KVM: arm64: Handle protected guests at 32 bits

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Protected KVM does not support protected AArch32 guests. However,
it is possible for the guest to force run AArch32, potentially
causing problems. Add an extra check so that if the hypervisor
catches the guest doing that, it can prevent the guest from
running again by resetting vcpu->arch.target and returning
ARM_EXCEPTION_IL.

If this were to happen, The VMM can try and fix it by re-
initializing the vcpu with KVM_ARM_VCPU_INIT, however, this is
likely not possible for protected VMs.

Adapted from commit 22f553842b ("KVM: arm64: Handle Asymmetric
AArch32 systems")

Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211010145636.1950948-12-tabba@google.com

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Fuad Tabba 2021-10-10 15:56:36 +01:00 • committed by Marc Zyngier

parent 1423afcb41

commit 5f39efc420

1 changed files with 34 additions and 0 deletions

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arch/arm64/kvm/hyp/nvhe/switch.c

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