[libvirt][PATCH v8 4/5] qemu: Add command-line to generate SGX EPC memory backend

[Ani Sinha]

SOB is missing in this patch.

On Tue, Dec 14, 2021 at 9:16 AM Haibin Huang <haibin.huang at intel.com> wrote:
>
> From: Lin Yang <lin.a.yang at intel.com>
>
> According to the result parsing from xml, add the argument of
> SGX EPC memory backend into QEMU command line:
>
>     #qemu-system-x86_64 \
>         ...... \
>         -object memory-backend-epc,id=mem1,size=64M,prealloc=on \
>         -object memory-backend-epc,id=mem2,size=28M \
>         -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2
> ---
>  src/qemu/qemu_alias.c   |  3 ++-
>  src/qemu/qemu_command.c | 40 ++++++++++++++++++++++++++++++++++++----
>  src/qemu/qemu_domain.c  | 10 +++++++++-
>  3 files changed, 47 insertions(+), 6 deletions(-)
>
> diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c
> index 5795924754..89afea8778 100644
> --- a/src/qemu/qemu_alias.c
> +++ b/src/qemu/qemu_alias.c
> @@ -489,7 +489,8 @@ qemuDeviceMemoryGetAliasID(virDomainDef *def,
>       * valid */
>      if (!oldAlias &&
>          mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM &&
> -        mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM)
> +        mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM &&
> +        mem->model != VIR_DOMAIN_MEMORY_MODEL_SGX_EPC)
>          return mem->info.addr.dimm.slot;
>
>      for (i = 0; i < def->nmems; i++) {
> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 36281a69e2..ebb3aa1023 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -3555,6 +3555,10 @@ qemuBuildMemoryBackendProps(virJSONValue **backendProps,
>          if (systemMemory)
>              disableCanonicalPath = true;
>
> +    } else if (mem->model == VIR_DOMAIN_MEMORY_MODEL_SGX_EPC) {
> +        backendType = "memory-backend-epc";
> +        if (!priv->memPrealloc)
> +            prealloc = true;
>      } else {
>          backendType = "memory-backend-ram";
>      }
> @@ -7838,6 +7842,8 @@ qemuBuildMemoryDeviceCommandLine(virCommand *cmd,
>                                   qemuDomainObjPrivate *priv)
>  {
>      size_t i;
> +    g_auto(virBuffer) epcBuf = VIR_BUFFER_INITIALIZER;
> +    int epcNum = 0;
>
>      /* memory hotplug requires NUMA to be enabled - we already checked
>       * that memory devices are present only when NUMA is */
> @@ -7847,11 +7853,37 @@ qemuBuildMemoryDeviceCommandLine(virCommand *cmd,
>          if (qemuBuildMemoryDimmBackendStr(cmd, def->mems[i], def, cfg, priv) < 0)
>              return -1;
>
> -        if (!(props = qemuBuildMemoryDeviceProps(def, def->mems[i])))
> -            return -1;
> +        switch ((virDomainMemoryModel) def->mems[i]->model) {
> +        case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
> +        case VIR_DOMAIN_MEMORY_MODEL_DIMM:
> +        case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM:
> +        case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM:
> +            if (!(props = qemuBuildMemoryDeviceProps(def, def->mems[i])))
> +                return -1;
>
> -        if (qemuBuildDeviceCommandlineFromJSON(cmd, props, priv->qemuCaps) < 0)
> -            return -1;
> +            if (qemuBuildDeviceCommandlineFromJSON(cmd, props, priv->qemuCaps) < 0)
> +                return -1;
> +
> +            break;
> +
> +        case VIR_DOMAIN_MEMORY_MODEL_SGX_EPC:
> +            if (virBufferUse(&epcBuf) > 0)
> +                virBufferAddChar(&epcBuf, ',');
> +
> +            virBufferAsprintf(&epcBuf, "sgx-epc.%d.memdev=%s", epcNum++,
> +                              g_strdup_printf("mem%s", def->mems[i]->info.alias));
> +
> +            break;
> +
> +        case VIR_DOMAIN_MEMORY_MODEL_NONE:
> +        case VIR_DOMAIN_MEMORY_MODEL_LAST:
> +            break;
> +        }
> +    }
> +
> +    if (virBufferUse(&epcBuf) > 0) {
> +        virCommandAddArg(cmd, "-M");
> +        virCommandAddArgBuffer(cmd, &epcBuf);
>      }
>
>      return 0;
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index f156d073e5..2db479ee7f 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -8895,13 +8895,21 @@ int
>  qemuDomainDefValidateMemoryHotplug(const virDomainDef *def,
>                                     const virDomainMemoryDef *mem)
>  {
> -    unsigned int nmems = def->nmems;
> +    unsigned int nmems = 0;
>      unsigned long long hotplugSpace;
>      unsigned long long hotplugMemory = 0;
>      size_t i;
>
>      hotplugSpace = def->mem.max_memory - virDomainDefGetMemoryInitial(def);
>
> +    for (i = 0; i < def->nmems; i++) {
> +        if (def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_DIMM ||
> +            def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM ||
> +            def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM ||
> +            def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM)
> +            nmems++;
> +    }
> +
>      if (mem) {
>          nmems++;
>          hotplugMemory = mem->size;
> --
> 2.17.1
>