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

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Message-ID: <20240203101927.GEZb4TL2H3XTqCSo5d@fat_crate.local>
Date: Sat, 3 Feb 2024 11:19:27 +0100
From: Borislav Petkov <bp@...en8.de>
To: Kevin Loughlin <kevinloughlin@...gle.com>
Cc: Jacob Xu <jacobhxu@...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 Fri, Feb 02, 2024 at 04:22:02PM -0800, Kevin Loughlin wrote:
> True. I just think it would be better to have an upstream fix for
> clang builds of SEV-SNP guests; I believe the first such SEV-SNP code
> was merged in 5.19 if I'm not mistaken.

SNP host support is not upstream yet. So we'd be supporting something
which is out-of-tree. Lemme see how ugly it'll get...

-- 
Regards/Gruss,
    Boris.

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