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...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 _____________...

Hello all, please tell me, how can I be sure that my Xen installation is built with Intel VT-d support? Something like xm info | grep -i KEY-REGULAR-EXPRESSION xm dmesg | grep -i KEY-REGULAR-EXPRESSION What line I should look for? And if it''s really built with it, how can I be sure, that Xen has successfully initialized VT-d hardware? I have read [1] and the lists archives