[libvirt] [PATCH v2 1/9] qemu: provide support to query the SEV capability
Daniel P. Berrangé
berrange at redhat.com
Mon Mar 12 13:31:23 UTC 2018
On Thu, Mar 08, 2018 at 11:12:00AM -0600, Brijesh Singh wrote:
> QEMU version >= 2.12 provides support for launching an encrypted VMs on
> AMD x86 platform using Secure Encrypted Virtualization (SEV) feature.
> This patch adds support to query the SEV capability from the qemu.
>
> Signed-off-by: Brijesh Singh <brijesh.singh at amd.com>
> ---
> src/conf/domain_capabilities.h | 13 ++++++++
> src/qemu/qemu_capabilities.c | 43 +++++++++++++++++++++++++
> src/qemu/qemu_capabilities.h | 1 +
> src/qemu/qemu_capspriv.h | 4 +++
> src/qemu/qemu_monitor.c | 9 ++++++
> src/qemu/qemu_monitor.h | 3 ++
> src/qemu/qemu_monitor_json.c | 73 ++++++++++++++++++++++++++++++++++++++++++
> src/qemu/qemu_monitor_json.h | 3 ++
> 8 files changed, 149 insertions(+)
>
> diff --git a/src/conf/domain_capabilities.h b/src/conf/domain_capabilities.h
> index fa4c1e442f57..83d04d4c8506 100644
> --- a/src/conf/domain_capabilities.h
> +++ b/src/conf/domain_capabilities.h
> @@ -137,6 +137,19 @@ struct _virDomainCapsCPU {
> virDomainCapsCPUModelsPtr custom;
> };
>
> +/*
> + * SEV capabilities
> + */
> +typedef struct _virSEVCapability virSEVCapability;
> +typedef virSEVCapability *virSEVCapabilityPtr;
> +struct _virSEVCapability {
> + char *pdh;
> + char *cert_chain;
> + int cbitpos;
> + int reduced_phys_bits;
If you have any reason to re-spin this patch series, lets make these
two be unsigned int, since IIUC -ve values are not possible.
> +};
> +
> +
> struct _virDomainCaps {
> virObjectLockable parent;
>
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index b5eb8cf46a52..68e3622a3963 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -459,6 +459,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
> "pl011",
> "machine.pseries.max-cpu-compat",
> "dump-completed",
> + "sev",
> );
>
>
> @@ -525,6 +526,8 @@ struct _virQEMUCaps {
> size_t ngicCapabilities;
> virGICCapability *gicCapabilities;
>
> + virSEVCapability *sevCapabilities;
> +
> virQEMUCapsHostCPUData kvmCPU;
> virQEMUCapsHostCPUData tcgCPU;
> };
> @@ -2811,6 +2814,21 @@ virQEMUCapsSetGICCapabilities(virQEMUCapsPtr qemuCaps,
> qemuCaps->ngicCapabilities = ncapabilities;
> }
>
> +void
> +virQEMUCapsSetSEVCapabilities(virQEMUCapsPtr qemuCaps,
> + virSEVCapability *capabilities)
> +{
> + virSEVCapability *cap = qemuCaps->sevCapabilities;
> +
> + if (cap) {
> + VIR_FREE(cap->pdh);
> + VIR_FREE(cap->cert_chain);
> + }
> +
> + VIR_FREE(qemuCaps->sevCapabilities);
> +
> + qemuCaps->sevCapabilities = capabilities;
> +}
>
> static int
> virQEMUCapsProbeQMPCommands(virQEMUCapsPtr qemuCaps,
> @@ -3318,6 +3336,19 @@ virQEMUCapsProbeQMPGICCapabilities(virQEMUCapsPtr qemuCaps,
> return 0;
> }
>
> +static int
> +virQEMUCapsProbeQMPSEVCapabilities(virQEMUCapsPtr qemuCaps,
> + qemuMonitorPtr mon)
> +{
> + virSEVCapability *caps = NULL;
> +
> + if (qemuMonitorGetSEVCapabilities(mon, &caps) < 0)
> + return -1;
> +
> + virQEMUCapsSetSEVCapabilities(qemuCaps, caps);
> +
> + return 0;
> +}
>
> bool
> virQEMUCapsCPUFilterFeatures(const char *name,
> @@ -4896,6 +4927,12 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
> virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_MAX_CPU_COMPAT);
> }
>
> + /* no way to query -object sev-guest */
> + if (ARCH_IS_X86(qemuCaps->arch) &&
> + qemuCaps->version >= 2012000) {
> + virQEMUCapsSet(qemuCaps, QEMU_CAPS_SEV);
> + }
Sigh, we really need to fix introspection of -object types one day...
> +
> if (virQEMUCapsProbeQMPCommands(qemuCaps, mon) < 0)
> goto cleanup;
>
> @@ -4951,6 +4988,12 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
> virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION))
> virQEMUCapsSet(qemuCaps, QEMU_CAPS_CPU_CACHE);
>
> + /* Probe for SEV capabilities */
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SEV)) {
> + if (virQEMUCapsProbeQMPSEVCapabilities(qemuCaps, mon) < 0)
> + virQEMUCapsClear(qemuCaps, QEMU_CAPS_SEV);
> + }
> +
> ret = 0;
> cleanup:
> return ret;
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index c2ec2be19311..02acae491ab5 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -444,6 +444,7 @@ typedef enum {
> QEMU_CAPS_DEVICE_PL011, /* -device pl011 (not user-instantiable) */
> QEMU_CAPS_MACHINE_PSERIES_MAX_CPU_COMPAT, /* -machine pseries,max-cpu-compat= */
> QEMU_CAPS_DUMP_COMPLETED, /* DUMP_COMPLETED event */
> + QEMU_CAPS_SEV, /* -object sev-guest,... */
>
> QEMU_CAPS_LAST /* this must always be the last item */
> } virQEMUCapsFlags;
> diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h
> index 222f3368e3b6..1fa85cc14f07 100644
> --- a/src/qemu/qemu_capspriv.h
> +++ b/src/qemu/qemu_capspriv.h
> @@ -86,6 +86,10 @@ virQEMUCapsSetGICCapabilities(virQEMUCapsPtr qemuCaps,
> virGICCapability *capabilities,
> size_t ncapabilities);
>
> +void
> +virQEMUCapsSetSEVCapabilities(virQEMUCapsPtr qemuCaps,
> + virSEVCapability *capabilities);
> +
> int
> virQEMUCapsParseHelpStr(const char *qemu,
> const char *str,
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index ad5c572aeefb..195248c88ae1 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -4007,6 +4007,15 @@ qemuMonitorGetGICCapabilities(qemuMonitorPtr mon,
> return qemuMonitorJSONGetGICCapabilities(mon, capabilities);
> }
>
> +int
> +qemuMonitorGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **capabilities)
> +{
> + QEMU_CHECK_MONITOR_JSON(mon);
> +
> + return qemuMonitorJSONGetSEVCapabilities(mon, capabilities);
> +}
> +
>
> int
> qemuMonitorNBDServerStart(qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
> index 954ae88e4f64..1b2513650c58 100644
> --- a/src/qemu/qemu_monitor.h
> +++ b/src/qemu/qemu_monitor.h
> @@ -755,6 +755,9 @@ int qemuMonitorSetMigrationCapability(qemuMonitorPtr mon,
> int qemuMonitorGetGICCapabilities(qemuMonitorPtr mon,
> virGICCapability **capabilities);
>
> +int qemuMonitorGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **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 a09e93e464b3..94a1af1d3f75 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -6362,6 +6362,79 @@ qemuMonitorJSONGetGICCapabilities(qemuMonitorPtr mon,
> return ret;
> }
>
> +int
> +qemuMonitorJSONGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **capabilities)
> +{
> + int ret = -1;
> + virJSONValuePtr cmd;
> + virJSONValuePtr reply = NULL;
> + virJSONValuePtr caps;
> + virSEVCapability *capability = NULL;
> + const char *pdh = NULL, *cert_chain = NULL;
> + int cbitpos, reduced_phys_bits;
> +
> + *capabilities = NULL;
> +
> + if (!(cmd = qemuMonitorJSONMakeCommand("query-sev-capabilities",
> + NULL)))
> + return -1;
> +
> + if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
> + goto cleanup;
> +
> +
> + if (qemuMonitorJSONCheckError(cmd, reply) < 0)
> + goto cleanup;
> +
> + caps = virJSONValueObjectGetObject(reply, "return");
> +
> + if (virJSONValueObjectGetNumberInt(caps, "cbitpos", &cbitpos) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'cbitpos' field is missing"));
> + goto cleanup;
> + }
> +
> + if (virJSONValueObjectGetNumberInt(caps, "reduced-phys-bits",
> + &reduced_phys_bits) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'reduced-phys-bits' field is missing"));
> + goto cleanup;
> + }
> +
> + if (!(pdh = virJSONValueObjectGetString(caps, "pdh"))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'pdh' field is missing"));
> + goto cleanup;
> + }
> +
> + if (!(cert_chain = virJSONValueObjectGetString(caps, "cert-chain"))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'cert-chain' field is missing"));
> + goto cleanup;
> + }
> +
> + if (VIR_ALLOC(capability) < 0)
> + goto cleanup;
> +
> + if (VIR_STRDUP(capability->pdh, pdh) < 0)
> + goto cleanup;
> +
> + if (VIR_STRDUP(capability->cert_chain, cert_chain) < 0)
> + goto cleanup;
> +
> + capability->cbitpos = cbitpos;
> + capability->reduced_phys_bits = reduced_phys_bits;
> + *capabilities = capability;
> + ret = 0;
> +
> + cleanup:
> + virJSONValueFree(cmd);
> + virJSONValueFree(reply);
> +
> + return ret;
> +}
> +
> static virJSONValuePtr
> qemuMonitorJSONBuildInetSocketAddress(const char *host,
> const char *port)
> diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
> index ec243becc4ae..305f789902e9 100644
> --- a/src/qemu/qemu_monitor_json.h
> +++ b/src/qemu/qemu_monitor_json.h
> @@ -152,6 +152,9 @@ int qemuMonitorJSONSetMigrationCapability(qemuMonitorPtr mon,
> int qemuMonitorJSONGetGICCapabilities(qemuMonitorPtr mon,
> virGICCapability **capabilities);
>
> +int qemuMonitorJSONGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **capabilities);
> +
> int qemuMonitorJSONMigrate(qemuMonitorPtr mon,
> unsigned int flags,
> const char *uri);
Reviewed-by: Daniel P. Berrangé <berrange at redhat.com>
Regards,
Daniel
--
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