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2009-11-03xenbus: do not hold transaction_mutex when returning to userspaceIan Campbell1-10/+47
================================================ [ BUG: lock held when returning to user space! ] ------------------------------------------------ xenstore-list/3522 is leaving the kernel with locks still held! 1 lock held by xenstore-list/3522: #0: (&xs_state.transaction_mutex){......}, at: [<c026dc6f>] xenbus_dev_request_and_reply+0x8f/0xa0 The canonical fix for this type of issue appears to be to maintain a count manually rather than using an rwsem so do that here. Signed-off-by: Ian Campbell <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]>
2009-03-30xen/xenbus: export xenbus_dev_changedJeremy Fitzhardinge1-0/+1
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
2009-03-30xen: use device model for suspending xenbus devicesIan Campbell2-28/+11
Signed-off-by: Ian Campbell <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]>
2009-03-30xen: remove suspend_cancel hookIan Campbell1-23/+0
Remove suspend_cancel hook from xenbus_driver, in preparation for using the device model for suspending. Signed-off-by: Ian Campbell <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]>
2009-01-08xen: add xenfs to allow usermode <-> Xen interactionAlex Zeffertt2-6/+23
The xenfs filesystem exports various interfaces to usermode. Initially this exports a file to allow usermode to interact with xenbus/xenstore. Traditionally this appeared in /proc/xen. Rather than extending procfs, this patch adds a backward-compat mountpoint on /proc/xen, and provides a xenfs filesystem which can be mounted there. Signed-off-by: Alex Zeffertt <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]> Cc: Ingo Molnar <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2009-01-08drivers/xen/xenbus/xenbus_client.c: cleanup kerneldocQinghuang Feng1-2/+1
no argument named @xbt in xenbus_switch_state(), remove it. Signed-off-by: Qinghuang Feng <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2009-01-06xen: struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers2-13/+18
CC: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Kay Sievers <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2008-08-20xen: clean up domain mode predicatesJeremy Fitzhardinge1-4/+4
There are four operating modes Xen code may find itself running in: - native - hvm domain - pv dom0 - pv domU Clean up predicates for testing for these states to make them more consistent. Signed-off-by: Jeremy Fitzhardinge <[email protected]> Cc: Xen-devel <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
2008-07-14Merge branch 'x86/for-linus' of ↵Linus Torvalds1-11/+12
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (821 commits) x86: make 64bit hpet_set_mapping to use ioremap too, v2 x86: get x86_phys_bits early x86: max_low_pfn_mapped fix #4 x86: change _node_to_cpumask_ptr to return const ptr x86: I/O APIC: remove an IRQ2-mask hack x86: fix numaq_tsc_disable calling x86, e820: remove end_user_pfn x86: max_low_pfn_mapped fix, #3 x86: max_low_pfn_mapped fix, #2 x86: max_low_pfn_mapped fix, #1 x86_64: fix delayed signals x86: remove conflicting nx6325 and nx6125 quirks x86: Recover timer_ack lost in the merge of the NMI watchdog x86: I/O APIC: Never configure IRQ2 x86: L-APIC: Always fully configure IRQ0 x86: L-APIC: Set IRQ0 as edge-triggered x86: merge dwarf2 headers x86: use AS_CFI instead of UNWIND_INFO x86: use ignore macro instead of hash comment x86: use matching CFI_ENDPROC ...
2008-07-03xen: Avoid allocations causing swap activity on the resume pathIan Campbell2-6/+6
Avoid allocations causing swap activity on the resume path by preventing the allocations from doing IO and allowing them to access the emergency pools. These paths are used when a frontend device is trying to connect to its backend driver over Xenbus. These reconnections are triggered on demand by IO, so by definition there is already IO underway, and further IO would naturally deadlock. On resume, this path is triggered when the running system tries to continue using its devices. If it cannot then the resume will fail; to try to avoid this we let it dip into the emergency pools. [ linux-2.6.18-xen changesets e8b49cfbdac, fdb998e79aba ] Signed-off-by: Ian Campbell <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2008-05-27xenbus: rebind irq on restoreJeremy Fitzhardinge1-11/+12
When restoring, rebind the existing xenbus irq to the new xenbus event channel. (It turns out in practice that this is always the same, and is never updated on restore. That's a bug, but Xeno-linux has been like this for a long time, so it can't really be fixed.) Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
2008-04-24xen: Module autoprobing support for frontend driversMark McLoughlin1-2/+25
Add module aliases to support autoprobing modules for xen frontend devices. Signed-off-by: Mark McLoughlin <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
2008-04-24xen blkfront: Delay wait for block devices until after the disk is addedChristian Limpach1-1/+4
When the xen block frontend driver is built as a module the module load is only synchronous up to the point where the frontend and the backend become connected rather than when the disk is added. This means that there can be a race on boot between loading the module and loading the dm-* modules and doing the scan for LVM physical volumes (all in the initrd). In the failure case the disk is not present until after the scan for physical volumes is complete. Taken from: http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/11483a00c017 Signed-off-by: Christian Limpach <[email protected]> Signed-off-by: Mark McLoughlin <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
2008-04-24xen: replace callers of alloc_vm_area()/free_vm_area() with xen_ prefixed oneIsaku Yamahata1-3/+3
Don't use alloc_vm_area()/free_vm_area() directly, instead define xen_alloc_vm_area()/xen_free_vm_area() and use them. alloc_vm_area()/free_vm_area() are used to allocate/free area which are for grant table mapping. Xen/x86 grant table is based on virtual address so that alloc_vm_area()/free_vm_area() are suitable. On the other hand Xen/ia64 (and Xen/powerpc) grant table is based on pseudo physical address (guest physical address) so that allocation should be done differently. The original version of xenified Linux/IA64 have its own allocate_vm_area()/free_vm_area() definitions which don't allocate vm area contradictory to those names. Now vanilla Linux already has its definitions so that it's impossible to have IA64 definitions of allocate_vm_area()/free_vm_area(). Instead introduce xen_allocate_vm_area()/xen_free_vm_area() and use them. Signed-off-by: Isaku Yamahata <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
2007-10-18Add missing newlines to some uses of dev_<level> messagesJoe Perches1-2/+3
Found these while looking at printk uses. Add missing newlines to dev_<level> uses Add missing KERN_<level> prefixes to multiline dev_<level>s Fixed a wierd->weird spelling typo Added a newline to a printk Signed-off-by: Joe Perches <[email protected]> Cc: "Luck, Tony" <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Mark M. Hoffman <[email protected]> Cc: Roland Dreier <[email protected]> Cc: Tilman Schmidt <[email protected]> Cc: David Woodhouse <[email protected]> Cc: Jeff Garzik <[email protected]> Cc: Stephen Hemminger <[email protected]> Cc: Greg KH <[email protected]> Cc: Jeremy Fitzhardinge <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Alessandro Zummo <[email protected]> Cc: David Brownell <[email protected]> Cc: James Smart <[email protected]> Cc: Andrew Vasquez <[email protected]> Cc: "Antonino A. Daplas" <[email protected]> Cc: Evgeniy Polyakov <[email protected]> Cc: Russell King <[email protected]> Cc: Jaroslav Kysela <[email protected]> Cc: Takashi Iwai <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2007-07-26xenbus_xs.c: fix a use-after-freeAdrian Bunk1-1/+1
This patch fixes an obvious use-after-free spotted by the Coverity checker. Signed-off-by: Adrian Bunk <[email protected]> Acked-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2007-07-18xen: add the Xenbus sysfs and virtual device hotplug driverJeremy Fitzhardinge7-0/+2725
This communicates with the machine control software via a registry residing in a controlling virtual machine. This allows dynamic creation, destruction and modification of virtual device configurations (network devices, block devices and CPUS, to name some examples). [ Greg, would you mind giving this a review? Thanks -J ] Signed-off-by: Ian Pratt <[email protected]> Signed-off-by: Christian Limpach <[email protected]> Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Chris Wright <[email protected]> Cc: Greg KH <[email protected]>
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