mirror of
https://gitlab.com/libvirt/libvirt.git
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0cc6f8931f
Links between NUMA nodes can have different latencies and
bandwidths. This info is newly defined in ACPI 6.2 under
Heterogeneous Memory Attribute Table (HMAT) table. Linux kernel
learned how to report these values under sysfs and thus we can
expose them in our capabilities XML. The sysfs interface is
documented in kernel's Documentation/admin-guide/mm/numaperf.rst.
Long story short, two nodes can be in initiator-target
relationship. A node can be initiator if it has a CPU or a device
that's capable of initiating memory transfer. Therefore a node
that has just memory can only be target. An initiator-target link
can then have any combination of {bandwidth, latency} - {access,
read, write} attribute (6 in total). However, the standard says
access is applicable iff read and write values are the same.
Therefore, we really have just four combinations of attributes:
bandwidth-read, bandwidth-write, latency-read, latency-write.
This is the combination that kernel reports anyway.
Then, under /sys/system/devices/node/nodeX/acccessN/initiators we
find values for those 4 attributes and also symlinks named
"nodeN" which then represent initiators to nodeX. For instance:
/sys/system/node/node1/access1/initiators/node0 -> ../../node0
/sys/system/node/node1/access1/initiators/read_bandwidth
/sys/system/node/node1/access1/initiators/read_latency
/sys/system/node/node1/access1/initiators/write_bandwidth
/sys/system/node/node1/access1/initiators/write_latency
This means that node0 is initiator and node1 is target and values
of the interconnect can be read.
In theory, there can be separate links to memory side caches too
(e.g. one link from node X to node Y's main memory, another from
node X to node Y's L1 cache, another one to L2 cache and so on).
But sysfs does not express this relationship just yet.
The "accessN" means either "access0" or "access1". The difference
is that while the former expresses the best interconnect between
two nodes including CPUS and I/O devices (such as GPUs and NICs),
the latter includes only CPUs and thus is what we need.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1786309
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
528 lines
12 KiB
XML
528 lines
12 KiB
XML
<?xml version="1.0"?>
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<!-- A Relax NG schema for the libvirt capabilities XML format -->
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<grammar xmlns="http://relaxng.org/ns/structure/1.0"
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datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
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<include href="basictypes.rng"/>
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<include href="cputypes.rng"/>
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<start>
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<ref name="capabilities"/>
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</start>
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<define name="capabilities">
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<element name="capabilities">
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<ref name="hostcaps"/>
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<zeroOrMore>
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<ref name="guestcaps"/>
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</zeroOrMore>
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</element>
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</define>
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<define name="hostcaps">
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<element name="host">
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<optional>
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<element name="uuid">
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<ref name="UUID"/>
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</element>
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</optional>
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<ref name="hostcpu"/>
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<optional>
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<ref name="power_management"/>
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</optional>
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<optional>
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<ref name="iommu_support"/>
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</optional>
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<optional>
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<ref name="migration"/>
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</optional>
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<optional>
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<ref name="topology"/>
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</optional>
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<optional>
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<ref name="cache"/>
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</optional>
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<optional>
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<ref name="memory_bandwidth"/>
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</optional>
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<zeroOrMore>
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<ref name="secmodel"/>
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</zeroOrMore>
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</element>
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</define>
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<define name="secmodel">
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<element name="secmodel">
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<interleave>
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<element name="model">
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<text/>
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</element>
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<element name="doi">
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<text/>
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</element>
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<zeroOrMore>
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<element name="baselabel">
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<attribute name="type">
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<text/>
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</attribute>
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<text/>
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</element>
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</zeroOrMore>
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</interleave>
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</element>
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</define>
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<define name="power_management">
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<element name="power_management">
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<interleave>
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<optional>
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<element name="suspend_mem">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="suspend_disk">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="suspend_hybrid">
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<empty/>
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</element>
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</optional>
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</interleave>
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</element>
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</define>
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<define name="iommu_support">
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<element name="iommu">
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<optional>
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<attribute name="support">
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<ref name="virYesNo"/>
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</attribute>
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</optional>
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</element>
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</define>
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<define name="migration">
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<element name="migration_features">
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<optional>
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<element name="live">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="uri_transports">
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<oneOrMore>
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<element name="uri_transport">
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<choice>
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<value>vpxmigr</value>
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<value>tcp</value>
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<value>rdma</value>
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<value>vzmigr</value>
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</choice>
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</element>
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</oneOrMore>
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</element>
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</optional>
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</element>
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</define>
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<define name="topology">
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<element name="topology">
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<element name="cells">
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<attribute name="num">
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<ref name="unsignedInt"/>
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</attribute>
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<oneOrMore>
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<ref name="cell"/>
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</oneOrMore>
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</element>
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<optional>
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<ref name="numaInterconnects"/>
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</optional>
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</element>
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</define>
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<define name="cell">
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<element name="cell">
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<attribute name="id">
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<ref name="unsignedInt"/>
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</attribute>
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<optional>
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<ref name="memory"/>
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</optional>
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<zeroOrMore>
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<ref name="pagesNuma"/>
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</zeroOrMore>
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<optional>
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<element name="distances">
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<oneOrMore>
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<ref name="numaDistance"/>
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</oneOrMore>
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</element>
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</optional>
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<zeroOrMore>
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<ref name="numaCache"/>
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</zeroOrMore>
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<optional>
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<element name="cpus">
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<attribute name="num">
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<ref name="unsignedInt"/>
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</attribute>
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<zeroOrMore>
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<ref name="cpu"/>
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</zeroOrMore>
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</element>
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</optional>
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</element>
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</define>
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<define name="memory">
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<element name="memory">
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<ref name="scaledInteger"/>
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</element>
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</define>
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<define name="cpu">
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<element name="cpu">
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<attribute name="id">
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<ref name="unsignedInt"/>
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</attribute>
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<optional>
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<attribute name="socket_id">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="die_id">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="core_id">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="siblings">
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<ref name="cpuset"/>
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</attribute>
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</optional>
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</element>
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</define>
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<define name="cache">
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<element name="cache">
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<oneOrMore>
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<element name="bank">
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<attribute name="id">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="level">
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<ref name="unsignedInt"/>
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</attribute>
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<ref name="cacheType"/>
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<attribute name="size">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="unit">
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<ref name="unit"/>
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</attribute>
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<attribute name="cpus">
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<ref name="cpuset"/>
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</attribute>
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<zeroOrMore>
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<element name="control">
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<attribute name="granularity">
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<ref name="unsignedInt"/>
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</attribute>
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<optional>
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<attribute name="min">
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<ref name="unsignedInt"/>
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</attribute>
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</optional>
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<attribute name="unit">
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<ref name="unit"/>
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</attribute>
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<ref name="cacheType"/>
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<attribute name="maxAllocs">
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<ref name="unsignedInt"/>
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</attribute>
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</element>
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</zeroOrMore>
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</element>
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</oneOrMore>
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<optional>
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<ref name="cpuMonitor"/>
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</optional>
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</element>
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</define>
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<define name="cacheType">
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<attribute name="type">
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<choice>
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<value>both</value>
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<value>code</value>
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<value>data</value>
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</choice>
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</attribute>
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</define>
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<define name="memory_bandwidth">
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<element name="memory_bandwidth">
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<oneOrMore>
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<element name="node">
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<attribute name="id">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="cpus">
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<ref name="cpuset"/>
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</attribute>
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<zeroOrMore>
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<element name="control">
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<attribute name="granularity">
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<ref name="unsignedInt"/>
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</attribute>
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<optional>
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<attribute name="min">
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<ref name="unsignedInt"/>
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</attribute>
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</optional>
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<attribute name="maxAllocs">
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<ref name="unsignedInt"/>
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</attribute>
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</element>
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</zeroOrMore>
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</element>
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</oneOrMore>
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<optional>
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<ref name="cpuMonitor"/>
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</optional>
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</element>
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</define>
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<define name="cpuMonitor">
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<element name="monitor">
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<optional>
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<attribute name="level">
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<ref name="unsignedInt"/>
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</attribute>
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<attribute name="reuseThreshold">
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<ref name="unsignedInt"/>
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</attribute>
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</optional>
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<attribute name="maxMonitors">
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<ref name="unsignedInt"/>
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</attribute>
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<oneOrMore>
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<element name="feature">
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<attribute name="name">
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<ref name="monitorFeature"/>
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</attribute>
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</element>
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</oneOrMore>
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</element>
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</define>
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<define name="monitorFeature">
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<data type="string">
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<param name="pattern">(llc_|mbm_)[a-zA-Z0-9\-_]+</param>
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</data>
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</define>
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<define name="guestcaps">
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<element name="guest">
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<ref name="ostype"/>
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<ref name="arch"/>
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<optional>
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<ref name="features"/>
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</optional>
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</element>
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</define>
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<define name="ostype">
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<element name="os_type">
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<choice>
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<value>xen</value> <!-- Xen 3.0 pv -->
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<value>linux</value> <!-- same as "xen" - meant to be legacy -->
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<value>hvm</value> <!-- unmodified OS -->
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<value>exe</value> <!-- For container based virt -->
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<value>uml</value> <!-- user mode linux; NOT USED ANYMORE -->
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</choice>
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</element>
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</define>
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<define name="arch">
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<element name="arch">
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<attribute name="name">
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<ref name="archnames"/>
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</attribute>
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<ref name="wordsize"/>
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<optional>
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<ref name="emulator"/>
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</optional>
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<optional>
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<ref name="loader"/>
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</optional>
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<zeroOrMore>
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<ref name="machine"/>
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</zeroOrMore>
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<oneOrMore>
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<ref name="domain"/>
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</oneOrMore>
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</element>
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</define>
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<define name="emulator">
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<element name="emulator">
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<ref name="absFilePath"/>
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</element>
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</define>
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<define name="loader">
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<element name="loader">
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<ref name="absFilePath"/>
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</element>
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</define>
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<define name="wordsize">
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<element name="wordsize">
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<choice>
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<value>31</value>
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<value>32</value>
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<value>64</value>
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</choice>
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</element>
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</define>
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<define name="machine">
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<element name="machine">
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<optional>
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<attribute name="canonical">
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<text/>
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</attribute>
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</optional>
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<optional>
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<attribute name="maxCpus">
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<ref name="unsignedInt"/>
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</attribute>
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</optional>
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<optional>
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<attribute name="deprecated">
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<choice>
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<value>yes</value>
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<value>no</value>
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</choice>
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</attribute>
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</optional>
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<text/>
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</element>
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</define>
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<define name="domain">
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<element name="domain">
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<attribute name="type">
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<choice>
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<value>qemu</value>
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<value>kqemu</value>
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<value>kvm</value>
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<value>xen</value>
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<value>uml</value> <!-- NOT USED ANYMORE -->
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<value>lxc</value>
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<value>openvz</value>
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<value>test</value>
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</choice>
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</attribute>
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<optional>
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<ref name="emulator"/>
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</optional>
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<zeroOrMore>
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<ref name="machine"/>
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</zeroOrMore>
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</element>
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</define>
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<define name="features">
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<element name="features">
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<interleave>
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<optional>
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<element name="pae">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="nonpae">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="ia64_be">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="acpi">
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<ref name="featuretoggle"/>
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="apic">
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<ref name="featuretoggle"/>
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="cpuselection">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="deviceboot">
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="disksnapshot">
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<ref name="featuretoggle"/>
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<empty/>
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</element>
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</optional>
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<optional>
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<element name="hap">
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<ref name="featuretoggle"/>
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<empty/>
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</element>
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</optional>
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</interleave>
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</element>
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</define>
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<define name="featuretoggle">
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<attribute name="toggle">
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<ref name="virYesNo"/>
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</attribute>
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<attribute name="default">
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<ref name="virOnOff"/>
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</attribute>
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</define>
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<define name="pagesNuma">
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<element name="pages">
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<ref name="pagesElem"/>
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<ref name="unsignedInt"/>
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</element>
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</define>
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<define name="pagesElem">
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<optional>
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<attribute name="unit">
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<ref name="unit"/>
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</attribute>
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</optional>
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<attribute name="size">
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<ref name="unsignedInt"/>
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</attribute>
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</define>
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</grammar>
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