[PATCH] KVM: Simplify is_long_mode()

Instead of doing tricky stuff with the arch dependent virtualization
registers, take a peek at the guest's efer.

This simlifies some code, and fixes some confusion in the mmu branch.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 930e04ce1af6..c2db4218d6cc 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -278,7 +278,6 @@ struct kvm_arch_ops {
                             struct kvm_segment *var, int seg);
         void (*set_segment)(struct kvm_vcpu *vcpu,
                             struct kvm_segment *var, int seg);
-        int (*is_long_mode)(struct kvm_vcpu *vcpu);
         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
         void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
@@ -403,6 +402,15 @@ static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
         return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
 }
 
+static inline int is_long_mode(struct kvm_vcpu *vcpu)
+{
+#ifdef CONFIG_X86_64
+        return vcpu->shadow_efer & EFER_LME;
+#else
+        return 0;
+#endif
+}
+
 static inline int is_pae(struct kvm_vcpu *vcpu)
 {
         return vcpu->cr4 & CR4_PAE_MASK;