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[Xen-devel] [PATCH] Use virtual 8086 mode for VMX guests with CR0.PE == 0

To: xen-devel@xxxxxxxxxxxxxxxxxxx
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
List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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>

Attachment: virtual-8086
Description: Text document

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