tests/resource: Fix HVM guest in !SHADOW builds

Right now, test-resource always creates HVM Shadow guests.  But if Xen has
SHADOW compiled out, running the test yields:

  $./test-resource
  XENMEM_acquire_resource tests
  Test x86 PV
    Created d1
    Test grant table
  Test x86 PVH
    Skip: 95 - Operation not supported

and doesn't really test HVM guests, but doesn't fail either.

There's nothing paging-mode-specific about this test, so default to HAP if
possible and provide a more specific message if neither HAP or Shadow are
available.

As we've got physinfo to hand, also provide more specific message about the
absence of PV or HVM support.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

tools/tests/resource/test-resource.c

@@ -20,6 +20,8 @@ static xc_interface *xch;
 static xenforeignmemory_handle *fh;
 static xengnttab_handle *gh;
 
+static xc_physinfo_t physinfo;
+
 static void test_gnttab(uint32_t domid, unsigned int nr_frames,
                         unsigned long gfn)
 {
@@ -172,6 +174,37 @@ static void test_domain_configurations(void)
 
         printf("Test %s\n", t->name);
 
+#if defined(__x86_64__) || defined(__i386__)
+        if ( t->create.flags & XEN_DOMCTL_CDF_hvm )
+        {
+            if ( !(physinfo.capabilities & XEN_SYSCTL_PHYSCAP_hvm) )
+            {
+                printf("  Skip: HVM not available\n");
+                continue;
+            }
+
+            /*
+             * On x86, use HAP guests if possible, but skip if neither HAP nor
+             * SHADOW is available.
+             */
+            if ( physinfo.capabilities & XEN_SYSCTL_PHYSCAP_hap )
+                t->create.flags |= XEN_DOMCTL_CDF_hap;
+            else if ( !(physinfo.capabilities & XEN_SYSCTL_PHYSCAP_shadow) )
+            {
+                printf("  Skip: Neither HAP or SHADOW available\n");
+                continue;
+            }
+        }
+        else
+        {
+            if ( !(physinfo.capabilities & XEN_SYSCTL_PHYSCAP_pv) )
+            {
+                printf("  Skip: PV not available\n");
+                continue;
+            }
+        }
+#endif
+
         rc = xc_domain_create(xch, &domid, &t->create);
         if ( rc )
         {
@@ -214,6 +247,8 @@ static void test_domain_configurations(void)
 
 int main(int argc, char **argv)
 {
+    int rc;
+
     printf("XENMEM_acquire_resource tests\n");
 
     xch = xc_interface_open(NULL, NULL, 0);
@@ -227,6 +262,10 @@ int main(int argc, char **argv)
     if ( !gh )
         err(1, "xengnttab_open");
 
+    rc = xc_physinfo(xch, &physinfo);
+    if ( rc )
+        err(1, "Failed to obtain physinfo");
+
     test_domain_configurations();
 
     return !!nr_failures;