[PATCH 1/2] virhostcpu: Introduce virHostCPUGetIsolated()

This is a helper that parses /sys/devices/system/cpu/isolated into a virBitmap. It's going to be needed soon. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/libvirt_private.syms | 1 + src/util/virhostcpu.c | 21 +++++++++++++++++++++ src/util/virhostcpu.h | 1 + 3 files changed, 23 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 839fe4f545..ed85f022e4 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2502,6 +2502,7 @@ virHostCPUGetCount; virHostCPUGetCPUID; virHostCPUGetHaltPollTime; virHostCPUGetInfo; +virHostCPUGetIsolated; virHostCPUGetKVMMaxVCPUs; virHostCPUGetMap; virHostCPUGetMicrocodeVersion; diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c index 01de69c0d1..e61eb12414 100644 --- a/src/util/virhostcpu.c +++ b/src/util/virhostcpu.c @@ -1151,6 +1151,27 @@ virHostCPUGetAvailableCPUsBitmap(void) return g_steal_pointer(&bitmap); } +/** + * virHostCPUGetIsolated: + * + * Returns a bitmap of isolated CPUs (e.g. those passed to isolcpus= kernel + * cmdline). + */ +virBitmap * +virHostCPUGetIsolated(void) +{ +#ifdef __linux__ + virBitmap *ret = NULL; + + virFileReadValueBitmap(&ret, "%s/cpu/isolated", SYSFS_SYSTEM_PATH); + + return ret; +#else + virReportError(VIR_ERR_NO_SUPPORT, "%s", + _("map of isolated CPUs not implemented on this platform")); + return NULL; +#endif +} #if WITH_LINUX_KVM_H && defined(KVM_CAP_PPC_SMT) diff --git a/src/util/virhostcpu.h b/src/util/virhostcpu.h index d7e09bff22..e7b15a2649 100644 --- a/src/util/virhostcpu.h +++ b/src/util/virhostcpu.h @@ -43,6 +43,7 @@ bool virHostCPUHasBitmap(void); virBitmap *virHostCPUGetPresentBitmap(void); virBitmap *virHostCPUGetOnlineBitmap(void); virBitmap *virHostCPUGetAvailableCPUsBitmap(void); +virBitmap *virHostCPUGetIsolated(void); int virHostCPUGetCount(void); int virHostCPUGetThreadsPerSubcore(virArch arch) G_NO_INLINE; -- 2.43.2