Messages in this thread | | | Date | Fri, 17 Mar 2023 15:07:37 +0000 | From | Catalin Marinas <> | Subject | Re: [PATCH 04/10] arm64: mops: document boot requirements for MOPS |
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On Thu, Feb 16, 2023 at 04:00:06PM +0000, Kristina Martsenko wrote: > + For CPUs with Memory Copy and Memory Set instructions (FEAT_MOPS): > + > + - If the kernel is entered at EL1 and EL2 is present: > + > + - HCRX_EL2.MSCEn (bit 11) must be initialised to 0b1. > + > + - HCRX_EL2.MCE2 (bit 10) must be initialised to 0b0.
Regarding MCE2, does EL1 actually care if EL2 wants to handle all the memcpy/memset exceptions? There may even be a valid case to do this at EL2 if you run a guest that uses these instructions but has no clue on how to deal with the specific exception like WrongOption.
-- Catalin
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