Gleb Natapov wrote: > On Mon, Mar 30, 2009 at 06:04:45PM +0200, Jan Kiszka wrote: >> Gleb Natapov wrote: >>> The patch fixes two problems with task switching. >>> 1. Back link is written to a wrong TSS. >>> 2. Instruction emulation is not needed if the reason for task switch >>> is a task gate in IDT and access to it is caused by an external even. >>> >>> 2 is currently solved only for VMX since there is not reliable way to >>> skip an instruction in SVM. We should emulate it instead. >> Does this series fix all issues Bernhard, Thomas and Julian stumbled over? >> > Haven't tried. I wrote my own tests for task switching. How can I check it? > There is a test case attached to Julian's sourceforge-reported bug: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2681442&group_id=180599 And I guess Thomas or Bernhard will be happy to give it a try, too... :) There was one issue, the IRQ injection bug [1] which was related to IRQ tasks IIRC. Thomas and I finally suspected after a private chat that there is actually a different reason behind it, something like interrupt.pending should be cleared when the injection took place via an (emulated) task switch. Any news on this, Thomas? Jan [1] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/29288
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