On 5/15/16 11:40 AM, Dagaen Golomb wrote: > Hi All, > > I'm having an interesting issue. I am working on a project that > requires me to share memory between dom0 and domUs. I have this > successfully working using the grant table and the XenStore to > communicate grefs. > > My issue is this. I have one domU running Ubuntu 12.04 with a default > 3.8.x kernel that has no issue reading or writing from the XenStore. > My work also requires some kernel modifications, and we have made > these changes in the 4.1.0 kernel. In particular, we've only added a > simple hypercall. This modified kernel is what dom0 is running, on top > of Xen 4.7 rc1.
Without reading the rest of the thread but seeing the kernel versions. Can you check how you're communicating to xenstore? Is it via /dev/xen/xenbus or /proc/xen/xenbus? Anything after 3.14 will give you deadlocks if you try to use /proc/xen/xenbus. Xen 4.6 and newer should prefer /dev/xen/xenbus. Same thing can happen with privcmd but making that default didn't land until Xen 4.7. Since you're on the right versions I expect you're using /dev/xen/xenbus but you never know. -- Doug Goldstein
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