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| author | Yazen Ghannam <yazen.ghannam@amd.com> | 2020-11-10 00:06:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-30 13:54:29 +0300 |
| commit | 700d098acec5271161606f3c0086b71695ea2ef8 (patch) | |
| tree | 5cf5d3943afcbd421e357cc0d205750f0415682f /Documentation/x86/amd-memory-encryption.rst | |
| parent | bb25fd492693a3a8654318f79c4c9e22f2d02aa1 (diff) | |
| download | linux-700d098acec5271161606f3c0086b71695ea2ef8.tar.xz | |
x86/CPU/AMD: Save AMD NodeId as cpu_die_id
[ Upstream commit 028c221ed1904af9ac3c5162ee98f48966de6b3d ]
AMD systems provide a "NodeId" value that represents a global ID
indicating to which "Node" a logical CPU belongs. The "Node" is a
physical structure equivalent to a Die, and it should not be confused
with logical structures like NUMA nodes. Logical nodes can be adjusted
based on firmware or other settings whereas the physical nodes/dies are
fixed based on hardware topology.
The NodeId value can be used when a physical ID is needed by software.
Save the AMD NodeId to struct cpuinfo_x86.cpu_die_id. Use the value
from CPUID or MSR as appropriate. Default to phys_proc_id otherwise.
Do so for both AMD and Hygon systems.
Drop the node_id parameter from cacheinfo_*_init_llc_id() as it is no
longer needed.
Update the x86 topology documentation.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201109210659.754018-2-Yazen.Ghannam@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation/x86/amd-memory-encryption.rst')
0 files changed, 0 insertions, 0 deletions