linux-kernel - [PATCH] x86: Print amd virtualization features in /proc/cpuinfo

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Message-ID: <1249996732-13794-1-git-send-email-joerg.roedel@amd.com>
Date:	Tue, 11 Aug 2009 15:18:52 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH] x86: Print amd virtualization features in /proc/cpuinfo

This patch adds code to cpu initialization path to detect the extended
virtualization features of AMD cpus and shows them in /proc/cpuinfo.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/include/asm/cpufeature.h |    5 +++++
 arch/x86/kernel/cpu/amd.c         |   25 +++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 4a28d22..d3218e3 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -165,6 +165,11 @@
 #define X86_FEATURE_FLEXPRIORITY (8*32+ 2) /* Intel FlexPriority */
 #define X86_FEATURE_EPT         (8*32+ 3) /* Intel Extended Page Table */
 #define X86_FEATURE_VPID        (8*32+ 4) /* Intel Virtual Processor ID */
+#define X86_FEATURE_NPT		(8*32+5)  /* AMD Nested Page Table support */
+#define X86_FEATURE_LBRV	(8*32+6)  /* LBR Virtualization support */
+#define X86_FEATURE_SVML	(8*32+7)  /* "svm_lock" SVM locking MSR */
+#define X86_FEATURE_NRIPS	(8*32+8)  /* "nrip_save" svm next_rip save */
+
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index ec6c7a8..ac567d4 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -367,6 +367,28 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 #endif
 }
 
+static void __cpuinit detect_amd_virt_flags(struct cpuinfo_x86 *c)
+{
+
+#define SVM_FEATURE_NPT_MASK   0x00000001
+#define SVM_FEATURE_LBRV_MASK  0x00000002
+#define SVM_FEATURE_SVML_MASK  0x00000004
+#define SVM_FEATURE_NRIPS_MASK 0x00000008
+
+	u32 virt_flags;
+
+	virt_flags = cpuid_edx(0x8000000A);
+
+	if (virt_flags & SVM_FEATURE_NPT_MASK)
+		set_cpu_cap(c,  X86_FEATURE_NPT);
+	if (virt_flags & SVM_FEATURE_LBRV_MASK)
+		set_cpu_cap(c,  X86_FEATURE_LBRV);
+	if (virt_flags & SVM_FEATURE_SVML_MASK)
+		set_cpu_cap(c,  X86_FEATURE_SVML);
+	if (virt_flags & SVM_FEATURE_NRIPS_MASK)
+		set_cpu_cap(c,  X86_FEATURE_NRIPS);
+}
+
 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 {
 #ifdef CONFIG_SMP
@@ -499,6 +521,9 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 		}
 	}
 #endif
+
+	if (cpu_has(c, X86_FEATURE_SVM))
+		detect_amd_virt_flags(c);
 }
 
 #ifdef CONFIG_X86_32
-- 
1.6.3.3


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