linux-kernel - Re: [PATCHv3 2/2] x86/mm: Make memremap(MEMREMAP

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Message-ID: <20250113205539.GIZ4V9y8qq-45uVEcV@fat_crate.local>
Date: Mon, 13 Jan 2025 21:55:39 +0100
From: Borislav Petkov <bp@...en8.de>
To: Tom Lendacky <thomas.lendacky@....com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	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, stable@...r.kernel.org,
	Ashish Kalra <ashish.kalra@....com>,
	"Maciej W. Rozycki" <macro@...am.me.uk>
Subject: Re: [PATCHv3 2/2] x86/mm: Make memremap(MEMREMAP_WB) map memory as
 encrypted by default

On Mon, Jan 13, 2025 at 02:47:56PM -0600, Tom Lendacky wrote:
> This patch causes my bare-metal system to crash during boot when using
> mem_encrypt=on:
> 
> [    2.392934] efi: memattr: Entry type should be RuntimeServiceCode/Data
> [    2.393731] efi: memattr: ! 0x214c42f01f1162a-0xee70ac7bd1a9c629 [type=2028324321|attr=0x6590648fa4209879]
> [    2.394733] BUG: unable to handle page fault for address: ffffc900b4669017

A wild guess: looks like it tries to map EFI memory encrypted now...

Anyway, lemme zap. Those will have to go through the full motions of testing.

-- 
Regards/Gruss,
    Boris.

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