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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 31 Jan 2020 11:24:12 -0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00VBOBri60686546 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 31 Jan 2020 11:24:11 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8624842041; Fri, 31 Jan 2020 11:24:11 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 58D4042045; Fri, 31 Jan 2020 11:24:11 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.41]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 31 Jan 2020 11:24:11 +0000 (GMT) Subject: Re: [PATCH v10 1/6] KVM: s390: do not clobber registers during guest reset/store status To: Janosch Frank , kvm@vger.kernel.org Cc: thuth@redhat.com, david@redhat.com, cohuck@redhat.com, linux-s390@vger.kernel.org References: <20200131100205.74720-1-frankja@linux.ibm.com> <20200131100205.74720-2-frankja@linux.ibm.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20200131100205.74720-2-frankja@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20013111-0008-0000-0000-0000034E8812 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20013111-0009-0000-0000-00004A6F0BD0 Message-Id: <854c6008-ef7a-3d02-b231-3328872eaee6@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-31_03:2020-01-31,2020-01-31 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 phishscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2001310101 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 31.01.20 11:02, Janosch Frank wrote: > From: Christian Borntraeger > > The initial CPU reset clobbers the userspace fpc and the store status > ioctl clobbers the guest acrs + fpr. As these calls are only done via > ioctl (and not via vcpu_run), no CPU context is loaded, so we can (and > must) act directly on the sync regs, not on the thread context. > > Cc: stable@kernel.org > Fixes: e1788bb995be ("KVM: s390: handle floating point registers in the run ioctl not in vcpu_put/load") > Fixes: 31d8b8d41a7e ("KVM: s390: handle access registers in the run ioctl not in vcpu_put/load") > Signed-off-by: Christian Borntraeger > Reviewed-by: David Hildenbrand > Reviewed-by: Cornelia Huck > Signed-off-by: Janosch Frank Thanks applied. > --- > arch/s390/kvm/kvm-s390.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index d9e6bf3d54f0..876802894b35 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -2860,9 +2860,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) > vcpu->arch.sie_block->gcr[14] = CR14_UNUSED_32 | > CR14_UNUSED_33 | > CR14_EXTERNAL_DAMAGE_SUBMASK; > - /* make sure the new fpc will be lazily loaded */ > - save_fpu_regs(); > - current->thread.fpu.fpc = 0; > + vcpu->run->s.regs.fpc = 0; > vcpu->arch.sie_block->gbea = 1; > vcpu->arch.sie_block->pp = 0; > vcpu->arch.sie_block->fpf &= ~FPF_BPBC; > @@ -4351,7 +4349,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp, > switch (ioctl) { > case KVM_S390_STORE_STATUS: > idx = srcu_read_lock(&vcpu->kvm->srcu); > - r = kvm_s390_vcpu_store_status(vcpu, arg); > + r = kvm_s390_store_status_unloaded(vcpu, arg); > srcu_read_unlock(&vcpu->kvm->srcu, idx); > break; > case KVM_S390_SET_INITIAL_PSW: { >