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[Xen-devel] Checkpointing for HVM guest with PV driver

To: Brendan Cully <brendan@xxxxxxxxx>
Subject: [Xen-devel] Checkpointing for HVM guest with PV driver
From: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Date: Wed, 8 Sep 2010 22:36:44 +0800
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Thread-topic: Checkpointing for HVM guest with PV driver
Hi, Brendan, I noticed following code in checkpoint_open() in 

    } else if (s->domtype == dt_pvhvm) {
       s->errstr = "PV-on-HVM is unsupported";

       return -1;

This check means for HVM guest with PV driver, the checkpoint/remus will not 
work. Are there any special reason for this checking?

Originally I thought PV driver on HVM guest can't live migrate, but I did a 
quick experimental to live migration a HVM guest with PV driver installed, (I 
only tried to migrate to localhost since I have only one system on hand) and 
seems it works well, so what's the reason for this restriction?


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