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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 30 Jan 2020 09:58:58 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00U9wvND66257048 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 30 Jan 2020 09:58:57 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C232BAE053; Thu, 30 Jan 2020 09:58:57 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89680AE045; Thu, 30 Jan 2020 09:58:57 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.96.40]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 30 Jan 2020 09:58:57 +0000 (GMT) Subject: Re: [PATCH v8 1/4] KVM: s390: Add new reset vcpu API To: Janosch Frank , kvm@vger.kernel.org Cc: thuth@redhat.com, david@redhat.com, cohuck@redhat.com, linux-s390@vger.kernel.org References: <20200129200312.3200-1-frankja@linux.ibm.com> <20200129200312.3200-2-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: <20200129200312.3200-2-frankja@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20013009-0028-0000-0000-000003D5CBB2 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20013009-0029-0000-0000-0000249A19E0 Message-Id: <59091e9d-5a4d-6151-bb4d-0f6e46b93808@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-30_02:2020-01-28,2020-01-30 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=579 clxscore=1015 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 spamscore=0 mlxscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2001300070 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 29.01.20 21:03, Janosch Frank wrote: [...]> +static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) > +{ > + /* Initial reset is a superset of the normal reset */ > + kvm_arch_vcpu_ioctl_normal_reset(vcpu); > + > + /* this equals initial cpu reset in pop, but we don't switch to ESA */ > + vcpu->arch.sie_block->gpsw.mask = 0; > + vcpu->arch.sie_block->gpsw.addr = 0; > + kvm_s390_set_prefix(vcpu, 0); > + kvm_s390_set_cpu_timer(vcpu, 0); > + vcpu->arch.sie_block->ckc = 0; > + vcpu->arch.sie_block->todpr = 0; > + memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); > + vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; > + vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; > + /* make sure the new fpc will be lazily loaded */ > + save_fpu_regs(); see my other patch. We should rebase this series and fix it here as well > + current->thread.fpu.fpc = 0; > + vcpu->arch.sie_block->gbea = 1; > + vcpu->arch.sie_block->pp = 0; > + vcpu->arch.sie_block->fpf &= ~FPF_BPBC; > +} > + > +static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) > +{ > + struct kvm_sync_regs *regs = &vcpu->run->s.regs; > + > + /* Clear reset is a superset of the initial reset */ > + kvm_arch_vcpu_ioctl_initial_reset(vcpu); > + > + memset(®s->gprs, 0, sizeof(regs->gprs)); > + memset(®s->vrs, 0, sizeof(regs->vrs)); > + memset(®s->acrs, 0, sizeof(regs->acrs)); > + > + regs->etoken = 0; > + regs->etoken_extension = 0; > + > + memset(®s->gscb, 0, sizeof(regs->gscb)); > + if (MACHINE_HAS_GS) { > + preempt_disable(); > + __ctl_set_bit(2, 4); > + if (current->thread.gs_cb) { > + vcpu->arch.host_gscb = current->thread.gs_cb; > + save_gs_cb(vcpu->arch.host_gscb); > + } > + if (vcpu->arch.gs_enabled) { > + current->thread.gs_cb = (struct gs_cb *) > + &vcpu->run->s.regs.gscb; > + restore_gs_cb(current->thread.gs_cb); > + } > + preempt_enable(); > + } I think this hunk can go? (same reason as for floating point) Other than that this looks good.