From: Chris Wright <chrisw@sous-sol.org>
To: linux-kernel@vger.kernel.org
Cc: virtualization@lists.osdl.org, xen-devel@lists.xensource.com,
Ian Pratt <ian.pratt@xensource.com>,
Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Subject: [RFC PATCH 26/35] Add Xen subarch reboot support
Date: Tue, 09 May 2006 00:00:26 -0700 [thread overview]
Message-ID: <20060509085158.282993000@sous-sol.org> (raw)
In-Reply-To: 20060509084945.373541000@sous-sol.org
[-- Attachment #1: reboot --]
[-- Type: text/plain, Size: 6861 bytes --]
Add remote reboot capability, so that a virtual machine can be
rebooted, halted or 'powered off' by external management tools.
Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
TODO:
- move poweroff and halt to generic similar to c_a_d
arch/i386/kernel/Makefile | 1
drivers/xen/core/reboot.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 233 insertions(+)
arch/i386/kernel/Makefile | 1
drivers/xen/core/reboot.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 233 insertions(+)
--- linus-2.6.orig/arch/i386/kernel/Makefile
+++ linus-2.6/arch/i386/kernel/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_SCx200) += scx200.o
hw_irq-y := i8259.o
hw_irq-$(CONFIG_XEN) := ../../../drivers/xen/core/evtchn.o
+reboot-$(CONFIG_XEN) := ../../../drivers/xen/core/reboot.o
time-$(CONFIG_XEN) := ../../../drivers/xen/core/time.o
# vsyscall.o contains the vsyscall DSO images as __initdata.
--- /dev/null
+++ linus-2.6/drivers/xen/core/reboot.c
@@ -0,0 +1,232 @@
+#define __KERNEL_SYSCALLS__
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/unistd.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/sysrq.h>
+#include <linux/stringify.h>
+#include <linux/syscalls.h>
+#include <linux/cpu.h>
+#include <linux/kthread.h>
+
+#include <xen/evtchn.h>
+#include <xen/xenbus.h>
+#include <xen/xencons.h>
+
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/hypervisor.h>
+
+#if defined(__i386__) || defined(__x86_64__)
+/*
+ * Power off function, if any
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+#endif
+
+extern void ctrl_alt_del(void);
+
+#define SHUTDOWN_INVALID -1
+#define SHUTDOWN_POWEROFF 0
+#define SHUTDOWN_SUSPEND 2
+/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
+ * report a crash, not be instructed to crash!
+ * HALT is the same as POWEROFF, as far as we're concerned. The tools use
+ * the distinction when we return the reason code to them.
+ */
+#define SHUTDOWN_HALT 4
+
+void machine_emergency_restart(void)
+{
+ /* We really want to get pending console data out before we die. */
+ xencons_force_flush();
+ HYPERVISOR_sched_op(SCHEDOP_shutdown, SHUTDOWN_reboot);
+}
+
+void machine_restart(char * __unused)
+{
+ machine_emergency_restart();
+}
+
+void machine_halt(void)
+{
+ machine_power_off();
+}
+
+void machine_power_off(void)
+{
+ /* We really want to get pending console data out before we die. */
+ xencons_force_flush();
+ HYPERVISOR_sched_op(SCHEDOP_shutdown, SHUTDOWN_poweroff);
+}
+
+int reboot_thru_bios = 0; /* for dmi_scan.c */
+EXPORT_SYMBOL(machine_restart);
+EXPORT_SYMBOL(machine_halt);
+EXPORT_SYMBOL(machine_power_off);
+
+
+/******************************************************************************
+ * Stop/pickle callback handling.
+ */
+
+/* Ignore multiple shutdown requests. */
+static int shutting_down = SHUTDOWN_INVALID;
+static void __shutdown_handler(void *unused);
+static DECLARE_WORK(shutdown_work, __shutdown_handler, NULL);
+
+static int shutdown_process(void *__unused)
+{
+ static char *envp[] = { "HOME=/", "TERM=linux",
+ "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
+ static char *poweroff_argv[] = { "/sbin/poweroff", NULL };
+
+ if ((shutting_down == SHUTDOWN_POWEROFF) ||
+ (shutting_down == SHUTDOWN_HALT)) {
+ if (execve(poweroff_argv[0], poweroff_argv, envp) < 0) {
+ sys_reboot(LINUX_REBOOT_MAGIC1,
+ LINUX_REBOOT_MAGIC2,
+ LINUX_REBOOT_CMD_POWER_OFF,
+ NULL);
+ }
+ }
+
+ shutting_down = SHUTDOWN_INVALID; /* could try again */
+
+ return 0;
+}
+
+static void __shutdown_handler(void *unused)
+{
+ int err = 0;
+
+ if (shutting_down != SHUTDOWN_SUSPEND)
+ err = kernel_thread(shutdown_process, NULL,
+ CLONE_FS | CLONE_FILES);
+
+ if (err < 0) {
+ printk(KERN_WARNING "Error creating shutdown process (%d): "
+ "retrying...\n", -err);
+ schedule_delayed_work(&shutdown_work, HZ/2);
+ }
+}
+
+static void shutdown_handler(struct xenbus_watch *watch,
+ const char **vec, unsigned int len)
+{
+ char *str;
+ xenbus_transaction_t xbt;
+ int err;
+
+ if (shutting_down != SHUTDOWN_INVALID)
+ return;
+
+ again:
+ err = xenbus_transaction_start(&xbt);
+ if (err)
+ return;
+ str = (char *)xenbus_read(xbt, "control", "shutdown", NULL);
+ /* Ignore read errors and empty reads. */
+ if (XENBUS_IS_ERR_READ(str)) {
+ xenbus_transaction_end(xbt, 1);
+ return;
+ }
+
+ xenbus_write(xbt, "control", "shutdown", "");
+
+ err = xenbus_transaction_end(xbt, 0);
+ if (err == -EAGAIN) {
+ kfree(str);
+ goto again;
+ }
+
+ if (strcmp(str, "poweroff") == 0)
+ shutting_down = SHUTDOWN_POWEROFF;
+ else if (strcmp(str, "reboot") == 0)
+ ctrl_alt_del();
+ else if (strcmp(str, "suspend") == 0)
+ shutting_down = SHUTDOWN_SUSPEND;
+ else if (strcmp(str, "halt") == 0)
+ shutting_down = SHUTDOWN_HALT;
+ else {
+ printk("Ignoring shutdown request: %s\n", str);
+ shutting_down = SHUTDOWN_INVALID;
+ }
+
+ if (shutting_down != SHUTDOWN_INVALID)
+ schedule_work(&shutdown_work);
+
+ kfree(str);
+}
+
+static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
+ unsigned int len)
+{
+ char sysrq_key = '\0';
+ xenbus_transaction_t xbt;
+ int err;
+
+ again:
+ err = xenbus_transaction_start(&xbt);
+ if (err)
+ return;
+ if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) {
+ printk(KERN_ERR "Unable to read sysrq code in "
+ "control/sysrq\n");
+ xenbus_transaction_end(xbt, 1);
+ return;
+ }
+
+ if (sysrq_key != '\0')
+ xenbus_printf(xbt, "control", "sysrq", "%c", '\0');
+
+ err = xenbus_transaction_end(xbt, 0);
+ if (err == -EAGAIN)
+ goto again;
+
+#ifdef CONFIG_MAGIC_SYSRQ
+ if (sysrq_key != '\0')
+ handle_sysrq(sysrq_key, NULL, NULL);
+#endif
+}
+
+static struct xenbus_watch shutdown_watch = {
+ .node = "control/shutdown",
+ .callback = shutdown_handler
+};
+
+static struct xenbus_watch sysrq_watch = {
+ .node ="control/sysrq",
+ .callback = sysrq_handler
+};
+
+static int setup_shutdown_watcher(struct notifier_block *notifier,
+ unsigned long event,
+ void *data)
+{
+ int err;
+
+ err = register_xenbus_watch(&shutdown_watch);
+ if (err)
+ printk(KERN_ERR "Failed to set shutdown watcher\n");
+
+ err = register_xenbus_watch(&sysrq_watch);
+ if (err)
+ printk(KERN_ERR "Failed to set sysrq watcher\n");
+
+ return NOTIFY_DONE;
+}
+
+static int __init setup_shutdown_event(void)
+{
+ static struct notifier_block xenstore_notifier = {
+ .notifier_call = setup_shutdown_watcher
+ };
+ register_xenstore_notifier(&xenstore_notifier);
+ return 0;
+}
+
+subsys_initcall(setup_shutdown_event);
--
next prev parent reply other threads:[~2006-05-09 8:49 UTC|newest]
Thread overview: 189+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-09 8:49 [RFC PATCH 00/35] Xen i386 paravirtualization support Chris Wright
2006-05-09 7:00 ` [RFC PATCH 01/35] Add XEN config options and disable unsupported config options Chris Wright
2006-05-09 10:05 ` Adrian Bunk
2006-05-09 11:06 ` Ed Tomlinson
2006-05-09 12:45 ` Christian Limpach
2006-05-09 23:23 ` Chris Wright
2006-05-09 14:47 ` Daniel Walker
2006-05-09 15:16 ` Christian Limpach
2006-05-09 16:00 ` Daniel Walker
2006-05-09 23:25 ` Chris Wright
2006-05-09 16:42 ` Andi Kleen
2006-05-10 15:36 ` [Xen-devel] " Alan Cox
2006-05-10 15:48 ` Christian Limpach
2006-05-09 7:00 ` [RFC PATCH 02/35] Makefile support to build Xen subarch Chris Wright
2006-05-09 7:00 ` [RFC PATCH 03/35] Add Xen interface header files Chris Wright
2006-05-09 14:49 ` Martin J. Bligh
2006-05-09 17:54 ` Christian Limpach
2006-05-09 15:15 ` Christoph Hellwig
2006-05-09 19:35 ` Hollis Blanchard
2006-05-09 19:48 ` [Xen-devel] " Anthony Liguori
2006-05-09 22:34 ` Christoph Hellwig
2006-05-09 22:36 ` Ingo Oeser
2006-05-09 16:06 ` Daniel Walker
2006-05-09 16:18 ` Christian Limpach
2006-05-09 16:29 ` Daniel Walker
2006-05-09 7:00 ` [RFC PATCH 04/35] Hypervisor " Chris Wright
2006-05-09 22:43 ` Ingo Oeser
2006-05-09 23:01 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 05/35] Add sync bitops Chris Wright
2006-05-09 22:56 ` Christoph Lameter
2006-05-09 23:04 ` Andi Kleen
2006-05-09 23:07 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 06/35] Add vmlinuz build target Chris Wright
2006-05-09 7:00 ` [RFC PATCH 07/35] Make LOAD_OFFSET defined by subarch Chris Wright
2006-05-10 23:28 ` Zachary Amsden
2006-05-11 7:47 ` [Xen-devel] " Gerd Hoffmann
2006-05-11 8:51 ` Chris Wright
2006-05-11 9:06 ` Gerd Hoffmann
2006-05-11 16:43 ` Christian Limpach
2006-05-12 6:47 ` [Xen-devel] " Jan Beulich
2006-05-12 8:38 ` Christian Limpach
2006-05-09 7:00 ` [RFC PATCH 08/35] Add Xen-specific memory management definitions Chris Wright
2006-05-09 14:49 ` Martin J. Bligh
2006-05-09 17:44 ` Christian Limpach
2006-05-15 6:44 ` Pete Zaitcev
2006-05-15 7:04 ` Keir Fraser
2006-05-15 8:19 ` Christian Limpach
2006-05-17 16:06 ` Pete Zaitcev
2006-05-18 7:42 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 09/35] Change __FIXADDR_TOP to leave room for the hypervisor Chris Wright
2006-05-09 7:00 ` [RFC PATCH 10/35] Add a new head.S start-of-day file for booting on Xen Chris Wright
2006-05-09 7:00 ` [RFC PATCH 11/35] Add support for Xen to entry.S Chris Wright
2006-05-09 16:51 ` Andi Kleen
2006-05-09 7:00 ` [RFC PATCH 12/35] Add start-of-day setup hooks to subarch Chris Wright
2006-05-09 7:00 ` [RFC PATCH 13/35] Support loading an initrd when running on Xen Chris Wright
2006-05-09 7:00 ` [RFC PATCH 14/35] Subarch support for CPUID instruction Chris Wright
2006-05-09 7:00 ` [RFC PATCH 15/35] subarch support for controlling interrupt delivery Chris Wright
2006-05-09 14:49 ` Martin J. Bligh
2006-05-09 14:55 ` Nick Piggin
2006-05-09 15:51 ` Christian Limpach
2006-05-09 16:02 ` Martin J. Bligh
2006-05-09 16:07 ` Andi Kleen
2006-05-09 16:29 ` Christian Limpach
2006-05-09 16:31 ` Andi Kleen
2006-05-09 20:42 ` Christian Limpach
2006-05-09 21:56 ` Andi Kleen
2006-05-10 10:35 ` Christian Limpach
2006-05-10 10:54 ` Andi Kleen
2006-05-09 21:56 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 16/35] subarch support for interrupt and exception gates Chris Wright
2006-05-09 11:09 ` Andi Kleen
2006-05-09 12:55 ` Christian Limpach
2006-05-13 12:27 ` Andrew Morton
2006-05-15 18:30 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 17/35] Segment register changes for Xen Chris Wright
2006-05-09 7:16 ` Pavel Machek
2006-05-10 20:09 ` Andi Kleen
2006-05-10 20:30 ` Pavel Machek
2006-05-11 10:34 ` Avi Kivity
2006-05-11 10:41 ` Andi Kleen
2006-05-12 0:28 ` [Xen-devel] " Rusty Russell
2006-05-09 16:44 ` Andi Kleen
2006-05-18 20:20 ` Zachary Amsden
2006-05-18 20:41 ` Keir Fraser
2006-05-18 21:26 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 18/35] Support gdt/idt/ldt handling on Xen Chris Wright
2006-05-09 7:21 ` Pavel Machek
2006-05-10 20:23 ` Andi Kleen
2006-05-09 14:49 ` Martin J. Bligh
2006-05-09 18:14 ` Christian Limpach
2006-05-09 18:21 ` Martin Bligh
2006-05-09 7:00 ` [RFC PATCH 19/35] subarch support for control register accesses Chris Wright
2006-05-09 7:00 ` [RFC PATCH 20/35] subarch stack pointer update Chris Wright
2006-05-09 7:00 ` [RFC PATCH 21/35] subarch TLB support Chris Wright
2006-05-09 7:00 ` [RFC PATCH 22/35] subarch suport for idle loop (NO_IDLE_HZ for Xen) Chris Wright
2006-05-09 13:21 ` Andi Kleen
2006-05-09 15:13 ` Christian Limpach
2006-05-09 7:00 ` [RFC PATCH 23/35] Increase x86 interrupt vector range Chris Wright
2006-05-09 7:00 ` [RFC PATCH 24/35] Add support for Xen event channels Chris Wright
2006-05-12 21:41 ` Pavel Machek
2006-05-13 12:27 ` Andrew Morton
2006-05-13 13:02 ` Keir Fraser
2006-05-09 7:00 ` [RFC PATCH 25/35] Add Xen time abstractions Chris Wright
2006-05-09 16:23 ` Daniel Walker
2006-05-09 16:38 ` Christian Limpach
2006-05-09 19:27 ` Adrian Bunk
2006-05-09 21:50 ` Andi Kleen
2006-05-09 23:03 ` Ingo Oeser
2006-05-09 23:09 ` Andi Kleen
2006-05-09 23:13 ` Chris Wright
2006-05-12 21:44 ` Pavel Machek
2006-05-09 7:00 ` Chris Wright [this message]
2006-05-09 17:02 ` [RFC PATCH 26/35] Add Xen subarch reboot support Andi Kleen
2006-05-12 21:46 ` Pavel Machek
2006-05-12 21:57 ` Chris Wright
2006-05-09 7:00 ` [RFC PATCH 27/35] Add nosegneg capability to the vsyscall page notes Chris Wright
2006-05-09 7:00 ` [RFC PATCH 28/35] add support for Xen feature queries Chris Wright
2006-05-12 21:56 ` Pavel Machek
2006-05-09 7:00 ` [RFC PATCH 29/35] Add the Xen virtual console driver Chris Wright
2006-05-09 13:26 ` Andi Kleen
2006-05-09 15:03 ` Christian Limpach
2006-05-13 12:27 ` Andrew Morton
2006-05-13 12:51 ` Nick Piggin
2006-05-13 14:29 ` Andrew Morton
2006-05-13 14:43 ` Nick Piggin
2006-05-09 7:00 ` [RFC PATCH 30/35] Add apply_to_page_range() function Chris Wright
2006-05-09 7:00 ` [RFC PATCH 31/35] Add Xen grant table support Chris Wright
2006-05-09 7:00 ` [RFC PATCH 32/35] Add Xen driver utility functions Chris Wright
2006-05-09 19:48 ` Greg KH
2006-05-09 21:50 ` Andi Kleen
2006-05-09 7:00 ` [RFC PATCH 33/35] Add the Xenbus sysfs and virtual device hotplug driver Chris Wright
2006-05-09 16:06 ` Alexey Dobriyan
2006-05-09 16:28 ` Andi Kleen
2006-05-09 19:40 ` Greg KH
2006-05-09 21:53 ` Chris Wright
2006-05-09 22:01 ` Greg KH
2006-05-09 22:50 ` Chris Wright
2006-05-09 23:43 ` Anthony Liguori
2006-05-09 19:49 ` Greg KH
2006-05-09 19:58 ` Chris Wright
2006-05-13 12:28 ` Andrew Morton
2006-05-09 7:00 ` [RFC PATCH 34/35] Add the Xen virtual network device driver Chris Wright
2006-05-09 11:55 ` [Xen-devel] " Herbert Xu
2006-05-09 12:43 ` Christian Limpach
2006-05-09 13:01 ` Herbert Xu
2006-05-09 13:14 ` Andi Kleen
2006-05-09 13:16 ` Christian Limpach
2006-05-09 13:26 ` Herbert Xu
2006-05-09 14:00 ` Christian Limpach
2006-05-09 14:30 ` David Boutcher
2006-05-09 23:35 ` Chris Wright
2006-05-09 11:58 ` Christoph Hellwig
2006-05-09 23:37 ` Chris Wright
2006-05-09 18:56 ` Stephen Hemminger
2006-05-09 23:39 ` Chris Wright
2006-05-09 20:25 ` Stephen Hemminger
2006-05-09 20:26 ` Keir Fraser
2006-05-09 20:39 ` Stephen Hemminger
2006-05-09 20:46 ` Roland Dreier
2006-05-10 18:28 ` Andi Kleen
2006-05-11 0:33 ` Herbert Xu
2006-05-11 7:49 ` Keir Fraser
2006-05-11 8:04 ` Herbert Xu
2006-05-11 9:47 ` Andi Kleen
2006-05-11 16:18 ` Stephen Hemminger
2006-05-11 16:48 ` Rick Jones
2006-05-11 16:55 ` Stephen Hemminger
2006-05-11 17:30 ` Andi Kleen
2006-05-09 20:32 ` Chris Wright
2006-05-09 22:41 ` [Xen-devel] " Herbert Xu
2006-05-09 23:51 ` Chris Wright
2006-05-10 6:36 ` Keir Fraser
2006-05-09 7:00 ` [RFC PATCH 35/35] Add Xen virtual block " Chris Wright
2006-05-09 12:01 ` Christoph Hellwig
2006-05-09 14:49 ` [RFC PATCH 00/35] Xen i386 paravirtualization support Martin J. Bligh
2006-05-09 15:07 ` Christoph Hellwig
2006-05-09 15:12 ` Martin J. Bligh
2006-05-09 15:20 ` Andi Kleen
2006-05-09 15:22 ` Christoph Hellwig
2006-05-09 15:45 ` Pekka Enberg
2006-05-14 1:35 ` Andrew Morton
2006-05-15 21:01 ` Chris Wright
-- strict thread matches above, loose matches on Subject: below --
2006-03-22 6:30 Chris Wright
2006-03-22 6:31 ` [RFC PATCH 26/35] Add Xen subarch reboot support Chris Wright
2006-03-22 8:40 ` Arjan van de Ven
2006-03-22 10:22 ` Keir Fraser
2006-03-22 10:39 ` Arjan van de Ven
2006-03-22 10:52 ` Keir Fraser
2006-03-22 14:21 ` Andi Kleen
2006-03-22 20:59 ` Pavel Machek
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