hw/s390x/s390-pci-kvm.c

   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 }