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[Qemu-devel] KVM Forum 2012 Block BoF minutes
From: |
Markus Armbruster |
Subject: |
[Qemu-devel] KVM Forum 2012 Block BoF minutes |
Date: |
Thu, 15 Nov 2012 14:31:53 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) |
Attendees:
Kevin Wolf <address@hidden>
Stefan Hajnoczi <address@hidden>
Jeff Cody <address@hidden>
Markus Armbruster <address@hidden>
and a few people dropping in and out.
Minutes are basically a TODO list. Could be a bit terse in places; if
anything's unclear, please ask.
Block layer data structure cleanup:
- Split block backend off BlockDriverState
- Turn block backend into a proper ADT (besides other good things, this
makes it possible to replace its implementation by a test harness for
unit testing of its customers)
- Get rid of BlockDriverState opaque (driver private state), inherit the
common part into driver state
Convert open to QemuOpts (or perhaps QDict?)
Avoid double open for probing (update: patches posted)
Block jobs:
- Rate limiting is broken in general (it works for the single
BlockDriverState case)
- Block jobs should be jobs: generally available instead of tied to a
(single) BlockDriverState; get rid of the block job pointer in
BlockDriverState
- Migration should probably be a job
Block migration needs to die after its replacement is ready
BlockDriverState member in_use and DriveInfo member refcount are a mess:
- in_use is used to avoid running certain things concurrently, but the
rules are unclear, except they're clearly incomplete; possible rules
could be about need for consistent views of image contents
- refcount is only used together with in_use, and appears to be for
avoiding premature deletion
AHCI:
- Same IDE device models connect to different kinds of controllers just
fine
- Use links to connect controller device model and drive device models;
the link serves as generic address replacing bus, unit, index
- Make -drive if!=none true sugar for suitable -device (details depend
on machine)
- Checking legacy bus, unit, index needs to be delayed until machine's
limits are known
- Add "enough" -hdX to cover common usage (got 4 now, want 6 for q35)
- Some AHCI controllers can optionally mimick a legacy IDE controller,
and expose some of their ports there (controlled by BIOS for real
hardware, by controller qdev property for us)
- Convenience machine option to control that qdev property of an onboard
controller would be nice (should not apply to additional controllers
plugged in with -device)
- if=ahci is not necessary
- [Qemu-devel] KVM Forum 2012 Block BoF minutes,
Markus Armbruster <=