linux-kernel - Re: [PATCH v4 0/9] x86/sev: KEXEC/KDUMP support for SEV-ES guests

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Message-ID: <a82d24f8-d185-47a7-91df-4706658843e5@amd.com>
Date: Tue, 12 Mar 2024 11:13:54 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Vasant Karasulli <vkarasulli@...e.de>
Cc: Vasant k <vsntk18@...il.com>, x86@...nel.org, joro@...tes.org,
 cfir@...gle.com, dan.j.williams@...el.com, dave.hansen@...ux.intel.com,
 ebiederm@...ssion.com, erdemaktas@...gle.com, hpa@...or.com,
 jgross@...e.com, jslaby@...e.cz, keescook@...omium.org,
 kexec@...ts.infradead.org, kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, luto@...nel.org, martin.b.radev@...il.com,
 mhiramat@...nel.org, mstunes@...are.com, nivedita@...m.mit.edu,
 peterz@...radead.org, rientjes@...gle.com, seanjc@...gle.com,
 stable@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 0/9] x86/sev: KEXEC/KDUMP support for SEV-ES guests

On 3/12/24 10:16, Vasant Karasulli wrote:
> On Di 12-03-24 09:04:13, Tom Lendacky wrote:
>> On 3/11/24 15:32, Vasant k wrote:
>>> Hi Tom,
>>>
>>>          Right,  it just escaped my mind that the SNP uses the secrets page
>>> to hand over APs to the next stage.  I will correct that in the next
>>
>> Not quite... The MADT table lists the APs and the GHCB AP Create NAE event
>> is used to start the APs.
> 
> Alright. So AP Jump Table is not used like in the case of SEV-ES. Thanks,

Right. It can be, but we don't use that method in Linux.

Thanks,
Tom

> I will keep the changes in the patch set exclusively for SEV-ES then.
> 
> - Vasant