[Xen-changelog] [xen-unstable] pv-on-hvm: Signal crash to Xen tools when HVM guest panics.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1202899329 0
# Node ID 27314cfbcefe8ee261da3ea827eb8336c32ad987
# Parent  e8539917376901e768e14a078adf6d1b6af278cd
pv-on-hvm: Signal crash to Xen tools when HVM guest panics.

Attached patch adds a function to automatically dump core file when
guest linux on HVM domain panics, in the same way as PV domain.

I tested this patch with kernel 2.6.9 and 2.6.18 on both of x86 and
ia64 (to buid for ia64, some patches in the ia64 tree are needed) by
the following steps, and confirmed it works well:

1. Build xen-platform-pci.ko.
2. In /etc/xen/xend-config.sxp, set (enable-dump yes).
3. On guest linux, execute insmod:
   # insmod xen-platform-pci.ko
4. When guest linux panics, a core file is dumped.

Signed-off-by: Tetsu Yamamoto <yamamoto.tetsu@xxxxxxxxxxxxxx>
---
 unmodified_drivers/linux-2.6/platform-pci/Kbuild          |    1 
 unmodified_drivers/linux-2.6/platform-pci/panic-handler.c |   54 ++++++++++++++
 unmodified_drivers/linux-2.6/platform-pci/platform-pci.c  |    4 +
 3 files changed, 59 insertions(+)

diff -r e85399173769 -r 27314cfbcefe 
unmodified_drivers/linux-2.6/platform-pci/Kbuild
--- a/unmodified_drivers/linux-2.6/platform-pci/Kbuild  Tue Feb 12 16:59:08 
2008 +0000
+++ b/unmodified_drivers/linux-2.6/platform-pci/Kbuild  Wed Feb 13 10:42:09 
2008 +0000
@@ -7,6 +7,7 @@ xen-platform-pci-objs := evtchn.o platfo
 xen-platform-pci-objs := evtchn.o platform-pci.o gnttab.o xen_support.o
 xen-platform-pci-objs += features.o platform-compat.o
 xen-platform-pci-objs += reboot.o machine_reboot.o
+xen-platform-pci-objs += panic-handler.o
 
 xen-platform-pci-objs += ../xenbus/xenbus_comms.o
 xen-platform-pci-objs += ../xenbus/xenbus_xs.o
diff -r e85399173769 -r 27314cfbcefe 
unmodified_drivers/linux-2.6/platform-pci/panic-handler.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/unmodified_drivers/linux-2.6/platform-pci/panic-handler.c Wed Feb 13 
10:42:09 2008 +0000
@@ -0,0 +1,54 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <asm/hypervisor.h>
+
+MODULE_LICENSE("GPL");
+
+#ifdef __ia64__
+static void
+xen_panic_hypercall(struct unw_frame_info *info, void *arg)
+{
+       current->thread.ksp = (__u64)info->sw - 16;
+       HYPERVISOR_shutdown(SHUTDOWN_crash);
+       /* we're never actually going to get here... */
+}
+#endif
+
+static int
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+#ifdef __ia64__
+       unw_init_running(xen_panic_hypercall, NULL);
+#else /* !__ia64__ */
+       HYPERVISOR_shutdown(SHUTDOWN_crash);
+#endif
+       /* we're never actually going to get here... */
+       return NOTIFY_DONE;
+}
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+static struct notifier_block xen_panic_block = {
+       xen_panic_event, NULL, 0 /* try to go last */
+};
+#else
+static struct notifier_block xen_panic_block = {
+       .notifier_call= xen_panic_event,
+       .next= NULL,
+       .priority= 0/* try to go last */
+};
+#endif /*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)*/
+
+static int __init setup_panic_event(void)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+       notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+#else
+       atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+#endif /*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)*/
+       return 0;
+}
+
+int xen_panic_handler_init(void)
+{
+       return setup_panic_event();
+}
diff -r e85399173769 -r 27314cfbcefe 
unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
--- a/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c  Tue Feb 12 
16:59:08 2008 +0000
+++ b/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c  Wed Feb 13 
10:42:09 2008 +0000
@@ -249,6 +249,7 @@ int xen_irq_init(struct pci_dev *pdev);
 int xen_irq_init(struct pci_dev *pdev);
 int xenbus_init(void);
 int xen_reboot_init(void);
+int xen_panic_handler_init(void);
 int gnttab_init(void);
 
 static int __devinit platform_pci_init(struct pci_dev *pdev,
@@ -315,6 +316,9 @@ static int __devinit platform_pci_init(s
                goto out;
 
        if ((ret = xen_reboot_init()))
+               goto out;
+
+       if ((ret = xen_panic_handler_init()))
                goto out;
 
  out:

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