Messages in this thread | | | From | Catalin Marinas <> | Subject | Re: [PATCH] arm64/fpsimd: Don't flush SME register hardware state along with thread | Date | Wed, 26 Jul 2023 19:45:10 +0100 |
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On Mon, 24 Jul 2023 14:09:19 +0100, Mark Brown wrote: > We recently changed the fpsimd thread flush to flush the physical SME > state as well as the thread state for the current thread. Unfortunately > this leads to intermittent corruption in interaction with the lazy > FPSIMD register switching. When under heavy load such as can be > triggered by the startup phase of fp-stress it is possible that the > current thread may not be scheduled prior to returning to userspace, and > indeed we may end up returning to the last thread that was scheduled on > the PE without ever exiting the kernel to any other task. If that > happens then we will not reload the register state from memory, leading > to loss of any SME register state. > > [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64/fpsimd: Don't flush SME register hardware state along with thread https://git.kernel.org/arm64/c/3421ddbe6d64
-- Catalin
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