hw/xen: Implement GNTTABOP_query_size

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/hw/i386/kvm/xen_gnttab.c b/hw/i386/kvm/xen_gnttab.c
index b54a94e2bd..1e691ded32 100644
--- a/hw/i386/kvm/xen_gnttab.c
+++ b/hw/i386/kvm/xen_gnttab.c
@@ -211,3 +211,22 @@ int xen_gnttab_get_version_op(struct gnttab_get_version *get)
     get->version = 1;
     return 0;
 }
+
+int xen_gnttab_query_size_op(struct gnttab_query_size *size)
+{
+    XenGnttabState *s = xen_gnttab_singleton;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    if (size->dom != DOMID_SELF && size->dom != xen_domid) {
+        size->status = GNTST_bad_domain;
+        return 0;
+    }
+
+    size->status = GNTST_okay;
+    size->nr_frames = s->nr_frames;
+    size->max_nr_frames = s->max_frames;
+    return 0;
+}