On Thu, Apr 30, 2020 at 11:46:06AM -0400, Igor Mammedov wrote: > Since 5.0 QEMU uses hostmem backend for allocating main guest RAM. > The backend however calls mbind() which is typically NOP > in case of default policy/absent host-nodes bitmap. > However when runing in container with black-listed mbind() > syscall, QEMU fails to start with error > "cannot bind memory to host NUMA nodes: Operation not permitted" > even when user hasn't provided host-nodes to pin to explictly > (which is the case with -m option) > > To fix issue, call mbind() only in case when user has provided > host-nodes explicitly (i.e. host_nodes bitmap is not empty). > That should allow to run QEMU in containers with black-listed > mbind() without memory pinning. If QEMU provided memory-pinning > is required user still has to white-list mbind() in container > configuration. > > Reported-by: Manuel Hohmann <mhohm...@physnet.uni-hamburg.de> > Signed-off-by: Igor Mammedov <imamm...@redhat.com>
Queued on machine-next, thanks! -- Eduardo
