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3 commits

Author SHA1 Message Date
Maximilian Heyne
46a0f70700 virtio-mmio: fix memory leak of vm_dev 
commit fab7f259227b8f70aa6d54e1de1a1f5f4729041c upstream.

With the recent removal of vm_dev from devres its memory is only freed
via the callback virtio_mmio_release_dev. However, this only takes
effect after device_add is called by register_virtio_device. Until then
it's an unmanaged resource and must be explicitly freed on error exit.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Cc: stable@vger.kernel.org
Fixes: 55c91fedd03d ("virtio-mmio: don't break lifecycle of vm_dev")
Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Message-Id: <20230911090328.40538-1-mheyne@amazon.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
 2024-11-18 10:58:28 +01:00
Gavin Shan
9b36212050 virtio_balloon: Fix endless deflation and inflation on arm64 
commit 07622bd415639e9709579f400afd19e7e9866e5e upstream.

The deflation request to the target, which isn't unaligned to the
guest page size causes endless deflation and inflation actions. For
example, we receive the flooding QMP events for the changes on memory
balloon's size after a deflation request to the unaligned target is
sent for the ARM64 guest, where we have 64KB base page size.

  /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64      \
  -accel kvm -machine virt,gic-version=host -cpu host          \
  -smp maxcpus=8,cpus=8,sockets=2,clusters=2,cores=2,threads=1 \
  -m 1024M,slots=16,maxmem=64G                                 \
  -object memory-backend-ram,id=mem0,size=512M                 \
  -object memory-backend-ram,id=mem1,size=512M                 \
  -numa node,nodeid=0,memdev=mem0,cpus=0-3                     \
  -numa node,nodeid=1,memdev=mem1,cpus=4-7                     \
    :                                                          \
  -device virtio-balloon-pci,id=balloon0,bus=pcie.10

  { "execute" : "balloon", "arguments": { "value" : 1073672192 } }
  {"return": {}}
  {"timestamp": {"seconds": 1693272173, "microseconds": 88667},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272174, "microseconds": 89704},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272175, "microseconds": 90819},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272176, "microseconds": 91961},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272177, "microseconds": 93040},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073676288}}
  {"timestamp": {"seconds": 1693272178, "microseconds": 94117},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073676288}}
  {"timestamp": {"seconds": 1693272179, "microseconds": 95337},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272180, "microseconds": 96615},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073676288}}
  {"timestamp": {"seconds": 1693272181, "microseconds": 97626},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272182, "microseconds": 98693},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073676288}}
  {"timestamp": {"seconds": 1693272183, "microseconds": 99698},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272184, "microseconds": 100727},  \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272185, "microseconds": 90430},   \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  {"timestamp": {"seconds": 1693272186, "microseconds": 102999},  \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073676288}}
     :
  <The similar QMP events repeat>

Fix it by aligning the target up to the guest page size, 64KB in this
specific case. With this applied, no flooding QMP events are observed
and the memory balloon's size can be stablizied to 0x3ffe0000 soon
after the deflation request is sent.

  { "execute" : "balloon", "arguments": { "value" : 1073672192 } }
  {"return": {}}
  {"timestamp": {"seconds": 1693273328, "microseconds": 793075},  \
   "event": "BALLOON_CHANGE", "data": {"actual": 1073610752}}
  { "execute" : "query-balloon" }
  {"return": {"actual": 1073610752}}

Cc: stable@vger.kernel.org
Signed-off-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Message-Id: <20230831011007.1032822-1-gshan@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2024-11-18 10:58:28 +01:00
Gabriel2392
7ed7ee9edf Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00