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Mon, 13 Dec 2021 15:18:41 +0000 (GMT) Received: from [9.171.24.181] (unknown [9.171.24.181]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 13 Dec 2021 15:18:41 +0000 (GMT) Message-ID: Date: Mon, 13 Dec 2021 16:19:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH 13/32] KVM: s390: pci: add basic kvm_zdev structure Content-Language: en-US To: Matthew Rosato , linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20211207205743.150299-1-mjrosato@linux.ibm.com> <20211207205743.150299-14-mjrosato@linux.ibm.com> From: Pierre Morel In-Reply-To: <20211207205743.150299-14-mjrosato@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rSI15PzhNDuwU-qlx9iKgDoy34c4yj0- X-Proofpoint-ORIG-GUID: _ipOZ6z_rw--l-QfZAxZGL3YvHZXoRms X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-13_06,2021-12-13_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 phishscore=0 spamscore=0 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 adultscore=0 clxscore=1015 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112130097 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/7/21 21:57, Matthew Rosato wrote: > This structure will be used to carry kvm passthrough information related to > zPCI devices. > > Signed-off-by: Matthew Rosato > --- > arch/s390/include/asm/kvm_pci.h | 29 +++++++++++++++++ > arch/s390/include/asm/pci.h | 3 ++ > arch/s390/kvm/Makefile | 2 +- > arch/s390/kvm/pci.c | 57 +++++++++++++++++++++++++++++++++ > 4 files changed, 90 insertions(+), 1 deletion(-) > create mode 100644 arch/s390/include/asm/kvm_pci.h > create mode 100644 arch/s390/kvm/pci.c > > diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h > new file mode 100644 > index 000000000000..3e491a39704c > --- /dev/null > +++ b/arch/s390/include/asm/kvm_pci.h > @@ -0,0 +1,29 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * KVM PCI Passthrough for virtual machines on s390 > + * > + * Copyright IBM Corp. 2021 > + * > + * Author(s): Matthew Rosato > + */ > + > + > +#ifndef ASM_KVM_PCI_H > +#define ASM_KVM_PCI_H > + > +#include > +#include > +#include > +#include > +#include > + > +struct kvm_zdev { > + struct zpci_dev *zdev; > + struct kvm *kvm; > +}; > + > +extern int kvm_s390_pci_dev_open(struct zpci_dev *zdev); > +extern void kvm_s390_pci_dev_release(struct zpci_dev *zdev); > +extern int kvm_s390_pci_attach_kvm(struct zpci_dev *zdev, struct kvm *kvm); > + > +#endif /* ASM_KVM_PCI_H */ > diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h > index 86f43644756d..32810e1ed308 100644 > --- a/arch/s390/include/asm/pci.h > +++ b/arch/s390/include/asm/pci.h > @@ -97,6 +97,7 @@ struct zpci_bar_struct { > }; > > struct s390_domain; > +struct kvm_zdev; > > #define ZPCI_FUNCTIONS_PER_BUS 256 > struct zpci_bus { > @@ -190,6 +191,8 @@ struct zpci_dev { > struct dentry *debugfs_dev; > > struct s390_domain *s390_domain; /* s390 IOMMU domain data */ > + > + struct kvm_zdev *kzdev; /* passthrough data */ > }; > > static inline bool zdev_enabled(struct zpci_dev *zdev) > diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile > index b3aaadc60ead..95ea865e5d29 100644 > --- a/arch/s390/kvm/Makefile > +++ b/arch/s390/kvm/Makefile > @@ -10,6 +10,6 @@ common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o \ > ccflags-y := -Ivirt/kvm -Iarch/s390/kvm > > kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o > -kvm-objs += diag.o gaccess.o guestdbg.o vsie.o pv.o > +kvm-objs += diag.o gaccess.o guestdbg.o vsie.o pv.o pci.o > > obj-$(CONFIG_KVM) += kvm.o > diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c > new file mode 100644 > index 000000000000..ecfc458a5b39 > --- /dev/null > +++ b/arch/s390/kvm/pci.c > @@ -0,0 +1,57 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * s390 kvm PCI passthrough support > + * > + * Copyright IBM Corp. 2021 > + * > + * Author(s): Matthew Rosato > + */ > + > +#include > +#include > +#include > + > +int kvm_s390_pci_dev_open(struct zpci_dev *zdev) > +{ > + struct kvm_zdev *kzdev; > + > + if (zdev == NULL) > + return -ENODEV; This check is not needed, why should this function be called with a NULL argument and the only caller at the moment already check it. > + > + kzdev = kzalloc(sizeof(struct kvm_zdev), GFP_KERNEL); > + if (!kzdev) > + return -ENOMEM; > + > + kzdev->zdev = zdev; > + zdev->kzdev = kzdev; > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(kvm_s390_pci_dev_open); > + > +void kvm_s390_pci_dev_release(struct zpci_dev *zdev) > +{ > + struct kvm_zdev *kzdev; > + > + if (!zdev || !zdev->kzdev) > + return; same here > + > + kzdev = zdev->kzdev; > + WARN_ON(kzdev->zdev != zdev); > + zdev->kzdev = 0; > + kfree(kzdev); > + > +} > +EXPORT_SYMBOL_GPL(kvm_s390_pci_dev_release); > + > +int kvm_s390_pci_attach_kvm(struct zpci_dev *zdev, struct kvm *kvm) > +{ > + struct kvm_zdev *kzdev = zdev->kzdev; > + > + if (!kzdev) > + return -ENODEV; and here > + > + kzdev->kvm = kvm; > + return 0; > +} > +EXPORT_SYMBOL_GPL(kvm_s390_pci_attach_kvm); > -- Pierre Morel IBM Lab Boeblingen