Re: [Xen-devel] [PATCH for-4.10] xen/dom0: Fix latent dom0 construction bugs on all architectures

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Oct 16, 2017 at 03:38:03PM +0100, Andrew Cooper wrote:
>  * x86 PV and ARM dom0's must not clear _VPF_down from v->pause_flags until
>    all state is actually set up.  As it currently stands, d0v0 is eligible for
>    scheduling before its registers have been set.  This is latent as we also
>    hold a systemcontroller pause reference at the time which prevents d0 from
>    being scheduled.
> 
>  * x86 PVH dom0's must set v->is_initialised on d0v0, to prevent another vcpu
>    being able to call VCPUOP_initialise and modify state under the feet of the
>    running vcpu.  This is latent as PVH dom0 construction don't yet function.
> 

While I think this patch is a good idea, the above paragraph confuses
me: I did boot PVH Dom0 at one point so it did function; I also never
triggered a bug like the one described here.

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