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https://gitlab.com/libvirt/libvirt.git
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cpu: Add documentation for CPU driver APIs
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Jiri Denemark
parent
844a5c1eed
commit
a1b1fcdcfe
202
src/cpu/cpu.c
202
src/cpu/cpu.c
@ -77,6 +77,19 @@ cpuGetSubDriver(virArch arch)
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}
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/**
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* cpuCompareXML:
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*
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* @host: host CPU definition
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* @xml: XML description of either guest or host CPU to be compared with @host
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*
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* Compares the CPU described by @xml with @host CPU.
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*
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* Returns VIR_CPU_COMPARE_ERROR on error, VIR_CPU_COMPARE_INCOMPATIBLE when
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* the two CPUs are incompatible, VIR_CPU_COMPARE_IDENTICAL when the two CPUs
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* are identical, VIR_CPU_COMPARE_SUPERSET when the @xml CPU is a superset of
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* the @host CPU.
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*/
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virCPUCompareResult
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cpuCompareXML(virCPUDefPtr host,
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const char *xml)
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@ -112,6 +125,19 @@ cpuCompareXML(virCPUDefPtr host,
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}
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/**
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* cpuCompare:
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*
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* @host: host CPU definition
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* @cpu: either guest or host CPU to be compared with @host
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*
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* Compares the CPU described by @cpu with @host CPU.
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*
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* Returns VIR_CPU_COMPARE_ERROR on error, VIR_CPU_COMPARE_INCOMPATIBLE when
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* the two CPUs are incompatible, VIR_CPU_COMPARE_IDENTICAL when the two CPUs
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* are identical, VIR_CPU_COMPARE_SUPERSET when the @cpu CPU is a superset of
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* the @host CPU.
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*/
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virCPUCompareResult
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cpuCompare(virCPUDefPtr host,
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virCPUDefPtr cpu)
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@ -134,6 +160,31 @@ cpuCompare(virCPUDefPtr host,
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}
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/**
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* cpuDecode:
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*
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* @cpu: CPU definition stub to be filled in
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* @data: internal CPU data to be decoded into @cpu definition
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* @models: list of CPU models that can be considered when decoding @data
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* @nmodels: number of CPU models in @models
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* @preferred: CPU models that should be used if possible
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*
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* Decodes internal CPU data into a CPU definition consisting of a CPU model
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* and a list of CPU features. The @cpu model stub is supposed to have arch,
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* type, match and fallback members set, this function will add the rest. If
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* @models list is NULL, all models supported by libvirt will be considered
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* when decoding the data. In general, this function will select the model
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* closest to the CPU specified by @data unless @preferred is non-NULL, in
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* which case the @preferred model will be used as long as it is compatible
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* with @data.
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*
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* For VIR_ARCH_I686 and VIR_ARCH_X86_64 architectures this means the computed
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* CPU definition will have the shortest possible list of additional features.
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* When @preferred is non-NULL, the @preferred model will be used even if
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* other models would result in a shorter list of additional features.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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cpuDecode(virCPUDefPtr cpu,
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const virCPUData *data,
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@ -177,6 +228,25 @@ cpuDecode(virCPUDefPtr cpu,
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}
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/**
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* cpuEncode:
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*
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* @arch: CPU architecture
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* @cpu: CPU definition to be encoded into internal CPU driver representation
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* @forced: where to store CPU data corresponding to forced features
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* @required: where to store CPU data corresponding to required features
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* @optional: where to store CPU data corresponding to optional features
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* @disabled: where to store CPU data corresponding to disabled features
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* @forbidden: where to store CPU data corresponding to forbidden features
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* @vendor: where to store CPU data corresponding to CPU vendor
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*
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* Encode CPU definition from @cpu into internal CPU driver representation.
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* Any of @forced, @required, @optional, @disabled, @forbidden and @vendor
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* arguments can be NULL in case the caller is not interested in the
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* corresponding data.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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cpuEncode(virArch arch,
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const virCPUDef *cpu,
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@ -209,6 +279,15 @@ cpuEncode(virArch arch,
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}
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/**
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* cpuDataFree:
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*
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* @data: CPU data structure to be freed
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*
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* Free internal CPU data.
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*
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* Returns nothing.
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*/
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void
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cpuDataFree(virCPUDataPtr data)
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{
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@ -233,6 +312,13 @@ cpuDataFree(virCPUDataPtr data)
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}
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/**
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* cpuNodeData:
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*
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* @arch: CPU architecture
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*
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* Returns CPU data for host CPU or NULL on error.
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*/
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virCPUDataPtr
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cpuNodeData(virArch arch)
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{
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@ -254,6 +340,23 @@ cpuNodeData(virArch arch)
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}
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/**
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* cpuGuestData:
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*
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* @host: host CPU definition
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* @guest: guest CPU definition
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* @data: computed guest CPU data
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* @msg: error message describing why the @guest and @host CPUs are considered
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* incompatible
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*
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* Computes guest CPU data for the @guest CPU definition when run on the @host
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* CPU.
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*
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* Returns VIR_CPU_COMPARE_ERROR on error, VIR_CPU_COMPARE_INCOMPATIBLE when
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* the two CPUs are incompatible (@msg will describe the incompatibility),
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* VIR_CPU_COMPARE_IDENTICAL when the two CPUs are identical,
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* VIR_CPU_COMPARE_SUPERSET when the @guest CPU is a superset of the @host CPU.
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*/
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virCPUCompareResult
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cpuGuestData(virCPUDefPtr host,
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virCPUDefPtr guest,
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@ -278,6 +381,27 @@ cpuGuestData(virCPUDefPtr host,
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}
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/**
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* cpuBaselineXML:
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*
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* @xmlCPUs: list of host CPU XML descriptions
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* @ncpus: number of CPUs in @xmlCPUs
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* @models: list of CPU models that can be considered for the baseline CPU
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* @nmodels: number of CPU models in @models
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* @flags: bitwise-OR of virConnectBaselineCPUFlags
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*
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* Computes the most feature-rich CPU which is compatible with all given
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* host CPUs. If @models array is NULL, all models supported by libvirt will
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* be considered when computing the baseline CPU model, otherwise the baseline
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* CPU model will be one of the provided CPU @models.
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*
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* If @flags includes VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES then libvirt
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* will explicitly list all CPU features that are part of the host CPU,
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* without this flag features that are part of the CPU model will not be
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* listed.
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*
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* Returns XML description of the baseline CPU or NULL on error.
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*/
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char *
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cpuBaselineXML(const char **xmlCPUs,
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unsigned int ncpus,
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@ -353,6 +477,27 @@ cpuBaselineXML(const char **xmlCPUs,
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}
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/**
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* cpuBaseline:
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*
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* @cpus: list of host CPU definitions
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* @ncpus: number of CPUs in @cpus
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* @models: list of CPU models that can be considered for the baseline CPU
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* @nmodels: number of CPU models in @models
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* @flags: bitwise-OR of virConnectBaselineCPUFlags
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*
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* Computes the most feature-rich CPU which is compatible with all given
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* host CPUs. If @models array is NULL, all models supported by libvirt will
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* be considered when computing the baseline CPU model, otherwise the baseline
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* CPU model will be one of the provided CPU @models.
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*
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* If @flags includes VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES then libvirt
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* will explicitly list all CPU features that are part of the host CPU,
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* without this flag features that are part of the CPU model will not be
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* listed.
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*
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* Returns baseline CPU definition or NULL on error.
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*/
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virCPUDefPtr
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cpuBaseline(virCPUDefPtr *cpus,
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unsigned int ncpus,
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@ -404,6 +549,20 @@ cpuBaseline(virCPUDefPtr *cpus,
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}
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/**
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* cpuUpdate:
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*
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* @guest: guest CPU definition
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* @host: host CPU definition
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*
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* Updates @guest CPU definition according to @host CPU. This is required to
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* support guest CPU definition which are relative to host CPU, such as CPUs
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* with VIR_CPU_MODE_CUSTOM and optional features or VIR_CPU_MATCH_MINIMUM, or
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* CPUs with non-custom mode (VIR_CPU_MODE_HOST_MODEL,
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* VIR_CPU_MODE_HOST_PASSTHROUGH).
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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cpuUpdate(virCPUDefPtr guest,
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const virCPUDef *host)
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@ -425,6 +584,18 @@ cpuUpdate(virCPUDefPtr guest,
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return driver->update(guest, host);
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}
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/**
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* cpuHasFeature:
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*
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* @data: internal CPU representation
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* @feature: feature to be checked for
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*
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* Checks whether @feature is supported by the CPU described by @data.
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*
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* Returns 1 if the feature is supported, 0 if it's not supported, or
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* -1 on error.
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*/
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int
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cpuHasFeature(const virCPUData *data,
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const char *feature)
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@ -446,6 +617,16 @@ cpuHasFeature(const virCPUData *data,
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return driver->hasFeature(data, feature);
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}
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/**
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* cpuDataFormat:
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*
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* @data: internal CPU representation
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*
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* Formats @data into XML for test purposes.
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*
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* Returns string representation of the XML describing @data or NULL on error.
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*/
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char *
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cpuDataFormat(const virCPUData *data)
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{
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@ -466,6 +647,17 @@ cpuDataFormat(const virCPUData *data)
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return driver->dataFormat(data);
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}
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/**
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* cpuDataParse:
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*
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* @arch: CPU architecture
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* @xmlStr: XML string produced by cpuDataFormat
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*
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* Parses XML representation of virCPUData structure for test purposes.
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*
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* Returns internal CPU data structure parsed from the XML or NULL on error.
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*/
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virCPUDataPtr
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cpuDataParse(virArch arch,
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const char *xmlStr)
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@ -541,6 +733,16 @@ cpuGetArchModels(const char *arch, struct cpuGetModelsData *data)
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}
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/**
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* cpuGetModels:
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*
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* @archName: CPU architecture string
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* @models: where to store the list of supported models
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*
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* Fetches all CPU models supported by libvirt on @archName.
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*
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* Returns number of supported CPU models or -1 on error.
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*/
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int
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cpuGetModels(const char *archName, char ***models)
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{
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