On Thu, Feb 4, 2016 at 2:04 PM, hanji unit <hanjiu...@gmail.com> wrote:
> 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? > There is, it's call mem_share in Xen, but it's not very well (khm at all) documented. You can take a look at http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/tests/mem-sharing/memshrtool.c;h=437c7c9c472c0eff29b60e54f3de90e878de6d34;hb=HEAD to see an outline of the tools-side functions that control it. I also have a simple clone routine that deduplicates (clones) two identical VMs here https://github.com/tklengyel/drakvuf/blob/master/src/xen_helper/xen_helper.c#L197 . Cheers, Tamas
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