KVM: selftests: Fix size of memslots created by Xen tests

For better or worse, the memslot APIs take the number of pages, not the
size in bytes.  The Xen tests need 2 pages, not 8192 pages.

Fixes: 8d4e7e80 ("KVM: x86: declare Xen HVM shared info capability and add test case")
Cc: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210210182609.435200-3-seanjc@google.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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

@@ -79,8 +79,7 @@ int main(int argc, char *argv[])
 
 	/* Map a region for the shared_info page */
 	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
-                                    SHINFO_REGION_GPA, SHINFO_REGION_SLOT,
-				    2 * getpagesize(), 0);
+				    SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 2, 0);
 	virt_map(vm, SHINFO_REGION_GPA, SHINFO_REGION_GPA, 2, 0);
 
 	struct kvm_xen_hvm_config hvmc = {

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

@@ -102,8 +102,7 @@ int main(int argc, char *argv[])
 
 	/* Map a region for the hypercall pages */
 	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
-                                    HCALL_REGION_GPA, HCALL_REGION_SLOT,
-				    2 * getpagesize(), 0);
+				    HCALL_REGION_GPA, HCALL_REGION_SLOT, 2, 0);
 	virt_map(vm, HCALL_REGION_GPA, HCALL_REGION_GPA, 2, 0);
 
 	for (;;) {