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s390x/s390-virtio-ccw: add zpcii-disable machine property

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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>
This commit is contained in:
Matthew Rosato 2022-09-02 13:27:37 -04:00 committed by Thomas Huth
parent 9ee8f7e46a
commit 59d1ce4439
5 changed files with 39 additions and 2 deletions
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4
hw/s390x/s390-pci-kvm.c
View file

@ -22,7 +22,9 @@
bool s390_pci_kvm_interp_allowed(void)
{
return kvm_s390_get_zpci_op() && !s390_is_pv();
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)

24
hw/s390x/s390-virtio-ccw.c
View file

@ -645,6 +645,21 @@ static inline void machine_set_dea_key_wrap(Object *obj, bool value,
ms->dea_key_wrap = value;
}
static inline bool machine_get_zpcii_disable(Object *obj, Error **errp)
{
S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
return ms->zpcii_disable;
}
static inline void machine_set_zpcii_disable(Object *obj, bool value,
Error **errp)
{
S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
ms->zpcii_disable = value;
}
static S390CcwMachineClass *current_mc;
/*
@ -740,6 +755,13 @@ static inline void s390_machine_initfn(Object *obj)
"Up to 8 chars in set of [A-Za-z0-9. ] (lower case chars converted"
" to upper case) to pass to machine loader, boot manager,"
" and guest kernel");
object_property_add_bool(obj, "zpcii-disable",
machine_get_zpcii_disable,
machine_set_zpcii_disable);
object_property_set_description(obj, "zpcii-disable",
"disable zPCI interpretation facilties");
object_property_set_bool(obj, "zpcii-disable", false, NULL);
}
static const TypeInfo ccw_machine_info = {
@ -804,10 +826,12 @@ DEFINE_CCW_MACHINE(7_2, "7.2", true);
static void ccw_machine_7_1_instance_options(MachineState *machine)
{
static const S390FeatInit qemu_cpu_feat = { S390_FEAT_LIST_QEMU_V7_1 };
S390CcwMachineState *ms = S390_CCW_MACHINE(machine);
ccw_machine_7_2_instance_options(machine);
s390_cpudef_featoff_greater(16, 1, S390_FEAT_PAIE);
s390_set_qemu_cpu_model(0x8561, 15, 1, qemu_cpu_feat);
ms->zpcii_disable = true;
}
static void ccw_machine_7_1_class_options(MachineClass *mc)

1
include/hw/s390x/s390-virtio-ccw.h
View file

@ -27,6 +27,7 @@ struct S390CcwMachineState {
bool aes_key_wrap;
bool dea_key_wrap;
bool pv;
bool zpcii_disable;
uint8_t loadparm[8];
};

8
qemu-options.hx
View file

@ -37,7 +37,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
" memory-encryption=@var{} memory encryption object to use (default=none)\n"
" hmat=on|off controls ACPI HMAT support (default=off)\n"
" memory-backend='backend-id' specifies explicitly provided backend for main RAM (default=none)\n"
" cxl-fmw.0.targets.0=firsttarget,cxl-fmw.0.targets.1=secondtarget,cxl-fmw.0.size=size[,cxl-fmw.0.interleave-granularity=granularity]\n",
" cxl-fmw.0.targets.0=firsttarget,cxl-fmw.0.targets.1=secondtarget,cxl-fmw.0.size=size[,cxl-fmw.0.interleave-granularity=granularity]\n"
" zpcii-disable=on|off disables zPCI interpretation facilities (default=off)\n",
QEMU_ARCH_ALL)
SRST
``-machine [type=]name[,prop=value[,...]]``
@ -157,6 +158,11 @@ SRST
::
-machine cxl-fmw.0.targets.0=cxl.0,cxl-fmw.0.targets.1=cxl.1,cxl-fmw.0.size=128G,cxl-fmw.0.interleave-granularity=512k
``zpcii-disable=on|off``
Disables zPCI interpretation facilties on s390-ccw hosts.
This feature can be used to disable hardware virtual assists
related to zPCI devices. The default is off.
ERST
DEF("M", HAS_ARG, QEMU_OPTION_M,

4
util/qemu-config.c
View file

@ -236,6 +236,10 @@ static QemuOptsList machine_opts = {
.help = "Up to 8 chars in set of [A-Za-z0-9. ](lower case chars"
" converted to upper case) to pass to machine"
" loader, boot manager, and guest kernel",
},{
.name = "zpcii-disable",
.type = QEMU_OPT_BOOL,
.help = "disable zPCI interpretation facilities",
},
{ /* End of list */ }
}