KVM: x86 emulator: add and use new callbacks set_idt(), set_gdt()

Replacing direct calls to realmode_lgdt(), realmode_lidt().
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/include/asm/kvm_emulate.h

@@ -176,6 +176,8 @@ struct x86_emulate_ops {
 						 int seg);
 	void (*get_gdt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt);
 	void (*get_idt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt);
+	void (*set_gdt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt);
+	void (*set_idt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt);
 	ulong (*get_cr)(struct x86_emulate_ctxt *ctxt, int cr);
 	int (*set_cr)(struct x86_emulate_ctxt *ctxt, int cr, ulong val);
 	int (*cpl)(struct x86_emulate_ctxt *ctxt);

arch/x86/include/asm/kvm_host.h

@@ -681,9 +681,6 @@ static inline int emulate_instruction(struct kvm_vcpu *vcpu,
 	return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0);
 }
 
-void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
-void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
-
 void kvm_enable_efer_bits(u64);
 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);

arch/x86/kvm/emulate.c

@@ -3494,6 +3494,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	int rc = X86EMUL_CONTINUE;
 	int saved_dst_type = c->dst.type;
 	int irq; /* Used for int 3, int, and into */
+	struct desc_ptr desc_ptr;
 
 	ctxt->decode.mem_read.pos = 0;
 
@@ -4005,9 +4006,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	switch (c->b) {
 	case 0x01: /* lgdt, lidt, lmsw */
 		switch (c->modrm_reg) {
-			u16 size;
-			unsigned long address;
-
 		case 0: /* vmcall */
 			if (c->modrm_mod != 3 || c->modrm_rm != 1)
 				goto cannot_emulate;
@@ -4023,10 +4021,11 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 			break;
 		case 2: /* lgdt */
 			rc = read_descriptor(ctxt, ops, c->src.addr.mem,
-					     &size, &address, c->op_bytes);
+					     &desc_ptr.size, &desc_ptr.address,
+					     c->op_bytes);
 			if (rc != X86EMUL_CONTINUE)
 				goto done;
-			realmode_lgdt(ctxt->vcpu, size, address);
+			ctxt->ops->set_gdt(ctxt, &desc_ptr);
 			/* Disable writeback. */
 			c->dst.type = OP_NONE;
 			break;
@@ -4041,11 +4040,12 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 				}
 			} else {
 				rc = read_descriptor(ctxt, ops, c->src.addr.mem,
-						     &size, &address,
+						     &desc_ptr.size,
+						     &desc_ptr.address,
 						     c->op_bytes);
 				if (rc != X86EMUL_CONTINUE)
 					goto done;
-				realmode_lidt(ctxt->vcpu, size, address);
+				ctxt->ops->set_idt(ctxt, &desc_ptr);
 			}
 			/* Disable writeback. */
 			c->dst.type = OP_NONE;

arch/x86/kvm/x86.c

@@ -4249,6 +4249,16 @@ static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
 	kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
 }
 
+static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
+{
+	kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
+}
+
+static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
+{
+	kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
+}
+
 static unsigned long emulator_get_cached_segment_base(
 	struct x86_emulate_ctxt *ctxt, int seg)
 {
@@ -4388,6 +4398,8 @@ static struct x86_emulate_ops emulate_ops = {
 	.get_cached_segment_base = emulator_get_cached_segment_base,
 	.get_gdt             = emulator_get_gdt,
 	.get_idt	     = emulator_get_idt,
+	.set_gdt             = emulator_set_gdt,
+	.set_idt	     = emulator_set_idt,
 	.get_cr              = emulator_get_cr,
 	.set_cr              = emulator_set_cr,
 	.cpl                 = emulator_get_cpl,
@@ -5049,20 +5061,6 @@ int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
 				       rip, instruction, 3, NULL);
 }
 
-void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
-{
-	struct desc_ptr dt = { limit, base };
-
-	kvm_x86_ops->set_gdt(vcpu, &dt);
-}
-
-void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
-{
-	struct desc_ptr dt = { limit, base };
-
-	kvm_x86_ops->set_idt(vcpu, &dt);
-}
-
 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
 {
 	struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];