Re: [Xen-devel] [PATCH v2 2/2] tools: utility to dump guest grant table info

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 03, 2017 at 07:34:13AM +0800, Dongli Zhang wrote:
> As both xen-netfront and xen-blkfront support multi-queue, they would
> consume a lot of grant table references when there are many paravirtual
> devices and vcpus assigned to guest. Guest domU might panic or hang due to
> grant allocation failure when nr_grant_frames in guest has reached its max
> value.
> 
> This utility would help the administrators to diagnose xen issue. There is
> only one command gnttab_query_size so far to monitor the guest grant table
> frame usage on dom0 side so that it is not required to debug on guest
> kernel side for crash/hang analysis anymore.
> 
> It is extensible for adding new commands for more diagnostic functions and
> the framework of xen-diag.c is from xen-livepatch.c.
> 
> Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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