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| author | Pavel Butsykin <pbutsykin@virtuozzo.com> | 2017-09-19 15:07:33 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-09-21 11:51:49 +0200 |
| commit | 55289fb036481396466d7825fa01d829c891108c (patch) | |
| tree | 3a3913a0815b31982f08562fd1fefb3a4b01b509 /include | |
| parent | b62b7ed0fc9c58e373b8946c9bd2e193be98dae6 (diff) | |
| download | qemu-55289fb036481396466d7825fa01d829c891108c.zip qemu-55289fb036481396466d7825fa01d829c891108c.tar.gz qemu-55289fb036481396466d7825fa01d829c891108c.tar.bz2 | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/virtio/virtio-serial.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/hw/virtio/virtio-serial.h b/include/hw/virtio/virtio-serial.h index b19c447..12657a9 100644 --- a/include/hw/virtio/virtio-serial.h +++ b/include/hw/virtio/virtio-serial.h @@ -58,6 +58,9 @@ typedef struct VirtIOSerialPortClass { /* Guest opened/closed device. */ void (*set_guest_connected)(VirtIOSerialPort *port, int guest_connected); + /* Enable/disable backend for virtio serial port */ + void (*enable_backend)(VirtIOSerialPort *port, bool enable); + /* Guest is now ready to accept data (virtqueues set up). */ void (*guest_ready)(VirtIOSerialPort *port); |