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[Xen-devel] readonly grants

To: xen-devel@xxxxxxxxxxxxxxxxxxx
From: Mohammad Hedayati <hedayati.mo@xxxxxxxxx>
Date: Wed, 26 Oct 2011 20:16:49 +0330
Delivery-date: Wed, 26 Oct 2011 09:49:20 -0700
List-id: Xen developer discussion <xen-devel.lists.xensource.com>

After mapping a readonly granted page in a PV guest, the guest can try to change his l1 page table entry, faulting into Xen. Here xen emulates the update operation, but first it must check whether the modification is allowed or not (i.e. the grant is readonly or not).

I'm looking through the code, but I can't find where this checking is done. Can anyone help?!

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