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| author | Saurabh Sengar <[email protected]> | 2024-01-15 09:57:40 -0800 |
|---|---|---|
| committer | Wei Liu <[email protected]> | 2024-03-01 08:36:22 +0000 |
| commit | 0d63e4c0ebc2b5c329babde44fd61d3f08db814d (patch) | |
| tree | 813562678ea82cbe4b7037568837ada3a30653cb /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py | |
| parent | 0f34d11234868dc979730a905717c15067a7d205 (diff) | |
x86/hyperv: Allow 15-bit APIC IDs for VTL platforms
The current method for signaling the compatibility of a Hyper-V host
with MSIs featuring 15-bit APIC IDs relies on a synthetic cpuid leaf.
However, for higher VTLs, this leaf is not reported, due to the absence
of an IO-APIC.
As an alternative, assume that when running at a high VTL, the host
supports 15-bit APIC IDs. This assumption is safe, as Hyper-V does not
employ any architectural MSIs at higher VTLs
This unblocks startup of VTL2 environments with more than 256 CPUs.
Signed-off-by: Saurabh Sengar <[email protected]>
Reviewed-by: Michael Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Wei Liu <[email protected]>
Message-ID: <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py')
0 files changed, 0 insertions, 0 deletions