[Qemu-devel] [RFC Patch 0/3]Qemu: Enable dynamic cache change through qemu monitor

[Supriya Kannery <supriyak@linux.vnet.ibm.com>]

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Currently cache setting of a block device cannot be changed without 
restarting a running VM. Following patchset is for enabling dynamic 
change of cache setting for block devices through qemu monitor. Code 
changes are based on patches from Christoph Hellwig and Prerna Saxena.

Monitor command "info block" is extended to display cache setting of 
block devices. New monitor command "cache_set" is added using which 
cache setting can be dynamically changed
Usage:
"cache_set <device> <cache>"
   <device> = block device      
   <cache> = "off"/"none", "on"/"writeback", "writethrough", "unsafe"
      
 1/3 Enhance "info block" to display cache setting
 2/3 New error classes for file reopen and device insertion
 3/3 Add monitor command "cache_set" for dynamic cache change

 qemu/block.c         |   71
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 qemu/block.h         |    2 +
 qemu/blockdev.c      |   20 +++++++++++++++++++
 qemu/blockdev.h      |    1
 qemu/hmp-commands.hx |   14 +++++++++++++
 qemu/qerror.c        |    8 +++++++
 qemu/qerror.h        |    6 +++++
 qemu/qmp-commands.hx |   28 ++++++++++++++++++++++++++
 8 files changed, 148 insertions(+), 2 deletions(-)

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