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[Qemu-devel] [PATCH RFC 4/9] s390x/css: add s390-map-css machine option
From: |
Xiao Feng Ren |
Subject: |
[Qemu-devel] [PATCH RFC 4/9] s390x/css: add s390-map-css machine option |
Date: |
Fri, 29 Apr 2016 14:13:18 +0200 |
We want to support real (i.e. not virtual) channel devices
even for guests that do not support MCSS-E (where guests may
see devices from any channel subsystem image at once). As all
virtio-ccw devices are in css 0xfe (and show up in the default
css 0 for guests not activating MCSS-E), we need an option to
map e.g. passed-through channel devices from their real css (0-3,
or 0 for hosts not activating MCSS-E) into the default css.
This will be exploited in a later patch.
Signed-off-by: Xiao Feng Ren <address@hidden>
---
hw/s390x/s390-virtio-ccw.c | 23 +++++++++++++++++++++++
include/hw/s390x/s390-virtio-ccw.h | 1 +
qemu-options.hx | 6 +++++-
target-s390x/cpu.h | 10 ++++++++++
4 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index e3df9c7..c4706b7 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -237,6 +237,21 @@ static inline void machine_set_dea_key_wrap(Object *obj,
bool value,
ms->dea_key_wrap = value;
}
+static inline bool machine_get_map_css(Object *obj, Error **errp)
+{
+ S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
+
+ return ms->s390_map_css;
+}
+
+static inline void machine_set_map_css(Object *obj, bool value,
+ Error **errp)
+{
+ S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
+
+ ms->s390_map_css = value;
+}
+
static inline void s390_machine_initfn(Object *obj)
{
object_property_add_bool(obj, "aes-key-wrap",
@@ -254,6 +269,14 @@ static inline void s390_machine_initfn(Object *obj)
"enable/disable DEA key wrapping using the CPACF wrapping key",
NULL);
object_property_set_bool(obj, true, "dea-key-wrap", NULL);
+
+ object_property_add_bool(obj, "s390-map-css",
+ machine_get_map_css,
+ machine_set_map_css, NULL);
+ object_property_set_description(obj, "s390-map-css",
+ "enable/disable mapping passed-through ccw devices into the "
+ "virtual css", NULL);
+ object_property_set_bool(obj, false, "s390-map-css", NULL);
}
static const TypeInfo ccw_machine_info = {
diff --git a/include/hw/s390x/s390-virtio-ccw.h
b/include/hw/s390x/s390-virtio-ccw.h
index ab08332..e99f1dd 100644
--- a/include/hw/s390x/s390-virtio-ccw.h
+++ b/include/hw/s390x/s390-virtio-ccw.h
@@ -28,6 +28,7 @@ typedef struct S390CcwMachineState {
/*< public >*/
bool aes_key_wrap;
bool dea_key_wrap;
+ bool s390_map_css;
} S390CcwMachineState;
typedef struct S390CcwMachineClass {
diff --git a/qemu-options.hx b/qemu-options.hx
index 6106520..ce055a7 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -44,7 +44,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
" dea-key-wrap=on|off controls support for DEA key wrapping
(default=on)\n"
" suppress-vmdesc=on|off disables self-describing migration
(default=off)\n"
" nvdimm=on|off controls NVDIMM support (default=off)\n"
- " enforce-config-section=on|off enforce configuration
section migration (default=off)\n",
+ " enforce-config-section=on|off enforce configuration
section migration (default=off)\n"
+ " s390-map-css=on|off controls support for mapping into
virtual css (default=off)\n",
QEMU_ARCH_ALL)
STEXI
@item -machine address@hidden,address@hidden,...]]
@@ -85,6 +86,9 @@ controls whether DEA wrapping keys will be created to allow
execution of DEA cryptographic functions. The default is on.
@item nvdimm=on|off
Enables or disables NVDIMM support. The default is off.
address@hidden s390-map-css=on|off
+Enables or disables mapping passed-through ccw devices into the virtual css.
+The default is off.
@end table
ETEXI
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 6d97c08..aab0481 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -1279,6 +1279,16 @@ static inline bool vregs_needed(void *opaque)
}
#endif
+static inline bool s390_get_map_css(void)
+{
+ if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-map-css",
+ NULL)) {
+ return true;
+ }
+
+ return false;
+}
+
/* machine check interruption code */
/* subclasses */
--
2.6.6
- [Qemu-devel] [PATCH RFC 0/9] basic channel IO passthrough infrastructure based on vfio, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 2/9] vfio: No-IOMMU mode support, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 3/9] s390x/css: introduce ccw chain interfaces, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 1/9] vfio: linux-headers update for vfio-ccw, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 5/9] s390x/css: realize css_sch_build_schib, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 7/9] vfio/ccw: vfio based ccw passthrough driver, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 4/9] s390x/css: add s390-map-css machine option,
Xiao Feng Ren <=
- [Qemu-devel] [PATCH RFC 8/9] s390x/css: introduce and realize ccw-request callback, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 9/9] s390x/css: ccws translation infrastructure, Xiao Feng Ren, 2016/04/29
- [Qemu-devel] [PATCH RFC 6/9] s390x/css: device and bus support for s390-ccw passthrough, Xiao Feng Ren, 2016/04/29