linux-kernel - [PATCH v2 1/2] x86/coco: Mark cc_platform

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Message-Id: <20230328201712.25852-2-bp@alien8.de>
Date:   Tue, 28 Mar 2023 22:17:11 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Joerg Roedel <joro@...tes.org>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/2] x86/coco: Mark cc_platform_has() and descendants noinstr

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Those will be used in code regions where instrumentation is not allowed
so mark them as such.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 arch/x86/coco/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
index 73f83233d25d..df10e75be085 100644
--- a/arch/x86/coco/core.c
+++ b/arch/x86/coco/core.c
@@ -16,7 +16,7 @@
 enum cc_vendor cc_vendor __ro_after_init;
 static u64 cc_mask __ro_after_init;
 
-static bool intel_cc_platform_has(enum cc_attr attr)
+static bool noinstr intel_cc_platform_has(enum cc_attr attr)
 {
 	switch (attr) {
 	case CC_ATTR_GUEST_UNROLL_STRING_IO:
@@ -34,7 +34,7 @@ static bool intel_cc_platform_has(enum cc_attr attr)
  * the other levels of SME/SEV functionality, including C-bit
  * based SEV-SNP, are not enabled.
  */
-static __maybe_unused bool amd_cc_platform_vtom(enum cc_attr attr)
+static __maybe_unused __always_inline bool amd_cc_platform_vtom(enum cc_attr attr)
 {
 	switch (attr) {
 	case CC_ATTR_GUEST_MEM_ENCRYPT:
@@ -58,7 +58,7 @@ static __maybe_unused bool amd_cc_platform_vtom(enum cc_attr attr)
  * the trampoline area must be encrypted.
  */
 
-static bool amd_cc_platform_has(enum cc_attr attr)
+static bool noinstr amd_cc_platform_has(enum cc_attr attr)
 {
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 
@@ -97,7 +97,7 @@ static bool amd_cc_platform_has(enum cc_attr attr)
 #endif
 }
 
-bool cc_platform_has(enum cc_attr attr)
+bool noinstr cc_platform_has(enum cc_attr attr)
 {
 	switch (cc_vendor) {
 	case CC_VENDOR_AMD:
-- 
2.35.1