qemu/hw/s390x/s390-pci-kvm.c
Matthew Rosato 59d1ce4439 s390x/s390-virtio-ccw: add zpcii-disable machine property
The zpcii-disable machine property can be used to force-disable the use
of zPCI interpretation facilities for a VM.  By default, this setting
will be off for machine 7.2 and newer.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-Id: <20220902172737.170349-9-mjrosato@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Fix contextual conflict in ccw_machine_7_1_instance_options()]
Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-26 17:23:47 +02:00

55 lines
1.5 KiB
C

/*
* s390 zPCI KVM interfaces
*
* Copyright 2022 IBM Corp.
* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "qemu/osdep.h"
#include <linux/kvm.h>
#include "kvm/kvm_s390x.h"
#include "hw/s390x/pv.h"
#include "hw/s390x/s390-pci-bus.h"
#include "hw/s390x/s390-pci-kvm.h"
#include "hw/s390x/s390-pci-inst.h"
#include "cpu_models.h"
bool s390_pci_kvm_interp_allowed(void)
{
return (kvm_s390_get_zpci_op() && !s390_is_pv() &&
!object_property_get_bool(OBJECT(qdev_get_machine()),
"zpcii-disable", NULL));
}
int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist)
{
struct kvm_s390_zpci_op args = {
.fh = pbdev->fh,
.op = KVM_S390_ZPCIOP_REG_AEN,
.u.reg_aen.ibv = fib->aibv,
.u.reg_aen.sb = fib->aisb,
.u.reg_aen.noi = FIB_DATA_NOI(fib->data),
.u.reg_aen.isc = FIB_DATA_ISC(fib->data),
.u.reg_aen.sbo = FIB_DATA_AISBO(fib->data),
.u.reg_aen.flags = (assist) ? 0 : KVM_S390_ZPCIOP_REGAEN_HOST
};
return kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
}
int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
{
struct kvm_s390_zpci_op args = {
.fh = pbdev->fh,
.op = KVM_S390_ZPCIOP_DEREG_AEN
};
return kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
}