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

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Message-ID: <20240426142119.GEZiu4X8VPK5He4zH1@fat_crate.local>
Date: Fri, 26 Apr 2024 16:21:19 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Kalra, Ashish" <ashish.kalra@....com>
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 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?

or

* You have a plain hypervisor which runs a non-CoCo guest and that guest
is a hypervisor too and it starts a level 2 guest and *in* *that* level
2 guest you kexec a kernel?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette