linux-kernel - Re: [PATCHv2 2/2] x86/mm: Make memremap(MEMREMAP

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Message-ID: <20241118164616.GAZztvWGs9cOV8t20_@fat_crate.local>
Date: Mon, 18 Nov 2024 17:46:16 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrea Parri <parri.andrea@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Chan <ericchancf@...gle.com>, Jason Gunthorpe <jgg@...pe.ca>,
	Kai Huang <kai.huang@...el.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Russell King <linux@...linux.org.uk>,
	Samuel Holland <samuel.holland@...ive.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Yuntao Wang <ytcoode@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Tom Lendacky <thomas.lendacky@....com>,
	Ashish Kalra <ashish.kalra@....com>,
	"Maciej W. Rozycki" <macro@...am.me.uk>
Subject: Re: [PATCHv2 2/2] x86/mm: Make memremap(MEMREMAP_WB) map memory as
 encrypted by default

On Mon, Oct 21, 2024 at 01:57:23PM +0300, Kirill A. Shutemov wrote:
> It fixes crash on kexec in TDX guests if CONFIG_EISA is enabled.

Do TDX guests even need EISA?

"The EISA bus saw limited use between 1988 and 1995 when it was made obsolete
by the PCI bus."

Sounds like no to me.

We usually simply stop coco guests from touching such legacy ranges:

f30470c190c2 ("x86/boot: Skip video memory access in the decompressor for SEV-ES/SNP")

so can you do that too?

Thx.

-- 
Regards/Gruss,
    Boris.

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