linux-kernel - Re: [PATCH v5 1/3] efi/x86: skip efi_arch_mem

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Message-ID: <a1d80cce-28d1-48e8-bc38-8960d8c90774@amd.com>
Date: Fri, 26 Apr 2024 09:47:02 -0500
From: "Kalra, Ashish" <ashish.kalra@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
 x86@...nel.org, rafael@...nel.org, peterz@...radead.org,
 adrian.hunter@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
 jun.nakajima@...el.com, rick.p.edgecombe@...el.com, thomas.lendacky@....com,
 michael.roth@....com, seanjc@...gle.com, kai.huang@...el.com,
 bhe@...hat.com, kirill.shutemov@...ux.intel.com, bdas@...hat.com,
 vkuznets@...hat.com, dionnaglaze@...gle.com, anisinha@...hat.com,
 jroedel@...e.de, ardb@...nel.org, kexec@...ts.infradead.org,
 linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] efi/x86: skip efi_arch_mem_reserve() in case of
 kexec.

On 4/26/2024 9:21 AM, Borislav Petkov wrote:

> On Wed, Apr 24, 2024 at 04:17:09PM -0500, Kalra, Ashish wrote:
>> With SNP guest kexec and during nested guest kexec, observe the following
>> efi memmap corruption :
> Before we delve any deeper here, lemme make sure I understand this
> correctly:
>
> * You're in a SNP guest and you're kexec-ing into a new kernel?

Yes this is the case, where i am in a SNP guest and kexec-ing into a new 
kernel.

I should have mentioned *chained* guest kexec above instead of nested 
guest kexec.

Thanks, Ashish