KVM: arm64: Propagate PTW errors up to AT emulation

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KVM's software PTW will soon support 'hardware' updates to the access
flag. Similar to fault handling, races to update the descriptor will be
handled by restarting the instruction. Prepare for this by propagating
errors up to the AT emulation, only retiring the instruction if the walk
succeeds.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Link: https://msgid.link/20251124190158.177318-12-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 11:01:53 -08:00

parent f6927b41d5

commit 92c6443222

3 changed files with 39 additions and 19 deletions

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6

arch/arm64/include/asm/kvm_asm.h

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43

arch/arm64/kvm/at.c

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9

arch/arm64/kvm/sys_regs.c

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