On Wednesday 22 March 2006 18:51, Zachary Amsden wrote: > > Yes, trapping works fine. Even LLDT is infrequent. Not when you use old style LinuxThreads which use the LDT for TLS. > No. First, you have to create a special #GP handler for the general > protection fault. [... etc ...] Sure but Xen already has the infrastructure for all of this and last time I checked it was approaching and exceeding the size of the main core kernel so a bit more of instruction emulation probably wouldn't do too much harm. In general I think any x86 hypervisor that attempts to work on current platforms needs instruction emulation because it is the only way to virtualize IO devices. If this was supposed to be a interface for lots of hypervisors then maybe, but so far it seems to only cover Xen and possibly some other bloatware ones. That said I don't feel very strongly about emulating these instructions or not as long as they can do that without too much code duplication. The current patch are still a bit too excessive on the duplication front. -Andi
