On Thu, Feb 26, 2015 at 11:50:42AM +1030, Rusty Russell wrote: > Thomas Huth <thuth@xxxxxxxxxxxxxxxxxx> writes: > > Hi all, > > > > with the recent kernel 3.19, I get a kernel warning when I start my > > KVM guest on s390 with virtio balloon enabled: > > The deeper problem is that virtio_ccw_get_config just silently fails on > OOM. > > Neither get_config nor set_config are expected to fail. > > Cornelia, I think ccw and config_area should be allocated inside vcdev. > You could either use pointers, or simply allocate vcdev with GDP_DMA. > > This would avoid the kmalloc inside these calls. > > Thanks, > Rusty. But it won't solve the problem of nested sleepers with ccw: ATM is invokes ccw_io_helper to execute commands, and that one calls wait_event to wait for an interrupt. Might be fixable but I think my patch looks like a safer solution for 4.0/3.19, no? -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
