From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:22668 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726656AbgCIIvl (ORCPT ); Mon, 9 Mar 2020 04:51:41 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0298pAlj071404 for ; Mon, 9 Mar 2020 04:51:40 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ym91dmfd8-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 09 Mar 2020 04:51:40 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 9 Mar 2020 08:51:38 -0000 From: Christian Borntraeger Subject: [GIT PULL 16/36] KVM: s390: protvirt: Handle spec exception loops Date: Mon, 9 Mar 2020 09:51:06 +0100 In-Reply-To: <20200309085126.3334302-1-borntraeger@de.ibm.com> References: <20200309085126.3334302-1-borntraeger@de.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: <20200309085126.3334302-17-borntraeger@de.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Paolo Bonzini Cc: KVM , Janosch Frank , David Hildenbrand , Claudio Imbrenda , Cornelia Huck , Michael Mueller , Vasily Gorbik , Ulrich Weigand , linux-s390 , Heiko Carstens From: Janosch Frank SIE intercept code 8 is used only on exception loops for protected guests. That means we need to stop the guest when we see it. This is done by userspace. Signed-off-by: Janosch Frank Reviewed-by: Thomas Huth Reviewed-by: Cornelia Huck Acked-by: David Hildenbrand [borntraeger@de.ibm.com: patch merging, splitting, fixing] Signed-off-by: Christian Borntraeger --- arch/s390/kvm/intercept.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index 00a79442a428..331e620dcfdf 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -231,6 +231,13 @@ static int handle_prog(struct kvm_vcpu *vcpu) vcpu->stat.exit_program_interruption++; + /* + * Intercept 8 indicates a loop of specification exceptions + * for protected guests. + */ + if (kvm_s390_pv_cpu_is_protected(vcpu)) + return -EOPNOTSUPP; + if (guestdbg_enabled(vcpu) && per_event(vcpu)) { rc = kvm_s390_handle_per_event(vcpu); if (rc) -- 2.24.1