On Wed, Jan 31, 2018 at 06:40:59PM -0200, Eduardo Habkost wrote: > On Wed, Jan 17, 2018 at 11:54:18AM +0200, Marcel Apfelbaum wrote: > > Currently only file backed memory backend can > > be created with a "share" flag in order to allow > > sharing guest RAM with other processes in the host. > > > > Add the "share" flag also to RAM Memory Backend > > in order to allow remapping parts of the guest RAM > > to different host virtual addresses. This is needed > > by the RDMA devices in order to remap non-contiguous > > QEMU virtual addresses to a contiguous virtual address range. > > > > Why do we need to make this configurable? Would anything break > if MAP_SHARED was always used if possible?
See Documentation/vm/numa_memory_policy.txt for a list of complications. Maybe we should more of an effort to detect and report these issues. > > > Moved the "share" flag to the Host Memory base class, > > modified phys_mem_alloc to include the new parameter > > and a new interface memory_region_init_ram_shared_nomigrate. > > > > There are no functional changes if the new flag is not used. > > > > Signed-off-by: Marcel Apfelbaum <mar...@redhat.com> > [...] > > -- > Eduardo
