From: Binbin Wu <binbin.wu@linux.intel.com>
To: Peter Fang <peter.fang@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Kiryl Shutsemau <kas@kernel.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev,
kvm@vger.kernel.org, Xiaoyao Li <xiaoyao.li@intel.com>
Subject: Re: [PATCH v2 1/2] x86/tdx: Add helper to query maximum TD Quote size
Date: Wed, 22 Jul 2026 21:21:12 +0800 [thread overview]
Message-ID: <e083f203-684f-4ae2-81c5-39d9ff24629e@linux.intel.com> (raw)
In-Reply-To: <20260717214349.4075994-2-peter.fang@intel.com>
On 7/18/2026 5:43 AM, Peter Fang wrote:
> TDX attestation report ("Quote") sizes can grow with newer cryptographic
> schemes, so guests can no longer rely on a fixed-size buffer for the
> Quote.
>
> Newer TDX modules report the maximum Quote size via a TD-scope metadata
> field. Add a helper to query the size instead of exposing tdg_vm_rd()
> directly, as it can read arbitrary metadata fields.
>
> Thanks to Xu Yilun for suggesting this in an off-list discussion.
>
> Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Signed-off-by: Peter Fang <peter.fang@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
next prev parent reply other threads:[~2026-07-22 13:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-17 21:43 [PATCH v2 0/2] tdx-guest: Make Quote buffer size dynamic Peter Fang
2026-07-17 21:43 ` [PATCH v2 1/2] x86/tdx: Add helper to query maximum TD Quote size Peter Fang
2026-07-22 13:21 ` Binbin Wu [this message]
2026-07-17 21:43 ` [PATCH v2 2/2] virt: tdx-guest: Allocate Quote buffer dynamically Peter Fang
2026-07-20 13:35 ` Dave Hansen
2026-07-21 6:49 ` Peter Fang
2026-07-21 13:48 ` Dave Hansen
2026-07-21 16:43 ` Edgecombe, Rick P
2026-07-22 7:36 ` Peter Fang
2026-07-22 12:00 ` Kiryl Shutsemau
2026-07-22 6:39 ` Peter Fang
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