KVM: x86: Make kvm_pio_request.linear_rip a common field for user exits

Move and rename kvm_pio_request.linear_rip to
kvm_vcpu_arch.cui_linear_rip so that the field can be used by other
userspace exit completion flows that need to take action if and only
if userspace has not modified RIP.

No functional changes intended.

Suggested-by: Sean Christopherson <[email protected]>
Signed-off-by: Manali Shukla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: Kullu14

arch/x86/include/asm/kvm_host.h

@@ -412,7 +412,6 @@ struct kvm_rmap_head {
 };
 
 struct kvm_pio_request {
-	unsigned long linear_rip;
 	unsigned long count;
 	int in;
 	int port;
@@ -918,6 +917,7 @@ struct kvm_vcpu_arch {
 	bool emulate_regs_need_sync_to_vcpu;
 	bool emulate_regs_need_sync_from_vcpu;
 	int (*complete_userspace_io)(struct kvm_vcpu *vcpu);
+	unsigned long cui_linear_rip;
 
 	gpa_t time;
 	s8  pvclock_tsc_shift;

arch/x86/kvm/x86.c

@@ -9359,7 +9359,7 @@ static int complete_fast_pio_out(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.pio.count = 0;
 
-	if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip)))
+	if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.cui_linear_rip)))
 		return 1;
 
 	return kvm_skip_emulated_instruction(vcpu);
@@ -9384,7 +9384,7 @@ static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size,
 			complete_fast_pio_out_port_0x7e;
 		kvm_skip_emulated_instruction(vcpu);
 	} else {
-		vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
+		vcpu->arch.cui_linear_rip = kvm_get_linear_rip(vcpu);
 		vcpu->arch.complete_userspace_io = complete_fast_pio_out;
 	}
 	return 0;
@@ -9397,7 +9397,7 @@ static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
 	/* We should only ever be called with arch.pio.count equal to 1 */
 	BUG_ON(vcpu->arch.pio.count != 1);
 
-	if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) {
+	if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.cui_linear_rip))) {
 		vcpu->arch.pio.count = 0;
 		return 1;
 	}
@@ -9426,7 +9426,7 @@ static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
 		return ret;
 	}
 
-	vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu);
+	vcpu->arch.cui_linear_rip = kvm_get_linear_rip(vcpu);
 	vcpu->arch.complete_userspace_io = complete_fast_pio_in;
 
 	return 0;