KVM: arm64: pkvm: Give priority to standard traps over pvm handling

Checking for pvm handling first means that we cannot handle ptrauth
traps or apply any of the workarounds (GICv3 or TX2 torvalds#219).

Flip the order around.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20211013120346.2926621-12-maz@kernel.org

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

@@ -167,10 +167,13 @@ static void __pmu_switch_to_host(struct kvm_cpu_context *host_ctxt)
  */
 static bool kvm_handle_pvm_sys64(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
- if (kvm_handle_pvm_sysreg(vcpu, exit_code))
- return true;
-
- return kvm_hyp_handle_sysreg(vcpu, exit_code);
+ /*
+ * Make sure we handle the exit for workarounds and ptrauth
+ * before the pKVM handling, as the latter could decide to
+ * UNDEF.
+ */
+ return (kvm_hyp_handle_sysreg(vcpu, exit_code) ||
+ kvm_handle_pvm_sysreg(vcpu, exit_code));
 }
 
 /**