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virtio-serial: add enable_backend callback

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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>
This commit is contained in:
Pavel Butsykin 2017-09-19 15:07:33 +03:00 • committed by Paolo Bonzini
parent b62b7ed0fc
commit 55289fb036
3 changed files with 31 additions and 0 deletions
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3
include/hw/virtio/virtio-serial.h
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@ -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);