linux-kernel - [PATCH 15/20] x86/tdx: Convert PAGE_ACCEPT tdcall to use new TDCALL

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Date: Fri, 17 May 2024 17:19:33 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: 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>
Cc: linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 15/20] x86/tdx: Convert PAGE_ACCEPT tdcall to use new TDCALL_0() macro

Use newly introduced TDCALL_0() instead of __tdcall() to issue
PAGE_ACCEPT tdcall.

It cuts code bloat substantially:

Function                                     old     new   delta
tdx_accept_memory                            592     233    -359

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/coco/tdx/tdx-shared.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx-shared.c b/arch/x86/coco/tdx/tdx-shared.c
index 1655aa56a0a5..9104e96eeefd 100644
--- a/arch/x86/coco/tdx/tdx-shared.c
+++ b/arch/x86/coco/tdx/tdx-shared.c
@@ -5,8 +5,8 @@ static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
 				    enum pg_level pg_level)
 {
 	unsigned long accept_size = page_level_size(pg_level);
-	struct tdx_module_args args = {};
 	u8 page_size;
+	u64 ret;
 
 	if (!IS_ALIGNED(start, accept_size))
 		return 0;
@@ -34,8 +34,8 @@ static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
 		return 0;
 	}
 
-	args.rcx = start | page_size;
-	if (__tdcall(TDG_MEM_PAGE_ACCEPT, &args))
+	ret = TDCALL_0(TDG_MEM_PAGE_ACCEPT, start | page_size, 0, 0, 0);
+	if (ret)
 		return 0;
 
 	return accept_size;
-- 
2.43.0