On 2/8/22 06:21, Haibin Huang wrote:
> QEMU version >= 6.2.0 provides support for creating enclave on
> SGX x86 platform using Software Guard Extensions (SGX) feature.
> This patch adds support to query the SGX capability from the qemu.
>
> Signed-off-by: Haibin Huang <[email protected]>
> ---
> src/conf/domain_capabilities.c | 10 ++
> src/conf/domain_capabilities.h | 13 ++
> src/libvirt_private.syms | 1 +
> src/qemu/qemu_capabilities.c | 113 ++++++++++++++++++
> src/qemu/qemu_capabilities.h | 4 +
> src/qemu/qemu_capspriv.h | 4 +
> src/qemu/qemu_monitor.c | 10 ++
> src/qemu/qemu_monitor.h | 3 +
> src/qemu/qemu_monitor_json.c | 72 +++++++++++
> src/qemu/qemu_monitor_json.h | 9 ++
> .../caps_6.2.0.x86_64.replies | 22 +++-
> .../caps_6.2.0.x86_64.xml | 5 +
> .../caps_7.0.0.x86_64.replies | 22 +++-
> .../caps_7.0.0.x86_64.xml | 5 +
> 14 files changed, 285 insertions(+), 8 deletions(-)
>
> diff --git a/src/conf/domain_capabilities.c b/src/conf/domain_capabilities.c
> index c394a7a390..1170fd26df 100644
> --- a/src/conf/domain_capabilities.c
> +++ b/src/conf/domain_capabilities.c
> @@ -78,6 +78,16 @@ virSEVCapabilitiesFree(virSEVCapability *cap)
> }
>
>
> +void
> +virSGXCapabilitiesFree(virSGXCapability *cap)
> +{
> + if (!cap)
> + return;
> +
> + VIR_FREE(cap);
> +}
> +
> +
> static void
> virDomainCapsDispose(void *obj)
> {
> diff --git a/src/conf/domain_capabilities.h b/src/conf/domain_capabilities.h
> index 1d2f4ac7a5..973d543ce8 100644
> --- a/src/conf/domain_capabilities.h
> +++ b/src/conf/domain_capabilities.h
> @@ -191,6 +191,13 @@ struct _virSEVCapability {
> unsigned int max_es_guests;
> };
>
> +typedef struct _virSGXCapability virSGXCapability;
> +typedef virSGXCapability *virSGXCapabilityPtr;
> +struct _virSGXCapability {
> + bool flc;
> + unsigned int epc_size;
> +};
> +
> typedef enum {
> VIR_DOMAIN_CAPS_FEATURE_IOTHREADS = 0,
> VIR_DOMAIN_CAPS_FEATURE_VMCOREINFO,
> @@ -227,6 +234,7 @@ struct _virDomainCaps {
>
> virDomainCapsFeatureGIC gic;
> virSEVCapability *sev;
> + virSGXCapability *sgx;
> /* add new domain features here */
>
> virTristateBool features[VIR_DOMAIN_CAPS_FEATURE_LAST];
> @@ -275,3 +283,8 @@ void
> virSEVCapabilitiesFree(virSEVCapability *capabilities);
>
> G_DEFINE_AUTOPTR_CLEANUP_FUNC(virSEVCapability, virSEVCapabilitiesFree);
> +
> +void
> +virSGXCapabilitiesFree(virSGXCapability *capabilities);
> +
> +G_DEFINE_AUTOPTR_CLEANUP_FUNC(virSGXCapability, virSGXCapabilitiesFree);
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index ba3462d849..0e74e4f20e 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -219,6 +219,7 @@ virDomainCapsEnumSet;
> virDomainCapsFormat;
> virDomainCapsNew;
> virSEVCapabilitiesFree;
> +virSGXCapabilitiesFree;
>
>
> # conf/domain_conf.h
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index 1b28c3f161..0e43dd2466 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -663,6 +663,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
> "device.json+hotplug", /* QEMU_CAPS_DEVICE_JSON */
> "hvf", /* QEMU_CAPS_HVF */
> "virtio-mem-pci.prealloc", /*
> QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_PREALLOC */
> + "sgx-epc", /* QEMU_CAPS_SGX_EPC */
> );
>
>
> @@ -744,6 +745,8 @@ struct _virQEMUCaps {
>
> virSEVCapability *sevCapabilities;
>
> + virSGXCapability *sgxCapabilities;
> +
> /* Capabilities which may differ depending on the accelerator. */
> virQEMUCapsAccel kvm;
> virQEMUCapsAccel hvf;
> @@ -1398,6 +1401,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[]
> = {
> { "virtio-vga-gl", QEMU_CAPS_VIRTIO_VGA_GL },
> { "s390-pv-guest", QEMU_CAPS_S390_PV_GUEST },
> { "virtio-mem-pci", QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI },
> + { "sgx-epc", QEMU_CAPS_SGX_EPC },
> };
>
>
> @@ -1962,6 +1966,22 @@ virQEMUCapsSEVInfoCopy(virSEVCapability **dst,
> }
>
>
> +static int
> +virQEMUCapsSGXInfoCopy(virSGXCapabilityPtr *dst,
> + virSGXCapabilityPtr src)
> +{
> + g_autoptr(virSGXCapability) tmp = NULL;
> +
> + tmp = g_new0(virSGXCapability, 1);
> +
> + tmp->flc = src->flc;
> + tmp->epc_size = src->epc_size;
> +
> + *dst = g_steal_pointer(&tmp);
> + return 0;
> +}
> +
> +
> static void
> virQEMUCapsAccelCopyMachineTypes(virQEMUCapsAccel *dst,
> virQEMUCapsAccel *src)
> @@ -2043,6 +2063,12 @@ virQEMUCaps *virQEMUCapsNewCopy(virQEMUCaps *qemuCaps)
> qemuCaps->sevCapabilities) < 0)
> return NULL;
>
> +
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SGX_EPC) &&
> + virQEMUCapsSGXInfoCopy(&ret->sgxCapabilities,
> + qemuCaps->sgxCapabilities) < 0)
> + return NULL;
> +
> return g_steal_pointer(&ret);
> }
>
> @@ -2606,6 +2632,13 @@ virQEMUCapsGetSEVCapabilities(virQEMUCaps *qemuCaps)
> }
>
>
> +virSGXCapabilityPtr
> +virQEMUCapsGetSGXCapabilities(virQEMUCaps *qemuCaps)
> +{
> + return qemuCaps->sgxCapabilities;
> +}
> +
> +
> static int
> virQEMUCapsProbeQMPCommands(virQEMUCaps *qemuCaps,
> qemuMonitor *mon)
> @@ -3441,6 +3474,31 @@ virQEMUCapsProbeQMPSEVCapabilities(virQEMUCaps
> *qemuCaps,
> }
>
>
> +static int
> +virQEMUCapsProbeQMPSGXCapabilities(virQEMUCaps *qemuCaps,
> + qemuMonitor *mon)
> +{
> + int rc = -1;
> + virSGXCapability *caps = NULL;
> +
> + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SGX_EPC))
> + return 0;
> +
> + if ((rc = qemuMonitorGetSGXCapabilities(mon, &caps)) < 0)
> + return -1;
> +
> + /* SGX isn't actually supported */
> + if (rc == 0) {
> + virQEMUCapsClear(qemuCaps, QEMU_CAPS_SGX_EPC);
> + return 0;
> + }
> +
> + virSGXCapabilitiesFree(qemuCaps->sgxCapabilities);
> + qemuCaps->sgxCapabilities = caps;
> + return 0;
> +}
> +
> +
> /*
> * Filter for features which should never be passed to QEMU. Either because
> * QEMU never supported them or they were dropped as they never did anything
> @@ -4219,6 +4277,39 @@ virQEMUCapsParseSEVInfo(virQEMUCaps *qemuCaps,
> xmlXPathContextPtr ctxt)
> }
>
>
> +static int
> +virQEMUCapsParseSGXInfo(virQEMUCaps *qemuCaps, xmlXPathContextPtr ctxt)
We like one argument per line.
> +{
> + g_autoptr(virSGXCapability) sgx = NULL;
> +
> + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SGX_EPC))
> + return 0;
> +
> + if (virXPathBoolean("boolean(./sgx)", ctxt) == 0) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("missing SGX platform data in QEMU capabilities
> cache"));
> + return -1;
> + }
> +
> + sgx = g_new0(virSGXCapability, 1);
> +
> + if (virXPathBoolean("boolean(./sgx/flc)", ctxt) == 0) {
This only checks whether <flc/> element exists and not its value, ...
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("missing SGX platform flc in QEMU capabilities
> cache"));
> + return -1;
> + }
> +
> + if (virXPathUInt("string(./sgx/epc_size)", ctxt, &sgx->epc_size) < 0) {
> + virReportError(VIR_ERR_XML_ERROR, "%s",
> + _("missing or malformed SGX platform epc_size in QEMU
> capabilities cache"));
> + return -1;
> + }
> +
> + qemuCaps->sgxCapabilities = g_steal_pointer(&sgx);
> + return 0;
> +}
> +
> +
> static int
> virQEMUCapsParseFlags(virQEMUCaps *qemuCaps, xmlXPathContextPtr ctxt)
> {
> @@ -4521,6 +4612,9 @@ virQEMUCapsLoadCache(virArch hostArch,
> if (virQEMUCapsParseSEVInfo(qemuCaps, ctxt) < 0)
> return -1;
>
> + if (virQEMUCapsParseSGXInfo(qemuCaps, ctxt) < 0)
> + return -1;
> +
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
> virQEMUCapsInitHostCPUModel(qemuCaps, hostArch, VIR_DOMAIN_VIRT_KVM);
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_HVF))
> @@ -4701,6 +4795,20 @@ virQEMUCapsFormatSEVInfo(virQEMUCaps *qemuCaps,
> virBuffer *buf)
> }
>
>
> +static void
> +virQEMUCapsFormatSGXInfo(virQEMUCaps *qemuCaps, virBuffer *buf)
> +{
> + virSGXCapabilityPtr sgx = virQEMUCapsGetSGXCapabilities(qemuCaps);
> +
> + virBufferAddLit(buf, "<sgx>\n");
> + virBufferAdjustIndent(buf, 2);
> + virBufferAsprintf(buf, "<flc>%s</flc>\n", sgx->flc ? "yes" : "no");
... which is in contradiction with the way we format it.
> + virBufferAsprintf(buf, "<epc_size>%u</epc_size>\n", sgx->epc_size);
> + virBufferAdjustIndent(buf, -2);
> + virBufferAddLit(buf, "</sgx>\n");
> +}
> +
> +
> char *
> virQEMUCapsFormatCache(virQEMUCaps *qemuCaps)
> {
> @@ -4782,6 +4890,9 @@ virQEMUCapsFormatCache(virQEMUCaps *qemuCaps)
> if (qemuCaps->sevCapabilities)
> virQEMUCapsFormatSEVInfo(qemuCaps, &buf);
>
> + if (qemuCaps->sgxCapabilities)
> + virQEMUCapsFormatSGXInfo(qemuCaps, &buf);
> +
> if (qemuCaps->kvmSupportsNesting)
> virBufferAddLit(&buf, "<kvmSupportsNesting/>\n");
>
> @@ -5466,6 +5577,8 @@ virQEMUCapsInitQMPMonitor(virQEMUCaps *qemuCaps,
> return -1;
> if (virQEMUCapsProbeQMPSEVCapabilities(qemuCaps, mon) < 0)
> return -1;
> + if (virQEMUCapsProbeQMPSGXCapabilities(qemuCaps, mon) < 0)
> + return -1;
>
> virQEMUCapsInitProcessCaps(qemuCaps);
>
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index 6ff0b7a78b..a630676d6c 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -638,6 +638,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for
> syntax-check */
> QEMU_CAPS_DEVICE_JSON, /* -device accepts JSON (and works with
> hot-unplug) */
> QEMU_CAPS_HVF, /* Whether Hypervisor.framework is available */
> QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_PREALLOC, /* -device
> virtio-mem-pci.prealloc= */
> + QEMU_CAPS_SGX_EPC, /* -object sgx-epc,... */
>
> QEMU_CAPS_LAST /* this must always be the last item */
> } virQEMUCapsFlags;
> @@ -831,6 +832,9 @@ virQEMUCapsCPUFeatureFromQEMU(virQEMUCaps *qemuCaps,
> virSEVCapability *
> virQEMUCapsGetSEVCapabilities(virQEMUCaps *qemuCaps);
>
> +virSGXCapabilityPtr
> +virQEMUCapsGetSGXCapabilities(virQEMUCaps *qemuCaps);
> +
> bool
> virQEMUCapsGetKVMSupportsSecureGuest(virQEMUCaps *qemuCaps) G_GNUC_NO_INLINE;
>
> diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h
> index f4f4a99d32..c632647a74 100644
> --- a/src/qemu/qemu_capspriv.h
> +++ b/src/qemu/qemu_capspriv.h
> @@ -101,6 +101,10 @@ void
> virQEMUCapsSetSEVCapabilities(virQEMUCaps *qemuCaps,
> virSEVCapability *capabilities);
>
> +void
> +virQEMUCapsSetSGXCapabilities(virQEMUCaps *qemuCaps,
> + virSGXCapability *capabilities);
> +
> int
> virQEMUCapsProbeCPUDefinitionsTest(virQEMUCaps *qemuCaps,
> qemuMonitor *mon);
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index babf9e62fb..c54cca2406 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -3719,6 +3719,16 @@ qemuMonitorGetSEVCapabilities(qemuMonitor *mon,
> }
>
>
> +int
> +qemuMonitorGetSGXCapabilities(qemuMonitor *mon,
> + virSGXCapability **capabilities)
> +{
> + QEMU_CHECK_MONITOR(mon);
> +
> + return qemuMonitorJSONGetSGXCapabilities(mon, capabilities);
> +}
> +
> +
> int
> qemuMonitorNBDServerStart(qemuMonitor *mon,
> const virStorageNetHostDef *server,
> diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
> index 9b2e4e1421..4e85dcb548 100644
> --- a/src/qemu/qemu_monitor.h
> +++ b/src/qemu/qemu_monitor.h
> @@ -920,6 +920,9 @@ int qemuMonitorGetGICCapabilities(qemuMonitor *mon,
> int qemuMonitorGetSEVCapabilities(qemuMonitor *mon,
> virSEVCapability **capabilities);
>
> +int qemuMonitorGetSGXCapabilities(qemuMonitor *mon,
> + virSGXCapability **capabilities);
> +
> typedef enum {
> QEMU_MONITOR_MIGRATE_BACKGROUND = 1 << 0,
> QEMU_MONITOR_MIGRATE_NON_SHARED_DISK = 1 << 1, /* migration with
> non-shared storage with full disk copy */
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index b0b513683b..811db233c4 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -6493,6 +6493,78 @@ qemuMonitorJSONGetSEVCapabilities(qemuMonitor *mon,
> return 1;
> }
>
> +/**
> + * qemuMonitorJSONGetSGXCapabilities:
> + * @mon: qemu monitor object
> + * @capabilities: pointer to pointer to a SGX capability structure to be
> filled
> + *
> + * This function queries and fills in INTEL's SGX platform-specific data.
> + * Note that from QEMU's POV both -object sgx-epc and query-sgx-capabilities
> + * can be present even if SGX is not available, which basically leaves us
> with
> + * checking for JSON "GenericError" in order to differentiate between
> compiled-in
> + * support and actual SGX support on the platform.
> + *
> + * Returns -1 on error, 0 if SGX is not supported, and 1 if SGX is supported
> on
> + * the platform.
> + */
> +int
> +qemuMonitorJSONGetSGXCapabilities(qemuMonitor *mon,
> + virSGXCapability **capabilities)
> +{
> + int ret = -1;
This variable is pretty useles, because ...
> + g_autoptr(virJSONValue) cmd = NULL;
> + g_autoptr(virJSONValue) reply = NULL;
> + virJSONValue *caps;
> + bool flc = false;
> + unsigned int section_size = 0;
> + g_autoptr(virSGXCapability) capability = NULL;
> +
> + *capabilities = NULL;
> +
> + if (!(cmd = qemuMonitorJSONMakeCommand("query-sgx-capabilities", NULL)))
> + return -1;
> +
> + if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
> + goto cleanup;
> +
> + /* QEMU has only compiled-in support of SGX */
> + if (qemuMonitorJSONHasError(reply, "GenericError")) {
> + ret = 0;
> + goto cleanup;
> + }
> +
> + if (qemuMonitorJSONCheckError(cmd, reply) < 0)
> + goto cleanup;
> +
> + caps = virJSONValueObjectGetObject(reply, "return");
> +
> + if (virJSONValueObjectGetBoolean(caps, "flc", &flc) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("query-sgx-capabilities reply was missing"
> + " 'flc' field"));
> + goto cleanup;
> + }
> +
> + if (virJSONValueObjectGetNumberUint(caps, "section-size", §ion_size)
> < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("query-sgx-capabilities reply was missing"
> + " 'section-size' field"));
> + goto cleanup;
> + }
> +
> + capability = g_new0(virSGXCapability, 1);
> +
> + capability->flc = flc;
> +
> + capability->epc_size = section_size/1024;
> + *capabilities = g_steal_pointer(&capability);
> + ret = 1;
> +
> + cleanup:
> +
> + return ret;
... this label is pretty much useless. s/goto cleanup/return -1/ for the
whole function, except for that one case where return 0 is needed.
> +}
> +
Michal
