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Re: [Xen-devel] [PATCH for 4.6 v2 3/3] xl/libxl: disallow saving a guest with vNUMA configured



On 09/09/2015 01:03 PM, Wei Liu wrote:
This is due to migration v2 frame record doesn't contain node
information.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Cc: andrew.cooper3@xxxxxxxxxx
---
  docs/man/xl.cfg.pod.5   |  2 ++
  tools/libxl/libxl_dom.c | 14 ++++++++++++++
  2 files changed, 16 insertions(+)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index 80e51bb..dbd0700 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -263,6 +263,8 @@ virtual node.
Note that virtual NUMA for PV guest is not yet supported, because
  there is an issue with cpuid handling that affects PV virtual NUMA.
+Further more, guest with virtual NUMA cannot be saved or migrated
+because node information of guest frames is not preserved.

Should we also issue a warning during startup if nomigrate is not set?

-boris

Each B<VNODE_SPEC> is a list, which has a form of
  "[VNODE_CONFIG_OPTION,VNODE_CONFIG_OPTION, ... ]"  (without quotes).
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index c2518a3..5dc4d3a 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -24,6 +24,7 @@
  #include <xen/hvm/hvm_info_table.h>
  #include <xen/hvm/hvm_xs_strings.h>
  #include <xen/hvm/e820.h>
+#include <xen/errno.h>
libxl_domain_type libxl__domain_type(libxl__gc *gc, uint32_t domid)
  {
@@ -1612,6 +1613,7 @@ void libxl__domain_save(libxl__egc *egc, 
libxl__domain_suspend_state *dss)
      const libxl_domain_remus_info *const r_info = dss->remus;
      libxl__srm_save_autogen_callbacks *const callbacks =
          &dss->sws.shs.callbacks.save.a;
+    unsigned int nr_vnodes = 0, nr_vmemranges = 0, nr_vcpus = 0;
dss->rc = 0;
      logdirty_init(&dss->logdirty);
@@ -1636,6 +1638,18 @@ void libxl__domain_save(libxl__egc *egc, 
libxl__domain_suspend_state *dss)
            | (debug ? XCFLAGS_DEBUG : 0)
            | (dss->hvm ? XCFLAGS_HVM : 0);
+ /* Disallow saving a guest with vNUMA configured because migration
+     * v2 record doesn't contain node information for guest frame.
+     */
+    rc = xc_domain_getvnuma(CTX->xch, domid, &nr_vnodes, &nr_vmemranges,
+                            &nr_vcpus, NULL, NULL, NULL);
+    assert(rc == -1 && (errno == XEN_ENOBUFS || errno == XEN_EOPNOTSUPP));
+    if (errno == XEN_ENOBUFS && nr_vnodes) {
+        LOG(ERROR, "Cannot save a guest with vNUMA configured");
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
      dss->guest_evtchn.port = -1;
      dss->guest_evtchn_lockfd = -1;
      dss->guest_responded = 0;


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