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| author |   Yoann Desmouceaux <ydesmouc@cisco.com> | 2016-02-24 22:51:00 +0100 |
|---|---|---|
| committer |   Gerrit Code Review <gerrit@fd.io> | 2016-02-25 13:53:14 +0000 |
| commit | 4667c229a05458eb7558cf927a44df3d5f585c11 (patch) | |
| tree | d2fac70af78c9948aa302546d9512a149a45e87b /gmod | |
| parent | 1f49ed666af8b9cb889f9ea61f084341d0b6c4f4 (diff) | |
Add live migration support to (non-dpdk) vhost-user driver
This patch adds live migration support to vhost interfaces, by supporting the VHOST_F_LOG_ALL feature. When qemu starts a migration, it will negotiate this feature, and provide a fd for a "dirty log" shared mem space. This log is a bitmap representing pages in the device memory.
Whenever we touch memory pointed by a "desc" vring, or modify a "used" vring, we log the corresponding page in the bitmap. This allows qemu to send the dirty page to the destination host.
See https://github.com/qemu/qemu/blob/master/docs/specs/vhost-user.txt, ยง "Live migration" for more details.
In addition to this, this code provides support for the VHOST_USER_F_PROTOCOL_FEATURES feature, and to VHOST_USER_{GET,SET}_PROTOCOL_FEATURES and VHOST_USER_SET_VRING_ENABLE messages, required for live migration.
Change-Id: I7577efce8bd67653218f4291af1d651de451e552
Signed-off-by: Yoann Desmouceaux <ydesmouc@cisco.com>
Diffstat (limited to 'gmod')
0 files changed, 0 insertions, 0 deletions