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From: Ashish Kalra <Ashish.Kalra@amd.com>
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Subject: [PATCH v4 2/4] x86/sev: add sev_es_enabled() function.
Date: Tue, 9 Apr 2024 20:42:38 +0000
Message-ID: <906e037ecd7592eba859448606b028a68a5d48f8.1712694667.git.ashish.kalra@amd.com>
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From: Ashish Kalra <ashish.kalra@amd.com>

Add sev_es_enabled() function to detect if SEV-ES
support is enabled.

Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 arch/x86/boot/compressed/sev.c | 5 +++++
 arch/x86/boot/compressed/sev.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index ec71846d28c9..4ae4cc51e6b8 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -134,6 +134,11 @@ bool sev_snp_enabled(void)
 	return sev_status & MSR_AMD64_SEV_SNP_ENABLED;
 }
 
+bool sev_es_enabled(void)
+{
+	return sev_status & MSR_AMD64_SEV_ES_ENABLED;
+}
+
 static void __page_state_change(unsigned long paddr, enum psc_op op)
 {
 	u64 val;
diff --git a/arch/x86/boot/compressed/sev.h b/arch/x86/boot/compressed/sev.h
index fc725a981b09..5008c80e66e6 100644
--- a/arch/x86/boot/compressed/sev.h
+++ b/arch/x86/boot/compressed/sev.h
@@ -11,11 +11,13 @@
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 
 bool sev_snp_enabled(void);
+bool sev_es_enabled(void);
 void snp_accept_memory(phys_addr_t start, phys_addr_t end);
 
 #else
 
 static inline bool sev_snp_enabled(void) { return false; }
+static inline bool sev_es_enabled(void) { return false; }
 static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
 
 #endif
-- 
2.34.1