[libvirt PATCH v2 18/20] virQEMUCaps: Add host cpuid information

[Tim Wiederhake <twiederh@xxxxxxxxxx>]

Many things can affect the availability of cpu flags (e.g. software
upgrades, kernel versions, kernel command line, etc.) and invalidate the
cached capabilities without notice. Add CPUID information to the
capabilities cache.

Signed-off-by: Tim Wiederhake <twiederh@xxxxxxxxxx>
---
 src/qemu/qemu_capabilities.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index e4fdd9a1eb..b2d5242264 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -725,6 +725,7 @@ struct _virQEMUCaps {
     char *kernelVersion;
 
     virArch arch;
+    virCPUData *cpuData;
 
     size_t ngicCapabilities;
     virGICCapability *gicCapabilities;
@@ -1965,6 +1966,7 @@ virQEMUCaps *virQEMUCapsNewCopy(virQEMUCaps *qemuCaps)
     ret->kernelVersion = g_strdup(qemuCaps->kernelVersion);
 
     ret->arch = qemuCaps->arch;
+    ret->cpuData = virCPUDataNewCopy(qemuCaps->cpuData);
 
     if (virQEMUCapsAccelCopy(&ret->kvm, &qemuCaps->kvm) < 0 ||
         virQEMUCapsAccelCopy(&ret->tcg, &qemuCaps->tcg) < 0)
@@ -2015,6 +2017,8 @@ void virQEMUCapsDispose(void *obj)
 
     g_free(qemuCaps->gicCapabilities);
 
+    virCPUDataFree(qemuCaps->cpuData);
+
     virSEVCapabilitiesFree(qemuCaps->sevCapabilities);
 
     virQEMUCapsAccelClear(&qemuCaps->kvm);
@@ -4260,6 +4264,12 @@ virQEMUCapsLoadCache(virArch hostArch,
     }
     VIR_FREE(str);
 
+    if (virXPathBoolean("boolean(./cpudata)", ctxt) > 0) {
+        qemuCaps->cpuData = virCPUDataParseNode(virXPathNode("./cpudata", ctxt));
+        if (!qemuCaps->cpuData)
+            goto cleanup;
+    }
+
     if (virQEMUCapsLoadAccel(qemuCaps, ctxt, VIR_DOMAIN_VIRT_KVM) < 0 ||
         virQEMUCapsLoadAccel(qemuCaps, ctxt, VIR_DOMAIN_VIRT_QEMU) < 0)
         goto cleanup;
@@ -4561,6 +4571,11 @@ virQEMUCapsFormatCache(virQEMUCaps *qemuCaps)
         virBufferAsprintf(&buf, "<kernelVersion>%s</kernelVersion>\n",
                           qemuCaps->kernelVersion);
 
+    if (qemuCaps->cpuData) {
+        g_autofree char * cpudata = virCPUDataFormat(qemuCaps->cpuData);
+        virBufferAsprintf(&buf, "%s", cpudata);
+    }
+
     virBufferAsprintf(&buf, "<arch>%s</arch>\n",
                       virArchToString(qemuCaps->arch));
 
@@ -5418,6 +5433,7 @@ virQEMUCapsNewForBinaryInternal(virArch hostArch,
     if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM)) {
         qemuCaps->hostCPUSignature = g_strdup(hostCPUSignature);
         qemuCaps->microcodeVersion = microcodeVersion;
+        qemuCaps->cpuData = NULL;
 
         qemuCaps->kernelVersion = g_strdup(kernelVersion);
 
-- 
2.31.1