Re: [Qemu-devel] [qemu-s390x] [PATCH v4 1/6] vfio-ccw: make it safe to access channel programs

[Halil Pasic <pasic@linux.ibm.com>]

On Thu, 11 Apr 2019 18:36:48 +0200
Cornelia Huck <cohuck@redhat.com> wrote:

> On Thu, 11 Apr 2019 12:25:38 -0400
> Eric Farman <farman@linux.ibm.com> wrote:
> 
> > On 4/11/19 11:58 AM, Halil Pasic wrote:
> > > On Wed, 10 Apr 2019 22:59:41 -0400
> > > Eric Farman <farman@linux.ibm.com> wrote:
> > >   
> > >> r the next release :) It would be one thing less on my plate...  
> > >>>>     
> > >>>
> > >>> Sorry I was not able to spend any significant amount of time on this
> > >>> lately.
> > >>>
> > >>> Gave the combined set (this + Farhans fio-ccw fixes for kernel
> > >>> stacktraces v2) it a bit of smoke testing after some minor adjustments
> > >>> to make it compile:
> > >>>
> > >>> --- a/drivers/s390/cio/vfio_ccw_ops.c
> > >>> +++ b/drivers/s390/cio/vfio_ccw_ops.c
> > >>> @@ -13,6 +13,7 @@
> > >>>    #include <linux/vfio.h>
> > >>>    #include <linux/mdev.h>
> > >>>    #include <linux/nospec.h>
> > >>> +#include <linux/slab.h>
> > >>>    
> > >>>    #include "vfio_ccw_private.h"
> > >>>
> > >>>      
> > >>
> > >> Hrm...  Taking today's master, and the two series you mention (slight
> > >> adjustment to apply patch 3 of Connie's series, because part of it was
> > >> split out a few weeks ago), and I don't encounter this.  Tried switching
> > >> between SLUB/SLAB, but still compiles fine.  
> > > 
> > > Let me guess: you have CONFIG_PCI in our .config, right?
> > > 
> > > In arch/s390/include/asm/pci_io.h we have
> > > 
> > > #ifndef _ASM_S390_PCI_IO_H
> > > #define _ASM_S390_PCI_IO_H
> > > 
> > > #ifdef CONFIG_PCI
> > > 
> > > #include <linux/kernel.h>
> > > #include <linux/slab.h>
> > > 
> > > and pci_io.h comes in via
> > > 
> > > include/linux/vfio.h
> > > include/linux/iommu.h
> > > include/linux/scatterlist.h
> > > arch/s390/include/asm/io.h
> > > arch/s390/include/asm/pci_io.h
> > > 
> > > 
> > > Figured it out with help from Farhan. Took me quite some time.  
> > 
> > That would have been useful information up front.
> 
> Indeed. It's trivial to fold that change in, though :) (Should be in
> patch 4, if I see it correctly.)
> 

#4 vfio-ccw: add capabilities chain it is!

Cheers,
Halil