linux-kernel - Re: [PATCH] x86/sev: Apply RMP table fixups for kexec.

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Message-ID: <20240402174540.GAZgxERNxsRJUCb1yp@fat_crate.local>
Date: Tue, 2 Apr 2024 19:45:40 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Kalra, Ashish" <ashish.kalra@....com>
Cc: bp@...nel.org, thomas.lendacky@....com, linux-kernel@...r.kernel.org,
	linux-tip-commits@...r.kernel.org, michael.roth@....com,
	x86@...nel.org
Subject: Re: [PATCH] x86/sev: Apply RMP table fixups for kexec.

On Tue, Apr 02, 2024 at 12:11:03PM -0500, Kalra, Ashish wrote:
> > And if you mean the reservation in the kernel page tables (directmap)
> > then that will not help as kexec uses it's own identity mapped page
> > tables.

So how hard would it be to *always* reserve the chunk of memory at the
2M boundary where the RMP table starts and up to the 2M boundary where
the RMP  table ends?

In *every* kernel.

By default.

Thx.

-- 
Regards/Gruss,
    Boris.

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