[libvirt] [PATCH V1 1/6] Add QMP probing for TPM
Daniel P. Berrange
berrange at redhat.com
Thu Mar 14 14:20:40 UTC 2013
On Wed, Mar 13, 2013 at 12:03:49PM -0400, Stefan Berger wrote:
> Probe for QEMU's QMP TPM support by querying the lists of
> supported TPM models (query-tpm-models) and backend types
> (query-tpm-types).
>
> The setting of the capability flags following the strings
> returned from the commands above is only provided in the
> patch where domain_conf.c gets TPM support due to dependencies
> on functions only introduced there.
>
> Signed-off-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
>
> ---
> src/libvirt_private.syms | 1
> src/qemu/qemu_capabilities.c | 61 ++++++++++++++++++++++++++++
> src/qemu/qemu_capabilities.h | 3 +
> src/qemu/qemu_monitor.c | 44 ++++++++++++++++++++
> src/qemu/qemu_monitor.h | 6 ++
> src/qemu/qemu_monitor_json.c | 91 +++++++++++++++++++++++++++++++++++++++++++
> src/qemu/qemu_monitor_json.h | 8 +++
> src/util/virutil.c | 14 ++++++
> src/util/virutil.h | 3 +
> 9 files changed, 231 insertions(+)
>
> Index: libvirt/src/qemu/qemu_capabilities.c
> ===================================================================
> --- libvirt.orig/src/qemu/qemu_capabilities.c
> +++ libvirt/src/qemu/qemu_capabilities.c
> @@ -210,6 +210,8 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAS
>
> "rng-random", /* 130 */
> "rng-egd",
> + "tpm-passthrough",
> + "tpm-tis",
> );
>
> struct _virQEMUCaps {
> Index: libvirt/src/qemu/qemu_capabilities.h
> ===================================================================
> --- libvirt.orig/src/qemu/qemu_capabilities.h
> +++ libvirt/src/qemu/qemu_capabilities.h
> @@ -171,6 +171,8 @@ enum virQEMUCapsFlags {
> QEMU_CAPS_OBJECT_RNG_RANDOM = 130, /* the rng-random backend for
> virtio rng */
> QEMU_CAPS_OBJECT_RNG_EGD = 131, /* EGD protocol daemon for rng */
> + QEMU_CAPS_DEVICE_TPM_PASSTHROUGH = 132, /* -tpmdev passthrough */
> + QEMU_CAPS_DEVICE_TPM_TIS = 133, /* -device tpm_tis */
I'm wondering whether we really need to spend 2 capability bits on
this. Is it possible to build QEMU such that we have one, but not
the other ? If not then one capability would suffice
> Index: libvirt/src/qemu/qemu_monitor.c
> ===================================================================
> --- libvirt.orig/src/qemu/qemu_monitor.c
> +++ libvirt/src/qemu/qemu_monitor.c
> @@ -3522,3 +3522,47 @@ int qemuMonitorNBDServerStop(qemuMonitor
>
> return qemuMonitorJSONNBDServerStop(mon);
> }
> +
> +
> +int qemuMonitorGetTPMModels(qemuMonitorPtr mon,
> + char ***tpmmodels)
> +{
> + VIR_DEBUG("mon=%p tpmmodels=%p",
> + mon, tpmmodels);
> +
> + if (!mon) {
> + virReportError(VIR_ERR_INVALID_ARG, "%s",
> + _("monitor must not be NULL"));
> + return -1;
> + }
> +
> + if (!mon->json) {
> + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
> + _("JSON monitor is required"));
> + return -1;
> + }
> +
> + return qemuMonitorJSONGetTPMModels(mon, tpmmodels);
> +}
> +
> +
> +int qemuMonitorGetTPMTypes(qemuMonitorPtr mon,
> + char ***tpmtypes)
> +{
> + VIR_DEBUG("mon=%p tpmtypes=%p",
> + mon, tpmtypes);
> +
> + if (!mon) {
> + virReportError(VIR_ERR_INVALID_ARG, "%s",
> + _("monitor must not be NULL"));
> + return -1;
> + }
> +
> + if (!mon->json) {
> + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
> + _("JSON monitor is required"));
> + return -1;
> + }
> +
> + return qemuMonitorJSONGetTPMTypes(mon, tpmtypes);
> +}
> Index: libvirt/src/qemu/qemu_monitor.h
> ===================================================================
> --- libvirt.orig/src/qemu/qemu_monitor.h
> +++ libvirt/src/qemu/qemu_monitor.h
> @@ -683,6 +683,12 @@ int qemuMonitorNBDServerAdd(qemuMonitorP
> const char *deviceID,
> bool writable);
> int qemuMonitorNBDServerStop(qemuMonitorPtr);
> +int qemuMonitorGetTPMModels(qemuMonitorPtr mon,
> + char ***tpmmodels);
> +
> +int qemuMonitorGetTPMTypes(qemuMonitorPtr mon,
> + char ***tpmtypes);
> +
> /**
> * When running two dd process and using <> redirection, we need a
> * shell that will not truncate files. These two strings serve that
> Index: libvirt/src/qemu/qemu_monitor_json.c
> ===================================================================
> --- libvirt.orig/src/qemu/qemu_monitor_json.c
> +++ libvirt/src/qemu/qemu_monitor_json.c
> @@ -4707,3 +4707,94 @@ qemuMonitorJSONNBDServerStop(qemuMonitor
> virJSONValueFree(reply);
> return ret;
> }
> +
> +
> +static int
> +qemuMonitorJSONGetStringArray(qemuMonitorPtr mon, const char *qmpCmd,
> + char ***array)
> +{
> + int ret;
> + virJSONValuePtr cmd;
> + virJSONValuePtr reply = NULL;
> + virJSONValuePtr data;
> + char **list = NULL;
> + int n = 0;
> + size_t i;
> +
> + *array = NULL;
> +
> + if (!(cmd = qemuMonitorJSONMakeCommand(qmpCmd, NULL)))
> + return -1;
> +
> + ret = qemuMonitorJSONCommand(mon, cmd, &reply);
> +
> + if (ret == 0)
> + ret = qemuMonitorJSONCheckError(cmd, reply);
> +
> + if (ret < 0)
> + goto cleanup;
> +
> + ret = -1;
> +
> + if (!(data = virJSONValueObjectGet(reply, "return"))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("%s reply was missing return data"),
> + qmpCmd);
> + goto cleanup;
> + }
I think everything above this point should be in the main monitor APIs,
and this method concern itself solely with converting the virJSONValuePtr
into a string array, not actually executing command. This makes the code
more portable for use in commands which need control over the command
execution to handle errors / pass arguments.
> +
> + if ((n = virJSONValueArraySize(data)) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("%s reply data was not an array"),
> + qmpCmd);
> + goto cleanup;
> + }
> +
> + if (VIR_ALLOC_N(list, n) < 0) {
> + virReportOOMError();
> + goto cleanup;
> + }
> +
> + for (i = 0 ; i < n ; i++) {
> + virJSONValuePtr child = virJSONValueArrayGet(data, i);
> + const char *tmp;
> +
> + if (!(tmp = virJSONValueGetString(child))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("%s array element does not contain data"),
> + qmpCmd);
> + goto cleanup;
> + }
> +
> + if (!(list[i] = strdup(tmp))) {
> + virReportOOMError();
> + goto cleanup;
> + }
> + }
> +
> + ret = n;
> + *array = list;
> +
> +cleanup:
> + if (ret < 0 && list) {
> + for (i = 0 ; i < n ; i++)
> + VIR_FREE(list[i]);
> + VIR_FREE(list);
> + }
> + virJSONValueFree(cmd);
> + virJSONValueFree(reply);
> + return ret;
> +}
> +
> +int qemuMonitorJSONGetTPMModels(qemuMonitorPtr mon,
> + char ***tpmmodels)
> +{
> + return qemuMonitorJSONGetStringArray(mon, "query-tpm-models", tpmmodels);
> +}
> +
> +
> +int qemuMonitorJSONGetTPMTypes(qemuMonitorPtr mon,
> + char ***tpmtypes)
> +{
> + return qemuMonitorJSONGetStringArray(mon, "query-tpm-types", tpmtypes);
> +}
> Index: libvirt/src/libvirt_private.syms
> ===================================================================
> --- libvirt.orig/src/libvirt_private.syms
> +++ libvirt/src/libvirt_private.syms
> @@ -1886,6 +1886,7 @@ virSetUIDGIDWithCaps;
> virSkipSpaces;
> virSkipSpacesAndBackslash;
> virSkipSpacesBackwards;
> +virStrArrayHasString;
> virStrcpy;
> virStrIsPrint;
> virStrncpy;
> Index: libvirt/src/util/virutil.c
> ===================================================================
> --- libvirt.orig/src/util/virutil.c
> +++ libvirt/src/util/virutil.c
> @@ -3379,3 +3379,17 @@ cleanup:
> VIR_FREE(buf);
> return ret;
> }
> +
> +
> +bool
> +virStrArrayHasString(char **strings, size_t n_strings, const char *needle)
> +{
> + size_t i;
> +
> + for (i = 0; i < n_strings; i++) {
> + if (STREQ(strings[i], needle))
> + return true;
> + }
> +
> + return false;
> +}
> Index: libvirt/src/util/virutil.h
> ===================================================================
> --- libvirt.orig/src/util/virutil.h
> +++ libvirt/src/util/virutil.h
> @@ -297,4 +297,7 @@ int virGetDeviceUnprivSGIO(const char *p
> char * virGetUnprivSGIOSysfsPath(const char *path,
> const char *sysfs_dir);
>
> +bool virStrArrayHasString(char **strings, size_t n_strings,
> + const char *needle);
> +
> #endif /* __VIR_UTIL_H__ */
The virStrArrayHasString method doesn't appear to be used in this patch.
If some other patch needs this still, then it should be a separate patch
from the monitor code.
Daniel
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