linux-kernel - Re: [PATCH 06/20] x86/tdx: Convert MSR write handling to use new TDVMCALL

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Message-ID: <ZlVsurj64QycDQRr@liuwe-devbox-debian-v2>
Date: Tue, 28 May 2024 05:33:46 +0000
From: Wei Liu <wei.liu@...nel.org>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.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>, linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 06/20] x86/tdx: Convert MSR write handling to use new
 TDVMCALL_0()

On Fri, May 17, 2024 at 05:19:24PM +0300, Kirill A. Shutemov wrote:
> Use newly introduced TDVMCALL_0() instead of __tdx_hypercall() to handle
> MSR write emulation.
> 
> It cuts code bloat substantially:
> 
> Function                                     old     new   delta
> tdx_handle_virt_exception                   1947    1819    -128
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/x86/coco/tdx/tdx.c | 9 ++-------
>  arch/x86/hyperv/ivm.c   | 9 ++-------

Acked-by: Wei Liu <wei.liu@...nel.org>