[libvirt] [PATCH] tests: Disable some tests on 32 bit systems

[Daniel P. Berrangé]

On Thu, Mar 28, 2019 at 12:30:30PM +0100, Michal Privoznik wrote:
> On 32 bit systems there are two tests failing currently:
> qemufirmwaretest and qemuxml2argvtest (not every test case in
> them is failing, only some of them). There are several problems:
> 
> 1) in qemufirmwaretest it's 'QEMU FW precedence test' which is
> failing. This is because the code tests
> qemuFirmwareFetchConfigs() which tries to compile a list of some
> paths from the system and if one of the paths is an empty file it
> should not appear on the returned list. The code uses
> virFileLength() to query the file size which uses stat() under
> the hood. The test uses virfilewrapper to redirect stat() into
> qemufirmwaredata/ but for reasons beyond me real_stat() returns
> mangled buffer making the code see a file with a real size even
> for empty files. I've track this one to a problem in
> virfilewrapper.c which will call real___xstat() which points to a
> function in libvirt.so (!) which returns stat with 32bit members
> even though we're compiling with LARGE_FILE and therefore expect
> 64bit members in the stat struct.
> 
> 2) qemuxml2argvtest has two tests failing:
> 2a) [aarch64-]os-firmware-* - These fail because of the same
> reason as described in 1)
> 
> 2b) pseries-hostdevs-* - These fail because they again rely on
> some stat (lstat to be precise). When building the cmd line for
> these test cases the code does some search in /sys/bus/pci/...
> and since we have virpcimock everything works just fine. Except
> when virfilewrapper.c is linked in because then lstat() is taken
> from there and when it initializes itself it will lookup
> real_lstat() which will now point not to virpcimock but to glibc.
> Again, reasons beyond me.
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
> ---
> 
> Quite frankly, I hate this patch. But the problem is in our mocking, not
> in the actual code its testing. And I've tried everything I was able to
> come up with on how to fix this. So if you have any idea, I'm all ears.

I'm happy to take a look at this.  I wouldn't be surprised if there is
an entirely different syscall API that needs mocking on 32bit to deal
with the largefile stuff.


>  tests/qemufirmwaretest.c | 7 +++++++
>  tests/qemuxml2argvtest.c | 6 ++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/tests/qemufirmwaretest.c b/tests/qemufirmwaretest.c
> index 2b5cbf649b..3332bf0a34 100644
> --- a/tests/qemufirmwaretest.c
> +++ b/tests/qemufirmwaretest.c
> @@ -52,6 +52,8 @@ testParseFormatFW(const void *opaque)
>  }
>  
>  
> +#if defined(__x86_64__) || defined(__amd64__) || defined(__aarch64__)
> +/* XXX Dirty hack, but mocking stat on 32bits is above my skills */
>  static int
>  testFWPrecedence(const void *opaque ATTRIBUTE_UNUSED)
>  {
> @@ -97,6 +99,7 @@ testFWPrecedence(const void *opaque ATTRIBUTE_UNUSED)
>  
>      return 0;
>  }
> +#endif
>  
>  
>  static int
> @@ -124,8 +127,12 @@ mymain(void)
>      DO_PARSE_TEST("usr/share/qemu/firmware/61-ovmf.json");
>      DO_PARSE_TEST("usr/share/qemu/firmware/70-aavmf.json");
>  
> +
> +#if defined(__x86_64__) || defined(__amd64__) || defined(__aarch64__)
> +    /* XXX Dirty hack, but mocking stat on 32bits is above my skills */
>      if (virTestRun("QEMU FW precedence test", testFWPrecedence, NULL) < 0)
>          ret = -1;
> +#endif
>  
>      virFileWrapperClearPrefixes();
>  
> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> index 0c0dcae197..364792d24d 100644
> --- a/tests/qemuxml2argvtest.c
> +++ b/tests/qemuxml2argvtest.c
> @@ -2038,6 +2038,8 @@ mymain(void)
>      DO_TEST("pseries-many-buses-2",
>              QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
>              QEMU_CAPS_VIRTIO_SCSI);
> +# if defined(__x86_64__) || defined(__amd64__) || defined(__aarch64__)
> +    /* XXX Dirty hack, but mocking stat on 32bits is above my skills */
>      DO_TEST("pseries-hostdevs-1",
>              QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
>              QEMU_CAPS_VIRTIO_SCSI,
> @@ -2050,6 +2052,7 @@ mymain(void)
>              QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
>              QEMU_CAPS_VIRTIO_SCSI,
>              QEMU_CAPS_DEVICE_VFIO_PCI);
> +# endif
>  
>      DO_TEST("pseries-features",
>              QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE,
> @@ -3157,10 +3160,13 @@ mymain(void)
>      DO_TEST_CAPS_ARCH_LATEST("x86_64-pc-graphics", "x86_64");
>      DO_TEST_CAPS_ARCH_LATEST("x86_64-q35-graphics", "x86_64");
>  
> +# if defined(__x86_64__) || defined(__amd64__) || defined(__aarch64__)
> +    /* XXX Dirty hack, but mocking stat on 32bits is above my skills */
>      DO_TEST_CAPS_LATEST("os-firmware-bios");
>      DO_TEST_CAPS_LATEST("os-firmware-efi");
>      DO_TEST_CAPS_LATEST("os-firmware-efi-secboot");
>      DO_TEST_CAPS_ARCH_LATEST("aarch64-os-firmware-efi", "aarch64");
> +# endif
>  
>      if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
>          virFileDeleteTree(fakerootdir);
> -- 
> 2.19.2
> 
> --
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> libvir-list at redhat.com
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Regards,
Daniel
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