Re: [Xen-devel] [PATCH] tools/xenstore: don't apply write limiting for privileged domain

[Wei Liu <wl@xen.org>]

On Fri, Jan 31, 2020 at 02:55:44PM +0000, Wei Liu wrote:
> On Fri, Jan 31, 2020 at 03:25:57PM +0100, Juergen Gross wrote:
> > Xenstore write limiting should not be applied to dom0. Unfortunately
> > write limiting is disabled only for connections via sockets. When
> > running in a stubdom Xenstore will apply write limiting to dom0, too.
> > Change that by testing for the domain to be privileged as well.
> > 
> > Signed-off-by: Juergen Gross <jgross@suse.com>
> 
> Acked-by: Wei Liu <wl@xen.org>
> 
> > ---
> >  tools/xenstore/xenstored_domain.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/xenstore/xenstored_domain.c b/tools/xenstore/xenstored_domain.c
> > index 1a83097952..c7c6c574df 100644
> > --- a/tools/xenstore/xenstored_domain.c
> > +++ b/tools/xenstore/xenstored_domain.c
> > @@ -918,8 +918,8 @@ void wrl_apply_debit_actual(struct domain *domain)
> >  {
> >  	struct wrl_timestampt now;
> >  
> > -	if (!domain)
> > -		/* sockets escape the write rate limit */
> > +	if (!domain || !domid_is_unprivileged(domain->domid))
> > +		/* sockets and dom0 escape the write rate limit */

Actually I think changing dom0 to "privileged domain" makes more sense
here because you're allowed to specify a non-0 domain ID as privileged
domid.

If you agree I can fix it while committing.

Wei.

> >  		return;
> >  
> >  	wrl_gettime_now(&now);
> > -- 
> > 2.16.4
> > 

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