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[Xen-devel] Memory Sharing

To: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
From: hanji unit <hanjiunit@xxxxxxxxx>
Date: Thu, 4 Feb 2016 16:04:55 -0500
Delivery-date: Thu, 04 Feb 2016 21:05:08 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

Hello, does Xen support sharing memory pages between multiple domains
(such as as Dom0, DomU1, DomU2)? The Grant Table hypercalls seem
limited to:

IOCTL_GNTALLOC_ALLOC_GREF
IOCTL_GNTALLOC_DEALLOC_GREF
IOCTL_GNTALLOC_SET_UNMAP_NOTIFY

Is there any mechanism to not allocate, but only share existing pages?

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