qemu

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/*
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 * s390 zPCI KVM interfaces
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 *
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 * Copyright 2022 IBM Corp.
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 * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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 *
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 * This work is licensed under the terms of the GNU GPL, version 2 or (at
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 * your option) any later version. See the COPYING file in the top-level
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 * directory.
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 */
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#include "qemu/osdep.h"
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#include <linux/kvm.h>
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#include "kvm/kvm_s390x.h"
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#include "target/s390x/kvm/pv.h"
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#include "hw/s390x/s390-pci-bus.h"
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#include "hw/s390x/s390-pci-kvm.h"
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#include "hw/s390x/s390-pci-inst.h"
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#include "hw/s390x/s390-pci-vfio.h"
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#include "cpu_models.h"
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bool s390_pci_kvm_interp_allowed(void)
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{
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    return kvm_s390_get_zpci_op() && !s390_is_pv();
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}
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int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist)
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{
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    int rc;
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    struct kvm_s390_zpci_op args = {
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        .fh = pbdev->fh,
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        .op = KVM_S390_ZPCIOP_REG_AEN,
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        .u.reg_aen.ibv = fib->aibv,
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        .u.reg_aen.sb = fib->aisb,
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        .u.reg_aen.noi = FIB_DATA_NOI(fib->data),
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        .u.reg_aen.isc = FIB_DATA_ISC(fib->data),
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        .u.reg_aen.sbo = FIB_DATA_AISBO(fib->data),
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        .u.reg_aen.flags = (assist) ? 0 : KVM_S390_ZPCIOP_REGAEN_HOST
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    };
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    if (pbdev->aif) {
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        return -EINVAL;
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    }
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    rc = kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
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    if (rc == 0) {
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        pbdev->aif = true;
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    }
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    return rc;
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}
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int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
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{
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    int rc;
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    struct kvm_s390_zpci_op args = {
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        .fh = pbdev->fh,
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        .op = KVM_S390_ZPCIOP_DEREG_AEN
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    };
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    if (!pbdev->aif) {
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        return -EINVAL;
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    }
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    /*
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     * The device may have already been reset but we still want to relinquish
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     * the guest ISC, so always be sure to use an up-to-date host fh.
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     */
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    if (!s390_pci_get_host_fh(pbdev, &args.fh)) {
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        return -EPERM;
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    }
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    rc = kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
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    if (rc == 0) {
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        pbdev->aif = false;
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    }
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    return rc;
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}
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