Re: [Qemu-devel] [PATCH v3 3/3] seccomp: set the seccomp filter to all threads

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Aug 22, 2018 at 06:39:52PM +0200, Marc-André Lureau wrote:
> Hi
> 
> On Wed, Aug 22, 2018 at 6:37 PM Marc-André Lureau
> <marcandre.lureau@gmail.com> wrote:
> >
> > Hi
> >
> > On Wed, Aug 22, 2018 at 6:08 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > > We would have to make libvirt probe for tsync support too, because it
> > > now unconditionally uses -sandbox for new enough QEMU.
> >
> > sigh :( that's where the -sandbox tsync option could have been helpful
> > keeping the compatibility.
> 
> So what can libvirt do if tsync is not available?

It depends how libvirt is configured. If /etc/libvirt/qemu.conf has
seccomp=1, then we'd  blindly start QEMU and expect QEMU to fail
because -sandbox can't be usefully enforced. If qemu.conf has "seccomp"
unset, then we'd simply not use -sandbox flag for any guests.

Regards,
Daniel
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