Subject: [PATCH v2 3/3] KVM: Take gpa_t in kvm_vcpu_map[_readonly]()

From: Peter Fang <[email-masked]>
Date: Tue, 7 Apr 2026 17:11:30 -0700

Move the conversion from a gpa_t to a gfn_t into kvm_vcpu_map() and
kvm_vcpu_map_readonly() so that they take a gpa_t directly, reducing
boilerplate at call sites.

__kvm_vcpu_map() still takes a gfn_t because guest page mapping is
fundamentally GFN-based.

No functional change intended.

Compile-tested on x86 and ppc, which are the current users of these
interfaces.

Suggested-by: Yosry Ahmed <[email-masked]>
Signed-off-by: Peter Fang <[email-masked]>
---
 arch/powerpc/kvm/book3s_pr.c |  2 +-
 arch/x86/kvm/svm/nested.c    |  4 ++--
 arch/x86/kvm/svm/sev.c       |  2 +-
 arch/x86/kvm/svm/svm.c       |  8 ++++----
 arch/x86/kvm/vmx/nested.c    | 11 +++++------
 include/linux/kvm_host.h     |  8 ++++----
 6 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 2ba2dd26a7ea..45dea4064618 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -644,7 +644,7 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 	u32 *page;
 	int i, r;
 
-	r = kvm_vcpu_map(vcpu, pte->raddr >> PAGE_SHIFT, &map);
+	r = kvm_vcpu_map(vcpu, pte->raddr, &map);
 	if (r)
 		return;
 
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index b36c33255bed..f168b54828bb 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1019,7 +1019,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
 	}
 
 	vmcb12_gpa = svm->vmcb->save.rax;
-	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map);
+	ret = kvm_vcpu_map(vcpu, vmcb12_gpa, &map);
 	if (ret == -EINVAL) {
 		kvm_inject_gp(vcpu, 0);
 		return 1;
@@ -1134,7 +1134,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
 	struct kvm_host_map map;
 	int rc;
 
-	rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
+	rc = kvm_vcpu_map(vcpu, svm->nested.vmcb12_gpa, &map);
 	if (rc) {
 		if (rc == -EINVAL)
 			kvm_inject_gp(vcpu, 0);
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 3f9c1aa39a0a..524607bb8cc2 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -4405,7 +4405,7 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
 		return 1;
 	}
 
-	if (kvm_vcpu_map(vcpu, ghcb_gpa >> PAGE_SHIFT, &svm->sev_es.ghcb_map)) {
+	if (kvm_vcpu_map(vcpu, ghcb_gpa, &svm->sev_es.ghcb_map)) {
 		/* Unable to map GHCB from guest */
 		vcpu_unimpl(vcpu, "vmgexit: error mapping GHCB [%#llx] from guest\n",
 			    ghcb_gpa);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index e6477affac9a..823c6a6f3594 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2159,7 +2159,7 @@ static int vmload_vmsave_interception(struct kvm_vcpu *vcpu, bool vmload)
 	if (nested_svm_check_permissions(vcpu))
 		return 1;
 
-	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
+	ret = kvm_vcpu_map(vcpu, svm->vmcb->save.rax, &map);
 	if (ret) {
 		if (ret == -EINVAL)
 			kvm_inject_gp(vcpu, 0);
@@ -4820,7 +4820,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
 	 * that, see svm_prepare_switch_to_guest()) which must be
 	 * preserved.
 	 */
-	if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), &map_save))
+	if (kvm_vcpu_map(vcpu, svm->nested.hsave_msr, &map_save))
 		return 1;
 
 	BUILD_BUG_ON(offsetof(struct vmcb, save) != 0x400);
@@ -4854,11 +4854,11 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
 	if (!(smram64->efer & EFER_SVME))
 		return 1;
 
-	if (kvm_vcpu_map(vcpu, gpa_to_gfn(smram64->svm_guest_vmcb_gpa), &map))
+	if (kvm_vcpu_map(vcpu, smram64->svm_guest_vmcb_gpa, &map))
 		return 1;
 
 	ret = 1;
-	if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), &map_save))
+	if (kvm_vcpu_map(vcpu, svm->nested.hsave_msr, &map_save))
 		goto unmap_map;
 
 	if (svm_allocate_nested(svm))
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 937aeb474af7..ee3ff76a8678 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -696,7 +696,7 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 			return true;
 	}
 
-	if (kvm_vcpu_map_readonly(vcpu, gpa_to_gfn(vmcs12->msr_bitmap), &map))
+	if (kvm_vcpu_map_readonly(vcpu, vmcs12->msr_bitmap, &map))
 		return false;
 
 	msr_bitmap_l1 = (unsigned long *)map.hva;
@@ -2138,8 +2138,7 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
 
 		nested_release_evmcs(vcpu);
 
-		if (kvm_vcpu_map(vcpu, gpa_to_gfn(evmcs_gpa),
-				 &vmx->nested.hv_evmcs_map))
+		if (kvm_vcpu_map(vcpu, evmcs_gpa, &vmx->nested.hv_evmcs_map))
 			return EVMPTRLD_ERROR;
 
 		vmx->nested.hv_evmcs = vmx->nested.hv_evmcs_map.hva;
@@ -3437,7 +3436,7 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
 	if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
 		map = &vmx->nested.apic_access_page_map;
 
-		if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->apic_access_addr), map)) {
+		if (!kvm_vcpu_map(vcpu, vmcs12->apic_access_addr, map)) {
 			vmcs_write64(APIC_ACCESS_ADDR, pfn_to_hpa(map->pfn));
 		} else {
 			pr_debug_ratelimited("%s: no backing for APIC-access address in vmcs12\n",
@@ -3453,7 +3452,7 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
 	if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
 		map = &vmx->nested.virtual_apic_map;
 
-		if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->virtual_apic_page_addr), map)) {
+		if (!kvm_vcpu_map(vcpu, vmcs12->virtual_apic_page_addr, map)) {
 			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, pfn_to_hpa(map->pfn));
 		} else if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING) &&
 		           nested_cpu_has(vmcs12, CPU_BASED_CR8_STORE_EXITING) &&
@@ -3479,7 +3478,7 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
 	if (nested_cpu_has_posted_intr(vmcs12)) {
 		map = &vmx->nested.pi_desc_map;
 
-		if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->posted_intr_desc_addr), map)) {
+		if (!kvm_vcpu_map(vcpu, vmcs12->posted_intr_desc_addr, map)) {
 			vmx->nested.pi_desc =
 				(struct pi_desc *)(((void *)map->hva) +
 				offset_in_page(vmcs12->posted_intr_desc_addr));
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 484378cfdcc0..893a8c76a665 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1897,16 +1897,16 @@ int __kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map,
 		   bool writable);
 void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map);
 
-static inline int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn,
+static inline int kvm_vcpu_map(struct kvm_vcpu *vcpu, gpa_t gpa,
 			       struct kvm_host_map *map)
 {
-	return __kvm_vcpu_map(vcpu, gfn, map, true);
+	return __kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), map, true);
 }
 
-static inline int kvm_vcpu_map_readonly(struct kvm_vcpu *vcpu, gfn_t gfn,
+static inline int kvm_vcpu_map_readonly(struct kvm_vcpu *vcpu, gpa_t gpa,
 					struct kvm_host_map *map)
 {
-	return __kvm_vcpu_map(vcpu, gfn, map, false);
+	return __kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), map, false);
 }
 
 static inline void kvm_vcpu_map_mark_dirty(struct kvm_vcpu *vcpu,
-- 
2.53.0