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[Xen-devel] [PATCH] Use virtual 8086 mode for VMX guests with CR0.PE ==
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] [PATCH] Use virtual 8086 mode for VMX guests with CR0.PE == 0 |
| From: | Tim Deegan <Tim.Deegan@xxxxxxxxxx> |
| Date: | Tue, 9 Dec 2008 16:18:37 +0000 |
| Delivery-date: | Tue, 09 Dec 2008 08:19:12 -0800 |
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| User-agent: | Mutt/1.5.17 (2007-11-01) |
When a VMX guest tries to enter real mode, put it in virtual 8086 mode instead, if that's possible. Handle all errors and corner cases by falling back to the real-mode emulator. This is similar to the old VMXASSIST system except it uses Xen's x86_emulate emulator instead of having a partial emulator in the guest firmware. It more than doubles the speed of real-mode operation on VMX. Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
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