only the save area and the three undefined control area fields
> (int_ctl[15:0] and int_state) in line with the updated APM.

Hi,

Gentle ping for reviewing/merging this patch for VMCB save area
clearing on a shutdown intercept. Would appreciate any feedback or
guidance on next steps.

Thanks,
Shivansh