Hello Jan, On 18.07.19 14:10, Jan Beulich wrote:
A concrete scenario where update_runstate_area() and vcpu_runstate_change() can actually race would be very worthwhile to point out here. In particular on Arm I'm not (yet?) seeing how this could happen.
The scenario is quite trivial: some vcpu uptdating its runstate values (e.g. context switching) while those values are being read by a guest using other vcpu.
Considering the value of XEN_RUNSTATE_UPDATE it must be a rather rare race anyway, I would guess.
I'm not sure how do you link the value of XEN_RUNSTATE_UPDATE and the issue occurrence rate. Could you please provide more details about the idea? -- Sincerely, Andrii Anisov. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
