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Add cache=unsafe parameter to -drive

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Usually the guest can tell the host to flush data to disk. In some cases we
don't want to flush though, but try to keep everything in cache.

So let's add a new cache value to -drive that allows us to set the cache
policy to most aggressive, disabling flushes. We call this mode "unsafe",
as guest data is not guaranteed to survive host crashes anymore.

This patch also adds a noop function for aio, so we can do nothing in AIO
fashion.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Alexander Graf 2010-05-26 17:51:49 +02:00 • committed by Aurelien Jarno
parent d467b679f2
commit 016f5cf6ff
5 changed files with 44 additions and 4 deletions
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2
qemu-config.c
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@ -54,7 +54,7 @@ QemuOptsList qemu_drive_opts = {
},{
.name = "cache",
.type = QEMU_OPT_STRING,
.help = "host cache usage (none, writeback, writethrough)",
.help = "host cache usage (none, writeback, writethrough, unsafe)",
},{
.name = "aio",
.type = QEMU_OPT_STRING,