1 /* 2 * s390 zPCI KVM interfaces 3 * 4 * Copyright 2022 IBM Corp. 5 * Author(s): Matthew Rosato <mjrosato@linux.ibm.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or (at 8 * your option) any later version. See the COPYING file in the top-level 9 * directory. 10 */ 11 12 #include "qemu/osdep.h" 13 14 #include <linux/kvm.h> 15 16 #include "kvm/kvm_s390x.h" 17 #include "target/s390x/kvm/pv.h" 18 #include "hw/s390x/s390-pci-bus.h" 19 #include "hw/s390x/s390-pci-kvm.h" 20 #include "hw/s390x/s390-pci-inst.h" 21 #include "hw/s390x/s390-pci-vfio.h" 22 #include "cpu_models.h" 23 24 bool s390_pci_kvm_interp_allowed(void) 25 { 26 return kvm_s390_get_zpci_op() && !s390_is_pv(); 27 } 28 29 int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist) 30 { 31 int rc; 32 struct kvm_s390_zpci_op args = { 33 .fh = pbdev->fh, 34 .op = KVM_S390_ZPCIOP_REG_AEN, 35 .u.reg_aen.ibv = fib->aibv, 36 .u.reg_aen.sb = fib->aisb, 37 .u.reg_aen.noi = FIB_DATA_NOI(fib->data), 38 .u.reg_aen.isc = FIB_DATA_ISC(fib->data), 39 .u.reg_aen.sbo = FIB_DATA_AISBO(fib->data), 40 .u.reg_aen.flags = (assist) ? 0 : KVM_S390_ZPCIOP_REGAEN_HOST 41 }; 42 43 if (pbdev->aif) { 44 return -EINVAL; 45 } 46 47 rc = kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args); 48 if (rc == 0) { 49 pbdev->aif = true; 50 } 51 52 return rc; 53 } 54 55 int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev) 56 { 57 int rc; 58 59 struct kvm_s390_zpci_op args = { 60 .fh = pbdev->fh, 61 .op = KVM_S390_ZPCIOP_DEREG_AEN 62 }; 63 64 if (!pbdev->aif) { 65 return -EINVAL; 66 } 67 68 /* 69 * The device may have already been reset but we still want to relinquish 70 * the guest ISC, so always be sure to use an up-to-date host fh. 71 */ 72 if (!s390_pci_get_host_fh(pbdev, &args.fh)) { 73 return -EPERM; 74 } 75 76 rc = kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args); 77 if (rc == 0) { 78 pbdev->aif = false; 79 } 80 81 return rc; 82 } 83