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virhostcpu: Add virHostCPUGetCPUID
Signed-off-by: Tim Wiederhake <twiederh@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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@ -2398,6 +2398,7 @@ virHookPresent;
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# util/virhostcpu.h
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virHostCPUGetAvailableCPUsBitmap;
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virHostCPUGetCount;
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virHostCPUGetCPUID;
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virHostCPUGetHaltPollTime;
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virHostCPUGetInfo;
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virHostCPUGetKVMMaxVCPUs;
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@ -1336,6 +1336,41 @@ virHostCPUGetMSR(unsigned long index,
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}
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struct kvm_cpuid2 *
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virHostCPUGetCPUID(void)
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{
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size_t i;
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VIR_AUTOCLOSE fd = open(KVM_DEVICE, O_RDONLY);
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if (fd < 0) {
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virReportSystemError(errno, _("Unable to open %s"), KVM_DEVICE);
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return NULL;
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}
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for (i = 1; i < INT32_MAX; i *= 2) {
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g_autofree struct kvm_cpuid2 *kvm_cpuid = NULL;
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kvm_cpuid = g_malloc0(sizeof(struct kvm_cpuid2) +
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sizeof(struct kvm_cpuid_entry2) * i);
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kvm_cpuid->nent = i;
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if (ioctl(fd, KVM_GET_SUPPORTED_CPUID, kvm_cpuid) == 0) {
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/* filter out local apic id */
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for (i = 0; i < kvm_cpuid->nent; ++i) {
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struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i];
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if (entry->function == 0x01 && entry->index == 0x00)
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entry->ebx &= 0x00ffffff;
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if (entry->function == 0x0b)
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entry->edx &= 0xffffff00;
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}
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return g_steal_pointer(&kvm_cpuid);
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}
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}
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virReportSystemError(errno, "%s", _("Cannot read host CPUID"));
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return NULL;
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}
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/*
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* This function should only be called when the host CPU supports invariant TSC
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* (invtsc CPUID feature).
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@ -1391,6 +1426,14 @@ virHostCPUGetTscInfo(void)
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#else
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struct kvm_cpuid2 *
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virHostCPUGetCPUID(void)
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{
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virReportSystemError(ENOSYS, "%s",
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_("Reading CPUID is not supported on this platform"));
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return NULL;
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}
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int
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virHostCPUGetMSR(unsigned long index G_GNUC_UNUSED,
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uint64_t *msr G_GNUC_UNUSED)
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@ -80,6 +80,8 @@ virHostCPUGetMicrocodeVersion(virArch hostArch) G_GNUC_NO_INLINE;
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int virHostCPUGetMSR(unsigned long index,
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uint64_t *msr);
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struct kvm_cpuid2 *virHostCPUGetCPUID(void);
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virHostCPUTscInfo *virHostCPUGetTscInfo(void);
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int virHostCPUGetSignature(char **signature);
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