[libvirt] [PATCH v6 1/9] qemu: provide support to query the SEV capability
Erik Skultety
eskultet at redhat.com
Mon May 28 07:25:36 UTC 2018
On Wed, May 23, 2018 at 04:18:26PM -0500, 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 | 47 ++++++++++++++
> src/qemu/qemu_capabilities.h | 4 ++
> src/qemu/qemu_capspriv.h | 4 ++
> src/qemu/qemu_monitor.c | 9 +++
> src/qemu/qemu_monitor.h | 3 +
> src/qemu/qemu_monitor_json.c | 74 ++++++++++++++++++++++
> src/qemu/qemu_monitor_json.h | 3 +
> .../caps_2.12.0.x86_64.replies | 10 +++
> tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml | 3 +-
> 10 files changed, 169 insertions(+), 1 deletion(-)
>
> diff --git a/src/conf/domain_capabilities.h b/src/conf/domain_capabilities.h
> index 9b852e8649bf..c1093234ceb8 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;
> + unsigned int cbitpos;
> + unsigned int reduced_phys_bits;
> +};
> +
> +
> struct _virDomainCaps {
> virObjectLockable parent;
>
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index 8a63db5f4f33..49b74f7e12c1 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -489,6 +489,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
> "screendump_device",
> "hda-output",
> "blockdev-del",
> + "sev-guest",
> );
>
>
> @@ -555,6 +556,8 @@ struct _virQEMUCaps {
> size_t ngicCapabilities;
> virGICCapability *gicCapabilities;
>
> + virSEVCapability *sevCapabilities;
> +
> virQEMUCapsHostCPUData kvmCPU;
> virQEMUCapsHostCPUData tcgCPU;
> };
> @@ -1121,6 +1124,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
> { "virtual-css-bridge", QEMU_CAPS_CCW },
> { "vfio-ccw", QEMU_CAPS_DEVICE_VFIO_CCW },
> { "hda-output", QEMU_CAPS_HDA_OUTPUT },
> + { "sev-guest", QEMU_CAPS_SEV_GUEST },
> };
>
> static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBalloon[] = {
> @@ -2050,6 +2054,28 @@ virQEMUCapsSetGICCapabilities(virQEMUCapsPtr qemuCaps,
> }
>
>
> +void
> +virQEMUSevCapabilitiesFree(virSEVCapability *cap)
Since virSEVCapability will be added to virDomainCaps too, you need to move
^this into domain_capabilities.c so it will become virSEVCapabilityFree, I've
got a further comment regarding this in patch 2 as well.
NOTE: notice the SEV in the function name, we should stay consistent in naming
and since SEV is the name of the feature...
> +{
> + if (!cap)
> + return;
> +
> + VIR_FREE(cap->pdh);
> + VIR_FREE(cap->cert_chain);
> + VIR_FREE(cap);
> +}
> +
> +
> +void
> +virQEMUCapsSetSEVCapabilities(virQEMUCapsPtr qemuCaps,
> + virSEVCapability *capabilities)
> +{
> + virQEMUSevCapabilitiesFree(qemuCaps->sevCapabilities);
virSEVCapabilityFree(qemuCaps->sevCapabilities)
> +
> + qemuCaps->sevCapabilities = capabilities;
> +}
> +
> +
> static int
> virQEMUCapsProbeQMPCommands(virQEMUCapsPtr qemuCaps,
> qemuMonitorPtr mon)
> @@ -2580,6 +2606,21 @@ virQEMUCapsProbeQMPGICCapabilities(virQEMUCapsPtr qemuCaps,
> }
>
>
> +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,
> void *opaque)
> @@ -3965,6 +4006,12 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
> virQEMUCapsClear(qemuCaps, QEMU_CAPS_DEVICE_VFIO_CCW);
> }
>
> + /* Probe for SEV capabilities */
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SEV_GUEST)) {
> + if (virQEMUCapsProbeQMPSEVCapabilities(qemuCaps, mon) < 0)
> + virQEMUCapsClear(qemuCaps, QEMU_CAPS_SEV_GUEST);
> + }
> +
> ret = 0;
> cleanup:
> return ret;
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index 3e120e64c0b4..8b7eef4359b7 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -473,6 +473,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
> QEMU_CAPS_SCREENDUMP_DEVICE, /* screendump command accepts device & head */
> QEMU_CAPS_HDA_OUTPUT, /* -device hda-output */
> QEMU_CAPS_BLOCKDEV_DEL, /* blockdev-del is supported */
> + QEMU_CAPS_SEV_GUEST, /* -object sev-guest,... */
>
> QEMU_CAPS_LAST /* this must always be the last item */
> } virQEMUCapsFlags;
> @@ -599,4 +600,7 @@ bool virQEMUCapsGuestIsNative(virArch host,
> bool virQEMUCapsCPUFilterFeatures(const char *name,
> void *opaque);
>
> +void
> +virQEMUSevCapabilitiesFree(virSEVCapability *capabilities);
> +
> #endif /* __QEMU_CAPABILITIES_H__*/
> diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h
> index 0199501c931b..20b03876d470 100644
> --- a/src/qemu/qemu_capspriv.h
> +++ b/src/qemu/qemu_capspriv.h
> @@ -85,6 +85,10 @@ virQEMUCapsSetGICCapabilities(virQEMUCapsPtr qemuCaps,
> virGICCapability *capabilities,
> size_t ncapabilities);
>
> +void
> +virQEMUCapsSetSEVCapabilities(virQEMUCapsPtr qemuCaps,
> + virSEVCapability *capabilities);
> +
> int
> virQEMUCapsProbeQMPCPUDefinitions(virQEMUCapsPtr qemuCaps,
> qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index 43f1d2f81671..3b034930408c 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -3778,6 +3778,15 @@ qemuMonitorGetGICCapabilities(qemuMonitorPtr mon,
> return qemuMonitorJSONGetGICCapabilities(mon, capabilities);
> }
1 more blank line here...
>
> +int
> +qemuMonitorGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **capabilities)
> +{
> + QEMU_CHECK_MONITOR(mon);
> +
> + return qemuMonitorJSONGetSEVCapabilities(mon, capabilities);
> +}
> +
>
> int
> qemuMonitorNBDServerStart(qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
> index c28db1a52b8b..b1b7ef09c929 100644
> --- a/src/qemu/qemu_monitor.h
> +++ b/src/qemu/qemu_monitor.h
> @@ -710,6 +710,9 @@ int qemuMonitorSetMigrationCapabilities(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 9f5c35879587..24d3a2ff412f 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -6436,6 +6436,80 @@ qemuMonitorJSONGetGICCapabilities(qemuMonitorPtr mon,
> return ret;
> }
>
Need 1 more blank line here...
> +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;
We declared ^these as uint in virSEVCapability, so that fact should be
reflected here too...
> +
> + *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) {
GetNumberUInt()...
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'cbitpos' field is missing"));
> + goto cleanup;
> + }
> +
> + if (virJSONValueObjectGetNumberInt(caps, "reduced-phys-bits",
> + &reduced_phys_bits) < 0) {
GetNumberUInt()...
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'reduced-phys-bits' field is missing"));
we should mention the query command that failed, i.e.
"query-sev-capabilities reply was missing 'xyz' field"
> + goto cleanup;
> + }
> +
> + if (!(pdh = virJSONValueObjectGetString(caps, "pdh"))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("'pdh' field is missing"));
same here
> + goto cleanup;
> + }
> +
> + if (!(cert_chain = virJSONValueObjectGetString(caps, "cert-chain"))) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
same here...
> + _("'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;
> + VIR_STEAL_PTR(*capabilities, capability);
> + ret = 0;
> +
> + cleanup:
> + virQEMUSevCapabilitiesFree(capability);
> + 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 f4ac8319ac8a..129aab22bf98 100644
> --- a/src/qemu/qemu_monitor_json.h
> +++ b/src/qemu/qemu_monitor_json.h
> @@ -152,6 +152,9 @@ int qemuMonitorJSONSetMigrationCapabilities(qemuMonitorPtr mon,
> int qemuMonitorJSONGetGICCapabilities(qemuMonitorPtr mon,
> virGICCapability **capabilities);
>
> +int qemuMonitorJSONGetSEVCapabilities(qemuMonitorPtr mon,
> + virSEVCapability **capabilities);
> +
> int qemuMonitorJSONMigrate(qemuMonitorPtr mon,
> unsigned int flags,
> const char *uri);
> diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.replies b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.replies
> index c40046beef6b..ace35374ef96 100644
> --- a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.replies
> +++ b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.replies
> @@ -18995,6 +18995,16 @@
> "id": "libvirt-51"
> }
>
> +{
> + "return" : {
> + "reduced-phys-bits": 1,
> + "cbitpos": 47,
> + "cert-chain": "AQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAA",
> + "pdh": "AQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAAAQAAAAAOAAA"
> + },
> + "id": "libvirt-52"
> +}
> +
> {
> "return": {
> },
> diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
> index 3c7dadffcd8a..58a1bf835a73 100644
> --- a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
> +++ b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
> @@ -204,9 +204,10 @@
> <flag name='screendump_device'/>
> <flag name='hda-output'/>
> <flag name='blockdev-del'/>
> + <flag name='sev-guest'/>
> <version>2011090</version>
> <kvmVersion>0</kvmVersion>
> - <microcodeVersion>390813</microcodeVersion>
> + <microcodeVersion>391059</microcodeVersion>
> <package>v2.12.0-rc0</package>
> <arch>x86_64</arch>
> <hostCPU type='kvm' model='base' migratability='yes'>
Erik
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