libxc: use xc_vcpu_getinfo() instead of calling do_domctl()

The wrapper is there already, so better use it in place of
all the stuff required to issue a call to do_domctl() for
XEN_DOMCTL_getdomaininfo.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/libxc/xc_dom_boot.c

@@ -197,8 +197,8 @@ void *xc_dom_boot_domU_map(struct xc_dom_image *dom, xen_pfn_t pfn,
 
 int xc_dom_boot_image(struct xc_dom_image *dom)
 {
-    DECLARE_DOMCTL;
     DECLARE_HYPERCALL_BUFFER(vcpu_guest_context_any_t, ctxt);
+    xc_dominfo_t info;
     int rc;
 
     ctxt = xc_hypercall_buffer_alloc(dom->xch, ctxt, sizeof(*ctxt));
@@ -212,23 +212,22 @@ int xc_dom_boot_image(struct xc_dom_image *dom)
         return rc;
 
     /* collect some info */
-    domctl.cmd = XEN_DOMCTL_getdomaininfo;
-    domctl.domain = dom->guest_domid;
-    rc = do_domctl(dom->xch, &domctl);
-    if ( rc != 0 )
+    rc = xc_domain_getinfo(dom->xch, dom->guest_domid, 1, &info);
+    if ( rc < 0 )
     {
         xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
                      "%s: getdomaininfo failed (rc=%d)", __FUNCTION__, rc);
         return rc;
     }
-    if ( domctl.domain != dom->guest_domid )
+    if ( rc == 0 || info.domid != dom->guest_domid )
     {
         xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
-                     "%s: Huh? domid mismatch (%d != %d)", __FUNCTION__,
-                     domctl.domain, dom->guest_domid);
+                     "%s: Huh? No domains found (nr_domains=%d) "
+                     "or domid mismatch (%d != %d)", __FUNCTION__,
+                     rc, info.domid, dom->guest_domid);
         return -1;
     }
-    dom->shared_info_mfn = domctl.u.getdomaininfo.shared_info_frame;
+    dom->shared_info_mfn = info.shared_info_frame;
 
     /* sanity checks */
     if ( !xc_dom_compat_check(dom) )

tools/libxc/xc_domain_restore.c

@@ -1406,6 +1406,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
                       struct restore_callbacks *callbacks)
 {
     DECLARE_DOMCTL;
+    xc_dominfo_t info;
     int rc = 1, frc, i, j, n, m, pae_extended_cr3 = 0, ext_vcpucontext = 0;
     int vcpuextstate = 0;
     uint32_t vcpuextstate_size = 0;
@@ -1562,14 +1563,12 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
            ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT)); 
 
     /* Get the domain's shared-info frame. */
-    domctl.cmd = XEN_DOMCTL_getdomaininfo;
-    domctl.domain = (domid_t)dom;
-    if ( xc_domctl(xch, &domctl) < 0 )
+    if ( xc_domain_getinfo(xch, (domid_t)dom, 1, &info) != 1 )
     {
         PERROR("Could not get information on new domain");
         goto out;
     }
-    shared_info_frame = domctl.u.getdomaininfo.shared_info_frame;
+    shared_info_frame = info.shared_info_frame;
 
     /* Mark all PFNs as invalid; we allocate on demand */
     for ( pfn = 0; pfn < dinfo->p2m_size; pfn++ )

tools/libxc/xc_private.c

@@ -609,11 +609,9 @@ int xc_get_pfn_list(xc_interface *xch,
 
 long xc_get_tot_pages(xc_interface *xch, uint32_t domid)
 {
-    DECLARE_DOMCTL;
-    domctl.cmd = XEN_DOMCTL_getdomaininfo;
-    domctl.domain = (domid_t)domid;
-    return (do_domctl(xch, &domctl) < 0) ?
-        -1 : domctl.u.getdomaininfo.tot_pages;
+    xc_dominfo_t info;
+    return (xc_domain_getinfo(xch, domid, 1, &info) != 1) ?
+        -1 : info.nr_pages;
 }
 
 int xc_copy_to_domain_page(xc_interface *xch,