linux-kernel - Re: [PATCH 14/20] x86/tdx: Add macros to generate TDCALL wrappers

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Date: Fri, 17 May 2024 19:04:49 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 Sean Christopherson <seanjc@...gle.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>, "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>
Cc: linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 14/20] x86/tdx: Add macros to generate TDCALL wrappers

On 5/17/24 16:19, Kirill A. Shutemov wrote:
> Introduce a set of macros that allow to generate wrappers for TDCALL
> leafs.
> 
> There are three macros differentiated by number of return parameters.
> 
> Signed-off-by: Kirill A. Shutemov<kirill.shutemov@...ux.intel.com>
> ---
>   arch/x86/include/asm/shared/tdx.h | 58 +++++++++++++++++++++++++++++++
>   1 file changed, 58 insertions(+)

Can you explain in the commit message why you picked a different 
approach?  That is, a sequence of inlined movq instructions here vs. 
compiler-generated movqs + a trampoline for TDVMCALL.

Paolo