[PATCH] x86/sev: Fix host kdump support for SNP

[Kalra, Ashish]

On 8/29/2024 9:50 AM, Sean Christopherson wrote:

> On Thu, Aug 29, 2024, Borislav Petkov wrote:
>> On August 27, 2024 10:38:04 PM GMT+02:00, Ashish Kalra <Ashish.Kalra at amd.com> wrote:
>>> From: Ashish Kalra <ashish.kalra at amd.com>
>>>
>>> With active SNP VMs, SNP_SHUTDOWN_EX invoked during panic notifiers causes
>>> crashkernel boot failure with the following signature:
>> Why would SNP_SHUTDOWN be allowed *at all* if there are active SNP guests and
>> there's potential to lose guest data in the process?!
> Because if the host is panicking, guests are hosed regardless.  Unless I'm
> misreading things, the goal here is to ensure the crashkernel can actually capture
> a kdump.

Yes, that is the main goal here to ensure that crashkernel can boot and capture a kdump on a SNP enabled host regardless of SNP VMs running.

Thanks, Ashish