| 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 | } |