KVM: arm64: Implement HW access flag management in stage-1 SW PTW

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Atomically update the Access flag at stage-1 when the guest has
configured the MMU to do so. Make the implementation choice (and liberal
interpretation of speculation) that any access type updates the Access
flag, including AT and CMO instructions.

Restart the entire walk by returning to the exception-generating
instruction in the case of a failed Access flag update.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Link: https://msgid.link/20251124190158.177318-13-oupton@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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This commit is contained in:

Oliver Upton 2025-11-24 11:01:54 -08:00

parent 92c6443222

commit bff8aa213d

2 changed files with 32 additions and 2 deletions

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arch/arm64/include/asm/kvm_nested.h

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33

arch/arm64/kvm/at.c

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