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Konrad Rzeszutek Wilk cb6b6df111 xen/pv-on-hvm kexec: add quirk for Xen 3.4 and shutdown watches. 
The commit 254d1a3f02, titled
"xen/pv-on-hvm kexec: shutdown watches from old kernel" assumes that the
XenBus backend can deal with reading of values from:
 "control/platform-feature-xs_reset_watches":

    ... a patch for xenstored is required so that it
    accepts the XS_RESET_WATCHES request from a client (see changeset
    23839:42a45baf037d in xen-unstable.hg). Without the patch for xenstored
    the registration of watches will fail and some features of a PVonHVM
    guest are not available. The guest is still able to boot, but repeated
    kexec boots will fail."

Sadly this is not true when using a Xen 3.4 hypervisor and booting a PVHVM
guest. We end up hanging at:

  err = xenbus_scanf(XBT_NIL, "control",
                        "platform-feature-xs_reset_watches", "%d", &supported);

This can easily be seen with guests hanging at xenbus_init:

NX (Execute Disable) protection: active
SMBIOS 2.4 present.
DMI: Xen HVM domU, BIOS 3.4.0 05/13/2011
Hypervisor detected: Xen HVM
Xen version 3.4.
Xen Platform PCI: I/O protocol version 1
... snip ..
calling  xenbus_init+0x0/0x27e @ 1

Reverting the commit or using the attached patch fixes the issue. This fix
checks whether the hypervisor is older than 4.0 and if so does not try to
perform the read.

Fixes-Oracle-Bug: 14708233
CC: stable@vger.kernel.org
Acked-by: Olaf Hering <olaf@aepfle.de>
[v2: Added a comment in the source code]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-10-12 08:49:21 -04:00
..
accessibility
acpi Merge branch 'drm-fixes-3.6' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2012-08-22 09:18:49 +10:00
amba
ata libata: Add a space to " 2GB ATA Flash Disk" DMA blacklist entry 2012-08-25 10:16:45 -04:00
atm drivers/atm/iphase.c: fix error return code 2012-08-06 13:29:57 -07:00
auxdisplay
base mm: cma: fix alignment requirements for contiguous regions 2012-08-28 21:01:01 +02:00
bcma bcma: BCM43228 support 2012-08-02 13:51:46 -04:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2012-08-25 11:36:43 -07:00
bluetooth Bluetooth: add support for atheros 0489:e057 2012-08-06 15:33:05 -03:00
cdrom
char drm/i915: fix hsw uncached pte 2012-08-17 09:21:35 +02:00
clk clk: validate pointer in __clk_disable() 2012-07-30 17:25:13 -07:00
clocksource cs5535-clockevt: typo, it's MFGPT, not MFPGT 2012-08-21 16:45:02 -07:00
connector
cpufreq Merge branch 'imx/fixes-for-3.6' of git://git.linaro.org/people/shawnguo/linux-2.6 into fixes 2012-08-23 17:02:42 +02:00
cpuidle cpuidle: Prevent null pointer dereference in cpuidle_coupled_cpu_notify 2012-08-17 19:37:08 +02:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2012-08-23 21:58:04 -07:00
dca
devfreq
dio
dma dma: tegra: enable/disable dma clock 2012-08-13 10:15:22 +05:30
edac
eisa
extcon extcon: extcon_gpio: Replace gpio_request_one by devm_gpio_request_one 2012-08-16 10:29:08 -07:00
firewire
firmware This patch series contains a major revamp of how we collect entropy 2012-07-31 19:07:42 -07:00
gpio gpio: rdc321x: Prevent removal of modules exporting active GPIOs 2012-09-01 12:52:24 +02:00
gpu drm: Add EDID_QUIRK_FORCE_REDUCED_BLANKING for ASUS VW222S 2012-08-30 14:14:12 +10:00
hid Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2012-09-07 12:29:38 -07:00
hsi
hv This patch series contains a major revamp of how we collect entropy 2012-07-31 19:07:42 -07:00
hwmon hwmon: (asus_atk0110) Add quirk for Asus M5A78L 2012-08-22 22:33:31 -07:00
hwspinlock
i2c i2c: tegra: protect suspend/resume callbacks with CONFIG_PM_SLEEP 2012-08-18 20:45:09 +02:00
ide ide: fix generic_ide_suspend/resume Oops 2012-08-21 14:54:42 -07:00
idle intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it. 2012-08-17 19:37:14 +02:00
ieee802154
iio iio: lm3533-als: Fix build warnings 2012-08-16 20:24:38 +01:00
infiniband Merge branches 'cma', 'ipoib', 'misc', 'mlx4', 'ocrdma', 'qib' and 'srp' into for-next 2012-08-16 09:38:39 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-09-08 16:20:59 -07:00
iommu iommu/amd: Fix wrong check for ARRAY_SIZE() 2012-08-10 11:34:08 +02:00
isdn mISDN: Bugfix for layer2 fixed TEI mode 2012-08-06 13:22:50 -07:00
leds leds: renesas: fix error handling 2012-08-13 14:34:02 +08:00
lguest
macintosh
md md/raid10: fix problem with on-stack allocation of r10bio structure. 2012-08-18 09:51:42 +10:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-08-21 16:54:38 -07:00
memory
memstick
message drivers/message/i2o/i2o_config.c: bound allocation 2012-07-30 17:25:17 -07:00
mfd More USB patches for 3.6-rc3 2012-08-20 13:14:22 -07:00
misc drivers/misc/sgi-xp/xpc_uv.c: SGI XPC fails to load when cpu 0 is out of IRQ resources 2012-08-21 16:45:03 -07:00
mmc mmc: omap: fix broken PIO mode 2012-09-04 13:58:11 -04:00
mtd UBI: fix a horrible memory deallocation bug 2012-09-04 09:40:26 +03:00
net Merge branch 'xenarm-for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm into stable/for-linus-3.7 2012-09-26 16:43:35 -04:00
nfc
nubus
of dt: introduce for_each_available_child_of_node, of_get_next_available_child 2012-08-20 02:16:00 -07:00
oprofile
parisc
parport
pci Merge branch 'stable/late-swiotlb.v3.3' into stable/for-linus-3.7 2012-09-22 20:01:24 -04:00
pcmcia
pinctrl pinctrl/nomadik: add kp_b_2 keyboard function group list 2012-08-17 11:09:58 +02:00
platform ideapad: add Lenovo IdeaPad Z570 support (part 3) 2012-08-20 12:44:41 -04:00
pnp
power Merge branch 'for-linus-3.6' of git://dev.laptop.org/users/dilinger/linux-olpc 2012-08-02 11:52:39 -07:00
pps pps: return PTR_ERR on error in device_create 2012-07-30 17:25:21 -07:00
ps3
ptp
pwm pwm: Improve Kconfig help text 2012-08-20 11:58:43 +02:00
rapidio rapidio/tsi721: fix unused variable compiler warning 2012-08-21 16:45:03 -07:00
regulator regulator: twl-regulator: fix up VINTANA1/VINTANA2 2012-08-15 17:19:01 +01:00
remoteproc
rpmsg
rtc Fixes for AT91 related to: 2012-08-27 17:07:37 -07:00
s390 s390/dasd: fix ioctl return value 2012-08-28 10:08:31 +02:00
sbus
scsi Merge branch 'for-3.6/core' of git://git.kernel.dk/linux-block 2012-08-01 09:02:41 -07:00
sfi
sh sh: intc: Handle domain association for sparseirq pre-allocated vectors. 2012-08-09 13:21:05 +09:00
sn
spi Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2012-08-25 11:45:04 -07:00
ssb
staging More USB patches for 3.6-rc3 2012-08-20 13:14:22 -07:00
target target: Remove unused se_cmd.cmd_spdtl 2012-08-21 14:27:35 -07:00
tc
thermal The tag contains just a few battery-related changes for v3.6. It's is 2012-07-31 18:08:25 -07:00
tty xen/hvc: handle backend CLOSED without CLOSING 2012-10-04 11:30:29 -04:00
uio
usb More USB patches for 3.6-rc3 2012-08-20 13:14:22 -07:00
uwb
vfio vfio: grab vfio_device reference *before* exposing the sucker via fd_install() 2012-08-22 10:26:42 -04:00
vhost tcm_vhost: Fix vhost_scsi_target structure alignment 2012-08-20 14:52:11 -07:00
video OMAPFB: fix framebuffer console colors 2012-08-23 12:37:22 +00:00
virt
virtio
vlynq
vme
w1 1-Wire: Add support for the maxim ds1825 temperature sensor 2012-08-16 12:33:59 -07:00
watchdog watchdog: da9052: Remove duplicate inclusion of delay.h 2012-08-29 17:13:06 +02:00
xen xen/pv-on-hvm kexec: add quirk for Xen 3.4 and shutdown watches. 2012-10-12 08:49:21 -04:00
zorro
Kconfig vfio: VFIO core 2012-07-31 08:16:22 -06:00
Makefile vfio: VFIO core 2012-07-31 08:16:22 -06:00