On 06/18/2018 03:36 AM, Juergen Gross wrote: > For passing arbitrary data from user land to the Xen hypervisor the > Xen tools today are using mlock()ed buffers. Unfortunately the kernel > might change access rights of such buffers for brief periods of time > e.g. for page migration or compaction, leading to access faults in the > hypervisor, as the hypervisor can't use the locks of the kernel. > > In order to solve this problem add a new device node to the Xen privcmd > driver to easily allocate hypercall buffers via mmap(). The memory is > allocated in the kernel and just mapped into user space. Marked as > VM_IO the user mapping will not be subject to page migration et al. > > Signed-off-by: Juergen Gross <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]> _______________________________________________ Xen-devel mailing list [email protected] https://lists.xenproject.org/mailman/listinfo/xen-devel
