[libvirt] [PATCH v3 3/3] tests: add test case for tpm-crb QEMU device command line

[John Ferlan]

I'll change the $subj to be:

qemu: Add tpm-crb QEMU device to the command line

On 04/26/2018 01:42 PM, Stefan Berger wrote:
> Add a test case for the formation of the tpm-crb QEMU device
> command line.

And the commit msg changes to:

Alter qemuBuildTPMDevStr to format the tpm-crb on the command line
and use the enum range checking for valid model.

Add a test case for the formation of the tpm-crb QEMU device
command line. The qemuxml2argvtest changes cannot use the newer
DO_TEST_CAPS_LATEST since building of the command line involves
calling qemuBuildTPMBackendStr which attempts to open the
path to the device (e.g. /dev/tmp0).

> 
> Signed-off-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
> ---
>  src/qemu/qemu_command.c                         | 16 ++++++++++++++-
>  tests/qemuxml2argvdata/tpm-passthrough-crb.args | 26 +++++++++++++++++++++++++
>  tests/qemuxml2argvtest.c                        |  2 ++
>  3 files changed, 43 insertions(+), 1 deletion(-)
>  create mode 100644 tests/qemuxml2argvdata/tpm-passthrough-crb.args
> 

So this does bring up a couple of interesting notes for "additional"
work or checks...

   1. More recent adjustments for libvirt have begun to use the
qemuProcessPrepare* type functions in order to perform similar things
like the open on the /dev/tpm0 in qemuBuildTPMBackendStr. This leaves
only building the command line in the qemu_command.c code. I'm not even
sure this works with the TPM model given how the code passes the tpmfd
to the command line. Still see qemuProcessPrepareChardevDevice (and it's
corollary qemuProcessCleanupChardevDevice). There is another series
upstream with a similar problem, see:

https://www.redhat.com/archives/libvir-list/2018-April/msg01797.html

and in particular patch 2 of the series. That may "solve" this open as well.

   2. Does /dev/tpm0 need to play nicely in the QEMU name space code?
See qemuDomainNamespace{Setup|Teardown}* functions.  I have a feeling it
may, but I'm not 100% sure. Michal Privoznik would be the contact point.

> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 418729b..198b44e 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -9387,8 +9387,22 @@ qemuBuildTPMDevStr(const virDomainDef *def,
>      virBuffer buf = VIR_BUFFER_INITIALIZER;
>      const virDomainTPMDef *tpm = def->tpm;
>      const char *model = virDomainTPMModelTypeToString(tpm->model);
> +    virQEMUCapsFlags flag;
>  
> -    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_TPM_TIS)) {
> +    switch (tpm->model) {
> +    case VIR_DOMAIN_TPM_MODEL_TIS:
> +        flag = QEMU_CAPS_DEVICE_TPM_TIS;
> +        break;
> +    case VIR_DOMAIN_TPM_MODEL_CRB:
> +        flag = QEMU_CAPS_DEVICE_TPM_CRB;
> +        break;
> +    case VIR_DOMAIN_TPM_MODEL_LAST:

Added the default: case; otherwise, ... [1]

> +        virReportError(VIR_ERR_INTERNAL_ERROR,
> +                       _("Unknown TPM device model %d"), tpm->model);

change this to

        virReportEnumRangeError(virDomainTPMModel, tpm->model);

> +        goto error;
> +    }
> +
> +    if (!virQEMUCapsGet(qemuCaps, flag)) {

[1] ... this failed during my build because @flag wouldn't be defined
supposedly ...

>          virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
>                         _("The QEMU executable %s does not support TPM "
>                         "model %s"),
> diff --git a/tests/qemuxml2argvdata/tpm-passthrough-crb.args b/tests/qemuxml2argvdata/tpm-passthrough-crb.args
> new file mode 100644
> index 0000000..010495d
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/tpm-passthrough-crb.args

syntax-check tells me there's some long lines in here that need to be
wrapped using:

tests/test-wrap-argv.pl -i tests/qemuxml2argvdata/tpm-passthrough-crb.args

I've made the adjustments and will push the series once 4.4.0 opens
(assuming no one else jumps in and comes up with something I've missed).

Reviewed-by: John Ferlan <jferlan at redhat.com>

John



> @@ -0,0 +1,26 @@
> +LC_ALL=C \
> +PATH=/bin \
> +HOME=/home/test \
> +USER=test \
> +LOGNAME=test \
> +QEMU_AUDIO_DRV=none \
> +/usr/bin/qemu-system-x86_64 \
> +-name TPM-VM \
> +-S \
> +-machine pc-i440fx-2.12,accel=tcg,usb=off,dump-guest-core=off \
> +-m 2048 -\
> +smp 1,sockets=1,cores=1,threads=1 \
> +-uuid 11d7cd22-da89-3094-6212-079a48a309a1 \
> +-display none \
> +-no-user-config \
> +-nodefaults \
> +-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-TPM-VM/monitor.sock,server,nowait \
> +-mon chardev=charmonitor,id=monitor,mode=control \
> +-rtc base=utc \
> +-no-shutdown \
> +-boot order=c,menu=on \
> +-usb \
> +-tpmdev passthrough,id=tpm-tpm0,path=/dev/tpm0,\
> +cancel-path=/sys/class/misc/tpm0/device/cancel \
> +-device tpm-crb,tpmdev=tpm-tpm0,id=tpm0 \
> +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> index 5b3bd4a..fe2cca4 100644
> --- a/tests/qemuxml2argvtest.c
> +++ b/tests/qemuxml2argvtest.c
> @@ -2001,6 +2001,8 @@ mymain(void)
>  
>      DO_TEST("tpm-passthrough",
>              QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_TIS);
> +    DO_TEST("tpm-passthrough-crb",
> +            QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_CRB);
>      DO_TEST_PARSE_ERROR("tpm-no-backend-invalid",
>                          QEMU_CAPS_DEVICE_TPM_PASSTHROUGH, QEMU_CAPS_DEVICE_TPM_TIS);
>  
>