From 016f5cf6ff465411733878a17c8f8febb7668321 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Wed, 26 May 2010 17:51:49 +0200 Subject: Add cache=unsafe parameter to -drive 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 Signed-off-by: Aurelien Jarno --- vl.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'vl.c') diff --git a/vl.c b/vl.c index 328395e3dd..bc15dd74af 100644 --- a/vl.c +++ b/vl.c @@ -913,6 +913,9 @@ DriveInfo *drive_init(QemuOpts *opts, void *opaque, bdrv_flags |= BDRV_O_NOCACHE; } else if (!strcmp(buf, "writeback")) { bdrv_flags |= BDRV_O_CACHE_WB; + } else if (!strcmp(buf, "unsafe")) { + bdrv_flags |= BDRV_O_CACHE_WB; + bdrv_flags |= BDRV_O_NO_FLUSH; } else if (!strcmp(buf, "writethrough")) { /* this is the default */ } else { -- cgit v1.2.3