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qemu-e2k/include/hw
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Stefan Hajnoczi d0435bc513 virtio: don't enable notifications during polling 
Virtqueue notifications are not necessary during polling, so we disable
them.  This allows the guest driver to avoid MMIO vmexits.
Unfortunately the virtio-blk and virtio-scsi handler functions re-enable
notifications, defeating this optimization.

Fix virtio-blk and virtio-scsi emulation so they leave notifications
disabled.  The key thing to remember for correctness is that polling
always checks one last time after ending its loop, therefore it's safe
to lose the race when re-enabling notifications at the end of polling.

There is a measurable performance improvement of 5-10% with the null-co
block driver.  Real-life storage configurations will see a smaller
improvement because the MMIO vmexit overhead contributes less to
latency.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20191209210957.65087-1-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 		2020-01-05 07:03:03 -05:00
..
acpi piix4: Add a MC146818 RTC Controller as specified in datasheet 2019-11-05 23:33:12 +01:00
adc include: Make headers more self-contained 2019-08-16 13:31:51 +02:00
arm hw/arm/virt: Simplify by moving the gic in the machine state 2019-12-16 10:46:35 +00:00
audio Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
block block: Support providing LCHS from user 2019-10-31 11:47:11 -04:00
char escc: introduce a selector for the register bit 2019-09-07 08:32:12 +02:00
core Remove unassigned_access CPU hook 2019-11-11 13:44:16 +00:00
cpu Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
cris Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
display hw/m68k: add Nubus macfb video card 2019-10-28 19:06:49 +01:00
dma Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
firmware machine: Refactor smp-related call chains to pass MachineState 2019-07-05 17:07:36 -03:00
gpio hw/gpio: Add basic Aspeed GPIO model for AST2400 and AST2500 2019-09-13 16:05:00 +01:00
hyperv hyperv: process POST_MESSAGE hypercall 2018-10-19 13:44:14 +02:00
i2c aspeed/i2c: Add support for DMA transfers 2019-12-16 10:46:34 +00:00
i386 hw/i386/pc: Extract the port92 device 2019-12-17 19:33:51 +01:00
ide sysemu: Move the VMChangeStateEntry typedef to qemu/typedefs.h 2019-08-16 13:31:53 +02:00
input Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
intc hw: replace hw/i386/pc.h with a header just for the i8259 2019-12-17 19:33:49 +01:00
ipack Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
ipmi ipmi: Add support to customize OEM functions 2019-12-17 10:39:47 +11:00
isa hw/isa/isa-bus: cleanup irq functions 2019-12-17 19:33:51 +01:00
kvm Supply missing header guards 2019-06-12 13:20:21 +02:00
lm32 Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
m68k m68k: Add NeXTcube machine 2019-09-07 08:31:51 +02:00
mem Include sysemu/hostmem.h less 2019-08-16 13:31:53 +02:00
mips Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
misc hw/m68k: implement ADB bus support for via 2019-10-28 19:06:45 +01:00
net aspeed: add support for the Aspeed MII controller of the AST2600 2019-10-15 18:09:05 +01:00
nubus hw/m68k: add Nubus support 2019-10-28 19:06:47 +01:00
nvram fw_cfg: add "modify" functions for all types 2019-10-22 09:39:54 +02:00
pci hw/pci: Remove the "command_serr_enable" property 2019-12-18 02:34:12 +01:00
pci-bridge Supply missing header guards 2019-06-12 13:20:21 +02:00
pci-host hw/pci-host/i440fx: Extract PCII440FXState to "hw/pci-host/i440fx.h" 2019-12-18 02:34:11 +01:00
ppc ppc/pnv: Drop PnvChipClass::type 2019-12-17 10:59:11 +11:00
rdma {hmp, hw/pvrdma}: Expose device internals via monitor interface 2019-03-16 15:52:44 +02:00
riscv hw/riscv: Add optional symbol callback ptr to riscv_load_kernel() 2019-11-25 12:34:52 -08:00
rtc Merge commit 'df84f17' into HEAD 2019-10-26 15:38:02 +02:00
s390x Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
scsi scsi: Propagate unrealize() callback to scsi-hd 2019-10-31 11:47:25 -04:00
sd hw/sd/sdhci: Add dummy Samsung SDHCI controller 2019-10-22 17:44:00 +01:00
semihosting include: Make headers more self-contained 2019-08-16 13:31:51 +02:00
sh4 Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
southbridge hw/pci-host/piix: Extract PIIX3 functions to hw/isa/piix3.c 2019-11-05 23:33:12 +01:00
sparc Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
ssi aspeed/smc: Add AST2600 timings registers 2019-12-16 10:46:34 +00:00
timer Fix typos and docs, trivial changes and RTC devices split 2019-10-25 14:17:08 +01:00
tricore Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
unicore32 hw/unicore32: restrict hw addr defines to source file 2017-12-18 17:07:02 +03:00
usb usb: Add basic code to emulate Chipidea USB IP 2018-02-09 10:40:30 +00:00
vfio vfio: Turn the container error into an Error handle 2019-10-04 18:49:18 +02:00
virtio virtio: don't enable notifications during polling 2020-01-05 07:03:03 -05:00
watchdog watchdog/aspeed: Fix AST2600 frequency behaviour 2019-12-16 10:46:34 +00:00
xen global: Squash 'the the' 2019-11-06 17:19:40 +01:00
xtensa Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
boards.h kvm: convert "-machine kernel_irqchip" to an accelerator property 2019-12-17 19:32:46 +01:00
elf_ops.h elf-ops.h: fix int overflow in load_elf() 2019-09-16 12:32:21 +02:00
empty_slot.h include: Make headers more self-contained 2019-08-16 13:31:51 +02:00
fw-path-provider.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
hotplug.h qom: make interface types abstract 2018-12-11 15:45:22 -02:00
hw.h Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
ide.h ide/via: Rename functions to match device name 2019-01-25 14:52:12 -05:00
irq.h Revert "irq: introduce qemu_irq_proxy()" 2019-11-05 23:33:12 +01:00
loader-fit.h Use #include "..." for our own headers, <...> for others 2018-02-09 05:05:11 +01:00
loader.h elf-ops.h: fix int overflow in load_elf() 2019-09-16 12:32:21 +02:00
nmi.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
or-irq.h Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
pcmcia.h Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
platform-bus.h platform-bus-device: use device plug callback instead of machine_done notifier 2018-05-10 18:10:56 +01:00
ptimer.h ptimer: Remove old ptimer_init_with_bh() API 2019-11-11 13:44:16 +00:00
qdev-core.h migration: allow unplug during migration for failover devices 2019-10-29 18:55:26 -04:00
qdev-dma.h Supply missing header guards 2019-06-12 13:20:21 +02:00
qdev-properties.h qdev: Add a no default uuid property 2019-09-20 14:09:02 -05:00
register.h hw: register: Run post_write hook on reset 2018-03-01 11:05:43 +00:00
registerfields.h Use #include "..." for our own headers, <...> for others 2018-02-09 05:05:11 +01:00
stream.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
sysbus.h Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
usb.h Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00