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The Zen microarchitecture supports SMT, and our AMD microcode update code will cause hardware threads to attempt the update simultaneously. The Intel SDM explicitly warns against doing this. AMD does not have any public-facing documentation about microcode updates that I can find, but Linux serializes updates with a lock as well, so do the same here.

The Zen microarchitecture supports SMT, and our AMD microcode update code will cause hardware threads to attempt the update simultaneously. The Intel SDM explicitly warns against doing this. AMD does not have any public-facing documentation about microcode updates that I can find, but Linux serializes updates with a lock, so do the same here.

The Zen microarchitecture supports SMT, and our AMD microcode update code will cause hardware threads to attempt the update simultaneously. The Intel SDM explicitly warns against doing this. AMD does not have any public-facing documentation about microcode updates that I can find, but Linux serializes updates with a lock as well, so do the same here.