diff options
| author | James Morse <james.morse@arm.com> | 2016-04-27 17:47:04 +0100 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-11-17 09:49:38 +0800 |
| commit | 6f7056c069f26c3dca1d94778708b91d5dbdb8a0 (patch) | |
| tree | 0eae06840e0e42fdb0c5b5881f6c6ec52f8f28d0 /arch/arm64/kvm | |
| parent | 1520ad1a147e2edd7cd65dd9ddcbbd222fdbe5cc (diff) | |
arm64: hyp/kvm: Make hyp-stub reject kvm_call_hyp()
A later patch implements kvm_arch_hardware_disable(), to remove kvm
from el2, and re-instate the hyp-stub.
This can happen while guests are running, particularly when kvm_reboot()
calls kvm_arch_hardware_disable() on each cpu. This can interrupt a guest,
remove kvm, then allow the guest to be scheduled again. This causes
kvm_call_hyp() to be run against the hyp-stub.
Change the hyp-stub to return a new exception type when this happens,
and add code to kvm's handle_exit() to tell userspace we failed to
enter the guest.
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit c94b0cf28281d483c8b43b4874fcb7ab14ade1b1)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/handle_exit.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 198cf10b262d..25006a7a5316 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -183,6 +183,13 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, exit_handler = kvm_get_exit_handler(vcpu); return exit_handler(vcpu, run); + case ARM_EXCEPTION_HYP_GONE: + /* + * EL2 has been reset to the hyp-stub. This happens when a guest + * is pre-empted by kvm_reboot()'s shutdown call. + */ + run->exit_reason = KVM_EXIT_FAIL_ENTRY; + return 0; default: kvm_pr_unimpl("Unsupported exception type: %d", exception_index); |