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Leonardo Bras b88651cb4d QIOChannel: Add flags on io_writev and introduce io_flush callback 
Add flags to io_writev and introduce io_flush as optional callback to
QIOChannelClass, allowing the implementation of zero copy writes by
subclasses.

How to use them:
- Write data using qio_channel_writev*(...,QIO_CHANNEL_WRITE_FLAG_ZERO_COPY),
- Wait write completion with qio_channel_flush().

Notes:
As some zero copy write implementations work asynchronously, it's
recommended to keep the write buffer untouched until the return of
qio_channel_flush(), to avoid the risk of sending an updated buffer
instead of the buffer state during write.

As io_flush callback is optional, if a subclass does not implement it, then:
- io_flush will return 0 without changing anything.

Also, some functions like qio_channel_writev_full_all() were adapted to
receive a flag parameter. That allows shared code between zero copy and
non-zero copy writev, and also an easier implementation on new flags.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20220513062836.965425-3-leobras@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
 		2022-05-16 13:56:24 +01:00
..
9pfs 9pfs: fix qemu_mknodat() to always return -1 on error on macOS host 2022-05-01 14:07:03 +02:00
acpi hw/acpi/aml-build: Use existing CPU topology to build PPTT table 2022-05-09 11:47:55 +01:00
adc aspeed/adc: Add AST1030 support 2022-05-02 17:03:02 +02:00
alpha Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
arm machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
audio pc: remove -soundhw pcspk 2022-05-07 07:46:59 +02:00
avr Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
block hw/block/fdc: Prevent end-of-track overrun (CVE-2021-3507) 2022-05-12 12:31:08 +02:00
char hw/char: fix qcode array bounds check in ESCC impl 2022-04-26 16:12:26 +01:00
core machine: move more memory validation to Machine object 2022-05-12 12:29:44 +02:00
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
display artist: only render dirty scanlines on the display surface 2022-05-08 18:52:37 +01:00
dma Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
gpio hw/gpio/aspeed_gpio: Fix QOM pin property 2022-05-02 17:03:04 +02:00
hppa machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
hyperv util: rename qemu_*block() socket functions 2022-05-03 15:53:20 +04:00
i2c Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
i386 machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
ide MIPS patches queue 2022-03-09 09:13:39 +00:00
input hw: replace qemu_set_nonblock() 2022-05-03 15:52:33 +04:00
intc ppc/xive: Update the state of the External interrupt signal 2022-05-05 15:36:17 -03:00
ipack qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
ipmi hw/isa: Inline and remove one-line isa_init_irq() 2022-03-08 19:38:17 +01:00
isa Warn user if the vga flag is passed but no vga device is created 2022-05-09 08:21:14 +02:00
m68k hw: Add compat machines for 7.1 2022-04-20 09:36:24 +02:00
mem Mark remaining global TypeInfo instances as const 2022-02-21 13:30:20 +00:00
microblaze Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
mips Warn user if the vga flag is passed but no vga device is created 2022-05-09 08:21:14 +02:00
misc lasi: move from hw/hppa to hw/misc 2022-05-08 18:52:37 +01:00
net Clean up header guards that don't match their file name 2022-05-11 16:49:06 +02:00
nios2 hw/nios2: Machine with a Vectored Interrupt Controller 2022-04-26 08:17:05 -07:00
nubus qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
nvme Clean up header guards that don't match their file name 2022-05-11 16:49:06 +02:00
nvram machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
openrisc hw/openrisc: use right OMPIC size variable 2022-05-15 10:33:01 +09:00
pci Warn user if the vga flag is passed but no vga device is created 2022-05-09 08:21:14 +02:00
pci-bridge pci: expose TYPE_XIO3130_DOWNSTREAM name 2022-03-06 05:08:23 -05:00
pci-host dino: move from hw/hppa to hw/pci-host 2022-05-08 18:52:36 +01:00
pcmcia hw/pcmcia: Do not register PCMCIA type if not required 2021-05-02 17:24:50 +02:00
ppc machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
rdma hw/pvrdma: Some cosmetic fixes 2022-04-26 12:25:14 +02:00
remote QIOChannel: Add flags on io_writev and introduce io_flush callback 2022-05-16 13:56:24 +01:00
riscv hw/riscv: Enable TPM backends 2022-04-29 10:48:48 +10:00
rtc Replace qemu_gettimeofday() with g_get_real_time() 2022-04-06 10:50:37 +02:00
rx hw/rx: rx-gdbsim DTB load address aligned of 16byte. 2022-04-21 10:06:42 -07:00
s390x machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
scsi virtio-scsi: move request-related items from .h to .c 2022-05-09 10:45:04 +01:00
sd Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
sensor hw/sensor: add Renesas raa228000 device 2022-03-08 18:46:48 +01:00
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 machine: use QAPI struct for boot configuration 2022-05-12 12:29:43 +02:00
ssi aspeed/smc: Add AST1030 support 2022-05-02 17:03:03 +02:00
timer aspeed/timer: Add AST1030 support 2022-05-02 17:03:03 +02:00
tpm Replace qemu_real_host_page variables with inlined functions 2022-04-06 10:50:38 +02:00
tricore hw/tricore: fix inclusion of tricore_testboard 2021-07-20 20:10:21 +02:00
usb Clean up header guards that don't match their file name 2022-05-11 16:49:06 +02:00
vfio linux-headers: Update to v5.18-rc6 2022-05-13 08:20:11 -06:00
virtio vhost-backend: do not depend on CONFIG_VHOST_VSOCK 2022-05-12 12:29:44 +02:00
watchdog aspeed/wdt: Add AST1030 support 2022-05-02 17:03:03 +02:00
xen hw/xen/xen_pt: Resolve igd_passthrough_isa_bridge_create() indirection 2022-05-12 12:07:06 +02:00
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/arm: xlnx-zcu102: Add Xilinx eFUSE device 2021-09-30 13:42:10 +01:00
meson.build sensor: Move hardware sensors from misc to a sensor directory 2021-06-17 07:10:32 -05:00