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Date: Sat, 22 Sep 2007 00:32:18 +0200 (CEST)
From: Andi Kleen <ak@...e.de>
To: patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [19/50] Experimental: detect if SVM is disabled by BIOS
Also allow to set svm lock.
TBD double check, documentation, i386 support
Signed-off-by: Andi Kleen <ak@...e.de>
---
arch/x86_64/kernel/setup.c | 25 +++++++++++++++++++++++--
include/asm-i386/cpufeature.h | 1 +
include/asm-i386/msr-index.h | 3 +++
3 files changed, 27 insertions(+), 2 deletions(-)
Index: linux/arch/x86_64/kernel/setup.c
===================================================================
--- linux.orig/arch/x86_64/kernel/setup.c
+++ linux/arch/x86_64/kernel/setup.c
@@ -565,7 +565,7 @@ static void __cpuinit early_init_amd(str
static void __cpuinit init_amd(struct cpuinfo_x86 *c)
{
- unsigned level;
+ unsigned level, flags, dummy;
#ifdef CONFIG_SMP
unsigned long value;
@@ -634,7 +634,28 @@ static void __cpuinit init_amd(struct cp
/* Family 10 doesn't support C states in MWAIT so don't use it */
if (c->x86 == 0x10 && !force_mwait)
clear_bit(X86_FEATURE_MWAIT, &c->x86_capability);
+
+ if (c->x86 >= 0xf && c->x86 <= 0x11 &&
+ !rdmsr_safe(MSR_VM_CR, &flags, &dummy) &&
+ (flags & 0x18))
+ set_bit(X86_FEATURE_VIRT_DISABLED, &c->x86_capability);
+}
+
+static int enable_svm_lock(char *s)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+ boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) {
+ unsigned a,b;
+ if (rdmsr_safe(MSR_VM_CR, &a, &b))
+ return 0;
+ a |= (1 << 3); /* set SVM lock */
+ if (!wrmsr_safe(MSR_VM_CR, &a, &b))
+ return 1;
+ }
+ printk(KERN_ERR "CPU does not support svm_lock\n");
+ return 0;
}
+__setup("svm_lock", enable_svm_lock);
static void __cpuinit detect_ht(struct cpuinfo_x86 *c)
{
@@ -985,7 +1006,7 @@ static int show_cpuinfo(struct seq_file
NULL, NULL, NULL, NULL,
"constant_tsc", "up", NULL, "arch_perfmon",
"pebs", "bts", NULL, "sync_rdtsc",
- "rep_good", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ "rep_good", "virtualization_bios_disabled", NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
/* Intel-defined (#2) */
Index: linux/include/asm-i386/cpufeature.h
===================================================================
--- linux.orig/include/asm-i386/cpufeature.h
+++ linux/include/asm-i386/cpufeature.h
@@ -82,6 +82,7 @@
/* 14 free */
#define X86_FEATURE_SYNC_RDTSC (3*32+15) /* RDTSC synchronizes the CPU */
#define X86_FEATURE_REP_GOOD (3*32+16) /* rep microcode works well on this CPU */
+#define X86_FEATURE_VIRT_DISABLED (3*32+17) /* Hardware virt. BIOS disabled */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
Index: linux/include/asm-i386/msr-index.h
===================================================================
--- linux.orig/include/asm-i386/msr-index.h
+++ linux/include/asm-i386/msr-index.h
@@ -98,6 +98,9 @@
#define K8_MTRRFIXRANGE_DRAM_MODIFY 0x00080000 /* MtrrFixDramModEn bit */
#define K8_MTRR_RDMEM_WRMEM_MASK 0x18181818 /* Mask: RdMem|WrMem */
+/* SVM */
+#define MSR_VM_CR 0xc0010114
+
/* K7 MSRs */
#define MSR_K7_EVNTSEL0 0xc0010000
#define MSR_K7_PERFCTR0 0xc0010004
-
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