Re: [Xen-devel] [PATCH v3 2/2] xen: add update indicator to vcpu_runstate_info

[Julien Grall <julien.grall@xxxxxxx>]

Hi Juergen,

On 17/06/16 06:26, Juergen Gross wrote:
> In order to support reading another vcpu's mapped vcpu_runstate_info
> an indicator for an occurring update of the runstate information is
> needed.
>
> Add the possibility to activate setting this indicator in the highest
> bit of state_entry_time via a vm_assist hypercall. When activated the
> update indicator will be set before the runstate information is
> modified in guest memory and it will be reset after modification is
> done. As state_entry_time is guaranteed to be different after each
> update the guest can detect any update (either in progress or while
> reading the runstate data) by comparing state_entry_time before and
> after reading runstate data: in case the values differ or the update
> indicator was set the data might be inconsistent and should be reread.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
For the ARM bits:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

Regards,

--
Julien Grall

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel