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Commit 98518c4d authored by Diana Craciun's avatar Diana Craciun Committed by Michael Ellerman
Browse files

powerpc/fsl: Emulate SPRN_BUCSR register 



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: default avatarDiana Craciun <diana.craciun@nxp.com>
[mpe: Tweak comment formatting]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 7d8bad99

arch/powerpc/kvm/e500_emulate.c

+7 −0
Original line number Diff line number Diff line
@@ -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: