From: David Hildenbrand <david@redhat.com>
Date: Thu, 3 Aug 2017 18:11:04 +0200
Subject: KVM: nVMX: get rid of nested_get_page()
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
Patch-mainline: v4.14-rc1
Git-commit: 5e2f30b756a37bd80c5b0471d0e10d769ab2eb9a
References: bsc#1077761

nested_get_page() just sounds confusing. All we want is a page from G1.
This is even unrelated to nested.

Let's introduce kvm_vcpu_gpa_to_page() so we don't get too lengthy
lines.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[Squash pasto fix from Wanpeng Li. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
 arch/x86/kvm/vmx.c       |   57 +++++++++++++++++++++--------------------------
 include/linux/kvm_host.h |    6 ++++
 2 files changed, 32 insertions(+), 31 deletions(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -886,14 +886,6 @@
 	return to_vmx(vcpu)->nested.cached_vmcs12;
 }
 
-static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr)
-{
-	struct page *page = kvm_vcpu_gfn_to_page(vcpu, addr >> PAGE_SHIFT);
-	if (is_error_page(page))
-		return NULL;
-
-	return page;
-}
 
 static void nested_release_page(struct page *page)
 {
@@ -7139,8 +7131,8 @@
 		return kvm_skip_emulated_instruction(vcpu);
 	}
 
-	page = nested_get_page(vcpu, vmptr);
-	if (page == NULL) {
+	page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
+	if (is_error_page(page)) {
 		nested_vmx_failInvalid(vcpu);
 		return kvm_skip_emulated_instruction(vcpu);
 	}
@@ -7608,8 +7600,8 @@
 	if (vmx->nested.current_vmptr != vmptr) {
 		struct vmcs12 *new_vmcs12;
 		struct page *page;
-		page = nested_get_page(vcpu, vmptr);
-		if (page == NULL) {
+		page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
+		if (is_error_page(page)) {
 			nested_vmx_failInvalid(vcpu);
 			return kvm_skip_emulated_instruction(vcpu);
 		}
@@ -9607,6 +9599,7 @@
 					struct vmcs12 *vmcs12)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	struct page *page;
 	u64 hpa;
 
 	if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
@@ -9616,17 +9609,19 @@
 		 * physical address remains valid. We keep a reference
 		 * to it so we can release it later.
 		 */
-		if (vmx->nested.apic_access_page) /* shouldn't happen */
+		if (vmx->nested.apic_access_page) { /* shouldn't happen */
 			nested_release_page(vmx->nested.apic_access_page);
-		vmx->nested.apic_access_page =
-			nested_get_page(vcpu, vmcs12->apic_access_addr);
+			vmx->nested.apic_access_page = NULL;
+		}
+		page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->apic_access_addr);
 		/*
 		 * If translation failed, no matter: This feature asks
 		 * to exit when accessing the given address, and if it
 		 * can never be accessed, this feature won't do
 		 * anything anyway.
 		 */
-		if (vmx->nested.apic_access_page) {
+		if (!is_error_page(page)) {
+			vmx->nested.apic_access_page = page;
 			hpa = page_to_phys(vmx->nested.apic_access_page);
 			vmcs_write64(APIC_ACCESS_ADDR, hpa);
 		} else {
@@ -9641,10 +9636,11 @@
 	}
 
 	if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
-		if (vmx->nested.virtual_apic_page) /* shouldn't happen */
+		if (vmx->nested.virtual_apic_page) { /* shouldn't happen */
 			nested_release_page(vmx->nested.virtual_apic_page);
-		vmx->nested.virtual_apic_page =
-			nested_get_page(vcpu, vmcs12->virtual_apic_page_addr);
+			vmx->nested.virtual_apic_page = NULL;
+		}
+		page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->virtual_apic_page_addr);
 
 		/*
 		 * If translation failed, VM entry will fail because
@@ -9659,7 +9655,8 @@
 		 * control.  But such a configuration is useless, so
 		 * let's keep the code simple.
 		 */
-		if (vmx->nested.virtual_apic_page) {
+		if (!is_error_page(page)) {
+			vmx->nested.virtual_apic_page = page;
 			hpa = page_to_phys(vmx->nested.virtual_apic_page);
 			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa);
 		}
@@ -9669,15 +9666,13 @@
 		if (vmx->nested.pi_desc_page) { /* shouldn't happen */
 			kunmap(vmx->nested.pi_desc_page);
 			nested_release_page(vmx->nested.pi_desc_page);
+			vmx->nested.pi_desc_page = NULL;
 		}
-		vmx->nested.pi_desc_page =
-			nested_get_page(vcpu, vmcs12->posted_intr_desc_addr);
-		vmx->nested.pi_desc =
-			(struct pi_desc *)kmap(vmx->nested.pi_desc_page);
-		if (!vmx->nested.pi_desc) {
-			nested_release_page_clean(vmx->nested.pi_desc_page);
+		page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->posted_intr_desc_addr);
+		if (is_error_page(page))
 			return;
-		}
+		vmx->nested.pi_desc_page = page;
+		vmx->nested.pi_desc = kmap(vmx->nested.pi_desc_page);
 		vmx->nested.pi_desc =
 			(struct pi_desc *)((void *)vmx->nested.pi_desc +
 			(unsigned long)(vmcs12->posted_intr_desc_addr &
@@ -9759,8 +9754,8 @@
 	if (!nested_cpu_has_virt_x2apic_mode(vmcs12))
 		return false;
 
-	page = nested_get_page(vcpu, vmcs12->msr_bitmap);
-	if (!page)
+	page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->msr_bitmap);
+	if (is_error_page(page))
 		return false;
 	msr_bitmap_l1 = (unsigned long *)kmap(page);
 
@@ -11368,8 +11363,8 @@
 
 		gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull;
 
-		page = nested_get_page(vcpu, vmcs12->pml_address);
-		if (!page)
+		page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->pml_address);
+		if (is_error_page(page))
 			return 0;
 
 		pml_address = kmap(page);
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -985,6 +985,12 @@
 	return (hpa_t)pfn << PAGE_SHIFT;
 }
 
+static inline struct page *kvm_vcpu_gpa_to_page(struct kvm_vcpu *vcpu,
+						gpa_t gpa)
+{
+	return kvm_vcpu_gfn_to_page(vcpu, gpa_to_gfn(gpa));
+}
+
 static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
 {
 	unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));