Re: [Xen-devel] [PATCH] libxl: create control/sysrq xenstore node

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Sep 04, 2018 at 01:39:29PM +0200, Vitaly Kuznetsov wrote:
> 'xl sysrq' command doesn't work with modern Linux guests with the following
> message in guest's log:
> 
>  xen:manage: sysrq_handler: Error -13 writing sysrq in control/sysrq
> 
> xenstore trace confirms:
> 
>  IN 0x24bd9a0 20180904 04:36:32 WRITE (control/sysrq )
>  OUT 0x24bd9a0 20180904 04:36:32 ERROR (EACCES )
> 
> The problem seems to be in the fact that we don't pre-create control/sysrq
> xenstore node and libxl_send_sysrq() doing libxl__xs_printf() creates it as
> read-only. As we want to allow guests to clean 'control/sysrq' after the
> requested action is performed, we need to make this node writable.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

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

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