On 26.02.2020 13:19, Roger Pau Monne wrote: > Add helpers to track when running in NMI handler context. This is > modeled after the in_irq helpers. > > The SDM states that no NMI can be delivered while handling a NMI > until the processor has executed an iret instruction. It's possible > however that another fault is received while handling the NMI (a #MC > for example), and thus the iret from that fault would allow further > NMIs to be injected while still processing the previous one, and > hence an integer is needed in order to keep track of in service NMIs. > The added macros only track when the execution context is in the NMI > handler, but that doesn't mean NMIs are blocked for the reasons listed > above. > > Note that there are no users of in_nmi_handler() introduced by the > change, further users will be added by followup changes. > > Signed-off-by: Roger Pau Monné <roger....@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
