On Fri, Apr 10, 2015 at 17:03:26, Andrew Cooper wrote: > Are you perhaps looking for something similar to Intel #VE support? Yes, in that we want a way to notify a guest that it has made an access that violated a stage-2 / EPT permission. However, for our purposes a trap into the hypervisor followed by injection of a virtual interrupt into the guest is acceptable; we don't require the interrupt to be directly delivered to the guest.
> (although I guess you are looking at ARM rather than x86) Yes, my email address is a giveaway ;) > It is not safe to always re-inject back into the vcpu, especially if > the permission changes were around the guest kernel stack, but a > restricted subset ought to be safe to bounce straight in. The permission changes will be applied only to DMA buffers, rather than to anything the guest kernel itself needs to touch - so should be safe to directly re-inject. -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
