* [PATCH v2] libxl: correct xenstore entry for empty cdrom
@ 2017-02-15 11:11 Juergen Gross
2017-02-16 13:01 ` Wei Liu
0 siblings, 1 reply; 2+ messages in thread
From: Juergen Gross @ 2017-02-15 11:11 UTC (permalink / raw)
To: xen-devel; +Cc: Juergen Gross, wei.liu2, ian.jackson
Specifying an empty cdrom device will result in a Xenstore entry
params = aio:(null)
as the physical device path isn't existing. This lets a domain booted
via OVMF hang as OVMF is checking for "aio:" only in order to detect
the empty cdrom case.
Use an empty string for the physical device path in this case. As a
cdrom device for HVM is always backed by qdisk we only need to cover this
backend.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
This is a backport candidate.
V2: rebase to staging
---
tools/libxl/libxl_disk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/libxl/libxl_disk.c b/tools/libxl/libxl_disk.c
index ac49df2..63de75c 100644
--- a/tools/libxl/libxl_disk.c
+++ b/tools/libxl/libxl_disk.c
@@ -359,7 +359,8 @@ static void device_disk_add(libxl__egc *egc, uint32_t domid,
case LIBXL_DISK_BACKEND_QDISK:
flexarray_append(back, "params");
flexarray_append(back, GCSPRINTF("%s:%s",
- libxl__device_disk_string_of_format(disk->format), disk->pdev_path));
+ libxl__device_disk_string_of_format(disk->format),
+ disk->pdev_path ? : ""));
if (libxl_defbool_val(disk->colo_enable)) {
flexarray_append(back, "colo-host");
flexarray_append(back, libxl__sprintf(gc, "%s", disk->colo_host));
--
2.10.2
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] libxl: correct xenstore entry for empty cdrom
2017-02-15 11:11 [PATCH v2] libxl: correct xenstore entry for empty cdrom Juergen Gross
@ 2017-02-16 13:01 ` Wei Liu
0 siblings, 0 replies; 2+ messages in thread
From: Wei Liu @ 2017-02-16 13:01 UTC (permalink / raw)
To: Juergen Gross; +Cc: xen-devel, ian.jackson, wei.liu2
On Wed, Feb 15, 2017 at 12:11:12PM +0100, Juergen Gross wrote:
> Specifying an empty cdrom device will result in a Xenstore entry
>
> params = aio:(null)
>
> as the physical device path isn't existing. This lets a domain booted
> via OVMF hang as OVMF is checking for "aio:" only in order to detect
> the empty cdrom case.
>
> Use an empty string for the physical device path in this case. As a
> cdrom device for HVM is always backed by qdisk we only need to cover this
> backend.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
Acked + applied
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