KVM: arm64: nv: Add basic emulation of AT S1E{0,1}{R,W}

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Emulating AT instructions is one the tasks devolved to the host
hypervisor when NV is on.

Here, we take the basic approach of emulating AT S1E{0,1}{R,W}
using the AT instructions themselves. While this mostly work,
it doesn't *always* work:

- S1 page tables can be swapped out

- shadow S2 can be incomplete and not contain mappings for
  the S1 page tables

We are not trying to handle these case here, and defer it to
a later patch. Suitable comments indicate where we are in dire
need of better handling.

Co-developed-by: Jintack Lim <jintack.lim@linaro.org>
Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>

...

This commit is contained in:

Marc Zyngier 2024-06-19 08:29:20 +01:00

parent 90659853fe

commit 477e89cabb

3 changed files with 142 additions and 1 deletions

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1

arch/arm64/include/asm/kvm_asm.h

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2

arch/arm64/kvm/Makefile

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140

arch/arm64/kvm/at.c

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