At 16:22 +0100 on 04 Jun (1433434934), David Vrabel wrote: > On 04/06/15 15:11, Tim Deegan wrote: > > > > There has been talk before of an operation along the lines of "revoke > > this grant entry and wait for all users to release it" but that would > > only help with backends that are guaranteed to release grants in a > > reasonable time. > > Are you talking about my idea? This would be immediate because the grant > mapper would provide a local page to atomically switch the foreign > mapping to when the grant is revoked.
That's a stronger operation than I remembered, and similar to what's happening here. If this reset operation is to be called from the guest, then all the guest can do is reshuffle its own memory -- it can't expect to have enough spare memory to cover all outstanding granted pages. But TBH this is a bit of a red herring; I ought not to have mentioned it. :) Tim. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
