[v4,7/8] libxc: add libxc support for setting grant table resource limits

Commit Message

Juergen Gross Sept. 7, 2017, 1:47 p.m. UTC

Add a new libxc function xc_domain_set_gnttbl_limits() setting the
limits for the maximum numbers of grant table frames and maptrack
frames of a domain.

Signed-off-by: Juergen Gross <[e-mail]>
Reviewed-by: Paul Durrant <[e-mail]>
Acked-by: Wei Liu <[e-mail]>
---
V4:
- use domid_t (Wei Liu)
---
 tools/libxc/include/xenctrl.h | 14 ++++++++++++++
 tools/libxc/xc_domain.c       | 13 +++++++++++++
 2 files changed, 27 insertions(+)

Patch

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 43151cb415..ab34fb4f70 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1064,6 +1064,20 @@  int xc_domain_set_virq_handler(xc_interface *xch, uint32_t domid, int virq);
 int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
                              uint32_t max_port);
 
+/**
+ * Set the maximum number of grant frames and/or maptrack frames a domain
+ * can have. Can only be used at domain setup time. A zero value means
+ * no change.
+ *
+ * @param xch a handle to an open hypervisor interface
+ * @param domid the domain id
+ * @param grant_frames max. number of grant frames
+ * @param maptrack_frames max. number of maptrack frames
+ */
+int xc_domain_set_gnttab_limits(xc_interface *xch, domid_t domid,
+                                uint32_t grant_frames,
+                                uint32_t maptrack_frames);
+
 /*
  * CPUPOOL MANAGEMENT FUNCTIONS
  */
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 3bab4e8bab..41b42d6637 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -2268,6 +2268,19 @@  int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
     return do_domctl(xch, &domctl);
 }
 
+int xc_domain_set_gnttab_limits(xc_interface *xch, domid_t domid,
+                                uint32_t grant_frames,
+                                uint32_t maptrack_frames)
+{
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_set_gnttab_limits;
+    domctl.domain = domid;
+    domctl.u.set_gnttab_limits.grant_frames = grant_frames;
+    domctl.u.set_gnttab_limits.maptrack_frames = maptrack_frames;
+    return do_domctl(xch, &domctl);
+}
+
 /* Plumbing Xen with vNUMA topology */
 int xc_domain_setvnuma(xc_interface *xch,
                        uint32_t domid,