KVM: x86 emulator: add ->fix_hypercall() callback

Artificial, but needed to remove direct calls to KVM.
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/x86/include/asm/kvm_emulate.h

@@ -187,6 +187,7 @@ struct x86_emulate_ops {
 	int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
 	int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
 	void (*halt)(struct x86_emulate_ctxt *ctxt);
+	int (*fix_hypercall)(struct x86_emulate_ctxt *ctxt);
 	void (*get_fpu)(struct x86_emulate_ctxt *ctxt); /* disables preempt */
 	void (*put_fpu)(struct x86_emulate_ctxt *ctxt); /* reenables preempt */
 	int (*intercept)(struct x86_emulate_ctxt *ctxt,

arch/x86/include/asm/kvm_host.h

@@ -752,8 +752,6 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
 
 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 
-int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
-
 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code,
 		       void *insn, int insn_len);
 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);

arch/x86/kvm/emulate.c

@@ -4025,7 +4025,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 			if (c->modrm_mod != 3 || c->modrm_rm != 1)
 				goto cannot_emulate;
 
-			rc = kvm_fix_hypercall(ctxt->vcpu);
+			rc = ctxt->ops->fix_hypercall(ctxt);
 			if (rc != X86EMUL_CONTINUE)
 				goto done;
 
@@ -4048,7 +4048,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 			if (c->modrm_mod == 3) {
 				switch (c->modrm_rm) {
 				case 1:
-					rc = kvm_fix_hypercall(ctxt->vcpu);
+					rc = ctxt->ops->fix_hypercall(ctxt);
 					break;
 				default:
 					goto cannot_emulate;

arch/x86/kvm/x86.c

@@ -152,6 +152,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 
 u64 __read_mostly host_xcr0;
 
+int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
+
 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 {
 	int i;
@@ -4406,6 +4408,7 @@ static struct x86_emulate_ops emulate_ops = {
 	.set_msr             = emulator_set_msr,
 	.get_msr             = emulator_get_msr,
 	.halt                = emulator_halt,
+	.fix_hypercall       = emulator_fix_hypercall,
 	.get_fpu             = emulator_get_fpu,
 	.put_fpu             = emulator_put_fpu,
 	.intercept           = emulator_intercept,
@@ -5042,8 +5045,9 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
 
-int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
+int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
 {
+	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
 	char instruction[3];
 	unsigned long rip = kvm_rip_read(vcpu);