linux-kernel - Re: [PATCH v5 4/5] x86/tdx: tdx_mcall_get_report0: Return -EBUSY on TDCALL_OPERAND

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Message-ID: <13b76cda-4fa9-4a00-a923-6a842275e555@intel.com>
Date: Thu, 1 May 2025 10:36:18 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Cedric Xing <cedric.xing@...el.com>,
 Dan Williams <dan.j.williams@...el.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
 Dionna Amalie Glaze <dionnaglaze@...gle.com>,
 Guorui Yu <guorui.yu@...ux.alibaba.com>,
 James Bottomley <James.Bottomley@...senPartnership.com>,
 Dan Middleton <dan.middleton@...ux.intel.com>,
 Mikko Ylinen <mikko.ylinen@...ux.intel.com>,
 Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH v5 4/5] x86/tdx: tdx_mcall_get_report0: Return -EBUSY on
 TDCALL_OPERAND_BUSY error

On 4/24/25 13:12, Cedric Xing wrote:
> Return `-EBUSY` from tdx_mcall_get_report0() when `TDG.MR.REPORT` returns
> `TDCALL_OPERAND_BUSY`. This enables the caller to retry obtaining a
> TDREPORT later if another VCPU is extending an RTMR concurrently.
I would appreciate if someone can go back and look at centralizing the
TDX error code => errno conversions. But that doesn't need to happen now.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>