- 15 10月, 2014 5 次提交
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由 Michael S. Tsirkin 提交于
virtio spec requires drivers to set DRIVER_OK before using VQs. This is set automatically after resume returns, virtio balloon violated this rule by adding bufs, which causes the VQ to be used directly within restore. To fix, call virtio_device_ready before using VQ. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Michael S. Tsirkin 提交于
Defer config changed notifications that arrive during probe/scan/freeze/restore. This will allow drivers to set DRIVER_OK earlier, without worrying about racing with config change interrupts. This change will also benefit old hypervisors (before 2009) that send interrupts without checking DRIVER_OK: previously, the callback could race with driver-specific initialization. This will also help simplify drivers. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cosmetic changes)
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由 Michael S. Tsirkin 提交于
This is in preparation to extending config changed event handling in core. Wrapping these in an API also seems to make for a cleaner code. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Michael S. Tsirkin 提交于
Replace duplicated code in all transports with a single wrapper in virtio.c. The only functional change is in virtio_mmio.c: if a buggy device sends us an interrupt before driver is set, we previously returned IRQ_NONE, now we return IRQ_HANDLED. As this must not happen in practice, this does not look like a big deal. See also commit 3fff0179 virtio-pci: do not oops on config change if driver not loaded. for the original motivation behind the driver check. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Michael S. Tsirkin 提交于
On restore, virtio pci does the following: + set features + init vqs etc - device can be used at this point! + set ACKNOWLEDGE,DRIVER and DRIVER_OK status bits This is in violation of the virtio spec, which requires the following order: - ACKNOWLEDGE - DRIVER - init vqs - DRIVER_OK This behaviour will break with hypervisors that assume spec compliant behaviour. It seems like a good idea to have this patch applied to stable branches to reduce the support butden for the hypervisors. Cc: stable@vger.kernel.org Cc: Amit Shah <amit.shah@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 10 10月, 2014 3 次提交
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由 Konstantin Khlebnikov 提交于
Always mark pages with PageBalloon even if balloon compaction is disabled and expose this mark in /proc/kpageflags as KPF_BALLOON. Also this patch adds three counters into /proc/vmstat: "balloon_inflate", "balloon_deflate" and "balloon_migrate". They accumulate balloon activity. Current size of balloon is (balloon_inflate - balloon_deflate) pages. All generic balloon code now gathered under option CONFIG_MEMORY_BALLOON. It should be selected by ballooning driver which wants use this feature. Currently virtio-balloon is the only user. Signed-off-by: NKonstantin Khlebnikov <k.khlebnikov@samsung.com> Cc: Rafael Aquini <aquini@redhat.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Konstantin Khlebnikov 提交于
Now ballooned pages are detected using PageBalloon(). Fake mapping is no longer required. This patch links ballooned pages to balloon device using field page->private instead of page->mapping. Also this patch embeds balloon_dev_info directly into struct virtio_balloon. Signed-off-by: NKonstantin Khlebnikov <k.khlebnikov@samsung.com> Cc: Rafael Aquini <aquini@redhat.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Konstantin Khlebnikov 提交于
Sasha Levin reported KASAN splash inside isolate_migratepages_range(). Problem is in the function __is_movable_balloon_page() which tests AS_BALLOON_MAP in page->mapping->flags. This function has no protection against anonymous pages. As result it tried to check address space flags inside struct anon_vma. Further investigation shows more problems in current implementation: * Special branch in __unmap_and_move() never works: balloon_page_movable() checks page flags and page_count. In __unmap_and_move() page is locked, reference counter is elevated, thus balloon_page_movable() always fails. As a result execution goes to the normal migration path. virtballoon_migratepage() returns MIGRATEPAGE_BALLOON_SUCCESS instead of MIGRATEPAGE_SUCCESS, move_to_new_page() thinks this is an error code and assigns newpage->mapping to NULL. Newly migrated page lose connectivity with balloon an all ability for further migration. * lru_lock erroneously required in isolate_migratepages_range() for isolation ballooned page. This function releases lru_lock periodically, this makes migration mostly impossible for some pages. * balloon_page_dequeue have a tight race with balloon_page_isolate: balloon_page_isolate could be executed in parallel with dequeue between picking page from list and locking page_lock. Race is rare because they use trylock_page() for locking. This patch fixes all of them. Instead of fake mapping with special flag this patch uses special state of page->_mapcount: PAGE_BALLOON_MAPCOUNT_VALUE = -256. Buddy allocator uses PAGE_BUDDY_MAPCOUNT_VALUE = -128 for similar purpose. Storing mark directly in struct page makes everything safer and easier. PagePrivate is used to mark pages present in page list (i.e. not isolated, like PageLRU for normal pages). It replaces special rules for reference counter and makes balloon migration similar to migration of normal pages. This flag is protected by page_lock together with link to the balloon device. Signed-off-by: NKonstantin Khlebnikov <k.khlebnikov@samsung.com> Reported-by: NSasha Levin <sasha.levin@oracle.com> Link: http://lkml.kernel.org/p/53E6CEAA.9020105@oracle.com Cc: Rafael Aquini <aquini@redhat.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: <stable@vger.kernel.org> [3.8+] Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 9月, 2014 2 次提交
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由 Rusty Russell 提交于
virtqueue_add() populates the virtqueue descriptor table from the sgs given. If it uses an indirect descriptor table, then it puts a single descriptor in the descriptor table pointing to the kmalloc'ed indirect table where the sg is populated. Previously vring_add_indirect() did the allocation and the simple linear layout. We replace that with alloc_indirect() which allocates the indirect table then chains it like the normal descriptor table so we can reuse the core logic. This slows down pktgen by less than 1/2 a percent (which uses direct descriptors), as well as vring_bench, but it's far neater. vring_bench before: 1061485790-1104800648(1.08254e+09+/-6.6e+06)ns vring_bench after: 1125610268-1183528965(1.14172e+09+/-8e+06)ns pktgen before: 787781-796334(793165+/-2.4e+03)pps 365-369(367.5+/-1.2)Mb/sec (365530384-369498976(3.68028e+08+/-1.1e+06)bps) errors: 0 pktgen after: 779988-790404(786391+/-2.5e+03)pps 361-366(364.35+/-1.3)Mb/sec (361914432-366747456(3.64885e+08+/-1.2e+06)bps) errors: 0 Now, if we make force indirect descriptors by turning off any_header_sg in virtio_net.c: pktgen before: 713773-721062(718374+/-2.1e+03)pps 331-334(332.95+/-0.92)Mb/sec (331190672-334572768(3.33325e+08+/-9.6e+05)bps) errors: 0 pktgen after: 710542-719195(714898+/-2.4e+03)pps 329-333(331.15+/-1.1)Mb/sec (329691488-333706480(3.31713e+08+/-1.1e+06)bps) errors: 0 Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Rusty Russell 提交于
We used to have several callers which just used arrays. They're gone, so we can use sg_next() everywhere, simplifying the code. On my laptop, this slowed down vring_bench by 15%: vring_bench before: 936153354-967745359(9.44739e+08+/-6.1e+06)ns vring_bench after: 1061485790-1104800648(1.08254e+09+/-6.6e+06)ns However, a more realistic test using pktgen on a AMD FX(tm)-8320 saw a few percent improvement: pktgen before: 767390-792966(785159+/-6.5e+03)pps 356-367(363.75+/-2.9)Mb/sec (356068960-367936224(3.64314e+08+/-3e+06)bps) errors: 0 pktgen after: 787781-796334(793165+/-2.4e+03)pps 365-369(367.5+/-1.2)Mb/sec (365530384-369498976(3.68028e+08+/-1.1e+06)bps) errors: 0 Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 27 7月, 2014 1 次提交
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由 Benoit Taine 提交于
We should prefer `struct pci_device_id` over `DEFINE_PCI_DEVICE_TABLE` to meet kernel coding style guidelines. This issue was reported by checkpatch. Signed-off-by: NBenoit Taine <benoit.taine@lip6.fr> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 28 4月, 2014 1 次提交
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由 Rusty Russell 提交于
Good for post-apocalyptic scenarios, like S/390 hotplug. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 13 3月, 2014 5 次提交
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由 Rusty Russell 提交于
Heinz points out that adding buffers to a broken virtqueue (which should "never happen") still works. Failing allows drivers to detect and complain about broken devices. Now drivers are robust, we can add this extra check. Reported-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
A bad implementation of virtio might cause us to mark the virtqueue broken: we'll dev_err() in that case, and the device is useless, but let's not BUG(). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
When adding or removing 100G from a balloon: BUG: soft lockup - CPU#0 stuck for 22s! [vballoon:367] We have a wait_event_interruptible(), but the condition is always true (more ballooning to do) so we don't ever sleep. We also have a wait_event() for the host to ack, but that is also always true as QEMU is synchronous for balloon operations. Reported-by: NGopesh Kumar Chaudhary <gopchaud@in.ibm.com> Cc: stable@kernel.org Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Alexander Gordeev 提交于
As result of deprecation of MSI-X/MSI enablement functions pci_enable_msix() and pci_enable_msi_block() all drivers using these two interfaces need to be updated to use the new pci_enable_msi_range() or pci_enable_msi_exact() and pci_enable_msix_range() or pci_enable_msix_exact() interfaces. Signed-off-by: NAlexander Gordeev <agordeev@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Joel Stanley 提交于
In commit bb478d8b virtio_ring: plug kmemleak false positive, kmemleak_ignore was introduced. This broke compilation of virtio_test: cc -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -c -o virtio_ring.o ../../drivers/virtio/virtio_ring.c ../../drivers/virtio/virtio_ring.c: In function ‘vring_add_indirect’: ../../drivers/virtio/virtio_ring.c:177:2: warning: implicit declaration of function ‘kmemleak_ignore’ [-Wimplicit-function-declaration] kmemleak_ignore(desc); ^ cc virtio_test.o virtio_ring.o -o virtio_test virtio_ring.o: In function `vring_add_indirect': tools/virtio/../../drivers/virtio/virtio_ring.c:177: undefined reference to `kmemleak_ignore' Add a dummy header for tools/virtio, and add #incldue <linux/kmemleak.h> to drivers/virtio/virtio_ring.c so it is picked up by the userspace tools. Signed-off-by: NJoel Stanley <joel@jms.id.au> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 16 1月, 2014 1 次提交
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由 Rashika Kheria 提交于
Mark the function virtballoon_migratepage() as static in virtio_balloon.c because it is not used outside this file. This eliminates the following warning in virtio_balloon.c: drivers/virtio/virtio_balloon.c:372:5: warning: no previous prototype for ‘virtballoon_migratepage’ [-Wmissing-prototypes] Signed-off-by: NRashika Kheria <rashika.kheria@gmail.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 05 12月, 2013 1 次提交
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由 Luiz Capitulino 提交于
According to the virtio spec, the device configuration field that should be updated after an inflation or deflation operation is the 'actual' field, not the 'num_pages' one. Commit 855e0c52 swapped them in update_balloon_size(). Fix it. Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Fixes: 855e0c52
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- 04 12月, 2013 1 次提交
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由 Jingoo Han 提交于
The driver core clears the driver data to NULL after device_release or on probe failure. Thus, it is not needed to manually clear the device driver data to NULL. Signed-off-by: NJingoo Han <jg1.han@samsung.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 07 11月, 2013 1 次提交
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由 Marc Zyngier 提交于
As virtio-mmio config registers are specified to be little-endian, using readl() to read the magic value and then memcmp() to check it fails on BE (as readl() has an implicit swab). Fix it by encoding the magic value as an integer instead of a string. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Acked-by: NPawel Moll <pawel.moll@arm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 05 11月, 2013 1 次提交
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由 Heinz Graalfs 提交于
Correct if statement to check for bool returned by notify() (introduced in 5b1bf7cb). Signed-off-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 29 10月, 2013 3 次提交
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由 Heinz Graalfs 提交于
Add new function virtqueue_is_broken(). Callers of virtqueue_get_buf() should check for a broken queue. Signed-off-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Heinz Graalfs 提交于
virtqueue_{kick()/notify()} should exploit the new host notification API. If the notify call returned with a negative value the host kick failed (e.g. a kick triggered after a device was hot-unplugged). In this case the virtqueue is set to 'broken' and false is returned, otherwise true. Signed-off-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Heinz Graalfs 提交于
Currently a host kick error is silently ignored and not reflected in the virtqueue of a particular virtio device. Changing the notify API for guest->host notification seems to be one prerequisite in order to be able to handle such errors in the context where the kick is triggered. This patch changes the notify API. The notify function must return a bool return value. It returns false if the host notification failed. Signed-off-by: NHeinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 17 10月, 2013 3 次提交
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由 Greg Kroah-Hartman 提交于
The dev_attrs field of struct bus_type is going away soon, dev_groups should be used instead. This converts the virtio bus code to use the correct field. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: <virtualization@lists.linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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由 Rusty Russell 提交于
This lets the transport do endian conversion if necessary, and insulates the drivers from the difference. Most drivers can use the simple helpers virtio_cread() and virtio_cwrite(). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
unreferenced object 0xffff88003d467e20 (size 32): comm "softirq", pid 0, jiffies 4295197765 (age 6.364s) hex dump (first 32 bytes): 28 19 bf 3d 00 00 00 00 0c 00 00 00 01 00 01 00 (..=............ 02 dc 51 3c 00 00 00 00 56 00 00 00 00 00 00 00 ..Q<....V....... backtrace: [<ffffffff8152db19>] kmemleak_alloc+0x59/0xc0 [<ffffffff81102e93>] __kmalloc+0xf3/0x180 [<ffffffff812db5d6>] vring_add_indirect+0x36/0x280 [<ffffffff812dc59f>] virtqueue_add_outbuf+0xbf/0x4e0 [<ffffffff813a8b30>] start_xmit+0x1a0/0x3b0 [<ffffffff81445861>] dev_hard_start_xmit+0x2d1/0x4d0 [<ffffffff81460052>] sch_direct_xmit+0xf2/0x1c0 [<ffffffff81445c28>] dev_queue_xmit+0x1c8/0x460 [<ffffffff814e3187>] ip6_finish_output2+0x1d7/0x470 [<ffffffff814e34b0>] ip6_finish_output+0x90/0xb0 [<ffffffff814e3507>] ip6_output+0x37/0xb0 [<ffffffff815021eb>] igmp6_send+0x2db/0x470 [<ffffffff81502645>] igmp6_timer_handler+0x95/0xa0 [<ffffffff8104b57c>] call_timer_fn+0x2c/0x90 [<ffffffff8104b7ba>] run_timer_softirq+0x1da/0x1f0 [<ffffffff81045721>] __do_softirq+0xd1/0x1b0 Address gets embedded in a descriptor via virt_to_phys(). See detach_buf, which frees it: if (vq->vring.desc[i].flags & VRING_DESC_F_INDIRECT) kfree(phys_to_virt(vq->vring.desc[i].addr)); Reported-by: NChristoph Paasch <christoph.paasch@uclouvain.be> Fix-suggested-by: NChristoph Paasch <christoph.paasch@uclouvain.be> Typing-done-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 23 9月, 2013 1 次提交
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由 Aaron Lu 提交于
The freeze and restore functions defined in virtio drivers are used for suspend and hibernate, so CONFIG_PM_SLEEP is more appropriate than CONFIG_PM. This patch replace all CONFIG_PM with CONFIG_PM_SLEEP for virtio drivers that implement freeze and restore callbacks. Signed-off-by: NAaron Lu <aaron.lu@intel.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 09 9月, 2013 1 次提交
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由 Aaron Lu 提交于
The virtio_pci_freeze/restore are defined under CONFIG_PM but is used by SET_SYSTEM_SLEEP_PM_OPS macro, which is defined under CONFIG_PM_SLEEP. So if CONFIG_PM_SLEEP is not cofigured but CONFIG_PM_RUNTIME is, the following warning message appeared: drivers/virtio/virtio_pci.c:770:12: warning: ‘virtio_pci_freeze’ defined but not used [-Wunused-function] static int virtio_pci_freeze(struct device *dev) ^ drivers/virtio/virtio_pci.c:790:12: warning: ‘virtio_pci_restore’ defined but not used [-Wunused-function] static int virtio_pci_restore(struct device *dev) ^ Fix it by changing CONFIG_PM to CONFIG_PM_SLEEP. Signed-off-by: NAaron Lu <aaron.lu@intel.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 10 7月, 2013 1 次提交
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由 Michael S. Tsirkin 提交于
This adds a way to check ring empty state after enable_cb outside any locks. Will be used by virtio_net. Note: there's room for more optimization: caller is likely to have a memory barrier already, which means we might be able to get rid of a barrier here. Deferring this optimization until we do some benchmarking. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 04 7月, 2013 1 次提交
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由 Jiang Liu 提交于
Enhance adjust_managed_page_count() to adjust totalhigh_pages for highmem pages. And change code which directly adjusts totalram_pages to use adjust_managed_page_count() because it adjusts totalram_pages, totalhigh_pages and zone->managed_pages altogether in a safe way. Remove inc_totalhigh_pages() and dec_totalhigh_pages() from xen/balloon driver bacause adjust_managed_page_count() has already adjusted totalhigh_pages. This patch also fixes two bugs: 1) enhances virtio_balloon driver to adjust totalhigh_pages when reserve/unreserve pages. 2) enhance memory_hotplug.c to adjust totalhigh_pages when hot-removing memory. We still need to deal with modifications of totalram_pages in file arch/powerpc/platforms/pseries/cmm.c, but need help from PPC experts. [akpm@linux-foundation.org: remove ifdef, per Wanpeng Li, virtio_balloon.c cleanup, per Sergei] [akpm@linux-foundation.org: export adjust_managed_page_count() to modules, for drivers/virtio/virtio_balloon.c] Signed-off-by: NJiang Liu <jiang.liu@huawei.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Minchan Kim <minchan@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <sworddragon2@aol.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Howells <dhowells@redhat.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Michel Lespinasse <walken@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 02 7月, 2013 2 次提交
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由 Luiz Capitulino 提交于
balloon_page_dequeue() can return NULL. If it does for the first page being freed then leak_balloon() will create a scatter list with len=0. Which in turn seems to generate an invalid virtio request. I didn't get this in practice, I found it by code review. On the other hand, such an invalid virtio request will cause errors in QEMU and fill_balloon() also performs the same check implemented by this commit. This bug was introduced in e2250429. Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Acked-by: NRafael Aquini <aquini@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org # 3.9
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由 Andrew Vagin 提交于
vp_dev->msix_vectors should be initialized before allocating msix_affinity_masks, otherwise vp_free_vectors will not free these objects. unreferenced object 0xffff88010f969d88 (size 512): comm "systemd-udevd", pid 158, jiffies 4294673645 (age 80.545s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff816e455e>] kmemleak_alloc+0x5e/0xc0 [<ffffffff811aa7f1>] kmem_cache_alloc_node_trace+0x141/0x2c0 [<ffffffff8133ba23>] alloc_cpumask_var_node+0x23/0x80 [<ffffffff8133ba8e>] alloc_cpumask_var+0xe/0x10 [<ffffffff813fdb3d>] vp_try_to_find_vqs+0x25d/0x810 [<ffffffff813fe171>] vp_find_vqs+0x81/0xb0 [<ffffffffa00d2a05>] init_vqs+0x85/0x120 [virtio_balloon] [<ffffffffa00d2c29>] virtballoon_probe+0xf9/0x1a0 [virtio_balloon] [<ffffffff813fb61e>] virtio_dev_probe+0xde/0x140 [<ffffffff814452b8>] driver_probe_device+0x98/0x3a0 [<ffffffff8144566b>] __driver_attach+0xab/0xb0 [<ffffffff814432f4>] bus_for_each_dev+0x94/0xb0 [<ffffffff81444f4e>] driver_attach+0x1e/0x20 [<ffffffff81444910>] bus_add_driver+0x200/0x280 [<ffffffff81445c14>] driver_register+0x74/0x160 [<ffffffff813fb7d0>] register_virtio_driver+0x20/0x40 v2: change msix_vectors uncoditionaly in vp_free_vectors Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: NAndrew Vagin <avagin@openvz.org> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 20 5月, 2013 1 次提交
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由 Rusty Russell 提交于
All users changed to virtqueue_add_sg() or virtqueue_add_outbuf/inbuf. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 20 3月, 2013 4 次提交
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由 Rusty Russell 提交于
We never add buffers with input and output parts, so use the new accessors. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
These are specialized versions of virtqueue_add_buf(), which cover over 80% of cases and are far clearer. In particular, the scatterlists passed to these functions don't have to be clean (ie. we ignore end markers). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
virtio_scsi can really use this, to avoid the current hack of copying the whole sg array. Some other things get slightly neater, too. This causes a slowdown in virtqueue_add_buf(), which is implemented as a wrapper. This is addressed in the next patches. for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers: Before: Using CPUS 0 and 3 Guest: notified 0, pinged 39009-39063(39062) Host: notified 39009-39063(39062), pinged 0 Wall time:1.700000-1.950000(1.723542) After: Using CPUS 0 and 3 Guest: notified 0, pinged 39062-39063(39063) Host: notified 39062-39063(39063), pinged 0 Wall time:1.760000-2.220000(1.789167) Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Reviewed-by: NWanlong Gao <gaowanlong@cn.fujitsu.com> Reviewed-by: NAsias He <asias@redhat.com>
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由 Rusty Russell 提交于
The host side of ring needs this logic too. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 13 2月, 2013 1 次提交
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由 Rusty Russell 提交于
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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