KVM: Hoist SVM's get_cs_db_l_bits into core code.

SVM gets the DB and L bits for the cs by decoding the segment.  This
is in fact the completely generic code, so hoist it for kvm-lite to use.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 12 insertions, 9 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 9bf9ac6389b1..ee9f8bdee755 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -586,6 +586,7 @@ void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
+void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 
 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 7341c0949340..9dffbbea46a7 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2270,6 +2270,16 @@ static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
         return 0;
 }
 
+void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
+{
+        struct kvm_segment cs;
+
+        get_segment(vcpu, &cs, VCPU_SREG_CS);
+        *db = cs.db;
+        *l = cs.l;
+}
+EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
+
 /*
  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index e51f6b7f8ff3..35f3f83b5c6c 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -724,14 +724,6 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
         var->unusable = !var->present;
 }
 
-static void svm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
-{
-        struct vmcb_seg *s = svm_seg(vcpu, VCPU_SREG_CS);
-
-        *db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
-        *l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
-}
-
 static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 {
         struct vcpu_svm *svm = to_svm(vcpu);
@@ -1771,7 +1763,7 @@ static struct kvm_arch_ops svm_arch_ops = {
         .get_segment_base = svm_get_segment_base,
         .get_segment = svm_get_segment,
         .set_segment = svm_set_segment,
-        .get_cs_db_l_bits = svm_get_cs_db_l_bits,
+        .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
         .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
         .set_cr0 = svm_set_cr0,
         .set_cr3 = svm_set_cr3,