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The new virHostCPUGetMSR internal API will try to read the MSR from /dev/cpu/0/msr and if it is not possible (the device does not exist or libvirt is running unprivileged), it will fallback to asking KVM for the MSR using KVM_GET_MSRS ioctl. Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* virhostcpu.h: helper APIs for host CPU info
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*
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* Copyright (C) 2006-2016 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBVIRT_VIRHOSTCPU_H
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# define LIBVIRT_VIRHOSTCPU_H
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# include "internal.h"
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# include "virarch.h"
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# include "virbitmap.h"
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int virHostCPUGetStats(int cpuNum,
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virNodeCPUStatsPtr params,
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int *nparams,
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unsigned int flags);
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bool virHostCPUHasBitmap(void);
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virBitmapPtr virHostCPUGetPresentBitmap(void);
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virBitmapPtr virHostCPUGetOnlineBitmap(void);
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int virHostCPUGetCount(void);
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int virHostCPUGetThreadsPerSubcore(virArch arch) ATTRIBUTE_NOINLINE;
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int virHostCPUGetMap(unsigned char **cpumap,
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unsigned int *online,
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unsigned int flags);
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int virHostCPUGetInfo(virArch hostarch,
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unsigned int *cpus,
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unsigned int *mhz,
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unsigned int *nodes,
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unsigned int *sockets,
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unsigned int *cores,
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unsigned int *threads);
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int virHostCPUGetKVMMaxVCPUs(void) ATTRIBUTE_NOINLINE;
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int virHostCPUStatsAssign(virNodeCPUStatsPtr param,
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const char *name,
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unsigned long long value);
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# ifdef __linux__
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int virHostCPUGetSocket(unsigned int cpu, unsigned int *socket);
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int virHostCPUGetCore(unsigned int cpu, unsigned int *core);
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virBitmapPtr virHostCPUGetSiblingsList(unsigned int cpu);
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# endif
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int virHostCPUGetOnline(unsigned int cpu, bool *online);
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unsigned int virHostCPUGetMicrocodeVersion(void);
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int virHostCPUGetMSR(unsigned long index,
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uint64_t *msr);
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#endif /* LIBVIRT_VIRHOSTCPU_H */
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