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55289fb036
qemu/hw/char
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Pavel Butsykin 55289fb036 virtio-serial: add enable_backend callback 
We should guarantee that RAM will not be modified while VM has a stopped
state, otherwise it can lead to negative consequences during post-copy
migration. In RUN_STATE_FINISH_MIGRATE step, it's expected that RAM on
source side will not be modified as this could lead to non-consistent vm state
on the destination side. Also RAM access during postcopy-ram migration with
enabled release-ram capability can lead to sad consequences.

Let's add enable_backend() callback to avoid undesirable virtioqueue changes
in the guest memory.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Message-Id: <20170919120733.22020-1-pbutsykin@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-09-21 11:51:49 +02:00
..
bcm2835_aux.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
cadence_uart.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
cmsdk-apb-uart.c hw/arm/mps2: Add UARTs 2017-07-17 13:36:08 +01:00
debugcon.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
digic-uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
escc.c qapi: Mechanically convert FOO_lookup[...] to FOO_str(...) 2017-09-04 13:09:13 +02:00
etraxfs_ser.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
exynos4210_uart.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
grlib_apbuart.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
imx_serial.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
ipoctal232.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
lm32_juart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
lm32_uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
Makefile.objs hw/char/cmsdk-apb-uart.c: Implement CMSDK APB UART 2017-07-17 13:36:08 +01:00
mcf_uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
milkymist-uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
omap_uart.c chardev: move headers to include/chardev 2017-06-02 11:33:52 +04:00
parallel.c chardev: fix parallel device can't be reconnect 2017-07-14 12:04:41 +02:00
pl011.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
sclpconsole-lm.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
sclpconsole.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
serial-isa.c char: rename CharDriverState Chardev 2017-01-27 18:07:59 +01:00
serial-pci.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
serial.c serial: chardev hotswap support 2017-07-14 11:04:34 +02:00
sh_serial.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
spapr_vty.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
stm32f2xx_usart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
terminal3270.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
virtio-console.c virtio-serial: add enable_backend callback 2017-09-21 11:51:49 +02:00
virtio-serial-bus.c virtio-serial: add enable_backend callback 2017-09-21 11:51:49 +02:00
xen_console.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
xilinx_uartlite.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00