KVM: x86 emulator: add (set|get)_dr callbacks to x86_emulate_ops

Add (set|get)_dr callbacks to x86_emulate_ops instead of calling
them directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/include/asm/kvm_emulate.h

@@ -137,6 +137,8 @@ struct x86_emulate_ops {
 	void (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
 	int (*cpl)(struct kvm_vcpu *vcpu);
 	void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
+	int (*get_dr)(int dr, unsigned long *dest, struct kvm_vcpu *vcpu);
+	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
 };
 
 /* Type, address-of, and value of an instruction's operand. */

arch/x86/include/asm/kvm_host.h

@@ -591,10 +591,6 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 int emulate_clts(struct kvm_vcpu *vcpu);
-int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
-		    unsigned long *dest);
-int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
-		    unsigned long value);
 
 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);

arch/x86/kvm/emulate.c

@@ -3132,7 +3132,7 @@ twobyte_insn:
 			kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
 			goto done;
 		}
-		emulator_get_dr(ctxt, c->modrm_reg, &c->regs[c->modrm_rm]);
+		ops->get_dr(c->modrm_reg, &c->regs[c->modrm_rm], ctxt->vcpu);
 		c->dst.type = OP_NONE;	/* no writeback */
 		break;
 	case 0x22: /* mov reg, cr */
@@ -3145,7 +3145,10 @@ twobyte_insn:
 			kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
 			goto done;
 		}
-		emulator_set_dr(ctxt, c->modrm_reg, c->regs[c->modrm_rm]);
+
+		ops->set_dr(c->modrm_reg,c->regs[c->modrm_rm] &
+			    ((ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U),
+			ctxt->vcpu);
 		c->dst.type = OP_NONE;	/* no writeback */
 		break;
 	case 0x30:

arch/x86/kvm/x86.c

@@ -3620,16 +3620,14 @@ int emulate_clts(struct kvm_vcpu *vcpu)
 	return X86EMUL_CONTINUE;
 }
 
-int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
+int emulator_get_dr(int dr, unsigned long *dest, struct kvm_vcpu *vcpu)
 {
-	return kvm_get_dr(ctxt->vcpu, dr, dest);
+	return kvm_get_dr(vcpu, dr, dest);
 }
 
-int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
+int emulator_set_dr(int dr, unsigned long value, struct kvm_vcpu *vcpu)
 {
-	unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
-
-	return kvm_set_dr(ctxt->vcpu, dr, value & mask);
+	return kvm_set_dr(vcpu, dr, value);
 }
 
 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
@@ -3811,6 +3809,8 @@ static struct x86_emulate_ops emulate_ops = {
 	.set_cr              = emulator_set_cr,
 	.cpl                 = emulator_get_cpl,
 	.set_rflags          = emulator_set_rflags,
+	.get_dr              = emulator_get_dr,
+	.set_dr              = emulator_set_dr,
 };
 
 static void cache_all_regs(struct kvm_vcpu *vcpu)