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authorJoerg Roedel <joerg.roedel@amd.com>2008-01-31 14:57:38 +0100
committerAvi Kivity <avi@qumranet.com>2008-04-27 11:53:18 +0300
commit50a37eb4e05efaa7bac6a948fd4db1a48c728b99 (patch)
tree34195810be002db84cfafb9ed706d48bb6752d52 /arch/x86/kvm/x86.c
parentf2b4b7ddf633ffa24ce7c89c9e0d8a06463484e3 (diff)
KVM: align valid EFER bits with the features of the host system
This patch aligns the bits the guest can set in the EFER register with the features in the host processor. Currently it lets EFER.NX disabled if the processor does not support it and enables EFER.LME and EFER.LMA only for KVM on 64 bit hosts. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r--arch/x86/kvm/x86.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ec9265b354b..db16f2353e4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -41,7 +41,15 @@
| X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
-static u64 __read_mostly efer_reserved_bits = 0xfffffffffffff2fe;
+/* EFER defaults:
+ * - enable syscall per default because its emulated by KVM
+ * - enable LME and LMA per default on 64 bit KVM
+ */
+#ifdef CONFIG_X86_64
+static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
+#else
+static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
+#endif
#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU