Re: [PATCH 1/2] qemu: Add UNDEFINE_TPM and UNDEFINE_KEEP_TPM flags

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On 8/23/22 18:28, Stefan Berger wrote:
> Add UNDEFINE_TPM and UNDEFINE_KEEP_TPM flags to qemuDomainUndefineFlags()
> API and --tpm and --keep-tpm to 'virsh undefine'. Pass the
> virDomainUndefineFlagsValues via qemuDomainRemoveInactive()
> from qemuDomainUndefineFlags() all the way down to
> qemuTPMEmulatorCleanupHost() and delete TPM storage there considering that
> the UNDEFINE_TPM flag has priority over the persistent_state attribute
> from the domain XML. Pass 0 in all other API call sites to
> qemuDomainRemoveInactive() for now.
> 
> Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> ---
>  include/libvirt/libvirt-domain.h |  6 ++++++
>  src/qemu/qemu_domain.c           | 12 +++++++-----
>  src/qemu/qemu_domain.h           |  3 ++-
>  src/qemu/qemu_driver.c           | 31 ++++++++++++++++++++-----------
>  src/qemu/qemu_extdevice.c        |  5 +++--
>  src/qemu/qemu_extdevice.h        |  3 ++-
>  src/qemu/qemu_migration.c        | 12 ++++++------
>  src/qemu/qemu_process.c          |  4 ++--
>  src/qemu/qemu_snapshot.c         |  4 ++--
>  src/qemu/qemu_tpm.c              | 14 ++++++++++----
>  src/qemu/qemu_tpm.h              |  3 ++-
>  tools/virsh-domain.c             | 15 +++++++++++++++
>  12 files changed, 77 insertions(+), 35 deletions(-)
> 
> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
> index 7430a08619..5f12c673d6 100644
> --- a/include/libvirt/libvirt-domain.h
> +++ b/include/libvirt/libvirt-domain.h
> @@ -2267,9 +2267,15 @@ typedef enum {
>      VIR_DOMAIN_UNDEFINE_CHECKPOINTS_METADATA = (1 << 4), /* If last use of domain,
>                                                              then also remove any
>                                                              checkpoint metadata (Since: 5.6.0) */
> +    VIR_DOMAIN_UNDEFINE_TPM                = (1 << 5), /* Also remove any
> +                                                          TPM state (Since: 8.8.0) */
> +    VIR_DOMAIN_UNDEFINE_KEEP_TPM           = (1 << 6), /* Keep TPM state (Since: 8.8.0) */
> +    VIR_DOMAIN_UNDEFINE_TPM_MASK           = (3 << 5), /* TPM flags mask (Since: 8.8.0) */

I believe this _MASK is not something we want to expose to users. It's
not like both _KEEP_TPM and _TPM can be passed at the same time.

> +    /* Future undefine control flags should come here. */
>  } virDomainUndefineFlagsValues;
>  
>  
> +
>  int                     virDomainUndefineFlags   (virDomainPtr domain,
>                                                    unsigned int flags);
>  int                     virConnectNumOfDefinedDomains  (virConnectPtr conn);
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index d5fef76211..47eabd0eec 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -7143,7 +7143,8 @@ qemuDomainSnapshotDiscardAllMetadata(virQEMUDriver *driver,
>  
>  static void
>  qemuDomainRemoveInactiveCommon(virQEMUDriver *driver,
> -                               virDomainObj *vm)
> +                               virDomainObj *vm,
> +                               virDomainUndefineFlagsValues flags)

I'd rather use unsigned int for flags. In the end,
qemuDomainUndefineFlags() uses uint and passes it to
qemuDomainRemoveInactive() so there's not much value in keeping the type.

>  {
>      g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
>      g_autofree char *snapDir = NULL;
> @@ -7169,7 +7170,7 @@ qemuDomainRemoveInactiveCommon(virQEMUDriver *driver,
>          if (rmdir(chkDir) < 0 && errno != ENOENT)
>              VIR_WARN("unable to remove checkpoint directory %s", chkDir);
>      }
> -    qemuExtDevicesCleanupHost(driver, vm->def);
> +    qemuExtDevicesCleanupHost(driver, vm->def, flags);
>  }
>  
>  
> @@ -7180,14 +7181,15 @@ qemuDomainRemoveInactiveCommon(virQEMUDriver *driver,
>   */
>  void
>  qemuDomainRemoveInactive(virQEMUDriver *driver,
> -                         virDomainObj *vm)
> +                         virDomainObj *vm,
> +                         virDomainUndefineFlagsValues flags)
>  {
>      if (vm->persistent) {
>          /* Short-circuit, we don't want to remove a persistent domain */
>          return;
>      }
>  
> -    qemuDomainRemoveInactiveCommon(driver, vm);
> +    qemuDomainRemoveInactiveCommon(driver, vm, flags);
>  
>      virDomainObjListRemove(driver->domains, vm);
>  }
> @@ -7209,7 +7211,7 @@ qemuDomainRemoveInactiveLocked(virQEMUDriver *driver,
>          return;
>      }
>  
> -    qemuDomainRemoveInactiveCommon(driver, vm);
> +    qemuDomainRemoveInactiveCommon(driver, vm, 0);
>  
>      virDomainObjListRemoveLocked(driver->domains, vm);
>  }
> diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
> index 592ee9805b..6322cfa739 100644
> --- a/src/qemu/qemu_domain.h
> +++ b/src/qemu/qemu_domain.h
> @@ -683,7 +683,8 @@ int qemuDomainSnapshotDiscardAllMetadata(virQEMUDriver *driver,
>                                           virDomainObj *vm);
>  
>  void qemuDomainRemoveInactive(virQEMUDriver *driver,
> -                              virDomainObj *vm);
> +                              virDomainObj *vm,
> +                              virDomainUndefineFlagsValues flags);
>  
>  void
>  qemuDomainRemoveInactiveLocked(virQEMUDriver *driver,
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 707f4cc1bb..3e0c693db1 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -1624,7 +1624,7 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
>          goto cleanup;
>  
>      if (qemuProcessBeginJob(vm, VIR_DOMAIN_JOB_OPERATION_START, flags) < 0) {
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>          goto cleanup;
>      }
>  
> @@ -1633,7 +1633,7 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
>                           VIR_NETDEV_VPORT_PROFILE_OP_CREATE,
>                           start_flags) < 0) {
>          virDomainAuditStart(vm, "booted", false);
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>          qemuProcessEndJob(vm);
>          goto cleanup;
>      }
> @@ -2119,7 +2119,7 @@ qemuDomainDestroyFlags(virDomainPtr dom,
>      ret = 0;
>   endjob:
>      if (ret == 0)
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>      qemuDomainObjEndJob(vm);
>  
>   cleanup:
> @@ -2738,7 +2738,7 @@ qemuDomainSaveInternal(virQEMUDriver *driver,
>      }
>      qemuDomainObjEndAsyncJob(vm);
>      if (ret == 0)
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  
>   cleanup:
>      virQEMUSaveDataFree(data);
> @@ -3279,7 +3279,7 @@ qemuDomainCoreDumpWithFormat(virDomainPtr dom,
>  
>      qemuDomainObjEndAsyncJob(vm);
>      if (ret == 0 && flags & VIR_DUMP_CRASH)
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  
>   cleanup:
>      virDomainObjEndAPI(&vm);
> @@ -3591,7 +3591,7 @@ processGuestPanicEvent(virQEMUDriver *driver,
>   endjob:
>      qemuDomainObjEndAsyncJob(vm);
>      if (removeInactive)
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  }
>  
>  
> @@ -4069,7 +4069,7 @@ processMonitorEOFEvent(virQEMUDriver *driver,
>      virObjectEventStateQueue(driver->domainEventState, event);
>  
>   endjob:
> -    qemuDomainRemoveInactive(driver, vm);
> +    qemuDomainRemoveInactive(driver, vm, 0);
>      qemuDomainObjEndJob(vm);
>  }
>  
> @@ -5999,7 +5999,7 @@ qemuDomainRestoreInternal(virConnectPtr conn,
>      virFileWrapperFdFree(wrapperFd);
>      virQEMUSaveDataFree(data);
>      if (vm && ret < 0)
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>      virDomainObjEndAPI(&vm);
>      return ret;
>  }
> @@ -6690,7 +6690,7 @@ qemuDomainDefineXMLFlags(virConnectPtr conn,
>          } else {
>              /* Brand new domain. Remove it */
>              VIR_INFO("Deleting domain '%s'", vm->def->name);
> -            qemuDomainRemoveInactive(driver, vm);
> +            qemuDomainRemoveInactive(driver, vm, 0);
>          }
>      }
>  
> @@ -6723,7 +6723,9 @@ qemuDomainUndefineFlags(virDomainPtr dom,
>                    VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA |
>                    VIR_DOMAIN_UNDEFINE_CHECKPOINTS_METADATA |
>                    VIR_DOMAIN_UNDEFINE_NVRAM |
> -                  VIR_DOMAIN_UNDEFINE_KEEP_NVRAM, -1);
> +                  VIR_DOMAIN_UNDEFINE_KEEP_NVRAM |
> +                  VIR_DOMAIN_UNDEFINE_TPM |
> +                  VIR_DOMAIN_UNDEFINE_KEEP_TPM, -1);
>  
>      if ((flags & VIR_DOMAIN_UNDEFINE_NVRAM) &&
>          (flags & VIR_DOMAIN_UNDEFINE_KEEP_NVRAM)) {
> @@ -6732,6 +6734,13 @@ qemuDomainUndefineFlags(virDomainPtr dom,
>          return -1;
>      }
>  
> +    if ((flags & VIR_DOMAIN_UNDEFINE_TPM) &&
> +        (flags & VIR_DOMAIN_UNDEFINE_KEEP_TPM)) {
> +        virReportError(VIR_ERR_OPERATION_INVALID,
> +                       "%s", _("cannot both keep and delete TPM"));
> +        return -1;
> +    }
> +
>      if (!(vm = qemuDomainObjFromDomain(dom)))
>          return -1;
>  
> @@ -6830,7 +6839,7 @@ qemuDomainUndefineFlags(virDomainPtr dom,
>       */
>      vm->persistent = 0;
>      if (!virDomainObjIsActive(vm))
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, flags);
>  
>      ret = 0;
>   endjob:
> diff --git a/src/qemu/qemu_extdevice.c b/src/qemu/qemu_extdevice.c
> index b8e3c1000a..24a57b0f74 100644
> --- a/src/qemu/qemu_extdevice.c
> +++ b/src/qemu/qemu_extdevice.c
> @@ -151,7 +151,8 @@ qemuExtDevicesPrepareHost(virQEMUDriver *driver,
>  
>  void
>  qemuExtDevicesCleanupHost(virQEMUDriver *driver,
> -                          virDomainDef *def)
> +                          virDomainDef *def,
> +                          virDomainUndefineFlagsValues flags)
>  {
>      size_t i;
>  
> @@ -159,7 +160,7 @@ qemuExtDevicesCleanupHost(virQEMUDriver *driver,
>          return;
>  
>      for (i = 0; i < def->ntpms; i++) {
> -        qemuExtTPMCleanupHost(def->tpms[i]);
> +        qemuExtTPMCleanupHost(def->tpms[i], flags);
>      }
>  }
>  
> diff --git a/src/qemu/qemu_extdevice.h b/src/qemu/qemu_extdevice.h
> index 43d2a4dfff..6b05b59cd6 100644
> --- a/src/qemu/qemu_extdevice.h
> +++ b/src/qemu/qemu_extdevice.h
> @@ -41,7 +41,8 @@ int qemuExtDevicesPrepareHost(virQEMUDriver *driver,
>      G_GNUC_WARN_UNUSED_RESULT;
>  
>  void qemuExtDevicesCleanupHost(virQEMUDriver *driver,
> -                               virDomainDef *def)
> +                               virDomainDef *def,
> +                               virDomainUndefineFlagsValues flags)
>      ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
>  
>  int qemuExtDevicesStart(virQEMUDriver *driver,
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index b3b25d78b4..7f69991e2b 100644
> --- a/src/qemu/qemu_migration.c
> +++ b/src/qemu/qemu_migration.c
> @@ -3408,7 +3408,7 @@ qemuMigrationDstPrepareFresh(virQEMUDriver *driver,
>           * and there is no 'goto cleanup;' in the middle of those */
>          VIR_FREE(priv->origname);
>          virDomainObjRemoveTransientDef(vm);
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>      }
>      virDomainObjEndAPI(&vm);
>      virErrorRestore(&origErr);
> @@ -4054,7 +4054,7 @@ qemuMigrationSrcConfirm(virQEMUDriver *driver,
>              virDomainDeleteConfig(cfg->configDir, cfg->autostartDir, vm);
>              vm->persistent = 0;
>          }
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>      }
>  
>   cleanup:
> @@ -6003,7 +6003,7 @@ qemuMigrationSrcPerformJob(virQEMUDriver *driver,
>              virDomainDeleteConfig(cfg->configDir, cfg->autostartDir, vm);
>              vm->persistent = 0;
>          }
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>      }
>  
>      virErrorRestore(&orig_err);
> @@ -6130,7 +6130,7 @@ qemuMigrationSrcPerformPhase(virQEMUDriver *driver,
>      }
>  
>      if (!virDomainObjIsActive(vm))
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  
>      return ret;
>  }
> @@ -6667,7 +6667,7 @@ qemuMigrationDstFinishActive(virQEMUDriver *driver,
>      }
>  
>      if (!virDomainObjIsActive(vm))
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  
>      virErrorRestore(&orig_err);
>      return NULL;
> @@ -6805,7 +6805,7 @@ qemuMigrationProcessUnattended(virQEMUDriver *driver,
>      qemuMigrationJobFinish(vm);
>  
>      if (!virDomainObjIsActive(vm))
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>  }
>  
>  
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index 5c8413a6b6..1073fc5ed5 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -8460,7 +8460,7 @@ qemuProcessAutoDestroy(virDomainObj *dom,
>                                       VIR_DOMAIN_EVENT_STOPPED,
>                                       VIR_DOMAIN_EVENT_STOPPED_DESTROYED);
>  
> -    qemuDomainRemoveInactive(driver, dom);
> +    qemuDomainRemoveInactive(driver, dom, 0);
>  
>      qemuDomainObjEndJob(dom);
>  
> @@ -8926,7 +8926,7 @@ qemuProcessReconnect(void *opaque)
>      if (jobStarted)
>          qemuDomainObjEndJob(obj);
>      if (!virDomainObjIsActive(obj))
> -        qemuDomainRemoveInactive(driver, obj);
> +        qemuDomainRemoveInactive(driver, obj, 0);
>      virDomainObjEndAPI(&obj);
>      virIdentitySetCurrent(NULL);
>      return;
> diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
> index 6033deafed..433f3ab2c5 100644
> --- a/src/qemu/qemu_snapshot.c
> +++ b/src/qemu/qemu_snapshot.c
> @@ -2103,7 +2103,7 @@ qemuSnapshotRevertInactive(virDomainObj *vm,
>      }
>  
>      if (qemuSnapshotInternalRevertInactive(driver, vm, snap) < 0) {
> -        qemuDomainRemoveInactive(driver, vm);
> +        qemuDomainRemoveInactive(driver, vm, 0);
>          return -1;
>      }
>  
> @@ -2125,7 +2125,7 @@ qemuSnapshotRevertInactive(virDomainObj *vm,
>                                start_flags);
>          virDomainAuditStart(vm, "from-snapshot", rc >= 0);
>          if (rc < 0) {
> -            qemuDomainRemoveInactive(driver, vm);
> +            qemuDomainRemoveInactive(driver, vm, 0);
>              return -1;
>          }
>          detail = VIR_DOMAIN_EVENT_STARTED_FROM_SNAPSHOT;
> diff --git a/src/qemu/qemu_tpm.c b/src/qemu/qemu_tpm.c
> index d0aed7fa2e..c5e1e39961 100644
> --- a/src/qemu/qemu_tpm.c
> +++ b/src/qemu/qemu_tpm.c
> @@ -697,10 +697,15 @@ qemuTPMEmulatorInitPaths(virDomainTPMDef *tpm,
>   * Clean up persistent storage for the swtpm.
>   */
>  static void
> -qemuTPMEmulatorCleanupHost(virDomainTPMDef *tpm)
> +qemuTPMEmulatorCleanupHost(virDomainTPMDef *tpm,
> +                           virDomainUndefineFlagsValues flags)
>  {
> -    if (!tpm->data.emulator.persistent_state)
> +    if (flags == VIR_DOMAIN_UNDEFINE_TPM) {

Surely you want a bit test here.

>          qemuTPMEmulatorDeleteStorage(tpm);
> +    } else if (!tpm->data.emulator.persistent_state &&
> +             (flags & VIR_DOMAIN_UNDEFINE_TPM_MASK) == 0) {
> +        qemuTPMEmulatorDeleteStorage(tpm);

Here, we should do something similar to NVRAM: fail if the storage
exists and KEEP_TPM wasn't specified. Which is going to break existing
workloads where undefine worked even without the flag. So maybe just
need this?

    if ((tpm->data.emulator.persistent_state && flags &
VIR_DOMAIN_UNDEFINE_TPM) ||
        !tpm->data.emulator.persistent_state && !(flags &
VIR_DOMAIN_UNDEFINE_KEEP_TPM)) {
        qemuTPMEmulatorDeleteStorage(tpm);
    }


> +    }
>  }
>  
>  
> @@ -993,9 +998,10 @@ qemuExtTPMPrepareHost(virQEMUDriver *driver,
>  
>  
>  void
> -qemuExtTPMCleanupHost(virDomainTPMDef *tpm)
> +qemuExtTPMCleanupHost(virDomainTPMDef *tpm,
> +                      virDomainUndefineFlagsValues flags)
>  {
> -    qemuTPMEmulatorCleanupHost(tpm);
> +    qemuTPMEmulatorCleanupHost(tpm, flags);
>  }
>  
>  
> diff --git a/src/qemu/qemu_tpm.h b/src/qemu/qemu_tpm.h
> index 9951f025a6..f068f3ca5a 100644
> --- a/src/qemu/qemu_tpm.h
> +++ b/src/qemu/qemu_tpm.h
> @@ -35,7 +35,8 @@ int qemuExtTPMPrepareHost(virQEMUDriver *driver,
>      ATTRIBUTE_NONNULL(3)
>      G_GNUC_WARN_UNUSED_RESULT;
>  
> -void qemuExtTPMCleanupHost(virDomainTPMDef *tpm)
> +void qemuExtTPMCleanupHost(virDomainTPMDef *tpm,
> +                           virDomainUndefineFlagsValues flags)
>      ATTRIBUTE_NONNULL(1);
>  
>  int qemuExtTPMStart(virQEMUDriver *driver,
> diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
> index d2ea4d1c7b..ff9c081d71 100644
> --- a/tools/virsh-domain.c
> +++ b/tools/virsh-domain.c
> @@ -3650,6 +3650,14 @@ static const vshCmdOptDef opts_undefine[] = {
>       .type = VSH_OT_BOOL,
>       .help = N_("keep nvram file")
>      },
> +    {.name = "tpm",
> +     .type = VSH_OT_BOOL,
> +     .help = N_("remove TPM state")
> +    },
> +    {.name = "keep-tpm",
> +     .type = VSH_OT_BOOL,
> +     .help = N_("keep TPM state")
> +    },

These new arguments should be documented in virsh manpage.

Michal




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