linux-kernel - [PATCH 10/20] x86/tdx: Convert GET_QUOTE hypercall to use new TDVMCALL macros

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Date: Fri, 17 May 2024 17:19:28 +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 10/20] x86/tdx: Convert GET_QUOTE hypercall to use new TDVMCALL macros

Use newly introduced TDVMCALL_0() instead of __tdx_hypercall() to issue
GET_QUOTE hypercall.

It cuts code bloat substantially:

Function                                     old     new   delta
tdx_hcall_get_quote                          188      76    -112

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/coco/tdx/tdx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 7c874a50a319..3f0be1d3cccb 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -150,7 +150,8 @@ EXPORT_SYMBOL_GPL(tdx_mcall_get_report0);
 u64 tdx_hcall_get_quote(u8 *buf, size_t size)
 {
 	/* Since buf is a shared memory, set the shared (decrypted) bits */
-	return _tdx_hypercall(TDVMCALL_GET_QUOTE, cc_mkdec(virt_to_phys(buf)), size, 0, 0);
+	return TDVMCALL_0(TDVMCALL_GET_QUOTE,
+			  cc_mkdec(virt_to_phys(buf)), size, 0, 0);
 }
 EXPORT_SYMBOL_GPL(tdx_hcall_get_quote);
 
-- 
2.43.0