On Sat, Oct 05, 2024 at 02:18:57PM +0100, Marc Zyngier wrote: > Mark Brown <broonie@xxxxxxxxxx> wrote: > > On Sat, Oct 05, 2024 at 12:34:20PM +0100, Marc Zyngier wrote: > > > Where is the handling of traps resulting of HFGITR_EL2.nGCSSTR_EL1? > > These will trap with an EC of 0x2d which isn't known so I was expecting > > this to get handled in the same way as for example a return of false > > from kvm_hyp_handle_fpsimd() for SVE when unsupported, or for the > > simiarly unknown SME EC, currently. I gather from your comment that > > you're instead expecting to see an explicit exit handler for this EC > > that just injects the UNDEF directly? > Not just inject an UNDEF directly, but also track whether this needs > to be forwarded when the guest's HFGITR_EL2.nGCSSTR_EL1 is 0 while not > being not RES0. Basically following what the pseudocode describes. Ah, I see. I'd been under the impression that the generic machinery was supposed to handle this already using the descriptions in emulate-nested.c and we only needed handlers for more specific actions.
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