similar to: [PATCH] linux-2.6.18/xenbus_dev: add missing error checks to watch handling

Hello, This patch allows userspace tools on a domU to setup a watch on the xenstore. It does this by intercepting XS_WATCH requests written to /proc/xen/xenbus and then re-submitting the request to the in-kernel xenstore interface, in linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c. When a callback occurs, an in-kernel function is invoked, which then reconstructs a response in the format

Dear xen-devel, There''s a race condition in xenfs (xenstore driver) that causes userspace utility xenstore-watch to crash. Normally, the userspace process gets an "OK" from xenfs and then the watch fires immediately after. Occasionally, this happens the other way around: the watch fires before the driver sends "OK", which confuses the xenstore-watch client. It seems

So far only the watch path was checked to be zero terminated, while the watch token was merely assumed to be. Signed-off-by: Jan Beulich <jbeulich@suse.com> --- drivers/xen/xenbus/xenbus_dev_frontend.c | 4 ++++ 1 file changed, 4 insertions(+) --- 3.3-rc1/drivers/xen/xenbus/xenbus_dev_frontend.c +++ 3.3-rc1-xenbus-dev-write-watch/drivers/xen/xenbus/xenbus_dev_frontend.c @@ -369,6

Signed-off-by: Jan Beulich <jbeulich@novell.com> Index: head-2007-02-27/drivers/char/mem.c =================================================================== --- head-2007-02-27.orig/drivers/char/mem.c 2007-03-05 10:00:18.000000000 +0100 +++ head-2007-02-27/drivers/char/mem.c 2007-02-27 16:27:37.000000000 +0100 @@ -787,7 +787,7 @@ static const struct file_operations mem_ .open =

Hi guys, I updated the latest xen hg repository, and found it failed to compile, because of an missing head file xenbus_dev.h. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

It seems that xenstore watches do not work from domU userspace (they obviously do for drivers). In some preliminary debugging of this, there are two aspects of the failure: not sending the watch to xenstore and not handling watch events for userspace watches. The former can be easily fixed by adding the missing ''case XS_WATCH:'' to xenbus_dev_write() in xenbus_dev.c. The

Add xs_reset_watches function to shutdown watches from old kernel after kexec boot. The old kernel does not unregister all watches in the shutdown path. They are still active, the double registration can not be detected by the new kernel. When the watches fire, unexpected events will arrive and the xenwatch thread will crash (jumps to NULL). An orderly reboot of a hvm guest will destroy the

Hi, xenstore fails to build: init-xenstore-domain.c:11:32: error: xen/sys/xenbus_dev.h: No such file or directory init-xenstore-domain.c: In function ''build'': init-xenstore-domain.c:37: error: ''IOCTL_XENBUS_BACKEND_SETUP'' undeclared (first use in this function) Christoph -- ---to satisfy European Law for business letters: Advanced Micro Devices GmbH

Is it supposed to be possible to write to the same struct file instance from multiple threads/processes? Looking at xenbus_dev_write() I can''t see how such writes would be serialized, yet assuming that user mode code always writes full messages it would seem consistent to allow such. Thanks, Jan _______________________________________________ Xen-devel mailing list

Package: xen-hypervisor-4.6-amd64 Version: 4.6.0-1 Severity: normal Dear maintaners, I was using XEN 4.4 on that machine ("unstable") and want to switch to 4.6. All xen stuff was uninstalled (XEN 4.4), the machine restarted before installing 4.6. When I uninstall XEN 4.4 (libxenlight4.4) it deinstall also part of QEMU and when I reinstall QEMU libxenlight-4.4 aws reinstalled. First

This makes debugging with DP tracing a lot harder to interpret, so name each i2c based off the name of the encoder that it's for Signed-off-by: Lyude Paul <lyude at redhat.com> --- drivers/gpu/drm/nouveau/dispnv04/disp.c | 2 +- drivers/gpu/drm/nouveau/dispnv50/disp.c | 2 +- drivers/gpu/drm/nouveau/nouveau_connector.c | 12 ++++++++++--

Originally I was just going to be adding dp_mst_status for nouveau until Daniel Stone pointed out that we should probably just make this so it's magically added for every DRM driver that's using the DRM DP MST helpers. So, let's do that! Signed-off-by: Lyude Paul <lyude at redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com> Cc: Daniel Stone <daniel

Linus et al, Here are the ocfs2 updates for 2.6.35. There are two major changes. Mark added allocation reservations to our node-local allocators. This gets us much more contiguousness when many processes are growing files in parallel. On the other end of contiguousness, ocfs2 has had a major limitation since the beginning. When ocfs2 needs new inodes, it has always grown its metadata

All, We are pleased to announce the release of OCFS2 1.4.10-1 and OCFS2 tools 1.6.3-2 for Oracle Linux 5 Update 7 and higher and Redhat Enterprise Linux 5 Update 7 and higher. Oracle's Unbreakable Linux Network users who are subscribing to the "OCFS2 1.4 packages for Enterprise Linux 5" channel can upgrade to this release by running up2date. Red Hat's Enterprise Linux 5

This patch adds an option to instantiate guest virtio-mmio devices basing on a kernel command line (or module) parameter, for example: virtio_mmio.devices=0x100 at 0x100b0000:48,1K at 0x1001e000:74 Signed-off-by: Pawel Moll <pawel.moll at arm.com> --- drivers/virtio/Kconfig | 25 ++++++ drivers/virtio/virtio_mmio.c | 170 +++++++++++++++++++++++++++++++++++++++++- 2 files

This patch adds an option to instantiate guest virtio-mmio devices basing on a kernel command line (or module) parameter, for example: virtio_mmio.devices=0x100 at 0x100b0000:48,1K at 0x1001e000:74 Signed-off-by: Pawel Moll <pawel.moll at arm.com> --- drivers/virtio/Kconfig | 25 ++++++ drivers/virtio/virtio_mmio.c | 170 +++++++++++++++++++++++++++++++++++++++++- 2 files

Hi, Anybody (Christian?) could please tell me if we can get the support for registering watch with /proc/xen/xenbus? (..OK, I know that we will change it this /proc stuff to a device soon) So far we can only do read/write/rm. I really miss the xen watch feature. Many thanks, Hieu _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com

Add the NVreg_RegistryDwords command line parameter, which allows specifying additional registry keys to be sent to GSP-RM. This allows additional configuration, debugging, and experimentation with GSP-RM, which uses these keys to alter its behavior. Note that these keys are passed as-is to GSP-RM, and Nouveau does not parse them. This is in contrast to the Nvidia driver, which may parse some

Three kind of structures need to be freed on close: * All struct btrfs_device managed by fs_devices * The name field for each struct btrfs_device * The above items for seed_devices Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com> --- volumes.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/volumes.c b/volumes.c index

The following series improves kexec in a Xen PVonHVM guest. It is available via git: git://github.com/olafhering/linux.git xen-kexec-XS_RESET_WATCHES-3.0 A new xenstored command XS_RESET_WATCHES has been added in xen-unstable.hg changeset 23839:42a45baf037d. The command removes all watches and transactions for the guest. The following patches make use of the new command to wipe all existing