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d4ff2135eb
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Maxime Coquelin d4ff2135eb vhost: enforce avail index and desc read ordering 
A read barrier is required to ensure the ordering between
available index and the descriptor reads is enforced.

1. read avail_head = avail->idx
2. read cur_idx = last_avail_idx
if (cur_idx != avail_head) {
    3. read idx = avail->ring[cur_idx]
    4. read desc[idx]
}

There is a control dependency between step 1 and steps 3 & 4,
3 could be speculatively executed before 1, which could result
in 'idx' to not being updated yet.

Fixes: 4796ad63ba ("examples/vhost: import userspace vhost application")
Cc: stable@dpdk.org

Reported-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Tiwei Bie <tiwei.bie@intel.com>
2018-12-21 16:22:41 +01:00
..
librte_acl lib: fix shifting 32-bit signed variable 31 times 2018-11-06 01:14:05 +01:00
librte_bbdev bbdev: add missing experimental tags and map entries 2018-12-19 19:36:53 +01:00
librte_bitratestats bitrate: add sanity check on parameters 2018-07-26 20:07:57 +02:00
librte_bpf bpf: fix x86 JIT for immediate loads 2018-11-13 23:18:53 +01:00
librte_cfgfile fix indentation in symbol maps 2018-11-26 20:16:46 +01:00
librte_cmdline ethdev: support MAC address as iterator filter 2018-10-26 22:14:06 +02:00
librte_compat buildtools: change license to SPDX 2018-07-26 22:45:17 +02:00
librte_compressdev compressdev: fix structure comment 2018-12-19 11:19:10 +01:00
librte_cryptodev fix indentation in symbol maps 2018-11-26 20:16:46 +01:00
librte_distributor build: set compat lib as universal dependency 2018-01-30 21:59:00 +01:00
librte_eal malloc: fix deadlock when reading stats 2018-12-21 15:26:43 +01:00
librte_efd efd: fix write unlock during ring creation 2018-11-18 15:46:02 +01:00
librte_ethdev ethdev: fix typo in queue setup error log 2018-12-13 17:45:59 +00:00
librte_eventdev eventdev: fix eth Tx adapter queue count checks 2018-12-17 20:25:10 +01:00
librte_flow_classify flow_classify: do not check for invalid socket ID 2018-10-11 10:37:45 +02:00
librte_gro gro: fix overflow of payload length calculation 2018-12-19 04:29:57 +01:00
librte_gso gso: support UDP/IPv4 fragmentation 2018-07-11 23:45:20 +02:00
librte_hash hash: fix out-of-bound write while freeing key slot 2018-12-21 01:53:33 +01:00
librte_ip_frag ip_frag: fix IPv6 when MTU sizes not aligned to 8 bytes 2018-12-19 22:40:08 +01:00
librte_jobstats build: replace license text with SPDX tag 2018-01-30 21:58:59 +01:00
librte_kni kni: fix possible uninitialized variable 2018-11-23 01:43:35 +01:00
librte_kvargs kvargs: support list value 2018-10-26 22:14:06 +02:00
librte_latencystats latency: fix timestamp marking and latency calculation 2018-10-25 10:30:13 +02:00
librte_lpm lpm6: add incremental update on delete 2018-09-19 17:11:37 +02:00
librte_mbuf ethdev: support metadata as flow rule criteria 2018-10-26 22:14:05 +02:00
librte_member remove useless constructor headers 2018-07-12 00:00:35 +02:00
librte_mempool malloc: add function to check if socket is external 2018-10-11 11:11:25 +02:00
librte_meter meter: remove experimental tag from profile API 2018-08-06 01:15:11 +02:00
librte_metrics metrics: disallow null as metric name 2018-07-26 20:30:18 +02:00
librte_net net: fix underflow for checksum of invalid IPv4 packets 2018-12-21 16:22:41 +01:00
librte_pci pci: fix parsing of address without function number 2018-11-13 17:59:42 +01:00
librte_pdump pdump: remove deprecated APIs 2018-12-19 01:25:56 +01:00
librte_pipeline pipeline: fix logically dead code 2018-11-12 17:45:23 +01:00
librte_port port: add symmetric crypto 2018-10-12 19:33:02 +02:00
librte_power power: add p-state driver compatibility 2018-12-21 01:33:59 +01:00
librte_rawdev lib: reduce global variable usage 2018-10-29 02:34:27 +01:00
librte_reorder build: replace license text with SPDX tag 2018-01-30 21:58:59 +01:00
librte_ring ring/c11: relax ordering for load and store of the head 2018-11-13 17:00:58 +01:00
librte_sched mk: build with _GNU_SOURCE defined by default 2018-10-22 11:28:27 +02:00
librte_security security: restore experimental tag for unimplemented APIs 2018-11-23 02:03:33 +01:00
librte_table lib/librte_table: add hash function headers 2018-10-12 17:58:53 +02:00
librte_telemetry build: add dependency on telemetry to apps with meson 2018-10-27 15:21:33 +02:00
librte_timer timer: fix race condition 2018-12-19 20:56:09 +01:00
librte_vhost vhost: enforce avail index and desc read ordering 2018-12-21 16:22:41 +01:00
Makefile telemetry: introduce infrastructure 2018-10-27 15:18:20 +02:00
meson.build build: change default driver installation directory 2018-10-27 23:22:12 +02:00