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libxl: add support for soft reset

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The pvops Linux kernel implements machine_ops.crash_shutdown as

static void xen_hvm_crash_shutdown(struct pt_regs *regs)
{
        native_machine_crash_shutdown(regs);
        xen_reboot(SHUTDOWN_soft_reset);
}

but currently the libxl driver does not handle the soft reset
shutdown event. As a result, the guest domain never proceeds
past xen_reboot(), making it impossible for HVM domains to save
a crash dump using kexec.

This patch adds support for handling the soft reset event by
calling libxl_domain_soft_reset() and re-enabling domain death
events, which is similar to the xl tool handling of soft reset
shutdown event.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jim Fehlig 2018-10-31 11:03:37 -06:00
parent 82452a5d7f
commit da4b0fd9d3
1 changed files with 30 additions and 0 deletions
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30
src/libxl/libxl_domain.c
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@ -471,8 +471,10 @@ libxlDomainShutdownThread(void *opaque)
virObjectEventPtr dom_event = NULL;
libxl_shutdown_reason xl_reason = ev->u.domain_shutdown.shutdown_reason;
libxlDriverConfigPtr cfg;
libxl_domain_config d_config;
cfg = libxlDriverConfigGet(driver);
libxl_domain_config_init(&d_config);
vm = virDomainObjListFindByID(driver->domains, ev->domid);
if (!vm) {
@ -563,6 +565,34 @@ libxlDomainShutdownThread(void *opaque)
* Similar to the xl implementation, ignore SUSPEND. Any actions needed
* after calling libxl_domain_suspend() are handled by it's callers.
*/
#ifdef LIBXL_HAVE_SOFT_RESET
} else if (xl_reason == LIBXL_SHUTDOWN_REASON_SOFT_RESET) {
libxlDomainObjPrivatePtr priv = vm->privateData;
if (libxl_retrieve_domain_configuration(cfg->ctx, vm->def->id,
&d_config) != 0) {
VIR_ERROR(_("Failed to retrieve config for VM '%s'. "
"Unable to perform soft reset. Destroying VM"),
vm->def->name);
libxlDomainShutdownHandleDestroy(driver, vm);
goto endjob;
}
if (priv->deathW) {
libxl_evdisable_domain_death(cfg->ctx, priv->deathW);
priv->deathW = NULL;
}
if (libxl_domain_soft_reset(cfg->ctx, &d_config, vm->def->id,
NULL, NULL) != 0) {
VIR_ERROR(_("Failed to soft reset VM '%s'. Destroying VM"),
vm->def->name);
libxlDomainShutdownHandleDestroy(driver, vm);
goto endjob;
}
libxl_evenable_domain_death(cfg->ctx, vm->def->id, 0, &priv->deathW);
libxl_domain_unpause(cfg->ctx, vm->def->id);
#endif
} else {
VIR_INFO("Unhandled shutdown_reason %d", xl_reason);
}