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d501f97d96
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Ilya Maximets d501f97d96 virtio: remove unnecessary thread fence while reading next descriptor 
It was supposed to be a compiler barrier and it was a compiler barrier
initially called 'wmb' when virtio core support was introduced.
Later all the instances of 'wmb' were switched to smp_wmb to fix memory
ordering issues on non-x86 platforms.  However, this one doesn't need
to be an actual barrier, as its only purpose was to ensure that the
value is not read twice.

And since commit aa570d6fb6 ("virtio: combine the read of a descriptor")
there is no need for a barrier at all, since we're no longer reading
guest memory here, but accessing a local structure.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Message-Id: <20230927140016.2317404-2-i.maximets@ovn.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2023-10-04 18:15:06 -04:00
..
9pfs fsdev: Use ThrottleDirection instread of bool is_write 2023-08-29 10:49:24 +02:00
acpi hw/acpi/core: Trace enable and status registers of GPE separately 2023-10-04 18:15:05 -04:00
adc meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
alpha hw/alpha: Use MachineClass->default_nic in the alpha machine 2023-05-26 09:10:49 +02:00
arm sbsa-ref: add non-secure EL2 virtual timer 2023-09-21 16:07:14 +01:00
audio hw/audio/lm4549: Add errp error reporting to init function 2023-09-22 16:30:07 +02:00
avr Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
block hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
char hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
core pci: SLT must be RO 2023-10-04 04:53:52 -04:00
cpu hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
cris Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
cxl hw/cxl: Support 4 HDM decoders at all levels of topology 2023-10-04 18:15:06 -04:00
display hw/display/xlnx_dp.c: Add audiodev property 2023-09-22 16:30:07 +02:00
dma hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
gpio hw/gpio/nrf51: implement DETECT signal 2023-08-22 17:30:59 +01:00
hppa target/hppa: Report and clear BTLBs via fw_cfg at startup 2023-09-15 17:34:38 +02:00
hyperv win32: replace closesocket() with close() wrapper 2023-03-13 15:39:31 +04:00
i2c aspeed queue: 2023-09-06 11:14:55 -04:00
i386 hw/i386/pc: improve physical address space bound check for 32-bit x86 systems 2023-10-04 18:15:06 -04:00
ide hw/ide/ahci: fix broken SError handling 2023-09-06 22:48:04 -04:00
input * add host ticks function for RISC-V 2023-09-25 10:09:38 -04:00
intc hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
ipack meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
ipmi hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
isa hw/acpi/acpi_dev_interface: Remove now unused madt_cpu virtual method 2023-10-04 18:15:05 -04:00
loongarch hw/loongarch: Fix ACPI processor id off-by-one error 2023-08-24 16:58:16 +08:00
m68k hw: Add compat machines for 8.2 2023-08-23 12:06:39 +02:00
mem hw/cxl: Support 4 HDM decoders at all levels of topology 2023-10-04 18:15:06 -04:00
microblaze trivial: Simplify the spots that use TARGET_BIG_ENDIAN as a numeric value 2023-09-08 13:08:52 +03:00
mips hw/mips/jazz: Simplify the NIC setup code 2023-09-25 07:58:14 +02:00
misc hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
net virtio-net: Expose MAX_VLAN 2023-10-04 04:54:09 -04:00
nios2 trivial: Simplify the spots that use TARGET_BIG_ENDIAN as a numeric value 2023-09-08 13:08:52 +03:00
nubus trace-events: Fix the name of the tracing.rst file 2023-09-08 13:08:51 +03:00
nvme trivial patches for 2023-09-21 2023-09-21 09:32:47 -04:00
nvram hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
openrisc *: Add missing includes of qemu/error-report.h 2023-03-22 15:06:57 +00:00
pci pcie_sriov: unregister_vfs(): fix error path 2023-10-04 18:15:06 -04:00
pci-bridge hw/pci-bridge/cxl-upstream: Add serial number extended capability support 2023-10-04 18:15:06 -04:00
pci-host hw/pci: spelling fixes 2023-09-20 07:54:34 +03:00
pcmcia meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
ppc ppc: spelling fixes 2023-09-20 07:54:34 +03:00
rdma meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
remote exec/memory: Add symbol for memory listener priority for device backend 2023-06-28 14:27:59 +02:00
riscv hw/riscv/virt.c: fix non-KVM --enable-debug build 2023-09-11 11:45:55 +10:00
rtc hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
rx hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
s390x s390x: do a subsystem reset before the unprotect on reboot 2023-09-12 11:13:33 +02:00
scsi vhost-user: move VhostUserProtocolFeature definition to header file 2023-10-04 04:54:28 -04:00
sd aspeed queue: 2023-09-06 11:14:55 -04:00
sensor hw/i2c: spelling fixes 2023-08-31 19:47:43 +02:00
sh4 hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
smbios hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
sparc other architectures: spelling fixes 2023-07-25 17:14:07 +03:00
sparc64 hw/pci/pci: Remove multifunction parameter from pci_new_multifunction() 2023-07-10 18:59:32 -04:00
ssi hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
timer hw/other: spelling fixes 2023-09-21 11:31:16 +03:00
tpm hw/tpm: spelling fixes 2023-09-20 07:54:34 +03:00
tricore hw/tricore: fix inclusion of tricore_testboard 2021-07-20 20:10:21 +02:00
ufs hw/ufs: Support for UFS logical unit 2023-09-07 14:01:29 -04:00
usb hw/usb/hcd-xhci: Avoid variable-length array in xhci_get_port_bandwidth() 2023-08-31 19:47:43 +02:00
vfio spapr: Remove support for NVIDIA V100 GPU with NVLink2 2023-09-18 07:25:28 -03:00
virtio virtio: remove unnecessary thread fence while reading next descriptor 2023-10-04 18:15:06 -04:00
watchdog meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
xen xen: spelling fix 2023-09-08 13:08:52 +03:00
xenpv hw/xenpv: Initialize Xen backend operations 2023-03-24 14:52:14 +00:00
xtensa trivial: Simplify the spots that use TARGET_BIG_ENDIAN as a numeric value 2023-09-08 13:08:52 +03:00
Kconfig hw/ufs: Initial commit for emulated Universal-Flash-Storage 2023-09-07 14:01:29 -04:00
meson.build hw/ufs: Initial commit for emulated Universal-Flash-Storage 2023-09-07 14:01:29 -04:00