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[Qemu-devel] [V5 Patch 0/4]Qemu: Set host cache from cmdline and monitor
From: |
Supriya Kannery |
Subject: |
[Qemu-devel] [V5 Patch 0/4]Qemu: Set host cache from cmdline and monitor |
Date: |
Wed, 27 Jul 2011 17:00:00 +0530 |
Currently cache setting of a block device cannot be changed
without restarting a running VM. Following patchset is for
enabling dynamic change of host cache setting for block devices
through qemu monitor. Code changes are based on patches
from Christoph Hellwig and Prerna Saxena.
This patchset introduces monitor command 'block_set'
using which various parameters for block devices can be
changed dynamically. Dynamic changing of host cache
setting is implemented for now. This patchset also
introduces 'hostcache', a new option for setting host
cache from qemu command line. 'Hostcache and 'cache' options
cannot be used simultaneously from commandline.
Changes from patchset V4:
1. Defined a new qerror class for incorrect command
syntax.
2. Changed some of the error_report() calls to
qerror_report() calls
New block command added:
"block_set"
-- Sets block device parameters while guest is running.
Usage:
block_set <device> <param> <value>
<device> = block device
<param> = parameter (say, "hostcache")
<value> = on/off
New 'hostcache' option added to -drive:
-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
....
" [,readonly=on|off][,hostcache=on|off]\n"
1/4 Enhance "info block" to display hostcache setting
2/4 New qerrors for file reopen, data sync and command syntax
3/4 Command "block_set" for dynamic params change for block device
4/4 'hostcache' option added to -drive in qemu commandline
qemu/block.c | 75 +++++++++++++++++++++++++++++++++++++++++++++
qemu/block.h | 2 +
qemu/blockdev.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
qemu/blockdev.h | 1
qemu/hmp-commands.hx | 14 +++++++++++
qemu/qemu-config.c | 17 ++++++++++
qemu/qemu-option.c | 25 ++++++++++++++++++++
qemu/qemu-option.h | 2 +
qemu/qemu-options.hx | 2 -
qemu/qerror.c | 12 ++++++++++
qemu/qerror.h | 8 ++++++
qemu/qmp-commands.hx | 30 +++++++++++++++++++++++
12 files changed, 257 insertions(+), 2 deletions(-)
~
- [Qemu-devel] [V5 Patch 0/4]Qemu: Set host cache from cmdline and monitor,
Supriya Kannery <=