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2012-01-27xen/granttable: Disable grant v2 for HVM domains.Konrad Rzeszutek Wilk
As proper scaffolding for supporting error status is not yet implemented. BUG: unable to handle kernel NULL pointer dereference at 0000000000000400 IP: [<ffffffff81375ae9>] gnttab_end_foreign_access_ref_v2+0x29/0x40 PGD 32aa3067 PUD 32a87067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU 0 Modules linked in: sg sr_mod cdrom ata_generic ata_piix libata scsi_mod xen_blkfront xen_netfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront cmd Pid: 2307, comm: ip Not tainted 3.3.0-rc1 #1 Xen HVM domU RIP: 0010:[<ffffffff81375ae9>] [<ffffffff81375ae9>] gnttab_end_foreign_access_ref_v2+0x29/0x40 RSP: 0018:ffff88003be03d38 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff880033210640 RCX: 0000000000000040 RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000200 RBP: ffff88003be03d38 R08: 0000000000000101 R09: 0000000000000000 R10: dead000000100100 R11: 0000000000000000 R12: ffff88003be03e48 R13: 0000000000000001 R14: ffff880039461c00 R15: 0000000000000200 FS: 00007fb1f84ec700(0000) GS:ffff88003be00000(0000) knlGS:0000000000000000 ... Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-18xen: using EXPORT_SYMBOL requires including export.hStephen Rothwell
Fix these warnings: drivers/xen/biomerge.c:14:1: warning: data definition has no type or storage class [enabled by default] drivers/xen/biomerge.c:14:1: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' [-Wimplicit-int] drivers/xen/biomerge.c:14:1: warning: parameter names (without types) in function declaration [enabled by default] And this build error: ERROR: "xen_biovec_phys_mergeable" [drivers/block/nvme.ko] undefined! Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-18Merge git://git.infradead.org/users/willy/linux-nvmeLinus Torvalds
* git://git.infradead.org/users/willy/linux-nvme: (105 commits) NVMe: Set number of queues correctly NVMe: Version 0.8 NVMe: Set queue flags correctly NVMe: Simplify nvme_unmap_user_pages NVMe: Mark the end of the sg list NVMe: Fix DMA mapping for admin commands NVMe: Rename IO_TIMEOUT to NVME_IO_TIMEOUT NVMe: Merge the nvme_bio and nvme_prp data structures NVMe: Change nvme_completion_fn to take a dev NVMe: Change get_nvmeq to take a dev instead of a namespace NVMe: Simplify completion handling NVMe: Update Identify Controller data structure NVMe: Implement doorbell stride capability NVMe: Version 0.7 NVMe: Don't probe namespace 0 Fix calculation of number of pages in a PRP List NVMe: Create nvme_identify and nvme_get_features functions NVMe: Fix memory leak in nvme_dev_add() NVMe: Fix calls to dma_unmap_sg NVMe: Correct sg list setup in nvme_map_user_pages ...
2012-01-17Merge branch 'stable/for-linus-fixes-3.3' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen * 'stable/for-linus-fixes-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/balloon: Move the registration from device to subsystem.
2012-01-13module_param: make bool parameters really bool (drivers & misc)Rusty Russell
module_param(bool) used to counter-intuitively take an int. In fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy trick. It's time to remove the int/unsigned int option. For this version it'll simply give a warning, but it'll break next kernel version. Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-01-12xen/balloon: Move the registration from device to subsystem.Konrad Rzeszutek Wilk
With git commit 070680218379e15c1901f4bf21b98e3cbf12b527 "xen-balloon: convert sysdev_class to a regular subsystem" we would end up with the attributes being put in: /sys/devices/xen_memory0/target_kb instead of /sys/devices/system/xen_memory/xen_memory0/target_kb Making the tools inable to deflate the kernel to make more space for launching another guest and printing: Error: Failed to query current memory allocation of dom0 Reported-by: Sander Eikelenboom <linux@eikelenboom.it> Suggested-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-12Merge commit '070680218379e15c1901f4bf21b98e3cbf12b527' into ↵Konrad Rzeszutek Wilk
stable/for-linus-fixes-3.3 * commit '070680218379e15c1901f4bf21b98e3cbf12b527': (50 commits) xen-balloon: convert sysdev_class to a regular subsystem clocksource: convert sysdev_class to a regular subsystem ibm_rtl: convert sysdev_class to a regular subsystem edac: convert sysdev_class to a regular subsystem rtmutex-tester: convert sysdev_class to a regular subsystem driver-core: implement 'sysdev' functionality for regular devices and buses kref: fix up the kfree build problems kref: Remove the memory barriers kref: Implement kref_put in terms of kref_sub kref: Inline all functions Drivers: hv: Get rid of an unnecessary check in hv.c Drivers: hv: Make the vmbus driver unloadable Drivers: hv: Fix a memory leak Documentation: Update stable address MAINTAINERS: stable: Update address w1: add fast search for single slave bus driver-core: skip uevent generation when nobody is listening drivers: hv: Don't OOPS when you cannot init vmbus firmware: google: fix gsmi.c build warning drivers_base: make argument to platform_device_register_full const ...
2012-01-10Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linuxLinus Torvalds
* 'drm-core-next' of git://people.freedesktop.org/~airlied/linux: (307 commits) drm/nouveau/pm: fix build with HWMON off gma500: silence gcc warnings in mid_get_vbt_data() drm/ttm: fix condition (and vs or) drm/radeon: double lock typo in radeon_vm_bo_rmv() drm/radeon: use after free in radeon_vm_bo_add() drm/sis|via: don't return stack garbage from free_mem ioctl drm/radeon/kms: remove pointless CS flags priority struct drm/radeon/kms: check if vm is supported in VA ioctl drm: introduce drm_can_sleep and use in intel/radeon drivers. (v2) radeon: Fix disabling PCI bus mastering on big endian hosts. ttm: fix agp since ttm tt rework agp: Fix multi-line warning message whitespace drm/ttm/dma: Fix accounting error when calling ttm_mem_global_free_page and don't try to free freed pages. drm/ttm/dma: Only call set_pages_array_wb when the page is not in WB pool. drm/radeon/kms: sync across multiple rings when doing bo moves v3 drm/radeon/kms: Add support for multi-ring sync in CS ioctl (v2) drm/radeon: GPU virtual memory support v22 drm: make DRM_UNLOCKED ioctls with their own mutex drm: no need to hold global mutex for static data drm/radeon/benchmark: common modes sweep ignores 640x480@32 ... Fix up trivial conflicts in radeon/evergreen.c and vmwgfx/vmwgfx_kms.c
2012-01-10Merge branch 'stable/for-linus-3.3' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen * 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: (37 commits) xen/pciback: Expand the warning message to include domain id. xen/pciback: Fix "device has been assigned to X domain!" warning xen/pciback: Move the PCI_DEV_FLAGS_ASSIGNED ops to the "[un|]bind" xen/xenbus: don't reimplement kvasprintf via a fixed size buffer xenbus: maximum buffer size is XENSTORE_PAYLOAD_MAX xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX. Xen: consolidate and simplify struct xenbus_driver instantiation xen-gntalloc: introduce missing kfree xen/xenbus: Fix compile error - missing header for xen_initial_domain() xen/netback: Enable netback on HVM guests xen/grant-table: Support mappings required by blkback xenbus: Use grant-table wrapper functions xenbus: Support HVM backends xen/xenbus-frontend: Fix compile error with randconfig xen/xenbus-frontend: Make error message more clear xen/privcmd: Remove unused support for arch specific privcmp mmap xen: Add xenbus_backend device xen: Add xenbus device driver xen: Add privcmd device driver xen/gntalloc: fix reference counts on multi-page mappings ...
2012-01-09xen/pciback: Expand the warning message to include domain id.Konrad Rzeszutek Wilk
When a PCI device is transferred to another domain and it is still in usage (from the internal perspective), mention which other domain is using it to aid in debugging. [v2: Truncate the verbose message per Jan Beulich suggestion] [v3: Suggestions from Ian Campbell on the wording] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Jan Beulich <jbeulich@suse.com>
2012-01-07xen/pciback: Fix "device has been assigned to X domain!" warningKonrad Rzeszutek Wilk
The full warning is: "pciback 0000:05:00.0: device has been assigned to 2 domain! Over-writting the ownership, but beware." which is correct - the previous domain that was using the device forgot to unregister the ownership. This patch fixes this by calling the unregister ownership function when the PCI device is relinquished from the guest domain. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-07xen/pciback: Move the PCI_DEV_FLAGS_ASSIGNED ops to the "[un|]bind"Konrad Rzeszutek Wilk
operation instead of doing it per guest creation/disconnection. Without this we could have potentially unloaded the vf driver from the xen pciback control even if the driver was binded to the xen-pciback. This will hold on to it until the user "unbind"s the PCI device using SysFS. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-06Merge branch 'driver-core-next' into Linux 3.2Greg Kroah-Hartman
This resolves the conflict in the arch/arm/mach-s3c64xx/s3c6400.c file, and it fixes the build error in the arch/x86/kernel/microcode_core.c file, that the merge did not catch. The microcode_core.c patch was provided by Stephen Rothwell <sfr@canb.auug.org.au> who was invaluable in the merge issues involved with the large sysdev removal process in the driver-core tree. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2012-01-04xen/xenbus: don't reimplement kvasprintf via a fixed size bufferIan Campbell
Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Haogang Chen <haogangchen@gmail.com> Acked-by: Jan Beulich <JBeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-04xenbus: maximum buffer size is XENSTORE_PAYLOAD_MAXIan Campbell
Use this now that it is defined even though it happens to be == PAGE_SIZE. The code which takes requests from userspace already validates against the size of this buffer so no further checks are required to ensure that userspace requests comply with the protocol in this respect. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Haogang Chen <haogangchen@gmail.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-04xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX.Ian Campbell
Haogang Chen found out that: There is a potential integer overflow in process_msg() that could result in cross-domain attack. body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH); When a malicious guest passes 0xffffffff in msg->hdr.len, the subsequent call to xb_read() would write to a zero-length buffer. The other end of this connection is always the xenstore backend daemon so there is no guest (malicious or otherwise) which can do this. The xenstore daemon is a trusted component in the system. However this seem like a reasonable robustness improvement so we should have it. And Ian when read the API docs found that: The payload length (len field of the header) is limited to 4096 (XENSTORE_PAYLOAD_MAX) in both directions. If a client exceeds the limit, its xenstored connection will be immediately killed by xenstored, which is usually catastrophic from the client's point of view. Clients (particularly domains, which cannot just reconnect) should avoid this. so this patch checks against that instead. This also avoids a potential integer overflow pointed out by Haogang Chen. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Haogang Chen <haogangchen@gmail.com> CC: stable@kernel.org Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-04Xen: consolidate and simplify struct xenbus_driver instantiationJan Beulich
The 'name', 'owner', and 'mod_name' members are redundant with the identically named fields in the 'driver' sub-structure. Rather than switching each instance to specify these fields explicitly, introduce a macro to simplify this. Eliminate further redundancy by allowing the drvname argument to DEFINE_XENBUS_DRIVER() to be blank (in which case the first entry from the ID table will be used for .driver.name). Also eliminate the questionable xenbus_register_{back,front}end() wrappers - their sole remaining purpose was the checking of the 'owner' field, proper setting of which shouldn't be an issue anymore when the macro gets used. v2: Restore DRV_NAME for the driver name in xen-pciback. Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-01-03xen-gntalloc: introduce missing kfreeJulia Lawall
Error handling code following a kmalloc should free the allocated data. Out_unlock is used on both success and failure, so free vm_priv before jumping to that label. A simplified version of the semantic match that finds the problem is as follows: (http://coccinelle.lip6.fr) // <smpl> @r exists@ local idexpression x; statement S; identifier f1; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } x->f1 ...> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> [v1: Altered the description a bit] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-21xen/xenbus: Fix compile error - missing header for xen_initial_domain()Konrad Rzeszutek Wilk
drivers/xen/xenbus/xenbus_dev_backend.c:74:2: error: implicit declaration of function 'xen_initial_domain' Reported-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-20xen/grant-table: Support mappings required by blkbackDaniel De Graaf
Add support for mappings without GNTMAP_contains_pte. This was not supported because the unmap operation assumed that this flag was being used; adding a parameter to the unmap operation to allow the PTE clearing to be disabled is sufficient to make unmap capable of supporting either mapping type. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> [v1: Fix cleanpatch warnings] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-20xenbus: Use grant-table wrapper functionsDaniel De Graaf
For xenbus_{map,unmap}_ring to work on HVM, the grant table operations must be set up using the gnttab_set_{map,unmap}_op functions instead of directly populating the fields of gnttab_map_grant_ref. These functions simply populate the structure on paravirtualized Xen; however, on HVM they must call __pa() on vaddr when populating op->host_addr because the hypervisor cannot directly interpret guest-virtual addresses. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> [v1: Fixed cleanpatch error] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-20xenbus: Support HVM backendsDaniel De Graaf
Add HVM implementations of xenbus_(map,unmap)_ring_v(alloc,free) so that ring mappings can be done without using GNTMAP_contains_pte which is not supported on HVM. This also removes the need to use vmlist_lock on PV by tracking the allocated xenbus rings. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> [v1: Fix compile error when XENBUS_FRONTEND is defined as module] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-20Merge commit 'v3.2-rc3' into stable/for-linus-3.3Konrad Rzeszutek Wilk
* commit 'v3.2-rc3': (412 commits) Linux 3.2-rc3 virtio-pci: make reset operation safer virtio-mmio: Correct the name of the guest features selector virtio: add HAS_IOMEM dependency to MMIO platform bus driver eCryptfs: Extend array bounds for all filename chars eCryptfs: Flush file in vma close eCryptfs: Prevent file create race condition regulator: TPS65910: Fix VDD1/2 voltage selector count i2c: Make i2cdev_notifier_call static i2c: Delete ANY_I2C_BUS i2c: Fix device name for 10-bit slave address i2c-algo-bit: Generate correct i2c address sequence for 10-bit target drm: integer overflow in drm_mode_dirtyfb_ioctl() Revert "of/irq: of_irq_find_parent: check for parent equal to child" drivers/gpu/vga/vgaarb.c: add missing kfree drm/radeon/kms/atom: unify i2c gpio table handling drm/radeon/kms: fix up gpio i2c mask bits for r4xx for real ttm: Don't return the bo reserved on error path mount_subtree() pointless use-after-free iio: fix a leak due to improper use of anon_inode_getfd() ...
2011-12-20xen/xenbus-frontend: Fix compile error with randconfigKonrad Rzeszutek Wilk
drivers/xen/xenbus/xenbus_dev_frontend.c: In function 'xenbus_init': drivers/xen/xenbus/xenbus_dev_frontend.c:609:2: error: implicit declaration of function 'xen_domain' Reported-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-20Merge tag 'v3.2-rc6' of /home/airlied/devel/kernel/linux-2.6 into drm-core-nextDave Airlie
Merge in the upstream tree to bring in the mainline fixes. Conflicts: drivers/gpu/drm/exynos/exynos_drm_fbdev.c drivers/gpu/drm/nouveau/nouveau_sgdma.c
2011-12-19Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from ↵Konrad Rzeszutek Wilk
old kernel" This reverts commit ddacf5ef684a655abe2bb50c4b2a5b72ae0d5e05. As when booting the kernel under Amazon EC2 as an HVM guest it ends up hanging during startup. Reverting this we loose the fix for kexec booting to the crash kernels. Fixes Canonical BZ #901305 (http://bugs.launchpad.net/bugs/901305) Tested-by: Alessandro Salvatori <sandr8@gmail.com> Reported-by: Stefan Bader <stefan.bader@canonical.com> Acked-by: Ian Campbell <Ian.Campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/xenbus-frontend: Make error message more clearBastian Blank
Add the work frontend to the error message because we now also have a backend device. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/privcmd: Remove unused support for arch specific privcmp mmapBastian Blank
This was used for ia64. But there is no working ia64 support in sight, so remove it for now. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen: Add xenbus_backend deviceBastian Blank
Access for xenstored to the event channel and pre-allocated ring is managed via xenfs. This adds its own character device featuring mmap for the ring and an ioctl for the event channel. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen: Add xenbus device driverBastian Blank
Access to xenbus is currently handled via xenfs. This adds a device driver for xenbus and makes xenfs use this code. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen: Add privcmd device driverBastian Blank
Access to arbitrary hypercalls is currently provided via xenfs. This adds a standard character device to handle this. The support in xenfs remains for backward compatibility and uses the device driver code. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/gntalloc: fix reference counts on multi-page mappingsDaniel De Graaf
When a multi-page mapping of gntalloc is created, the reference counts of all pages in the vma are incremented. However, the vma open/close operations only adjusted the reference count of the first page in the mapping, leaking the other pages. Store a struct in the vm_private_data to track the original page count to properly free the pages when the last reference to the vma is closed. Reported-by: Anil Madhavapeddy <anil@recoil.org> Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/gntalloc: release grant references on page freeDaniel De Graaf
gnttab_end_foreign_access_ref does not return the grant reference it is passed to the free list; gnttab_free_grant_reference needs to be explicitly called. While gnttab_end_foreign_access provides a wrapper for this, it is unsuitable because it does not return errors. Reported-by: Anil Madhavapeddy <anil@recoil.org> Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/events: prevent calling evtchn_get on invalid channelsDaniel De Graaf
The event channel number provided to evtchn_get can be provided by userspace, so needs to be checked against the maximum number of event channels prior to using it to index into evtchn_to_irq. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/granttable: Support transitive grantsAnnie Li
These allow a domain A which has been granted access on a page of domain B's memory to issue domain C with a copy-grant on the same page. This is useful e.g. for forwarding packets between domains. Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/granttable: Support sub-page grantsAnnie Li
- They can't be used to map the page (so can only be used in a GNTTABOP_copy hypercall). - It's possible to grant access with a finer granularity than whole pages. - Xen guarantees that they can be revoked quickly (a normal map grant can only be revoked with the cooperation of the domain which has been granted access). Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-16xen/granttable: Improve comments for function pointersAnnie Li
Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-15xen: fix build breakage in xen-selfballoon.c caused by sysdev conversionGreg Kroah-Hartman
This adds the needed include file for xen-selfballoon.c to fix the build error reported by Stephen Rothwell. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-12-15xen/swiotlb: Use page alignment for early buffer allocation.Konrad Rzeszutek Wilk
This fixes an odd bug found on a Dell PowerEdge 1850/0RC130 (BIOS A05 01/09/2006) where all of the modules doing pci_set_dma_mask would fail with: ata_piix 0000:00:1f.1: enabling device (0005 -> 0007) ata_piix 0000:00:1f.1: can't derive routing for PCI INT A ata_piix 0000:00:1f.1: BMDMA: failed to set dma mask, falling back to PIO The issue was the Xen-SWIOTLB was allocated such as that the end of buffer was stradling a page (and also above 4GB). The fix was spotted by Kalev Leonid which was to piggyback on git commit e79f86b2ef9c0a8c47225217c1018b7d3d90101c "swiotlb: Use page alignment for early buffer allocation" which: We could call free_bootmem_late() if swiotlb is not used, and it will shrink to page alignment. So alloc them with page alignment at first, to avoid lose two pages And doing that fixes the outstanding issue. CC: stable@kernel.org Suggested-by: "Kalev, Leonid" <Leonid.Kalev@ca.com> Reported-and-Tested-by: "Taylor, Neal E" <Neal.Taylor@ca.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-14xen-balloon: convert sysdev_class to a regular subsystemKay Sievers
After all sysdev classes are ported to regular driver core entities, the sysdev implementation will be entirely removed from the kernel. Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-12-06swiotlb: Expose swiotlb_nr_tlb function to modulesKonrad Rzeszutek Wilk
As a mechanism to detect whether SWIOTLB is enabled or not. We also fix the spelling - it was swioltb instead of swiotlb. CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> [v1: Ripped out swiotlb_enabled] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-22xen/granttable: Keep code format cleanAnnie Li
Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-22xen/granttable: Grant tables V2 implementationAnnie Li
Receiver-side copying of packets is based on this implementation, it gives better performance and better CPU accounting. It totally supports three types: full-page, sub-page and transitive grants. However this patch does not cover sub-page and transitive grants, it mainly focus on Full-page part and implements grant table V2 interfaces corresponding to what already exists in grant table V1, such as: grant table V2 initialization, mapping, releasing and exported interfaces. Each guest can only supports one type of grant table type, every entry in grant table should be the same version. It is necessary to set V1 or V2 version before initializing the grant table. Grant table exported interfaces of V2 are same with those of V1, Xen is responsible to judge what grant table version guests are using in every grant operation. V2 fulfills the same role of V1, and it is totally backwards compitable with V1. If dom0 support grant table V2, the guests runing on it can run with either V1 or V2. Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Annie Li <annie.li@oracle.com> [v1: Modified alloc_vm_area call (new parameters), indentation, and cleanpatch warnings] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-22xen/granttable: Refactor some codeAnnie Li
Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-22xen/granttable: Introducing grant table V2 stuctureAnnie Li
This patch introduces new structures of grant table V2, grant table V2 is an extension from V1. Grant table is shared between guest and Xen, and Xen is responsible to do corresponding work for grant operations, such as: figure out guest's grant table version, perform different actions based on different grant table version, etc. Although full-page structure of V2 is different from V1, it play the same role as V1. Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Annie Li <annie.li@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-21xen/event: Add reference counting to event channelsDaniel De Graaf
Event channels exposed to userspace by the evtchn module may be used by other modules in an asynchronous manner, which requires that reference counting be used to prevent the event channel from being closed before the signals are delivered. The reference count on new event channels defaults to -1 which indicates the event channel is not referenced outside the kernel; evtchn_get fails if called on such an event channel. The event channels made visible to userspace by evtchn have a normal reference count. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-21xen/gnt{dev,alloc}: reserve event channels for notifyDaniel De Graaf
When using the unmap notify ioctl, the event channel used for notification needs to be reserved to avoid it being deallocated prior to sending the notification. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-21xen/gntalloc: Change gref_lock to a mutexDaniel De Graaf
The event channel release function cannot be called under a spinlock because it can attempt to acquire a mutex due to the event channel reference acquired when setting up unmap notifications. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-16xen-gntalloc: signedness bug in add_grefs()Dan Carpenter
gref->gref_id is unsigned so the error handling didn't work. gnttab_grant_foreign_access() returns an int type, so we can add a cast here, and it doesn't cause any problems. gnttab_grant_foreign_access() can return a variety of errors including -ENOSPC, -ENOSYS and -ENOMEM. CC: stable@kernel.org Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-11-16xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()Dan Carpenter
On 32 bit systems a high value of op.count could lead to an integer overflow in the kzalloc() and gref_ids would be smaller than expected. If the you triggered another integer overflow in "if (gref_size + op.count > limit)" then you'd probably get memory corruption inside add_grefs(). CC: stable@kernel.org Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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