Re: [Android-virt] [PATCH v5 00/13] KVM/ARM Implementation

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On 1 February 2012 12:11, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> The obvious fix would be to test for the virt extensions in ID_PFR1
> before enabling KVM, and mask out the virt extensions from the same
> register in the guest by trapping CP15-c0. But c0 is used by cache
> maintenance operations, and trapping would lead to unacceptable
> performance degradation.

You can just set HCR.TID3 to get hyp traps on only the feature
ID registers, right? (traps access to only ID_PFR0, ID_PFR1, ID_DFR0,
ID_AFR0, ID_MMFR0, ID_MMFR1, ID_MMFR2, ID_MMFR3, ID_ISAR0, ID_ISAR1,
ID_ISAR2, ID_ISAR3, ID_ISAR4, ID_ISAR5, MVFR0, and MVFR1, none
of which should be on performance-critical paths I hope.)

-- PMM
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