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Yajun Wu 923b8921d2 vhost-user: Support vhost_dev_start 
The motivation of adding vhost-user vhost_dev_start support is to
improve backend configuration speed and reduce live migration VM
downtime.

Today VQ configuration is issued one by one. For virtio net with
multi-queue support, backend needs to update RSS (Receive side
scaling) on every rx queue enable. Updating RSS is time-consuming
(typical time like 7ms).

Implement already defined vhost status and message in the vhost
specification [1].
(a) VHOST_USER_PROTOCOL_F_STATUS
(b) VHOST_USER_SET_STATUS
(c) VHOST_USER_GET_STATUS

Send message VHOST_USER_SET_STATUS with VIRTIO_CONFIG_S_DRIVER_OK for
device start and reset(0) for device stop.

On reception of the DRIVER_OK message, backend can apply the needed setting
only once (instead of incremental) and also utilize parallelism on enabling
queues.

This improves QEMU's live migration downtime with vhost user backend
implementation by great margin, specially for the large number of VQs of 64
from 800 msec to 250 msec.

[1] https://qemu-project.gitlab.io/qemu/interop/vhost-user.html

Signed-off-by: Yajun Wu <yajunw@nvidia.com>
Acked-by: Parav Pandit <parav@nvidia.com>
Message-Id: <20221017064452.1226514-3-yajunw@nvidia.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 		2022-11-07 14:08:17 -05:00
..
9pfs Pull request 2022-10-25 11:37:17 -04:00
acpi hw/acpi/erst.c: Fix memory handling issues 2022-11-07 14:08:17 -05:00
adc hw/adc: Make adci[*] R/W in NPCM7XX ADC 2022-07-18 13:20:14 +01:00
alpha hw: Remove unused MAX_IDE_BUS define 2022-10-31 11:32:07 +01:00
arm hw/arm/virt: Enable HMAT on arm virt machine 2022-11-07 14:08:17 -05:00
audio hw/audio/cs4231a: Const'ify global tables 2022-06-11 11:44:50 +02:00
avr Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
block vhost: Change the sequence of device start 2022-11-07 14:08:17 -05:00
char Drop useless casts from g_malloc() & friends to pointer 2022-10-22 23:15:40 +02:00
core hmat acpi: Don't require initiator value in -numa 2022-11-07 14:08:17 -05:00
cpu cpu/core: Fix "help" of CPU core device types 2021-04-09 16:05:16 -04:00
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/cdat: CXL CDAT Data Object Exchange implementation 2022-11-07 13:12:19 -05:00
display acpi: pc: vga: use AcpiDevAmlIf interface to build VGA device descriptors 2022-11-07 14:00:29 -05:00
dma treewide: Remove the unnecessary space before semicolon 2022-10-24 13:41:10 +02:00
gpio hw/gpio/meson: Introduce dedicated config switch for hw/gpio/mpc8xxx 2022-10-17 16:15:09 -03:00
hppa hw: Remove unused MAX_IDE_BUS define 2022-10-31 11:32:07 +01:00
hyperv hw/hyperv/hyperv.c: Use device_cold_reset() instead of device_legacy_reset() 2022-10-27 10:27:23 +01:00
i2c hw/i2c/aspeed: Fix old reg slave receive 2022-10-24 11:20:15 +02:00
i386 intel-iommu: PASID support 2022-11-07 14:08:17 -05:00
ide hw/ppc/mac.h: Rename to include/hw/nvram/mac_nvram.h 2022-10-31 18:48:23 +00:00
input pckbd: remove legacy i8042_mm_init() function 2022-07-18 19:28:46 +01:00
intc hw/ppc/mac.h: Rename to include/hw/nvram/mac_nvram.h 2022-10-31 18:48:23 +00:00
ipack qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
ipmi ipmi:smbus: Add a check around a memcpy 2022-08-01 06:40:50 -05:00
isa acpi: pc/q35: drop ad-hoc PCI-ISA bridge AML routines and let bus ennumeration generate AML 2022-11-07 14:08:17 -05:00
loongarch hw/arm, loongarch: Move load_image_to_fw_cfg() to common location 2022-10-14 14:29:50 +10:00
m68k m68k/q800: do not re-randomize RNG seed on snapshot load 2022-10-27 11:34:31 +01:00
mem hw/mem/cxl-type3: Add CXL CDAT Data Object Exchange 2022-11-07 13:12:19 -05:00
microblaze hw/microblaze: pass random seed to fdt 2022-09-21 19:59:56 +02:00
mips hw/mips/malta: Use bootloader helper to set BAR registers 2022-10-31 11:32:56 +01:00
misc mac_nvram: Use NVRAM_SIZE constant 2022-10-31 18:48:23 +00:00
net vhost: Change the sequence of device start 2022-11-07 14:08:17 -05:00
nios2 hw/nios2: set machine->fdt in nios2_load_dtb() 2022-10-17 16:15:10 -03:00
nubus qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
nvme msix: Assert that specified vector is in range 2022-11-07 14:08:17 -05:00
nvram hw/ppc/mac.h: Rename to include/hw/nvram/mac_nvram.h 2022-10-31 18:48:23 +00:00
openrisc openrisc: re-randomize rng-seed on reboot 2022-10-27 11:34:31 +01:00
pci msix: Assert that specified vector is in range 2022-11-07 14:08:17 -05:00
pci-bridge hw/pci-bridge/cxl-upstream: Add a CDAT table access DOE 2022-11-07 13:12:19 -05:00
pci-host hw/ppc/mac.h: Rename to include/hw/nvram/mac_nvram.h 2022-10-31 18:48:23 +00:00
pcmcia hw/pcmcia: Do not register PCMCIA type if not required 2021-05-02 17:24:50 +02:00
ppc mac_newworld: Turn CORE99_VIA_CONFIG defines into an enum 2022-10-31 18:48:23 +00:00
rdma msix: Assert that specified vector is in range 2022-11-07 14:08:17 -05:00
remote msix: Assert that specified vector is in range 2022-11-07 14:08:17 -05:00
riscv riscv: re-randomize rng-seed on reboot 2022-10-27 11:34:31 +01:00
rtc goldfish_rtc: Add big-endian property 2022-09-04 07:02:56 +01:00
rx rx: re-randomize rng-seed on reboot 2022-10-27 11:34:31 +01:00
s390x * Fix and test the VISTR instruction on s390x 2022-10-31 06:19:54 -04:00
scsi hw/scsi/vmw_pvscsi.c: Use device_cold_reset() to reset SCSI devices 2022-10-18 13:58:04 +02:00
sd hw/sd/sdhci: Rename ESDHC_* defines to USDHC_* 2022-10-28 13:26:20 -03:00
sensor hw/sensor: Add Renesas ISL69259 device model 2022-07-14 16:24:38 +02:00
sh4 Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
smbios hw/smbios: support for type 8 (port connector) 2022-10-09 16:38:45 -04:00
sparc machine: make memory-backend a link property 2022-05-12 12:29:44 +02:00
sparc64 hw: Remove unused MAX_IDE_BUS define 2022-10-31 11:32:07 +01:00
ssi aspeed/smc: Cache AspeedSMCClass 2022-10-24 11:20:15 +02:00
timer target/imx: reload cmp timer outside of the reload ptimer transaction 2022-10-27 10:27:23 +01:00
tpm tpm_crb: Avoid backend startup just before shutdown under Xen 2022-09-09 17:55:59 -04:00
tricore hw/tricore: fix inclusion of tricore_testboard 2021-07-20 20:10:21 +02:00
usb hw/usb: dev-mtp: Use g_mkdir() 2022-10-31 20:37:58 +00:00
vfio vfio: move implement of vfio_get_xlat_addr() to memory.c 2022-11-07 14:08:17 -05:00
virtio vhost-user: Support vhost_dev_start 2022-11-07 14:08:17 -05:00
watchdog watchdog: remove -watchdog option 2022-09-29 11:40:28 +02:00
xen hw/xen: set pci Atomic Ops requests for passthrough device 2022-09-27 14:23:23 +01:00
xenpv Warn user if the vga flag is passed but no vga device is created 2022-05-09 08:21:14 +02:00
xtensa hw/xtensa: fix reset value of MIROUT register of MX PIC 2022-05-06 15:27:40 -07:00
Kconfig hw/loongarch: Add support loongson3 virt machine type. 2022-06-06 18:09:03 +00:00
meson.build hw/loongarch: Add support loongson3 virt machine type. 2022-06-06 18:09:03 +00:00