We are reading a Big Block Mode value while in Sub Block Mode
when initializing. Fortunately, vm->bbm.bb_size maps to some counter
in the vm->sbm.mb_count array, which is 0 at that point in time.
No harm done; still, this was unintended and is not future-proof.
Fixes: 4ba50cd335 ("virtio-mem: Big Block Mode (BBM) memory hotplug")
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20210602185720.31821-2-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Clear the available index as part of the initialization process to
clear and values that might be left from previous usage of the device.
For example, if the device was previously used by vhost_vdpa and now
probed by vhost_vdpa, you want to start with indices.
Fixes: c043b4a8cf ("virtio: introduce a vDPA based transport")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210602021536.39525-5-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
For split virtqueue, we used to depend on the address, length and
flags stored in the descriptor ring for DMA unmapping. This is unsafe
for the case since the device can manipulate the behavior of virtio
driver, IOMMU drivers and swiotlb.
For safety, maintain the DMA address, DMA length, descriptor flags and
next filed of the non indirect descriptors in vring_desc_state_extra
when DMA API is used for virtio as we did for packed virtqueue and use
those metadata for performing DMA operations. Indirect descriptors
should be safe since they are using streaming mappings.
With this the descriptor ring is write only form the view of the
driver.
This slight increase the footprint of the drive but it's not noticed
through pktgen (64B) test and netperf test in the case of virtio-net.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210604055350.58753-8-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
We should not depend on the DMA address, length and flag of descriptor
table since they could be wrote with arbitrary value by the device. So
this patch switches to use the stored one in desc_extra.
Note that the indirect descriptors are fine since they are read-only
streaming mappings.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210604055350.58753-5-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio_disable_cb is currently a nop for split ring with event index.
This is because it used to be always called from a callback when we know
device won't trigger more events until we update the index. However,
now that we run with interrupts enabled a lot we also poll without a
callback so that is different: disabling callbacks will help reduce the
number of spurious interrupts.
Further, if using event index with a packed ring, and if being called
from a callback, we actually do disable interrupts which is unnecessary.
Fix both issues by tracking whenever we get a callback. If that is
the case disabling interrupts with event index can be a nop.
If not the case disable interrupts. Note: with a split ring
there's no explicit "no interrupts" value. For now we write
a fixed value so our chance of triggering an interupt
is 1/ring size. It's probably better to write something
related to the last used index there to reduce the chance
even further. For now I'm keeping it simple.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The page reporting won't be triggered if the freeing page can't come up
with a free area, whose size is equal or bigger than the threshold (page
reporting order). The default page reporting order, equal to
@pageblock_order, is too huge on some architectures to trigger page
reporting. One example is ARM64 when 64KB base page size is used.
PAGE_SIZE: 64KB
pageblock_order: 13 (512MB)
MAX_ORDER: 14
This specifies the page reporting order to 5 (2MB) for this specific case
so that page reporting can be triggered.
Link: https://lkml.kernel.org/r/20210625014710.42954-5-gshan@redhat.com
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When switching virtio_pci_modern to use a helper for mappings we lost an
__iomem tag. Restore it.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 9e3bb9b79a ("virtio_pci_modern: introduce helper to map vq notify area")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
When switching virtio_pci_modern to use a helper for mappings we lost an
__iomem tag. We should restore it.
However, virtio_pci_modern is playing tricks by hiding an iomem pointer
in a regular vq->priv pointer. Which is okay as long as it's
all contained within a single file, but we need to __force cast
the value otherwise we'll get sparse warnings.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 7dca6c0ea9 ("virtio-pci library: switch to use vp_modern_map_vq_notify()")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Pull virtio fixes from Michael Tsirkin:
"Some fixes and cleanups all over the place"
* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
vhost-vdpa: set v->config_ctx to NULL if eventfd_ctx_fdget() fails
vhost-vdpa: fix use-after-free of v->config_ctx
vhost: Fix vhost_vq_reset()
vhost_vdpa: fix the missing irq_bypass_unregister_producer() invocation
vdpa_sim: Skip typecasting from void*
virtio: remove export for virtio_config_{enable, disable}
virtio-mmio: Use to_virtio_mmio_device() to simply code
vdpa: set the virtqueue num during register
Merge more updates from Andrew Morton:
"118 patches:
- The rest of MM.
Includes kfence - another runtime memory validator. Not as thorough
as KASAN, but it has unmeasurable overhead and is intended to be
usable in production builds.
- Everything else
Subsystems affected by this patch series: alpha, procfs, sysctl,
misc, core-kernel, MAINTAINERS, lib, bitops, checkpatch, init,
coredump, seq_file, gdb, ubsan, initramfs, and mm (thp, cma,
vmstat, memory-hotplug, mlock, rmap, zswap, zsmalloc, cleanups,
kfence, kasan2, and pagemap2)"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (118 commits)
MIPS: make userspace mapping young by default
initramfs: panic with memory information
ubsan: remove overflow checks
kgdb: fix to kill breakpoints on initmem after boot
scripts/gdb: fix list_for_each
x86: fix seq_file iteration for pat/memtype.c
seq_file: document how per-entry resources are managed.
fs/coredump: use kmap_local_page()
init/Kconfig: fix a typo in CC_VERSION_TEXT help text
init: clean up early_param_on_off() macro
init/version.c: remove Version_<LINUX_VERSION_CODE> symbol
checkpatch: do not apply "initialise globals to 0" check to BPF progs
checkpatch: don't warn about colon termination in linker scripts
checkpatch: add kmalloc_array_node to unnecessary OOM message check
checkpatch: add warning for avoiding .L prefix symbols in assembly files
checkpatch: improve TYPECAST_INT_CONSTANT test message
checkpatch: prefer ftrace over function entry/exit printks
checkpatch: trivial style fixes
checkpatch: ignore warning designated initializers using NR_CPUS
checkpatch: improve blank line after declaration test
...
In 'commit 29cc309d8b ("HID: hid-multitouch: forward MSC_TIMESTAMP")',
EV_MSC/MSC_TIMESTAMP is added to each before EV_SYN event. EV_MSC is
configured as INPUT_PASS_TO_ALL.
In case of a touch device which report MSC_TIMESTAMP:
BE pass EV_MSC/MSC_TIMESTAMP to FE on receiving event from evdev.
FE pass EV_MSC/MSC_TIMESTAMP back to BE.
BE writes EV_MSC/MSC_TIMESTAMP to evdev due to INPUT_PASS_TO_ALL.
BE receives extra EV_MSC/MSC_TIMESTAMP and pass to FE.
>>> Each new frame becomes larger and larger.
Disable EV_MSC/MSC_TIMESTAMP forwarding for MT.
V2: Rebase.
Signed-off-by: Colin Xu <colin.xu@intel.com>
Link: https://lore.kernel.org/r/20210202001923.6227-1-colin.xu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Pull virtio updates from Michael Tsirkin:
- vdpa sim refactoring
- virtio mem: Big Block Mode support
- misc cleanus, fixes
* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (61 commits)
vdpa: Use simpler version of ida allocation
vdpa: Add missing comment for virtqueue count
uapi: virtio_ids: add missing device type IDs from OASIS spec
uapi: virtio_ids.h: consistent indentions
vhost scsi: fix error return code in vhost_scsi_set_endpoint()
virtio_ring: Fix two use after free bugs
virtio_net: Fix error code in probe()
virtio_ring: Cut and paste bugs in vring_create_virtqueue_packed()
tools/virtio: add barrier for aarch64
tools/virtio: add krealloc_array
tools/virtio: include asm/bug.h
vdpa/mlx5: Use write memory barrier after updating CQ index
vdpa: split vdpasim to core and net modules
vdpa_sim: split vdpasim_virtqueue's iov field in out_iov and in_iov
vdpa_sim: make vdpasim->buffer size configurable
vdpa_sim: use kvmalloc to allocate vdpasim->buffer
vdpa_sim: set vringh notify callback
vdpa_sim: add set_config callback in vdpasim_dev_attr
vdpa_sim: add get_config callback in vdpasim_dev_attr
vdpa_sim: make 'config' generic and usable for any device type
...
