powerpc/fsl: Emulate SPRN_BUCSR register

commit 98518c4d8728656db349f875fcbbc7c126d4c973 upstream.

In order to flush the branch predictor the guest kernel performs
writes to the BUCSR register which is hypervisor privilleged. However,
the branch predictor is flushed at each KVM entry, so the branch
predictor has been already flushed, so just return as soon as possible
to guest.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
[mpe: Tweak comment formatting]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index 990db69a1d0b0f9a76d31ae1323fb6e23cb39a82..fa88f641ac033967ed2c1f49dd25402c6fdb92c7 100644 (file)
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -277,6 +277,13 @@ int kvmppc_core_emulate_mtspr_e500(struct kvm_vcpu *vcpu, int sprn, ulong spr_va
                vcpu->arch.pwrmgtcr0 = spr_val;
                break;
 
+       case SPRN_BUCSR:
+               /*
+                * If we are here, it means that we have already flushed the
+                * branch predictor, so just return to guest.
+                */
+               break;
+
        /* extra exceptions */
 #ifdef CONFIG_SPE_POSSIBLE
        case SPRN_IVOR32: