linux-kernel - Re: [PATCH v3 0/2] x86: enforce and cleanup RIP-relative accesses in early boot code

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Message-ID: <20240131182944.GJZbqRmBN_KDgK_nmB@fat_crate.local>
Date: Wed, 31 Jan 2024 19:29:44 +0100
From: Borislav Petkov <bp@...en8.de>
To: Jacob Xu <jacobhxu@...gle.com>
Cc: Kevin Loughlin <kevinloughlin@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Pankaj Gupta <pankaj.gupta@....com>,
	Hou Wenlong <houwenlong.hwl@...group.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Dionna Glaze <dionnaglaze@...gle.com>,
	Brijesh Singh <brijesh.singh@....com>,
	Michael Roth <michael.roth@....com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	linux-coco@...ts.linux.dev, Ashish Kalra <ashish.kalra@....com>,
	Andi Kleen <ak@...ux.intel.com>, Adam Dunlap <acdunlap@...gle.com>,
	Peter Gonda <pgonda@...gle.com>,
	Sidharth Telang <sidtelang@...gle.com>
Subject: Re: [PATCH v3 0/2] x86: enforce and cleanup RIP-relative accesses in
 early boot code

On Wed, Jan 31, 2024 at 10:16:55AM -0800, Jacob Xu wrote:
> We're interested in fixing SEV-SNP guest boots which are currently
> broken when using a guest kernel compiled with clang. It seems like
> every other user of SEV/SNP linux kernel code uses GCC to compile the
> kernel so they've avoided this issue.

Lemme give that a try here.

> E.g. Google COS uses clang to compile the kernel and we've made do
> with an internal fix for a while. 

Which means that, theoretically, you could forward-port this internal
fix until the issue is fixed for real, I'd say.

-- 
Regards/Gruss,
    Boris.

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