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Re: [Xen-devel] Re: Next steps with pv_ops for Xen

To: "Stephen C. Tweedie" <sct@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: Next steps with pv_ops for Xen
From: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date: Wed, 05 Dec 2007 13:51:41 +0100
Cc: Derek Murray <Derek.Murray@xxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, Juan Quintela <quintela@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxx>
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  Hi,

> gntdev doesn't even try to handle forking.  I wouldn't be surprised if
> that is a great way to kill Domain-0.  The xen hypervisor will most
> likely not be amused to find a pte refering to a granted (but foreign)
> page which wasn't established using the grant table interface.  Pinning
> the pgd of the child process will most likely fail and make the kernel
> BUG().

Ok, isn't that bad thanks to the VM_DONTCOPY.  The child just doesn't
get the grant mapping.

cheers,
  Gerd


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