tree 330247d49971d941637fc46a524f7a9d3672162a
parent cb7413720944a1d34c9ceca913171d78706ecff5
author Pierre-Clément Tosi <ptosi@google.com> 1685982069 +0000
committer Pierre-Clément Tosi <ptosi@google.com> 1686142827 +0000

KVM: arm64: nvhe: Improve CFI failure reporting

Report (at EL1) the branch target that caused an nVHE hypervisor
CONFIG_CFI_CLANG failure (at EL2) and the type that was expected by
recording them during hyp_panic() and making them available through
per-CPU variable.

As handlers for CFI failures are expected to extract the target and type
from CPU registers (KCFI encodes the indices in the BRK instruction,
resulting in them being available through the ESR comment), hyp_panic()
must have access to the hypervisor CPU context so populate the GPRs of
the per-CPU kvm_hyp_ctxt before branching to the function from the
"invalid" EL2 vector handlers (although only doing so from the
synchrnous ones should suffice).

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>