linux-kernel - [PATCH v4 2/4] x86/sev: add sev_es

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Message-ID: <906e037ecd7592eba859448606b028a68a5d48f8.1712694667.git.ashish.kalra@amd.com>
Date: Tue, 9 Apr 2024 20:42:38 +0000
From: Ashish Kalra <Ashish.Kalra@....com>
To: <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>
CC: <rafael@...nel.org>, <peterz@...radead.org>, <adrian.hunter@...el.com>,
	<sathyanarayanan.kuppuswamy@...ux.intel.com>, <jun.nakajima@...el.com>,
	<rick.p.edgecombe@...el.com>, <thomas.lendacky@....com>,
	<michael.roth@....com>, <seanjc@...gle.com>, <kai.huang@...el.com>,
	<bhe@...hat.com>, <kirill.shutemov@...ux.intel.com>, <bdas@...hat.com>,
	<vkuznets@...hat.com>, <dionnaglaze@...gle.com>, <anisinha@...hat.com>,
	<jroedel@...e.de>, <ardb@...nel.org>, <kexec@...ts.infradead.org>,
	<linux-coco@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 2/4] x86/sev: add sev_es_enabled() function.

From: Ashish Kalra <ashish.kalra@....com>

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

Signed-off-by: Ashish Kalra <ashish.kalra@....com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.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