linux-kernel - Re: [PATCH] x86/kvm/tdx: Save %rbp in TDX_MODULE

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Message-ID: <f7edef9c-5eb5-4664-a193-3bb063674742@intel.com>
Date: Fri, 17 May 2024 08:52:26 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Juergen Gross <jgross@...e.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, linux-coco@...ts.linux.dev,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/kvm/tdx: Save %rbp in TDX_MODULE_CALL

On 5/17/24 08:48, Juergen Gross wrote:
> Is the BIOS version printed at boot enough to see what I have?
> 
> [    0.000000] DMI: Intel Corporation D50DNP/D50DNP, BIOS
> SE5C7411.86B.9535.D04.2312270518 12/27/2023

I honestly don't know.

What we actually need is the TDX module version. I'm not sure how
tightly tied the TDX module is to the BIOS version. I suspect that
they're actually completely independent.

Once we have the specific TDX module version, we can go ask the folks
who write it if there were any RBP clobbering bugs.