Re: [PATCH] virtio-mmio: fix guest kernel crash with SHM regions

[Gerd Hoffmann]

  Hi,

> > According to the comments in the kernel, a non existent shared region
> > has a length of (u64)-1.

virtio spec says the same.

> > +   case VIRTIO_MMIO_SHM_LEN_LOW:
> > +   case VIRTIO_MMIO_SHM_LEN_HIGH:
> > +        /*
> > +         * VIRTIO_MMIO_SHM_SEL is unimplemented
> > +         * according to the linux driver, if region length is -1
> > +         * the shared memory doesn't exist
> > +         */
> > +        return -1;

Acked-by: Gerd Hoffmann <kraxel@redhat.com>

take care,
  Gerd