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2e53b0b450
qemu/hw
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Jinhao Fan 2e53b0b450 hw/nvme: Use ioeventfd to handle doorbell updates 
Add property "ioeventfd" which is enabled by default. When this is
enabled, updates on the doorbell registers will cause KVM to signal
an event to the QEMU main loop to handle the doorbell updates.
Therefore, instead of letting the vcpu thread run both guest VM and
IO emulation, we now use the main loop thread to do IO emulation and
thus the vcpu thread has more cycles for the guest VM.

Since ioeventfd does not tell us the exact value that is written, it is
only useful when shadow doorbell buffer is enabled, where we check
for the value in the shadow doorbell buffer when we get the doorbell
update event.

IOPS comparison on Linux 5.19-rc2: (Unit: KIOPS)

qd           1   4  16  64
qemu        35 121 176 153
ioeventfd   41 133 258 313

Changes since v3:
 - Do not deregister ioeventfd when it was not enabled on a SQ/CQ

Signed-off-by: Jinhao Fan <fanjinhao21s@ict.ac.cn>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
2022-07-15 10:40:33 +02:00
..
9pfs trivial typos: namesapce 2022-06-28 11:06:44 +02:00
acpi trivial typos: namesapce 2022-06-28 11:06:44 +02:00
adc hw/adc/zynq-xadc: Use qemu_irq typedef 2022-05-19 16:19:02 +01:00
alpha Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
arm block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
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 block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
char acpi: serial-is: replace ISADeviceClass::build_aml with AcpiDevAmlIfClass:build_dev_aml 2022-06-09 19:32:48 -04:00
core qdev: unplug blocker for devices 2022-06-15 14:50:41 +01:00
cpu
cris
cxl pci-bridge/cxl_downstream: Add a CXL switch downstream port 2022-06-16 12:54:57 -04:00
display hw/i2c: add asynchronous send 2022-06-30 09:21:14 +02:00
dma ptimer: Rename PTIMER_POLICY_DEFAULT to PTIMER_POLICY_LEGACY 2022-05-19 16:19:03 +01:00
gpio hw/gpio: replace HWADDR_PRIx with PRIx64 2022-05-25 10:31:33 +02:00
hppa lasips2: move mapping of LASIPS2 registers to HPPA machine 2022-06-26 18:40:12 +01:00
hyperv hw/hyperv/vmbus: Remove unused vmbus_load/save_req() 2022-05-30 19:49:42 +02:00
i2c hw/i2c/aspeed: Add new-registers DMA slave mode RX support 2022-06-30 09:21:14 +02:00
i386 hw/i386/xen/xen-hvm: Inline xen_piix_pci_write_config_client() and remove it 2022-06-29 00:24:59 +02:00
ide block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
input ps2: remove update_irq() function and update_arg parameter 2022-06-26 18:40:12 +01:00
intc ppc: Define SETFIELD for the ppc target 2022-07-06 10:22:38 -03:00
ipack
ipmi acpi: ipmi: use AcpiDevAmlIf interface to build IPMI device descriptors 2022-06-09 19:32:49 -04:00
isa hw/i386/xen/xen-hvm: Inline xen_piix_pci_write_config_client() and remove it 2022-06-29 00:24:59 +02:00
loongarch hw/intc/loongarch_ipi: Fix ipi device access of 64bits 2022-07-05 16:25:17 +05:30
m68k m68k: virt: pass RNG seed via bootinfo block 2022-07-06 12:30:41 +02:00
mem mem/cxl_type3: Add read and write functions for associated hostmem. 2022-05-13 07:57:26 -04:00
microblaze Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
mips pckbd: move mapping of I8042_MMIO registers to MIPS magnum machine 2022-06-26 18:40:12 +01:00
misc block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
net e1000: set RX descriptor status in a separate operation 2022-07-06 11:39:09 +08:00
nios2 hw/nios2: Machine with a Vectored Interrupt Controller 2022-04-26 08:17:05 -07:00
nubus
nvme hw/nvme: Use ioeventfd to handle doorbell updates 2022-07-15 10:40:33 +02:00
nvram block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
openrisc hw/openrisc: use right OMPIC size variable 2022-05-15 10:33:01 +09:00
pci trivial patches pull request 20220629 2022-06-30 04:49:40 +05:30
pci-bridge pci-bridge/cxl_downstream: Add a CXL switch downstream port 2022-06-16 12:54:57 -04:00
pci-host ppc: Define SETFIELD for the ppc target 2022-07-06 10:22:38 -03:00
pcmcia
ppc block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
rdma hw/pvrdma: Some cosmetic fixes 2022-04-26 12:25:14 +02:00
remote vfio-user: handle reset of remote device 2022-06-15 16:43:42 +01:00
riscv hw/riscv: boot: Reduce FDT address alignment constraints 2022-07-03 10:03:20 +10:00
rtc hw/rtc/ls7a_rtc: Drop unused inline functions 2022-07-05 16:17:53 +05:30
rx hw/rx: rx-gdbsim DTB load address aligned of 16byte. 2022-04-21 10:06:42 -07:00
s390x virtio: stop ioeventfd on reset 2022-06-14 16:50:30 +02:00
scsi scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216) 2022-07-06 09:31:15 +02:00
sd block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
sensor hw/i2c: add asynchronous send 2022-06-30 09:21:14 +02:00
sh4 Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
smbios hw/smbios: Add table 4 parameter, "processor-id" 2022-03-06 05:28:55 -05:00
sparc machine: make memory-backend a link property 2022-05-12 12:29:44 +02:00
sparc64 hw: Reuse TYPE_I8042 define 2022-06-11 11:44:50 +02:00
ssi aspeed/smc: Fix potential overflow 2022-06-30 09:21:13 +02:00
timer Fix 'writeable' typos 2022-06-08 19:38:47 +01:00
tpm acpi: tpm-tis: use AcpiDevAmlIfClass:build_dev_aml to provide device's AML 2022-06-09 19:32:49 -04:00
tricore
usb hw: canokey: Remove HS support as not compliant to the spec 2022-07-01 12:39:51 +02:00
vfio ui/console: Do not return a value with ui_info 2022-06-14 10:34:37 +02:00
virtio virtio-iommu: Fix migration regression 2022-06-27 18:53:18 -04:00
watchdog ppc/spapr: Implement H_WATCHDOG 2022-07-06 10:22:38 -03:00
xen xen/pass-through: don't create needless register group 2022-07-05 14:19:48 +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