KVM: selftests: Allocate Hyper-V partition assist page

In preparation to testing Hyper-V L2 TLB flush hypercalls, allocate
so-called Partition assist page.
Reviewed-by: NSean Christopherson <seanjc@google.com>
Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-44-vkuznets@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/include/x86_64/hyperv.h

@@ -274,6 +274,11 @@ struct hyperv_test_pages {
 	uint64_t vp_assist_gpa;
 	void *vp_assist;
 
+	/* Partition assist page */
+	void *partition_assist_hva;
+	uint64_t partition_assist_gpa;
+	void *partition_assist;
+
 	/* Enlightened VMCS */
 	void *enlightened_vmcs_hva;
 	uint64_t enlightened_vmcs_gpa;

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

@@ -19,6 +19,11 @@ struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,
 	hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);
 	hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);
 
+	/* Setup of a region of guest memory for the partition assist page. */
+	hv->partition_assist = (void *)vm_vaddr_alloc_page(vm);
+	hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);
+	hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);
+
 	/* Setup of a region of guest memory for the enlightened VMCS. */
 	hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);
 	hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);