Subject: Re: [PATCH v11 27/40] KVM: arm64: Trap SME usage in guest

From: Catalin Marinas <[email-masked]>
Date: Wed, 23 Feb 2022 15:34:31 +0000

On Mon, Feb 07, 2022 at 03:20:56PM +0000, Mark Brown wrote:
> SME defines two new traps which need to be enabled for guests to ensure
> that they can't use SME, one for the main SME operations which mirrors the
> traps for SVE and another for access to TPIDR2 in SCTLR_EL2.
> 
> For VHE manage SMEN along with ZEN in activate_traps() and the FP state
> management callbacks, along with SCTLR_EL2.EnTPIDR2.  There is no
> existing dynamic management of SCTLR_EL2.
> 
> For nVHE manage TSM in activate_traps() along with the fine grained
> traps for TPIDR2 and SMPRI.  There is no existing dynamic management of
> fine grained traps.
> 
> Signed-off-by: Mark Brown <[email-masked]>

This looks alright to me but I'm not a kvm expert. FWIW:

Reviewed-by: Catalin Marinas <[email-masked]>

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