[PATCH V2] libxl: support domainReset

[Jim Fehlig <jfehlig@xxxxxxxx>]

Currently, libxl does not provide a reset function, but domainReset
can be implemented in the libxl driver by forcibly destroying the
domain and starting it again.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---

This is essentially a V2 of a patch submitted quite some time ago

https://www.redhat.com/archives/libvir-list/2014-August/msg00077.html

The idea of implmenting domainReset in the libxl driver by forcibly
destroying the domain and starting it again was ACK'ed in principle
by Ian Campbell

https://www.redhat.com/archives/libvir-list/2014-August/msg00109.html

I never pushed the patch since it was not ACK'ed by a libvirt
maintainer and stumbled across it while cleaning up some of my
old branches.  The only change here is rebase against current
libvirt.git master.

 src/libxl/libxl_driver.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 12be816..671d336 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -1237,6 +1237,64 @@ libxlDomainReboot(virDomainPtr dom, unsigned int flags)
 }
 
 static int
+libxlDomainReset(virDomainPtr dom, unsigned int flags)
+{
+    libxlDriverPrivatePtr driver = dom->conn->privateData;
+    libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
+    virDomainObjPtr vm;
+    int ret = -1;
+
+    virCheckFlags(0, -1);
+
+    if (!(vm = libxlDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virDomainResetEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
+        goto cleanup;
+
+    if (!virDomainObjIsActive(vm)) {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("Domain is not running"));
+        goto endjob;
+    }
+
+    /*
+     * The semantics of reset can be achieved by forcibly destroying
+     * the domain and starting it again.
+     */
+    if (libxl_domain_destroy(cfg->ctx, vm->def->id, NULL) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Failed to destroy domain '%d' before reset"),
+                       vm->def->id);
+        goto endjob;
+    }
+
+    libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_DESTROYED);
+
+    if (libxlDomainStart(driver, vm, false, -1) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Failed to start domain '%d' after reset"),
+                       vm->def->id);
+        goto endjob;
+    }
+
+    ret = 0;
+
+ endjob:
+    if (!libxlDomainObjEndJob(driver, vm))
+        vm = NULL;
+
+ cleanup:
+    if (vm)
+        virObjectUnlock(vm);
+    virObjectUnref(cfg);
+    return ret;
+}
+
+static int
 libxlDomainDestroyFlags(virDomainPtr dom,
                         unsigned int flags)
 {
@@ -5066,6 +5124,7 @@ static virHypervisorDriver libxlHypervisorDriver = {
     .domainShutdown = libxlDomainShutdown, /* 0.9.0 */
     .domainShutdownFlags = libxlDomainShutdownFlags, /* 0.9.10 */
     .domainReboot = libxlDomainReboot, /* 0.9.0 */
+    .domainReset = libxlDomainReset, /* 1.2.8 */
     .domainDestroy = libxlDomainDestroy, /* 0.9.0 */
     .domainDestroyFlags = libxlDomainDestroyFlags, /* 0.9.4 */
     .domainGetOSType = libxlDomainGetOSType, /* 0.9.0 */
-- 
2.3.7

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