Re: [PATCH 0/2] x86/fpu: Extend kernel_fpu_begin_mask() for the In-Field Scan driver

From: Chang S. Bae
Date: Thu May 02 2024 - 16:53:05 EST


On 4/30/2024 2:25 PM, Chang S. Bae wrote:
The recent update [1] in the SDM highlights the requirement of
initializing the AMX state for executing the scan test:
"... maintaining AMX state in a non-initialized state ... will
prevent the execution of In-Field Scan tests."
which is one of CPU state conditions required for the test's execution.

This brief mention may prompt questions about why the hardware must refuse to run the test under these conditions. Because this is part of its internal, we'd go back to folks who wrote this test and will grab their write-up to provide the logic behind this requirement.

Thanks,
Chang