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5c0b66529a
This PR addresses a bug in which the cpu topology of a guest
with non power-of-two number of cores is incorrect. For example,
in some contexts, a virtual machine with 2-sockets and 12-cores
will incorrectly believe that 16 cores are on socket 1 and 8
cores are on socket 2. In other cases, common topology enumeration
software such as hwloc will crash.
The root of the problem was the way that cloud-hypervisor generates
apic_id. On x86_64, the (x2) apic_id embeds information about cpu
topology. The cpuid instruction is primarily used to discover the
number of sockets, dies, cores, threads, etc. Using this information,
the (x2) apic_id is masked to determine which {core, die, socket} the
cpu is on. When the cpu topology is not a power of two
(e.g. a 12-core machine), this requires non-contiguous (x2) apic_id.
Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
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|---|---|---|
| .. | ||
| api | ||
| igvm | ||
| acpi.rs | ||
| clone3.rs | ||
| config.rs | ||
| coredump.rs | ||
| cpu.rs | ||
| device_manager.rs | ||
| device_tree.rs | ||
| gdb.rs | ||
| interrupt.rs | ||
| lib.rs | ||
| memory_manager.rs | ||
| migration.rs | ||
| pci_segment.rs | ||
| seccomp_filters.rs | ||
| serial_manager.rs | ||
| sigwinch_listener.rs | ||
| vm_config.rs | ||
| vm.rs | ||