* zach@xxxxxxxxxx (zach@xxxxxxxxxx) wrote: > i386 Transparent paravirtualization patch #1. > > Add support for interrupt holdoff to the entry.S fault and syscall paths. This > is a straightforward macro-ization for the default sub-architecture. Note that > CLI, STI and IRET may be called with non-flat segments because guest %ds and > %es segments are live at the time. Any alternative implementation (such as a > virtual interrupt mask) is required to be compatible with this requirement. Could you please elaborate on this one. I'd like to make sure I understand (since Xen uses some type of virtual interrupt mask to disable event channel). > This makes maintenance of the code in entry.S much more easy, and eliminates > some very tricky code changes that would otherwise be required. CLI/STI/IRET > may all assume a 32 bit flat stack for writing to data areas. > > STI_SYSEXIT is macroized together because it implicitly relies on the interrupt > holdoff property of STI. I'm also unclear on this bit. thanks, -chris
