On Thu, Nov 10, Boris Ostrovsky wrote: > Are you sure it's this patch that causes the failure? > > I commented out '| VM_IO' and still unable to boot with this option. Yes, this works for me, sles12sp2 dom0+domU, which is linux-4.4 based: +++ b/drivers/xen/gntdev.c @@ -804,7 +804,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) vma->vm_ops = &gntdev_vmops; - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO; + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP /*| VM_IO*/; if (use_ptemod) vma->vm_flags |= VM_DONTCOPY; with this domU.cfg: name="x" memory=1024 serial="pty" builder="hvm" disk=[ 'vdev=xvda, direct-io-safe, backendtype=qdisk, target=x.raw', ] vif=[ 'bridge=br0' ] keymap="de" cmdline="linemode=1 console=ttyS0,115200 ignore_loglevel install=http://host/sles_dvd1/ start_shell" kernel= "/sles_dvd1/boot/x86_64/vmlinuz-xen" ramdisk="/sles_dvd1/boot/x86_64/initrd-xen" Without VM_IO 'fdisk -l /dev/xvda' works, with VM_IO 'fdisk -l /dev/xvda' gives IO errors. Olaf
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