tree 41ffde50995fc379a45e6b55b26129eb5af1672a
parent d424c1862a2a31e1cb9bae56ec4b9f6976edbd32
author Fuad Tabba <tabba@google.com> 1613919934 +0000
committer Fuad Tabba <tabba@google.com> 1631691967 +0100

KVM: arm64: Handle protected guests at 32 bits

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 22f553842b14 ("KVM: arm64: Handle Asymmetric
AArch32 systems")

Signed-off-by: Fuad Tabba <tabba@google.com>