Option to use alternative disk driver instead of default virtio

For example, to use scsi instead of virtio on the disk HDB, create an
environment variable named HDB_DRIVER and set it to scsi. You can set
this variable for any disk by changing the variable name (e.g.
HDA_DRIVER, HDC_DRIVER, etc.) to correspond to the disk for which you
want the driver set.

If you are using an SSD card and you want the fstrim command available,
set the driver to scsi. The value can be any value supported by kvm.

1 files changed, 6 insertions, 2 deletions

diff --git a/kvm-manager b/kvm-manager
index c4bfccb..a46f26a 100755
--- a/kvm-manager
+++ b/kvm-manager
@@ -136,14 +136,18 @@ up() {
     # set up the disks, if needed:
     if [ -n "$HDA" ]; then
        build_disk_io_params HDA
-       KVMARGS="$KVMARGS -drive file=$HDA,if=virtio,cache=none,index=$index,format=raw${first_disk_extra_args}${disk_io_params}"
+       driver=${HDA_DRIVER:-virtio}
+       KVMARGS="$KVMARGS -drive file=$HDA,if=$driver,cache=none,index=$index,format=raw${first_disk_extra_args}${disk_io_params}"
     fi
     # loop here on everything after HDA:
     for disk in HD{B..Z}; do
       index=$(( $index + 1 ))
       if [ -b "${!disk}" ]; then
+        driver=virtio
+        driver_var_name="${disk}_DRIVER"
+        [ -n "${!driver_var_name}" ] && driver=${!driver_var_name}
         build_disk_io_params "${disk}"
-        KVMARGS="$KVMARGS -drive file=${!disk},if=virtio,cache=none,index=$index,format=raw${disk_io_params}"
+        KVMARGS="$KVMARGS -drive file=${!disk},if=$driver,cache=none,index=$index,format=raw${disk_io_params}"
       fi
     done