Re: [PATCH v3] tools/xenstore: don't store domU's mfn of ring page in xenstored

[Wei Liu <wl@xxxxxxx>]

On Thu, Apr 30, 2020 at 07:38:42AM +0200, Juergen Gross wrote:
> The XS_INTRODUCE command has two parameters: the mfn (or better: gfn)
> of the domain's xenstore ring page and the event channel of the
> domain for communicating with Xenstore.
> 
> The gfn is not really needed. It is stored in the per-domain struct
> in xenstored and in case of another XS_INTRODUCE for the domain it
> is tested to match the original value. If it doesn't match the
> command is aborted via EINVAL, otherwise the event channel to the
> domain is recreated.
> 
> As XS_INTRODUCE is limited to dom0 and there is no real downside of
> recreating the event channel just omit the test for the gfn to
> match and don't return EINVAL for multiple XS_INTRODUCE calls.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Acked-by: Wei Liu <wl@xxxxxxx>