From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3yx6BD58DFzDrWw for ; Wed, 13 Dec 2017 04:24:04 +1100 (AEDT) From: Laurent Vivier To: kvm-ppc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Paul Mackerras , Benjamin Herrenschmidt , Michael Ellerman , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH] KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp() Date: Tue, 12 Dec 2017 18:23:56 +0100 Message-Id: <20171212172356.2397-1-lvivier@redhat.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , When we migrate a VM from a POWER8 host (XICS) to a POWER9 host (XICS-on-XIVE), we have an error: qemu-kvm: Unable to restore KVM interrupt controller state \ (0xff000000) for CPU 0: Invalid argument This is because kvmppc_xics_set_icp() checks the new state is internaly consistent, and especially: ... 1129 if (xisr == 0) { 1130 if (pending_pri != 0xff) 1131 return -EINVAL; ... On the other side, kvmppc_xive_get_icp() doesn't set neither the pending_pri value, nor the xisr value (set to 0) (and kvmppc_xive_set_icp() ignores the pending_pri value) As xisr is 0, pending_pri must be set to 0xff. Signed-off-by: Laurent Vivier --- arch/powerpc/kvm/book3s_xive.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index bf457843e032..e79062573f8c 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -725,7 +725,8 @@ u64 kvmppc_xive_get_icp(struct kvm_vcpu *vcpu) /* Return the per-cpu state for state saving/migration */ return (u64)xc->cppr << KVM_REG_PPC_ICP_CPPR_SHIFT | - (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT; + (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT | + (u64)0xff << KVM_REG_PPC_ICP_PPRI_SHIFT; } int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval) -- 2.14.3