KVM: MMU: Make the definition of 'INVALID_GPA' common

KVM already has a 'GPA_INVALID' defined as (~(gpa_t)0) in kvm_types.h,
and it is used by ARM code. We do not need another definition of
'INVALID_GPA' for X86 specifically.

Instead of using the common 'GPA_INVALID' for X86, replace it with
'INVALID_GPA', and change the users of 'GPA_INVALID' so that the diff
can be smaller. Also because the name 'INVALID_GPA' tells the user we
are using an invalid GPA, while the name 'GPA_INVALID' is emphasizing
the GPA is an invalid one.

No functional change intended.

Signed-off-by: Yu Zhang <[e-mail]>
Reviewed-by: Paul Durrant <[e-mail]>
Reviewed-by: Sean Christopherson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Oliver Upton <[e-mail]>

arch/arm64/include/asm/kvm_host.h

···
 
 static inline void kvm_arm_pvtime_vcpu_init(struct kvm_vcpu_arch *vcpu_arch)
 {
-	vcpu_arch->steal.base = GPA_INVALID;
+	vcpu_arch->steal.base = INVALID_GPA;
 }
 
 static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
 {
-	return (vcpu_arch->steal.base != GPA_INVALID);
+	return (vcpu_arch->steal.base != INVALID_GPA);
 }
 
 void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome);

arch/arm64/kvm/hypercalls.c

···
 		break;
 	case ARM_SMCCC_HV_PV_TIME_ST:
 		gpa = kvm_init_stolen_time(vcpu);
-		if (gpa != GPA_INVALID)
+		if (gpa != INVALID_GPA)
 			val[0] = gpa;
 		break;
 	case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:

arch/arm64/kvm/pvtime.c

···
 	u64 steal = 0;
 	int idx;
 
-	if (base == GPA_INVALID)
+	if (base == INVALID_GPA)
 		return;
 
 	idx = srcu_read_lock(&kvm->srcu);
···
 	switch (feature) {
 	case ARM_SMCCC_HV_PV_TIME_FEATURES:
 	case ARM_SMCCC_HV_PV_TIME_ST:
-		if (vcpu->arch.steal.base != GPA_INVALID)
+		if (vcpu->arch.steal.base != INVALID_GPA)
 			val = SMCCC_RET_SUCCESS;
 		break;
 	}
···
 	struct kvm *kvm = vcpu->kvm;
 	u64 base = vcpu->arch.steal.base;
 
-	if (base == GPA_INVALID)
+	if (base == INVALID_GPA)
 		return base;
 
 	/*
···
 		return -EFAULT;
 	if (!IS_ALIGNED(ipa, 64))
 		return -EINVAL;
-	if (vcpu->arch.steal.base != GPA_INVALID)
+	if (vcpu->arch.steal.base != INVALID_GPA)
 		return -EEXIST;
 
 	/* Check the address is in a valid memslot */

arch/x86/include/asm/kvm_host.h

···
 #define INVALID_PAGE (~(hpa_t)0)
 #define VALID_PAGE(x) ((x) != INVALID_PAGE)
 
-#define INVALID_GPA (~(gpa_t)0)
-
 /* KVM Hugepage definitions for x86 */
 #define KVM_MAX_HUGEPAGE_LEVEL	PG_LEVEL_1G
 #define KVM_NR_PAGE_SIZES	(KVM_MAX_HUGEPAGE_LEVEL - PG_LEVEL_4K + 1)

include/linux/kvm_types.h

···
 typedef u64            gpa_t;
 typedef u64            gfn_t;
 
-#define GPA_INVALID	(~(gpa_t)0)
+#define INVALID_GPA	(~(gpa_t)0)
 
 typedef unsigned long  hva_t;
 typedef u64            hpa_t;