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Re: [libvirt] [PATCH] libxl: fix disk detach when <driver> not specified

On 02/07/2017 03:26 AM, Michal Privoznik wrote:
On 02/06/2017 11:08 PM, Jim Fehlig wrote:
When a user does not explicitly set a <driver> in the disk config,
libvirt defers selection of a default to libxl. This approach works
fine when starting a domain with such configuration or attaching a
disk to a running domain. But when detaching such a disk, libxl
will fail with "unrecognized disk backend type: 0". libxl makes no
attempt to recalculate a default backend (driver) on detach and
simply fails when uninitialized.

This patch updates the libvirt disk config with the backend selected
by libxl when starting a domain or attaching a disk to a running
domain. Another benefit of this approach is that the live XML is
also updated with the backend driver selected by libxl.

Signed-off-by: Jim Fehlig <jfehlig suse com>
 src/libxl/libxl_conf.c   | 33 +++++++++++++++++++++++++++++++++
 src/libxl/libxl_conf.h   |  4 ++++
 src/libxl/libxl_domain.c | 25 +++++++++++++++++++++++++
 src/libxl/libxl_driver.c |  2 +-
 4 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index b5186f2..6ef7570 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -851,6 +851,7 @@ libxlMakeDisk(virDomainDiskDefPtr l_disk, libxl_device_disk *x_disk)
          * xl-disk-configuration.txt in the xen documentation and let
          * libxl pick a suitable backend.
+        virDomainDiskSetFormat(l_disk, VIR_STORAGE_FILE_RAW);
         x_disk->format = LIBXL_DISK_FORMAT_RAW;
         x_disk->backend = LIBXL_DISK_BACKEND_UNKNOWN;

This doesn't feel right. I know what do you want it here for, but this
function is meant to take 'const' disk definition and translate it to
libxl definition. Although, I don't have a better suggestion where to
put it.

How about in the UpdateDisk function introduced in this patch? E.g. update it to raw if current format is VIR_STORAGE_FILE_NONE?


@@ -913,6 +914,38 @@ libxlMakeDiskList(virDomainDefPtr def, libxl_domain_config *d_config)
     return -1;

The rest looks okay. ACK.


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