[Xen-devel] [PATCH] libxl: No emulated disk driver for xvdX disk

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

When a guest configuration list xvdX for its disks, there is no need to
provide an emulated driver for the same target.

Such configuration can work with the OVMF firmware, as it supports PV
disk.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libxl/libxl_dm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 71a1a3e..5371f72 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1190,6 +1190,12 @@ static int libxl__build_device_model_args_new(libxl__gc 
*gc,
                     drive = libxl__sprintf
                         (gc, 
"file=%s,if=scsi,bus=0,unit=%d,format=%s,cache=writeback",
                          pdev_path, disk, format);
+                else if (strncmp(disks[i].vdev, "xvd", 3) == 0)
+                    /*
+                     * Do not add any emulated disk when PV disk are
+                     * explicitly asked for.
+                     */
+                    continue;
                 else if (disk < 6 && b_info->u.hvm.hdtype == 
LIBXL_HDTYPE_AHCI) {
                     flexarray_vappend(dm_args, "-drive",
                         
GCSPRINTF("file=%s,if=none,id=ahcidisk-%d,format=%s,cache=writeback",
-- 
Anthony PERARD


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