[08/16] xen: destroy_hvm_domain: Try xendevicemodel_shutdown

Commit Message

Ian Jackson April 24, 2018, 5:58 p.m. UTC

xc_interface_open etc. is not going to work if we have dropped
privilege, but xendevicemodel_shutdown will if everything is new
enough.

xendevicemodel_shutdown is only availabe in Xen 4.10 and later, so
provide a stub for earlier versions.

Signed-off-by: Ian Jackson <[e-mail]>
Reviewed-by: Anthony PERARD <[e-mail]>
---
v6.1: Fix { } style issue
v6: Do not print message about harmless condition in ENOTTY case.
v2: Add compatibility stub for Xen < 4.10.
    Fix coding style.
---
 hw/i386/xen/xen-hvm.c       | 12 ++++++++++++
 include/hw/xen/xen_common.h |  7 +++++++
 2 files changed, 19 insertions(+)

Patch

diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 3590d99..fb727bc 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -1386,9 +1386,21 @@  void destroy_hvm_domain(bool reboot)
 {
     xc_interface *xc_handle;
     int sts;
+    int rc;
 
     unsigned int reason = reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff;
 
+    if (xen_dmod) {
+        rc = xendevicemodel_shutdown(xen_dmod, xen_domid, reason);
+        if (!rc) {
+            return;
+        }
+        if (errno != ENOTTY /* old Xen */) {
+            perror("xendevicemodel_shutdown failed");
+        }
+        /* well, try the old thing then */
+    }
+
     xc_handle = xc_interface_open(0, 0, 0);
     if (xc_handle == NULL) {
         fprintf(stderr, "Cannot acquire xenctrl handle\n");
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 60c4ebb..4bd30a3 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -108,6 +108,13 @@  static inline int xentoolcore_restrict_all(domid_t domid)
     return -1;
 }
 
+static inline int xendevicemodel_shutdown(xendevicemodel_handle *dmod,
+                                          domid_t domid, unsigned int reason)
+{
+    errno = ENOTTY;
+    return -1;
+}
+
 #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 41000 */
 
 #include <xentoolcore.h>