KVM: x86 emulator: store x86_emulate_ops in emulation context

It doesn't ever change, so we don't need to pass it around everywhere.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/include/asm/kvm_emulate.h

@@ -208,6 +208,8 @@ struct decode_cache {
 };
 
 struct x86_emulate_ctxt {
+	struct x86_emulate_ops *ops;
+
 	/* Register state before/after emulation. */
 	struct kvm_vcpu *vcpu;
 
@@ -249,12 +251,9 @@ struct x86_emulate_ctxt {
 #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
 #endif
 
-int x86_decode_insn(struct x86_emulate_ctxt *ctxt,
-		    struct x86_emulate_ops *ops);
-int x86_emulate_insn(struct x86_emulate_ctxt *ctxt,
-		     struct x86_emulate_ops *ops);
+int x86_decode_insn(struct x86_emulate_ctxt *ctxt);
+int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
 int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
-			 struct x86_emulate_ops *ops,
 			 u16 tss_selector, int reason,
 			 bool has_error_code, u32 error_code);
 

arch/x86/kvm/emulate.c

@@ -943,8 +943,9 @@ static int decode_abs(struct x86_emulate_ctxt *ctxt,
 }
 
 int
-x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
+x86_decode_insn(struct x86_emulate_ctxt *ctxt)
 {
+	struct x86_emulate_ops *ops = ctxt->ops;
 	struct decode_cache *c = &ctxt->decode;
 	int rc = X86EMUL_CONTINUE;
 	int mode = ctxt->mode;
@@ -2586,10 +2587,10 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
 }
 
 int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
-			 struct x86_emulate_ops *ops,
 			 u16 tss_selector, int reason,
 			 bool has_error_code, u32 error_code)
 {
+	struct x86_emulate_ops *ops = ctxt->ops;
 	struct decode_cache *c = &ctxt->decode;
 	int rc;
 
@@ -2619,8 +2620,9 @@ static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned long base,
 }
 
 int
-x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
+x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 {
+	struct x86_emulate_ops *ops = ctxt->ops;
 	u64 msr_data;
 	struct decode_cache *c = &ctxt->decode;
 	int rc = X86EMUL_CONTINUE;

arch/x86/kvm/x86.c

@@ -3998,7 +3998,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
 		vcpu->arch.emulate_ctxt.interruptibility = 0;
 		vcpu->arch.emulate_ctxt.exception = -1;
 
-		r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
+		r = x86_decode_insn(&vcpu->arch.emulate_ctxt);
 		trace_kvm_emulate_insn_start(vcpu);
 
 		/* Only allow emulation of specific instructions on #UD
@@ -4048,7 +4048,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
 	memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
 
 restart:
-	r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
+	r = x86_emulate_insn(&vcpu->arch.emulate_ctxt);
 
 	if (r) { /* emulation failed */
 		if (reexecute_instruction(vcpu, cr2))
@@ -5067,7 +5067,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
 	memset(c, 0, sizeof(struct decode_cache));
 	memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
 
-	ret = emulator_task_switch(&vcpu->arch.emulate_ctxt, &emulate_ops,
+	ret = emulator_task_switch(&vcpu->arch.emulate_ctxt,
 				   tss_selector, reason, has_error_code,
 				   error_code);
 
@@ -5424,6 +5424,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	BUG_ON(vcpu->kvm == NULL);
 	kvm = vcpu->kvm;
 
+	vcpu->arch.emulate_ctxt.ops = &emulate_ops;
 	vcpu->arch.mmu.root_hpa = INVALID_PAGE;
 	if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
 		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;