Re: [kvm-x86:selftests2] [KVM] a262fc49e0: kselftests.kvm.make.fail

On Fri, Aug 07, 2026 at 10:21:55PM +0000, David Matlack wrote:
> On 2026-08-07 11:35 AM, Sean Christopherson wrote:
> > On Fri, Aug 07, 2026, kernel test robot wrote:
> > > 
> > > 
> > > Hello,
> > > 
> > > kernel test robot noticed "kselftests.kvm.make.fail" on:
> > > 
> > > commit: a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757 ("KVM: selftests: Build and link selftests/vfio/lib into KVM selftests")
> > > https://github.com/kvm-x86/linux selftests2
> > > 
> > > [test failed on linux-next/master 78bc8af4affb9a732504eb22eeac7d1e50883853]
> > > 
> > > in testcase: kselftests
> > > version: kselftests-x86_64-848acc8ffe1b-1_20260804
> > > with following parameters:
> > > 
> > > 	group: kvm
> > > 
> > > 
> > > config: x86_64-rhel-9.4-kselftests
> > > compiler: gcc-14
> > > test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory
> > > 
> > > (please refer to attached dmesg/kmsg for entire log/backtrace)
> > > 
> > > 
> > > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > > the same patch/commit), kindly add following tags
> > > | Reported-by: kernel test robot <[email protected]>
> > > | Closes: https://lore.kernel.org/oe-lkp/[email protected]
> > > 
> > > 
> > > /usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/vfio/lib/drivers/ioat/ioat.c:12:10: fatal error: hw.h: No such file or directory
> > >    12 | #include "hw.h"
> > >       |          ^~~~~~
> > > compilation terminated.
> > > make[1]: *** [../vfio/lib/libvfio.mk:32:
> > > /usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/kvm/libvfio/drivers/ioat/ioat.o]
> > > Error 1 make[1]: *** Waiting for unfinished jobs....
> > > /usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/vfio/lib/drivers/dsa/dsa.c:14:10:
> > > fatal error: registers.h: No such file or directory
> > >    14 | #include "registers.h"
> > >       |          ^~~~~~~~~~~~~
> > > compilation terminated.
> > > make[1]: *** [../vfio/lib/libvfio.mk:32:
> > > /usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/kvm/libvfio/drivers/dsa/dsa.o]
> > > Error 1 make[1]: Leaving directory
> > > '/usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/kvm'
> > > make: *** [Makefile:218: all] Error 2
> > 
> > Any chance the file is literally just not there?  Makefile.kvm's -I$(<D) expands
> > to:
> > 
> >  -I/usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/vfio/lib/drivers/dsa
> > 
> > which matches the directory of the input file:
> > 
> >  -c/usr/src/perf_selftests-x86_64-rhel-9.4-kselftests-a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757/tools/testing/selftests/vfio/lib/drivers/dsa/dsa.c
> > 
> > so AFAICT the makefile is working as intended?
> 
> I think this is a problem in how the kernel test robot builds selftests.

Sorry for the wrong report. The analysis below is very helpful that the bot
ignores the symlink when packing the related sources.

We had resolved the issue for internal packing logic and we will be more careful
to avoid false positive report in future.

> 
> hw.h and registers.h are symlinks to headers in the kernel source tree.
> The selftests build works fine for me when I check out the entire kernel
> tree at commit a262fc49e0aafdeeb1b4fd8cb0d79a0fde447757 and build the
> KVM selftests.
> 
> But if I delete one of the symlink destinations, I see the same error.
> 
> $ ls -l tools/testing/selftests/vfio/lib/drivers/dsa/registers.h
> [...] tools/testing/selftests/vfio/lib/drivers/dsa/registers.h -> ../../../../../../../drivers/dma/idxd/registers.h
> 
> $ rm drivers/dma/idxd/registers.h
> 
> $ make -C tools/testing/selftests/kvm -s
> /usr/local/google/home/dmatlack/kernel/trees/kvm/tools/testing/selftests/vfio/lib/drivers/dsa/dsa.c:14:10: fatal error: registers.h: No such file or directory
>    14 | #include "registers.h"
>       |          ^~~~~~~~~~~~~
> compilation terminated.
> make: *** [../vfio/lib/libvfio.mk:32: /usr/local/google/home/dmatlack/kernel/trees/kvm/tools/testing/selftests/kvm/libvfio/drivers/dsa/dsa.o] Error 1
> 
> Maybe the kernel test robot doesn't download the entire kernel tree when
> building selftests?
>