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Huaitong Han a9403bfcd9 vhost: Don't set vring call if guest notifier is unused 
The vring call fd is set even when the guest does not use MSI-X (e.g., in the
case of virtio PMD), leading to unnecessary CPU overhead for processing
interrupts.

The commit 96a3d98d2c("vhost: don't set vring call if no vector") optimized the
case where MSI-X is enabled but the queue vector is unset. However, there's an
additional case where the guest uses INTx and the INTx_DISABLED bit in the PCI
config is set, meaning that no interrupt notifier will actually be used.

In such cases, the vring call fd should also be cleared to avoid redundant
interrupt handling.

Fixes: 96a3d98d2c("vhost: don't set vring call if no vector")

Reported-by: Zhiyuan Yuan <yuanzhiyuan@chinatelecom.cn>
Signed-off-by: Jidong Xia <xiajd@chinatelecom.cn>
Signed-off-by: Huaitong Han <hanht2@chinatelecom.cn>
Message-Id: <20250522100548.212740-1-hanht2@chinatelecom.cn>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2025-06-02 14:29:15 -04:00
..
9pfs 9pfs: fix 'total_open_fd' decrementation 2025-05-05 11:28:29 +02:00
acpi trivial patches for 2025-05-09 2025-05-12 11:11:27 -04:00
adc qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
alpha qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
arm hw/arm/fby35: Map BMC memory into system memory 2025-05-25 23:39:11 +02:00
audio hw/audio/asc: replace g_malloc0() with g_malloc() 2025-05-25 11:28:28 +02:00
avr qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
block vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
char vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
core scsi-disk: Advertise FUA support by default 2025-05-21 18:52:17 +02:00
cpu qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
cxl hw/cxl/cxl-mailbox-utils: CXL CCI Get/Set alert config commands 2025-05-14 05:39:14 -04:00
display virtio,pci,pc: fixes, features 2025-05-15 13:41:56 -04:00
dma hw/arm: Replace TABs for spaces in OMAP board and device code 2025-05-14 14:29:47 +01:00
fsi qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
gpio hw/arm: Replace TABs for spaces in OMAP board and device code 2025-05-14 14:29:47 +01:00
hppa qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
hyperv hw/hyperv/hyperv: common compilation unit 2025-05-08 14:22:12 +02:00
i2c hw/arm: Replace TABs for spaces in OMAP board and device code 2025-05-14 14:29:47 +01:00
i386 hw/i386/amd_iommu: Fix xtsup when vcpus < 255 2025-06-01 06:38:53 -04:00
ide qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
input vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
intc hw/intc/aspeed Fix coding style 2025-05-25 23:39:11 +02:00
ipack qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
ipmi qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
isa hw/isa/ich9: Remove stray empty comment 2025-05-09 23:49:26 +03:00
loongarch hw/loongarch/boot: Adjust the loading position of the initrd 2025-05-14 15:57:23 +08:00
m68k qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
mem hw/cxl/cxl-mailbox-utils: CXL CCI Get/Set alert config commands 2025-05-14 05:39:14 -04:00
microblaze hw/microblaze: Evaluate TARGET_BIG_ENDIAN at compile time 2025-04-25 17:09:58 +02:00
mips hw/mips: Evaluate TARGET_BIG_ENDIAN at compile time 2025-04-25 17:09:58 +02:00
misc hw/misc/aspeed_hace: Support to dump plaintext and digest for better debugging 2025-05-25 23:39:11 +02:00
net virtio,pci,pc: fixes, features 2025-05-15 13:41:56 -04:00
nubus qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
nvme hw/nvme: fix nvme hotplugging 2025-05-15 12:18:06 +02:00
nvram qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
openrisc qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
pci vhost: Don't set vring call if guest notifier is unused 2025-06-02 14:29:15 -04:00
pci-bridge qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
pci-host hw/pci-host/gt64120: Fix endianness handling 2025-05-20 08:04:18 +02:00
ppc include: Remove 'exec/exec-all.h' 2025-04-30 12:45:05 -07:00
remote qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
riscv target/riscv: store RISCVCPUDef struct directly in the class 2025-05-20 08:18:53 +02:00
rtc hw/rtc/mc146818rtc: Drop pre-v3 migration stream support 2025-04-30 20:44:20 +02:00
rx qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
s390x qapi: make s390x specific CPU commands unconditionally available 2025-05-28 18:56:08 +02:00
scsi scsi-disk: Advertise FUA support by default 2025-05-21 18:52:17 +02:00
sd qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
sensor qom: Constify TypeInfo::class_data 2025-04-25 17:00:41 +02:00
sh4 include: Remove 'exec/exec-all.h' 2025-04-30 12:45:05 -07:00
smbios ipmi: add fwinfo to pci ipmi devices 2025-04-11 10:50:42 -05:00
sparc qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
sparc64 qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
ssi hw/ssi/aspeed_smc: Allow 64-bit wide flash accesses 2025-05-05 09:38:55 +02:00
timer hw/arm: Replace TABs for spaces in OMAP board and device code 2025-05-14 14:29:47 +01:00
tpm qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
tricore qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
uefi qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
ufs qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
usb hw/usb/hcd-xhci: Unmap canceled packet 2025-04-25 17:00:42 +02:00
vfio system/runstate: add VM state change cb with return value 2025-05-14 05:39:14 -04:00
virtio vhost: Don't set vring call if guest notifier is unused 2025-06-02 14:29:15 -04:00
vmapple qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
watchdog qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
xen trivial patches for 2025-05-09 2025-05-12 11:11:27 -04:00
xenpv hw/boards: Do not create unusable default if=sd drives 2025-02-16 14:25:08 +01:00
xtensa qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
Kconfig Misc HW patches 2025-03-05 21:54:58 +08:00
meson.build Misc HW patches 2025-03-05 21:54:58 +08:00