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@xxxxxxxxxxxxx>
---
hw/s390x/s390-pci-kvm.c | 4 +++-
hw/s390x/s390-virtio-ccw.c | 25 +++++++++++++++++++++++++
include/hw/s390x/s390-virtio-ccw.h | 1 +
qemu-options.hx | 8 +++++++-
util/qemu-config.c | 4 ++++
5 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/hw/s390x/s390-pci-kvm.c b/hw/s390x/s390-pci-kvm.c
index 9134fe185f..5eb7fd12e2 100644
--- a/hw/s390x/s390-pci-kvm.c
+++ b/hw/s390x/s390-pci-kvm.c
@@ -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)
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 9a2467c889..f8ecb6172c 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -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 = {
@@ -803,8 +825,11 @@ DEFINE_CCW_MACHINE(7_2, "7.2", true);
static void ccw_machine_7_1_instance_options(MachineState *machine)
{
+ S390CcwMachineState *ms = S390_CCW_MACHINE(machine);
+
ccw_machine_7_2_instance_options(machine);
s390_cpudef_featoff_greater(16, 1, S390_FEAT_PAIE);
+ ms->zpcii_disable = true;
}
static void ccw_machine_7_1_class_options(MachineClass *mc)
diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h
index 3331990e02..8a0090a071 100644
--- a/include/hw/s390x/s390-virtio-ccw.h
+++ b/include/hw/s390x/s390-virtio-ccw.h
@@ -27,6 +27,7 @@ struct S390CcwMachineState {
bool aes_key_wrap;
bool dea_key_wrap;
bool pv;
+ bool zpcii_disable;
uint8_t loadparm[8];
};
diff --git a/qemu-options.hx b/qemu-options.hx
index 31c04f7eea..7427dd1ed5 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -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,
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 433488aa56..5325f6bf80 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -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 */ }
}
