kernel.git/drivers/vhost/vdpa.c, branch linux-5.8.y

vhost-vdpa: fix page pinning leakage in error path

2020-10-14T09:55:57Z

[ Upstream commit 7ed9e3d97c32d969caded2dfb6e67c1a2cc5a0b1 ] Pinned pages are not properly accounted particularly when mapping error occurs on IOTLB update. Clean up dangling pinned pages for the error path. As the inflight pinned pages, specifically for memory region that strides across multiple chunks, would need more than one free page for book keeping and accounting. For simplicity, pin pages for all memory in the IOVA range in one go rather than have multiple pin_user_pages calls to make up the entire region. This way it's easier to track and account the pages already mapped, particularly for clean-up in the error path. Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Signed-off-by: Si-Wei Liu Link: https://lore.kernel.org/r/1601701330-16837-3-git-send-email-si-wei.liu@oracle.com Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin

vhost-vdpa: fix vhost_vdpa_map() on error condition

2020-10-14T09:55:57Z

[ Upstream commit 1477c8aebb94a1db398c12d929a9d27bbd678d8c ] vhost_vdpa_map() should remove the iotlb entry just added if the corresponding mapping fails to set up properly. Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Signed-off-by: Si-Wei Liu Link: https://lore.kernel.org/r/1601701330-16837-2-git-send-email-si-wei.liu@oracle.com Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin

vhost_vdpa: Fix potential underflow in vhost_vdpa_mmap()

2020-06-22T16:34:21Z

The "vma->vm_pgoff" variable is an unsigned long so if it's larger than INT_MAX then "index" can be negative leading to an underflow. Fix this by changing the type of "index" to "unsigned long". Fixes: ddd89d0a059d ("vhost_vdpa: support doorbell mapping via mmap") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20200610085852.GB5439@mwanda Signed-off-by: Michael S. Tsirkin

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2020-06-10T20:42:09Z

Pull virtio updates from Michael Tsirkin: - virtio-mem: paravirtualized memory hotplug - support doorbell mapping for vdpa - config interrupt support in ifc - fixes all over the place * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (40 commits) vhost/test: fix up after API change virtio_mem: convert device block size into 64bit virtio-mem: drop unnecessary initialization ifcvf: implement config interrupt in IFCVF vhost: replace -1 with VHOST_FILE_UNBIND in ioctls vhost_vdpa: Support config interrupt in vdpa ifcvf: ignore continuous setting same status value virtio-mem: Don't rely on implicit compiler padding for requests virtio-mem: Try to unplug the complete online memory block first virtio-mem: Use -ETXTBSY as error code if the device is busy virtio-mem: Unplug subblocks right-to-left virtio-mem: Drop manual check for already present memory virtio-mem: Add parent resource for all added "System RAM" virtio-mem: Better retry handling virtio-mem: Offline and remove completely unplugged memory blocks mm/memory_hotplug: Introduce offline_and_remove_memory() virtio-mem: Allow to offline partially unplugged memory blocks mm: Allow to offline unmovable PageOffline() pages via MEM_GOING_OFFLINE virtio-mem: Paravirtualized memory hotunplug part 2 virtio-mem: Paravirtualized memory hotunplug part 1 ...

mmap locking API: use coccinelle to convert mmap_sem rwsem call sites

2020-06-09T16:39:14Z

This change converts the existing mmap_sem rwsem calls to use the new mmap locking API instead. The change is generated using coccinelle with the following rule: // spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir . @@ expression mm; @@ ( -init_rwsem +mmap_init_lock | -down_write +mmap_write_lock | -down_write_killable +mmap_write_lock_killable | -down_write_trylock +mmap_write_trylock | -up_write +mmap_write_unlock | -downgrade_write +mmap_write_downgrade | -down_read +mmap_read_lock | -down_read_killable +mmap_read_lock_killable | -down_read_trylock +mmap_read_trylock | -up_read +mmap_read_unlock ) -(&mm->mmap_sem) +(mm) Signed-off-by: Michel Lespinasse Signed-off-by: Andrew Morton Reviewed-by: Daniel Jordan Reviewed-by: Laurent Dufour Reviewed-by: Vlastimil Babka Cc: Davidlohr Bueso Cc: David Rientjes Cc: Hugh Dickins Cc: Jason Gunthorpe Cc: Jerome Glisse Cc: John Hubbard Cc: Liam Howlett Cc: Matthew Wilcox Cc: Peter Zijlstra Cc: Ying Han Link: http://lkml.kernel.org/r/20200520052908.204642-5-walken@google.com Signed-off-by: Linus Torvalds

vhost_vdpa: Support config interrupt in vdpa

2020-06-06T20:26:27Z

This commit implements config interrupt support in vhost_vdpa layer. Signed-off-by: Zhu Lingshan Acked-by: Jason Wang Link: https://lore.kernel.org/r/1591352835-22441-4-git-send-email-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin

vhost_vdpa: disable doorbell mapping for !MMU

2020-06-04T19:36:51Z

There could be ways to support doorbell mapping with !MMU, but things like pgprot_noncached are not universally supported. Fixable, but just disable this for now. Signed-off-by: Michael S. Tsirkin

vhost_vdpa: support doorbell mapping via mmap

2020-06-04T19:36:51Z

Currently the doorbell is relayed via eventfd which may have significant overhead because of the cost of vmexits or syscall. This patch introduces mmap() based doorbell mapping which can eliminate the overhead caused by vmexit or syscall. To ease the userspace modeling of the doorbell layout (usually virtio-pci), this patch starts from a doorbell per page model. Vhost-vdpa only support the hardware doorbell that sit at the boundary of a page and does not share the page with other registers. Doorbell of each virtqueue must be mapped separately, pgoff is the index of the virtqueue. This allows userspace to map a subset of the doorbell which may be useful for the implementation of software assisted virtqueue (control vq) in the future. Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200529080303.15449-5-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin

vhost: allow device that does not depend on vhost worker

2020-06-04T19:36:51Z

vDPA device currently relays the eventfd via vhost worker. This is inefficient due the latency of wakeup and scheduling, so this patch tries to introduce a use_worker attribute for the vhost device. When use_worker is not set with vhost_dev_init(), vhost won't try to allocate a worker thread and the vhost_poll will be processed directly in the wakeup function. This help for vDPA since it reduces the latency caused by vhost worker. In my testing, it saves 0.2 ms in pings between VMs on a mutual host. Signed-off-by: Zhu Lingshan Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200529080303.15449-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin

vhost: remove set but not used variable 'status'

2020-04-16T22:31:03Z

Fix the following gcc warning: drivers/vhost/vdpa.c:299:5: warning: variable 'status' set but not used [-Wunused-but-set-variable] u8 status; ^~~~~~ Reported-by: Hulk Robot Signed-off-by: Jason Yan Link: https://lore.kernel.org/r/20200402065106.20108-1-yanaijie@huawei.com Signed-off-by: Michael S. Tsirkin