On 07/12/2010 01:56 AM, Mohammed Gamal wrote:
fter some conversation with Avi concerning why unreal mode has been seen to work
with KVM on Intel. It clears out the scenario is caused as follows:
- guest enters big real mode
- kvm squashes limit to 64k-1
- guest executes instructions with offset> 64k
- cpu issues #GP due to limit violation
- kvm handle_rmode_exception() -> emulator
- emulator ignores limit, emulates instruction
With these applied I am getting vmentry failures with SeaBIOS and
gPXE. I could still get SeaBIOS to work with emulate_invalid_guest_state=1.
So it's needless to say that these patches are not meant for merging!
Well, eventually you need to fix this.
--------
Changes from v2:
- Addeded generic segment limit check helpers
- Removed individual segment register segment helpers as they're no longer
needed
What about the rest of my comments?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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