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Mon, 18 May 2020 09:15:03 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 04I9F0Wv42729696 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 18 May 2020 09:15:00 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D5AB64C05E; Mon, 18 May 2020 09:15:00 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 613B74C044; Mon, 18 May 2020 09:15:00 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.6.241]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 18 May 2020 09:15:00 +0000 (GMT) Subject: Re: [PATCH v7 3/3] s390/kvm: diagnose 0x318 get/set handling To: Collin Walling , kvm@vger.kernel.org, linux-s390@vger.kernel.org Cc: pbonzini@redhat.com, frankja@linux.ibm.com, david@redhat.com, cohuck@redhat.com, imbrenda@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, thuth@redhat.com References: <20200515221935.18775-1-walling@linux.ibm.com> <20200515221935.18775-4-walling@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/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200515221935.18775-4-walling@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.676 definitions=2020-05-18_03:2020-05-15,2020-05-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 cotscore=-2147483648 phishscore=0 malwarescore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005180081 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 16.05.20 00:19, Collin Walling wrote: > DIAGNOSE 0x318 (diag 318) sets information regarding the environment > the VM is running in (Linux, z/VM, etc) and is observed via > firmware/service events. > > This is a privileged s390x instruction that must be intercepted by > SIE. Userspace handling is required, so let's introduce some functions > to communicate between userspace and KVM via ioctls. These will be used > to get/set the diag 318 related information. > > The Control Program Name Code (CPNC) is stored in the SIE block. The > CPNC along with the Control Program Version Code (CPVC) are stored in > the kvm_arch struct. > > Signed-off-by: Collin Walling > --- > Documentation/virt/kvm/devices/vm.rst | 21 +++++++ > arch/s390/include/asm/kvm_host.h | 5 +- > arch/s390/include/uapi/asm/kvm.h | 4 ++ > arch/s390/kvm/kvm-s390.c | 82 +++++++++++++++++++++++++++ > arch/s390/kvm/vsie.c | 2 + > 5 files changed, 113 insertions(+), 1 deletion(-) > > diff --git a/Documentation/virt/kvm/devices/vm.rst b/Documentation/virt/kvm/devices/vm.rst > index 0aa5b1cfd700..52cc906dd7bd 100644 > --- a/Documentation/virt/kvm/devices/vm.rst > +++ b/Documentation/virt/kvm/devices/vm.rst > @@ -314,3 +314,24 @@ Allows userspace to query the status of migration mode. > if it is enabled > :Returns: -EFAULT if the given address is not accessible from kernel space; > 0 in case of success. > + > +6. GROUP: KVM_S390_VM_MISC > +========================== > + > +:Architectures: s390 > + > +6.1. KVM_S390_VM_MISC_DIAG_318 (r/w) > +----------------------------------- > + > +Allows userspace to retrieve and set the DIAGNOSE 0x318 information, > +which consists of a 1-byte "Control Program Name Code" and a 7-byte > +"Control Program Version Code" (a 64 bit value all in all). This > +information is set by the guest (usually during IPL). This interface is > +intended to allow retrieving and setting it during migration; while no > +real harm is done if the information is changed outside of migration, > +it is strongly discouraged. > + > +:Parameters: address of a buffer in user space (u64), where the > + information is read from or stored into > +:Returns: -EFAULT if the given address is not accessible from kernel space; > + 0 in case of success An alternative would be a new sync_reg value + KVM capability.