| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] Question regarding VM_EXIT and VGA |
| From: | "Sujata Doshi" <sujatadoshi@xxxxxxxxx> |
| Date: | Tue, 5 Dec 2006 10:17:53 -0500 |
| Delivery-date: | 2006年12月05日 07:17:50 -0800 |
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Hi I am working on a project using WINDOWS guest on XEN archticture. I have a couple of questions. As I understand when a VM exit occurs due to I/O like say a mouse interrupt -- the XEN hypervisor gets a notification and it forwards the I/O request to the qemu-dm in Domain-0 via an event channel. Now during this VM exit , is the guest OS blocked ? Specifically, what about VGA writes are they blocked too during a VM exit ? The following link explains that to speed up performance a shared memory area was built between qemu and the hvm guest . http://www.intel.com/technology/itj/2006/v10i3/3-xen/5-performance-tuning-vt-x.htm But I am unable to understand as to whether is this shared memory area is still accessible by the guest vga when a VM exit has taken place due to another I/O event like a mouse click? Would appreciate if you could answer my queries. Thanks Sujata _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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