Re: [Xen-devel] [PATCH v4 4/5] libxl: update vcpus bitmap in retrieved guest config

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 11, 2016 at 04:56:02PM +0100, Ian Jackson wrote:
> Wei Liu writes ("[PATCH v4 4/5] libxl: update vcpus bitmap in retrieved guest 
> config"):
> > ... because the available vcpu bitmap can change during domain life time
> > due to cpu hotplug and unplug.
> > 
> > For QEMU upstream, we interrogate QEMU for the number of vcpus. For
> > others, we look directly into xenstore for information.
> > 
> > Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
> > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

Sorry I just realise there is one hunk I forgot to commit.

The hunk is (on top of this patch) to use libxl__xs_read_checked

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index e4b0424..e49741d 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -7305,8 +7305,10 @@ static int libxl__update_avail_vcpus_xenstore(libxl__gc 
*gc, uint32_t domid,
 
     for (i = 0; i < max_vcpus; i++) {
         const char *path = GCSPRINTF("%s/cpu/%u/availability", dompath, i);
-        const char *content = libxl__xs_read(gc, XBT_NULL, path);
-        if (!strcmp(content, "online"))
+        const char *content;
+        rc = libxl__xs_read_checked(gc, XBT_NULL, path, &content);
+        if (rc) goto out;
+        if (content && !strcmp(content, "online"))
             libxl_bitmap_set(map, i);
     }
 
Is it ok to keep your ack?

Wei.

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