KVM: x86/mmu: Replace UNMAPPED_GVA with INVALID_GPA for gva_to_gpa()

The result of gva_to_gpa() is physical address not virtual address,
it is odd that UNMAPPED_GVA macro is used as the result for physical
address. Replace UNMAPPED_GVA with INVALID_GPA and drop UNMAPPED_GVA
macro.

No functional change intended.
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/6104978956449467d3c68f1ad7f2c2f6d771d0ee.1656667239.git.houwenlong.hwl@antgroup.comSigned-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/include/asm/kvm_host.h

@@ -129,7 +129,6 @@
 #define INVALID_PAGE (~(hpa_t)0)
 #define VALID_PAGE(x) ((x) != INVALID_PAGE)
 
-#define UNMAPPED_GVA (~(gpa_t)0)
 #define INVALID_GPA (~(gpa_t)0)
 
 /* KVM Hugepage definitions for x86 */

arch/x86/kvm/mmu/paging_tmpl.h

@@ -378,7 +378,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
 		 * information to fix the exit_qualification or exit_info_1
 		 * fields.
 		 */
-		if (unlikely(real_gpa == UNMAPPED_GVA))
+		if (unlikely(real_gpa == INVALID_GPA))
 			return 0;
 
 		host_addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gpa_to_gfn(real_gpa),
@@ -431,7 +431,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
 #endif
 
 	real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(gfn), access, &walker->fault);
-	if (real_gpa == UNMAPPED_GVA)
+	if (real_gpa == INVALID_GPA)
 		return 0;
 
 	walker->gfn = real_gpa >> PAGE_SHIFT;
@@ -962,7 +962,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 			       struct x86_exception *exception)
 {
 	struct guest_walker walker;
-	gpa_t gpa = UNMAPPED_GVA;
+	gpa_t gpa = INVALID_GPA;
 	int r;
 
 #ifndef CONFIG_X86_64

arch/x86/kvm/vmx/sgx.c

@@ -79,7 +79,7 @@ static int sgx_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t gva, bool write,
 	else
 		*gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, &ex);
 
-	if (*gpa == UNMAPPED_GVA) {
+	if (*gpa == INVALID_GPA) {
 		kvm_inject_emulated_page_fault(vcpu, &ex);
 		return -EFAULT;
 	}

arch/x86/kvm/x86.c

@@ -849,7 +849,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 	 */
 	real_gpa = kvm_translate_gpa(vcpu, mmu, gfn_to_gpa(pdpt_gfn),
 				     PFERR_USER_MASK | PFERR_WRITE_MASK, NULL);
-	if (real_gpa == UNMAPPED_GVA)
+	if (real_gpa == INVALID_GPA)
 		return 0;
 
 	/* Note the offset, PDPTRs are 32 byte aligned when using PAE paging. */
@@ -7072,7 +7072,7 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
 		unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
 		int ret;
 
-		if (gpa == UNMAPPED_GVA)
+		if (gpa == INVALID_GPA)
 			return X86EMUL_PROPAGATE_FAULT;
 		ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
 					       offset, toread);
@@ -7103,7 +7103,7 @@ static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
 	/* Inline kvm_read_guest_virt_helper for speed.  */
 	gpa_t gpa = mmu->gva_to_gpa(vcpu, mmu, addr, access|PFERR_FETCH_MASK,
 				    exception);
-	if (unlikely(gpa == UNMAPPED_GVA))
+	if (unlikely(gpa == INVALID_GPA))
 		return X86EMUL_PROPAGATE_FAULT;
 
 	offset = addr & (PAGE_SIZE-1);
@@ -7173,7 +7173,7 @@ static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes
 		unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
 		int ret;
 
-		if (gpa == UNMAPPED_GVA)
+		if (gpa == INVALID_GPA)
 			return X86EMUL_PROPAGATE_FAULT;
 		ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite);
 		if (ret < 0) {
@@ -7284,7 +7284,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
 
 	*gpa = mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
 
-	if (*gpa == UNMAPPED_GVA)
+	if (*gpa == INVALID_GPA)
 		return -1;
 
 	return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write);
@@ -7521,7 +7521,7 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
 
 	gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
 
-	if (gpa == UNMAPPED_GVA ||
+	if (gpa == INVALID_GPA ||
 	    (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
 		goto emul_write;
 
@@ -8338,7 +8338,7 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 		 * If the mapping is invalid in guest, let cpu retry
 		 * it to generate fault.
 		 */
-		if (gpa == UNMAPPED_GVA)
+		if (gpa == INVALID_GPA)
 			return true;
 	}
 
@@ -11378,7 +11378,7 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
 	srcu_read_unlock(&vcpu->kvm->srcu, idx);
 	tr->physical_address = gpa;
-	tr->valid = gpa != UNMAPPED_GVA;
+	tr->valid = gpa != INVALID_GPA;
 	tr->writeable = 1;
 	tr->usermode = 0;
 
@@ -12983,7 +12983,7 @@ void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_c
 		(PFERR_WRITE_MASK | PFERR_FETCH_MASK | PFERR_USER_MASK);
 
 	if (!(error_code & PFERR_PRESENT_MASK) ||
-	    mmu->gva_to_gpa(vcpu, mmu, gva, access, &fault) != UNMAPPED_GVA) {
+	    mmu->gva_to_gpa(vcpu, mmu, gva, access, &fault) != INVALID_GPA) {
 		/*
 		 * If vcpu->arch.walk_mmu->gva_to_gpa succeeded, the page
 		 * tables probably do not match the TLB.  Just proceed