The following commit has been merged into the x86/cc branch of tip:

Commit-ID:     3d91c537296794d5d0773f61abbe7b63f2f132d8
Gitweb:        https://git.kernel.org/tip/3d91c537296794d5d0773f61abbe7b63f2f132d8
Author:        Borislav Petkov (AMD) <bp@alien8.de>
AuthorDate:    Sat, 18 Mar 2023 12:56:33 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 30 Mar 2023 14:06:28 +02:00

x86/coco: Export cc_vendor

It will be used in different checks in future changes. Export it directly
and provide accessor functions and stubs so this can be used in general
code when CONFIG_ARCH_HAS_CC_PLATFORM is not set.

No functional changes.

[ tglx: Add accessor functions ]

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230318115634.9392-2-bp@alien8.de

---
 arch/x86/coco/core.c        | 13 ++++---------
 arch/x86/include/asm/coco.h | 23 ++++++++++++++++++++---
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
index 49b44f8..684f0a9 100644
--- a/arch/x86/coco/core.c
+++ b/arch/x86/coco/core.c
@@ -13,7 +13,7 @@
 #include <asm/coco.h>
 #include <asm/processor.h>
 
-static enum cc_vendor vendor __ro_after_init;
+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)
@@ -83,7 +83,7 @@ static bool hyperv_cc_platform_has(enum cc_attr attr)
 
 bool cc_platform_has(enum cc_attr attr)
 {
-	switch (vendor) {
+	switch (cc_vendor) {
 	case CC_VENDOR_AMD:
 		return amd_cc_platform_has(attr);
 	case CC_VENDOR_INTEL:
@@ -105,7 +105,7 @@ u64 cc_mkenc(u64 val)
 	 * - for AMD, bit *set* means the page is encrypted
 	 * - for Intel *clear* means encrypted.
 	 */
-	switch (vendor) {
+	switch (cc_vendor) {
 	case CC_VENDOR_AMD:
 		return val | cc_mask;
 	case CC_VENDOR_INTEL:
@@ -118,7 +118,7 @@ u64 cc_mkenc(u64 val)
 u64 cc_mkdec(u64 val)
 {
 	/* See comment in cc_mkenc() */
-	switch (vendor) {
+	switch (cc_vendor) {
 	case CC_VENDOR_AMD:
 		return val & ~cc_mask;
 	case CC_VENDOR_INTEL:
@@ -129,11 +129,6 @@ u64 cc_mkdec(u64 val)
 }
 EXPORT_SYMBOL_GPL(cc_mkdec);
 
-__init void cc_set_vendor(enum cc_vendor v)
-{
-	vendor = v;
-}
-
 __init void cc_set_mask(u64 mask)
 {
 	cc_mask = mask;
diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h
index 3d98c3a..91b9448 100644
--- a/arch/x86/include/asm/coco.h
+++ b/arch/x86/include/asm/coco.h
@@ -11,13 +11,30 @@ enum cc_vendor {
 	CC_VENDOR_INTEL,
 };
 
-void cc_set_vendor(enum cc_vendor v);
-void cc_set_mask(u64 mask);
-
 #ifdef CONFIG_ARCH_HAS_CC_PLATFORM
+extern enum cc_vendor cc_vendor;
+
+static inline enum cc_vendor cc_get_vendor(void)
+{
+	return cc_vendor;
+}
+
+static inline void cc_set_vendor(enum cc_vendor vendor)
+{
+	cc_vendor = vendor;
+}
+
+void cc_set_mask(u64 mask);
 u64 cc_mkenc(u64 val);
 u64 cc_mkdec(u64 val);
 #else
+static inline enum cc_vendor cc_get_vendor(void)
+{
+	return CC_VENDOR_NONE;
+}
+
+static inline void cc_set_vendor(enum cc_vendor vendor) { }
+
 static inline u64 cc_mkenc(u64 val)
 {
 	return val;