linux-kernel - [PATCH 09/20] x86/tdx: Convert MAP_GPA hypercall to use new TDVMCALL macros

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Date: Fri, 17 May 2024 17:19:27 +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 09/20] x86/tdx: Convert MAP_GPA hypercall to use new TDVMCALL macros

Use newly introduced TDVMCALL_1() instead of __tdx_hypercall() to issue
MAP_GPA hypercall.

It cuts code bloat substantially:

Function                                     old     new   delta
tdx_enc_status_changed                       352     242    -110
tdx_kexec_finish                             645     530    -115
tdx_enc_status_change_prepare                326     181    -145
Total: Before=5553, After=5183, chg -6.66%

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/coco/tdx/tdx.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index df3e10d899b3..7c874a50a319 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -797,15 +797,10 @@ static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc)
 	}
 
 	while (retry_count < max_retries_per_page) {
-		struct tdx_module_args args = {
-			.r10 = TDX_HYPERCALL_STANDARD,
-			.r11 = TDVMCALL_MAP_GPA,
-			.r12 = start,
-			.r13 = end - start };
-
-		u64 map_fail_paddr;
-		u64 ret = __tdx_hypercall(&args);
+		u64 map_fail_paddr, ret;
 
+		ret = TDVMCALL_1(TDVMCALL_MAP_GPA,
+				 start, end - start, 0, 0, map_fail_paddr);
 		if (ret != TDVMCALL_STATUS_RETRY)
 			return !ret;
 		/*
@@ -813,7 +808,6 @@ static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc)
 		 * region starting at the GPA specified in R11. R11 comes
 		 * from the untrusted VMM. Sanity check it.
 		 */
-		map_fail_paddr = args.r11;
 		if (map_fail_paddr < start || map_fail_paddr >= end)
 			return false;
 
-- 
2.43.0