linux-kernel - Re: [PATCH] vfio: Fix build failure seen if vfio is built as module and EEH is enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 09 Aug 2014 17:18:10 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] vfio: Fix build failure seen if vfio is built as module
 and EEH is enabled

On Sat, 2014-08-09 at 15:28 -0700, Guenter Roeck wrote:
> On 08/09/2014 12:28 PM, Alex Williamson wrote:
> > On Sat, 2014-08-09 at 10:04 -0700, Guenter Roeck wrote:
> >> The following build failure is seen with ppc:allmodconfig.
> >>
> >> ERROR: ".vfio_spapr_iommu_eeh_ioctl" [drivers/vfio/vfio_iommu_spapr_tce.ko] undefined!
> >> ERROR: ".vfio_spapr_pci_eeh_open" [drivers/vfio/pci/vfio-pci.ko] undefined!
> >> ERROR: ".vfio_spapr_pci_eeh_release" [drivers/vfio/pci/vfio-pci.ko] undefined!
> >>
> >> Simply exporting the missing symbols is insufficient, since drivers/vfio
> >> can be built as module but drivers/vfio/vfio_spapr_eeh.c depends on
> >> EEH which is boolean. The combination of obj-m for drivers/vfio and obj-y
> >> for drivers/vfio/vfio_spapr_eeh.o results in the symbols being missed even
> >> if exported.
> >>
> >> Export missing symbols and introduce new tristate configuration option
> >> VFIO_EEH depending on both EEH and VFIO to fix the problem.
> >>
> >> Cc: Gavin Shan <gwshan@...ux.vnet.ibm.com>
> >> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> >> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> >
> > Please try:
> >
> > git://github.com/awilliam/linux-vfio.git next
> >
> > This will be part of the next linux-next build, should resolve the
> > problem, and I plan to ask for a pull early this coming week.  Thanks,
> >
> 
> That should do for the most part, but it will select VFIO_SPAPR_EEH
> even if EEH is not configured. You would need something like
> 	select VFIO_SPAPR_EEH if (PPC_POWERNV || PPC_PSERIES) && EEH
> to prevent that.

Feel free to post a patch against this branch.  Thanks,

Alex


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/