KVM: selftests: Add helpers to allocate N pages of virtual memory

Add wrappers to allocate 1 and N pages of memory using de facto standard
values as the defaults for minimum virtual address, data memslot, and
page table memslot.  Convert all compatible users.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622200529.3650424-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/include/kvm_util.h

@@ -142,6 +142,9 @@ void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot);
 void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid);
 vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
 			  uint32_t data_memslot, uint32_t pgd_memslot);
+vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages);
+vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm);
+
 void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 	      unsigned int npages, uint32_t pgd_memslot);
 void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa);

tools/testing/selftests/kvm/lib/kvm_util.c

@@ -1276,6 +1276,44 @@ vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
 	return vaddr_start;
 }
 
+/*
+ * VM Virtual Address Allocate Pages
+ *
+ * Input Args:
+ *   vm - Virtual Machine
+ *
+ * Output Args: None
+ *
+ * Return:
+ *   Starting guest virtual address
+ *
+ * Allocates at least N system pages worth of bytes within the virtual address
+ * space of the vm.
+ */
+vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages)
+{
+	return vm_vaddr_alloc(vm, nr_pages * getpagesize(), 0x10000, 0, 0);
+}
+
+/*
+ * VM Virtual Address Allocate Page
+ *
+ * Input Args:
+ *   vm - Virtual Machine
+ *
+ * Output Args: None
+ *
+ * Return:
+ *   Starting guest virtual address
+ *
+ * Allocates at least one system page worth of bytes within the virtual address
+ * space of the vm.
+ */
+vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm)
+{
+	return vm_vaddr_alloc_pages(vm, 1);
+}
+
 /*
  * Map a range of VM virtual address to the VM's physical address
  *

tools/testing/selftests/kvm/lib/x86_64/svm.c

@@ -30,17 +30,14 @@ u64 rflags;
 struct svm_test_data *
 vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva)
 {
-	vm_vaddr_t svm_gva = vm_vaddr_alloc(vm, getpagesize(),
-					    0x10000, 0, 0);
+	vm_vaddr_t svm_gva = vm_vaddr_alloc_page(vm);
 	struct svm_test_data *svm = addr_gva2hva(vm, svm_gva);
 
-	svm->vmcb = (void *)vm_vaddr_alloc(vm, getpagesize(),
-					   0x10000, 0, 0);
+	svm->vmcb = (void *)vm_vaddr_alloc_page(vm);
 	svm->vmcb_hva = addr_gva2hva(vm, (uintptr_t)svm->vmcb);
 	svm->vmcb_gpa = addr_gva2gpa(vm, (uintptr_t)svm->vmcb);
 
-	svm->save_area = (void *)vm_vaddr_alloc(vm, getpagesize(),
-						0x10000, 0, 0);
+	svm->save_area = (void *)vm_vaddr_alloc_page(vm);
 	svm->save_area_hva = addr_gva2hva(vm, (uintptr_t)svm->save_area);
 	svm->save_area_gpa = addr_gva2gpa(vm, (uintptr_t)svm->save_area);
 

tools/testing/selftests/kvm/lib/x86_64/vmx.c

@@ -77,50 +77,48 @@ int vcpu_enable_evmcs(struct kvm_vm *vm, int vcpu_id)
 struct vmx_pages *
 vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva)
 {
-	vm_vaddr_t vmx_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vm_vaddr_t vmx_gva = vm_vaddr_alloc_page(vm);
 	struct vmx_pages *vmx = addr_gva2hva(vm, vmx_gva);
 
 	/* Setup of a region of guest memory for the vmxon region. */
-	vmx->vmxon = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->vmxon = (void *)vm_vaddr_alloc_page(vm);
 	vmx->vmxon_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmxon);
 	vmx->vmxon_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmxon);
 
 	/* Setup of a region of guest memory for a vmcs. */
-	vmx->vmcs = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->vmcs = (void *)vm_vaddr_alloc_page(vm);
 	vmx->vmcs_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmcs);
 	vmx->vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmcs);
 
 	/* Setup of a region of guest memory for the MSR bitmap. */
-	vmx->msr = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->msr = (void *)vm_vaddr_alloc_page(vm);
 	vmx->msr_hva = addr_gva2hva(vm, (uintptr_t)vmx->msr);
 	vmx->msr_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->msr);
 	memset(vmx->msr_hva, 0, getpagesize());
 
 	/* Setup of a region of guest memory for the shadow VMCS. */
-	vmx->shadow_vmcs = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->shadow_vmcs = (void *)vm_vaddr_alloc_page(vm);
 	vmx->shadow_vmcs_hva = addr_gva2hva(vm, (uintptr_t)vmx->shadow_vmcs);
 	vmx->shadow_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->shadow_vmcs);
 
 	/* Setup of a region of guest memory for the VMREAD and VMWRITE bitmaps. */
-	vmx->vmread = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->vmread = (void *)vm_vaddr_alloc_page(vm);
 	vmx->vmread_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmread);
 	vmx->vmread_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmread);
 	memset(vmx->vmread_hva, 0, getpagesize());
 
-	vmx->vmwrite = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->vmwrite = (void *)vm_vaddr_alloc_page(vm);
 	vmx->vmwrite_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmwrite);
 	vmx->vmwrite_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmwrite);
 	memset(vmx->vmwrite_hva, 0, getpagesize());
 
 	/* Setup of a region of guest memory for the VP Assist page. */
-	vmx->vp_assist = (void *)vm_vaddr_alloc(vm, getpagesize(),
-						0x10000, 0, 0);
+	vmx->vp_assist = (void *)vm_vaddr_alloc_page(vm);
 	vmx->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)vmx->vp_assist);
 	vmx->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vp_assist);
 
 	/* Setup of a region of guest memory for the enlightened VMCS. */
-	vmx->enlightened_vmcs = (void *)vm_vaddr_alloc(vm, getpagesize(),
-						       0x10000, 0, 0);
+	vmx->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);
 	vmx->enlightened_vmcs_hva =
 		addr_gva2hva(vm, (uintptr_t)vmx->enlightened_vmcs);
 	vmx->enlightened_vmcs_gpa =
@@ -538,7 +536,7 @@ void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
 void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm,
 		  uint32_t eptp_memslot)
 {
-	vmx->eptp = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	vmx->eptp = (void *)vm_vaddr_alloc_page(vm);
 	vmx->eptp_hva = addr_gva2hva(vm, (uintptr_t)vmx->eptp);
 	vmx->eptp_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->eptp);
 }
@@ -546,8 +544,7 @@ void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm,
 void prepare_virtualize_apic_accesses(struct vmx_pages *vmx, struct kvm_vm *vm,
 				      uint32_t eptp_memslot)
 {
-	vmx->apic_access = (void *)vm_vaddr_alloc(vm, getpagesize(),
-						  0x10000, 0, 0);
+	vmx->apic_access = (void *)vm_vaddr_alloc_page(vm);
 	vmx->apic_access_hva = addr_gva2hva(vm, (uintptr_t)vmx->apic_access);
 	vmx->apic_access_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->apic_access);
 }

tools/testing/selftests/kvm/x86_64/hyperv_clock.c

@@ -214,7 +214,7 @@ int main(void)
 
 	vcpu_set_hv_cpuid(vm, VCPU_ID);
 
-	tsc_page_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	tsc_page_gva = vm_vaddr_alloc_page(vm);
 	memset(addr_gpa2hva(vm, tsc_page_gva), 0x0, getpagesize());
 	TEST_ASSERT((addr_gva2gpa(vm, tsc_page_gva) & (getpagesize() - 1)) == 0,
 		"TSC page has to be page aligned\n");

tools/testing/selftests/kvm/x86_64/hyperv_features.c

@@ -604,7 +604,7 @@ int main(void)
 	/* Test MSRs */
 	vm = vm_create_default(VCPU_ID, 0, guest_msr);
 
-	msr_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	msr_gva = vm_vaddr_alloc_page(vm);
 	memset(addr_gva2hva(vm, msr_gva), 0x0, getpagesize());
 	vcpu_args_set(vm, VCPU_ID, 1, msr_gva);
 	vcpu_enable_cap(vm, VCPU_ID, &cap);
@@ -626,10 +626,10 @@ int main(void)
 	vm = vm_create_default(VCPU_ID, 0, guest_hcall);
 
 	/* Hypercall input/output */
-	hcall_page = vm_vaddr_alloc(vm, 2 * getpagesize(), 0x10000, 0, 0);
+	hcall_page = vm_vaddr_alloc_pages(vm, 2);
 	memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());
 
-	hcall_params = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
+	hcall_params = vm_vaddr_alloc_page(vm);
 	memset(addr_gva2hva(vm, hcall_params), 0x0, getpagesize());
 
 	vcpu_args_set(vm, VCPU_ID, 2, addr_gva2gpa(vm, hcall_page), hcall_params);