Sending sys-requests on Xen is different from the usual keyboard based
ways. For xen, we need to add a xenstored node which the guest pulls the
sysrq information from.
This patch implements said interface by introducing a new human monitor
command to use it. It's purely optional.
Signed-off-by: Alexander Graf <ag...@suse.de>
---
hmp-commands.hx | 24 ++++++++++++++++++++++++
hw/xen.h | 2 ++
hw/xen_domainbuild.c | 8 ++++++++
monitor.c | 8 ++++++++
4 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 81999aa..40fdd00 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -436,6 +436,30 @@ This command is useful to send keys that your graphical
user interface
intercepts at low level, such as @code{ctrl-alt-f1} in X Window.
ETEXI
+#if defined(CONFIG_XEN) || defined(CONFIG_XENNER)
+ {
+ .name = "xen_sysrq",
+ .args_type = "string:s",
+ .params = "key",
+ .help = "send sysrq to the Xen VM",
+ .mhandler.cmd = do_xen_sysrq,
+ },
+#endif
+
+STEXI
+...@item xen_sysrq @var{key}
+...@findex xen_sysrq
+
+Send @var{key} as sys-request to the Xen VM. This is the equivalent to
+alt-pri...@var{key} in normal Linux guests. Example:
+...@example
+xen_sysrq s
+...@end example
+
+Please keep in mind that this is the only way of sending sys-requests to
+Xen PV machines. The usual alt-pri...@var{key} way does not work.
+ETEXI
+
{
.name = "system_reset",
.args_type = "",
diff --git a/hw/xen.h b/hw/xen.h
index 780dcf7..f2ac576 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -18,4 +18,6 @@ enum xen_mode {
extern uint32_t xen_domid;
extern enum xen_mode xen_mode;
+void xen_sysrq(const char *sysrq);
+
#endif /* QEMU_HW_XEN_H */
diff --git a/hw/xen_domainbuild.c b/hw/xen_domainbuild.c
index 7f1fd66..49962db 100644
--- a/hw/xen_domainbuild.c
+++ b/hw/xen_domainbuild.c
@@ -211,6 +211,14 @@ static int xen_domain_watcher(void)
_exit(0);
}
+void xen_sysrq(const char *sysrq)
+{
+ void *dom;
+
+ dom = xs_get_domain_path(xenstore, xen_domid);
+ xenstore_write_str(dom, "control/sysrq", sysrq);
+}
+
/* normal cleanup */
static void xen_domain_cleanup(void)
{
diff --git a/monitor.c b/monitor.c
index 61607c5..99aae01 100644
--- a/monitor.c
+++ b/monitor.c
@@ -30,6 +30,7 @@
#include "hw/pci.h"
#include "hw/watchdog.h"
#include "hw/loader.h"
+#include "hw/xen.h"
#include "gdbstub.h"
#include "net.h"
#include "net/slirp.h"
@@ -1639,6 +1640,13 @@ static void release_keys(void *opaque)
}
}
+#if defined(CONFIG_XEN) || defined(CONFIG_XENNER)
+static void do_xen_sysrq(Monitor *mon, const QDict *qdict)
+{
+ xen_sysrq(strdup(qdict_get_str(qdict, "string")));
+}
+#endif
+
static void do_sendkey(Monitor *mon, const QDict *qdict)
{
char keyname_buf[16];
--
1.6.0.2
