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With this change, when the VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS protocol feature has been negotiated, Qemu no longer sends the backend all the memory regions in a single message. Rather, when the memory tables are set or updated, a series of VHOST_USER_ADD_MEM_REG and VHOST_USER_REM_MEM_REG messages are sent to transmit the regions to map and/or unmap instead of sending send all the regions in one fixed size VHOST_USER_SET_MEM_TABLE message. The vhost_user struct maintains a shadow state of the VM’s memory regions. When the memory tables are modified, the vhost_user_set_mem_table() function compares the new device memory state to the shadow state and only sends regions which need to be unmapped or mapped in. The regions which must be unmapped are sent first, followed by the new regions to be mapped in. After all the messages have been sent, the shadow state is set to the current virtual device state. Existing backends which do not support VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS are unaffected. Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com> Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com> Suggested-by: Mike Cui <cui@nutanix.com> Message-Id: <1588533678-23450-5-git-send-email-raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com> |
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| .. | ||
| bitmaps.rst | ||
| conf.py | ||
| dbus-vmstate.rst | ||
| dbus.rst | ||
| firmware.json | ||
| index.rst | ||
| live-block-operations.rst | ||
| nbd.txt | ||
| parallels.txt | ||
| pr-helper.rst | ||
| prl-xml.txt | ||
| qcow2.txt | ||
| qed_spec.txt | ||
| qemu-ga-ref.texi | ||
| qemu-ga.rst | ||
| qemu-qmp-ref.texi | ||
| qmp-intro.txt | ||
| qmp-spec.txt | ||
| vhost-user-gpu.rst | ||
| vhost-user.json | ||
| vhost-user.rst | ||
| vnc-ledstate-Pseudo-encoding.txt | ||