Re: [PATCH v5 12/14] tests: acpi: implement TPM CRB tests for ARM virt

[Stefan Berger]

On 11/23/23 19:56, Joelle van Dyne wrote:
> On Tue, Nov 14, 2023 at 4:12 PM Stefan Berger <stefanb@linux.ibm.com> wrote:
> > On 11/14/23 16:05, Stefan Berger wrote:
> > > On 11/14/23 13:03, Stefan Berger wrote:
> > > > On 11/14/23 04:36, Marc-André Lureau wrote:
> > > > > Hi
> > > > >
> > > > > On Tue, Nov 14, 2023 at 6:12 AM Joelle van Dyne <j@getutm.app> wrote:
> > > > > > Signed-off-by: Joelle van Dyne <j@getutm.app>
> > > > > > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> > > > >
> > > > > nit: you also added tests for x86, could be a different patch?
> > > > >
> > > > > For arm, the test fails until next patch with:
> > > > >
> > > > > # starting QEMU: exec ./qemu-system-aarch64 -qtest
> > > > > unix:/tmp/qtest-991279.sock -qtest-log /dev/null -chardev
> > > > > socket,path=/tmp/qtest-991279.qmp,id=char0 -mon
> > > > > chardev=char0,mode=control -display none -audio none -machine virt
> > > > > -accel tcg -nodefaults -nographic -drive
> > > > > if=pflash,format=raw,file=pc-bios/edk2-aarch64-code.fd,readonly=on
> > > > > -drive if=pflash,format=raw,file=pc-bios/edk2-arm-vars.fd,snapshot=on
> > > > > -cdrom tests/data/uefi-boot-images/bios-tables-test.aarch64.iso.qcow2
> > > > > -cpu cortex-a57 -chardev
> > > > > socket,id=chr,path=/tmp/qemu-test_acpi_virt_tcg_crb-device.KZ3GE2/sock
> > > > > -tpmdev emulator,id=dev,chardev=chr -device tpm-crb-device,tpmdev=dev
> > > > > -accel qtest
> > > > > Warning! zero length expected file
> > > > > 'tests/data/acpi/virt/TPM2.crb-device.tpm2'
> > > > > Warning! zero length expected file
> > > > > 'tests/data/acpi/virt/DSDT.crb-device.tpm2'
> > > > > acpi-test: Warning!  binary file mismatch. Actual
> > > > > [aml:/tmp/aml-GO4ME2], Expected
> > > > > [aml:tests/data/acpi/virt/TPM2.crb-device.tpm2].
> > > > > See source file tests/qtest/bios-tables-test.c for instructions on how
> > > > > to update expected files.
> > > > > acpi-test: Warning!  binary file mismatch. Actual
> > > > > [aml:/tmp/aml-6N4ME2], Expected
> > > > > [aml:tests/data/acpi/virt/DSDT.crb-device.tpm2].
> > > > > See source file tests/qtest/bios-tables-test.c for instructions on how
> > > > > to update expected files.
> > > > > to see ASL diff between mismatched files install IASL, rebuild QEMU
> > > > > from scratch and re-run tests with V=1 environment variable set**
> > > > > ERROR:../tests/qtest/bios-tables-test.c:538:test_acpi_asl: assertion
> > > > > failed: (all_tables_match)
> > > > > not ok /aarch64/acpi/virt/tpm2-crb -
> > > > > ERROR:../tests/qtest/bios-tables-test.c:538:test_acpi_asl: assertion
> > > > > failed: (all_tables_match)
> > > > > Bail out!
> > > > > qemu-system-aarch64: tpm-emulator: Could not cleanly shutdown the TPM:
> > > > > Resource temporarily unavailable
> > > > > Unexpected error in qio_channel_socket_writev() at
> > > > > ../io/channel-socket.c:622:
> > > > > /home/elmarco/src/qemu/buildall/tests/qtest/bios-tables-test: Unable
> > > > > to write to socket: Bad file descriptor
> > > >
> > > > Travis testing on s390x I see the following failures for this patchset
> > > > (search for 'ERROR'):
> > > >
> > > > https://app.travis-ci.com/github/stefanberger/qemu-tpm/builds/267230363
> > > >
> > > > Summary of Failures:
> > > >
> > > > 134/320 qemu:qtest+qtest-aarch64 / qtest-aarch64/tpm-crb-device-test
> > > > ERROR           0.70s   killed by signal 6 SIGABRT
> > > >
> > > > 219/320 qemu:qtest+qtest-x86_64 / qtest-x86_64/tpm-crb-test
> > > > ERROR           0.88s   killed by signal 6 SIGABRT
> > > >
> > > >
> > > > Summary of Failures:
> > > >
> > > > 271/537 qemu:qtest+qtest-i386 / qtest-i386/tpm-crb-test
> > > > ERROR           0.59s   killed by signal 6 SIGABRT
> > > >
> > > >
> > > > My guess is it's an endianess issue on big endian machines due to
> > > > reading from the ROM device where we lost the .endianess:
> > > >
> > > > +const MemoryRegionOps tpm_crb_memory_ops = {
> > > > +    .read = tpm_crb_mmio_read,
> > > > +    .write = tpm_crb_mmio_write,
> > > > +    .endianness = DEVICE_LITTLE_ENDIAN,
> > > > +    .valid = {
> > > > +        .min_access_size = 1,
> > > > +        .max_access_size = 4,
> > > > +    },
> > > > +};
> > >
> > > I think we need a 2nd set of registers to support the endianess
> > > conversion. It's not exactly nice, though. Basically the saved_regs
> > > could be used for this directly, even though I did not do that but
> > > introduced n_regs:
> > > https://github.com/stefanberger/qemu-tpm/commit/90f6b21c0dd93dbb13d9e80a628f5b631fd07d91
> > >
> > > This patch allows the tests on s390x to run farther but the execution of
> > > the command doesn't seem to work maybe due to command data that were
> > > also written in wrong endianess. I don't know. I would have to get
> > > access to a big endian / s390 machine to be able to fix it.
> >
> > The latest version now passes on Travis s390x:
> > https://app.travis-ci.com/github/stefanberger/qemu-tpm/builds/267245220
>
> Are the tests failing on S390X due to the added code or are they
> failing because previously it was untested? I don't think the original
> code took account of endianness and that should be fixed, but feels
> like it should be in a separate patch set?

They are failing because something like the topmost one or two patches 
as in this branch here are missing for a big endian host:

https://github.com/stefanberger/qemu-tpm/tree/joelle.v5%2B2nd_registers