aboutsummaryrefslogtreecommitdiff
path: root/qemu-options.hx
diff options
context:
space:
mode:
authorAlex Bennée <alex.bennee@linaro.org>2022-08-22 17:56:08 +0100
committerAlex Bennée <alex.bennee@linaro.org>2022-08-24 10:14:49 +0100
commit5af2b0f6eace7b368ed5cad9677e3bc995b6a7e3 (patch)
tree6cf5946e646341898195c6ff60939b0c1bc3b0ef /qemu-options.hx
parent00269477c2184393d23865a089a3d71b03ef3d17 (diff)
qemu-options: try and clarify preferred block semantics
Try to correct any confusion about QEMU's Byzantine disk options by laying out the preferred "modern" options as-per: "<danpb> (best: -device + -blockdev, 2nd obsolete syntax: -device + -drive, 3rd obsolete syntax: -drive, 4th obsolete syntax: -hdNN)" Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Acked-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Cc: qemu-block@nongnu.org Cc: Kevin Wolf <kwolf@redhat.com> Cc: Hanna Reitz <hreitz@redhat.com> Cc: Thomas Huth <thuth@redhat.com> Message-Id: <20220822165608.2980552-7-alex.bennee@linaro.org>
Diffstat (limited to 'qemu-options.hx')
-rw-r--r--qemu-options.hx13
1 files changed, 13 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx
index 3f23a42fa8..31c04f7eea 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1105,6 +1105,19 @@ DEFHEADING()
DEFHEADING(Block device options:)
+SRST
+The QEMU block device handling options have a long history and
+have gone through several iterations as the feature set and complexity
+of the block layer have grown. Many online guides to QEMU often
+reference older and deprecated options, which can lead to confusion.
+
+The recommended modern way to describe disks is to use a combination of
+``-device`` to specify the hardware device and ``-blockdev`` to
+describe the backend. The device defines what the guest sees and the
+backend describes how QEMU handles the data.
+
+ERST
+
DEF("fda", HAS_ARG, QEMU_OPTION_fda,
"-fda/-fdb file use 'file' as floppy disk 0/1 image\n", QEMU_ARCH_ALL)
DEF("fdb", HAS_ARG, QEMU_OPTION_fdb, "", QEMU_ARCH_ALL)