* Zachary Amsden (zach@xxxxxxxxxx) wrote: > These changes are sufficient to glue the Linux low level entry points to > hypervisor event injection by emulating the native processor exception > frame interface. There's a bit more going on in the Xen changes to entry.S. The STI/CLI abstraction definitely gets partway there. Then there's some bits that use (in your terms) __STI, __CLI. It's in code that's a pure addition so it's tempting to simply make a mechanism for the additions, but it's a bit too intertwined to just separate that code, as there's calls from core entry.S into the Xen additions. > N.B. Sti; Sysexit is a required abstraction, as the STI instruction implies > holdoff of interrupts, which is destroyed by any NOP padding. Or just disable systenter ;-) Random question...do you support systenter? Sounds slower than int80, since it should require 3->0->1->0->3 transitions. Just idly curious if you've done benchmarks to see the difference. thanks, -chris
