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[PATCH v1 1/8] qdev-properties: Add read-only 64 bit property
From: |
Maxim Davydov |
Subject: |
[PATCH v1 1/8] qdev-properties: Add read-only 64 bit property |
Date: |
Wed, 1 Sep 2021 12:07:57 +0300 |
In some situations, we need a property that tracks the bit but
can't change it (for instance, guest features of virtio device).
Signed-off-by: Maxim Davydov <maxim.davydov@virtuozzo.com>
---
hw/core/qdev-properties.c | 32 ++++++++++++++++++++++++++++++++
include/hw/qdev-properties.h | 5 +++++
2 files changed, 37 insertions(+)
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 50f4094..d7b0436 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -231,6 +231,38 @@ const PropertyInfo qdev_prop_bit64 = {
.set_default_value = set_default_value_bool,
};
+/* Read-only Bit64 */
+
+static void prop_set_read_only_bit64(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ return;
+}
+
+static uint64_t qdev_get_prop_read_only_mask64(Property *prop)
+{
+ assert(prop->info == &qdev_prop_read_only_bit64);
+ return 0x1ull << prop->bitnr;
+}
+
+static void prop_get_read_only_bit64(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ Property *prop = opaque;
+ uint64_t *p = object_field_prop_ptr(obj, prop);
+ bool value = (*p & qdev_get_prop_read_only_mask64(prop)) != 0;
+
+ visit_type_bool(v, name, &value, errp);
+}
+
+const PropertyInfo qdev_prop_read_only_bit64 = {
+ .name = "bool",
+ .description = "on/off",
+ .get = prop_get_read_only_bit64,
+ .set = prop_set_read_only_bit64,
+ .set_default_value = set_default_value_bool,
+};
+
/* --- bool --- */
static void get_bool(Object *obj, Visitor *v, const char *name, void *opaque,
diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
index 0ef97d6..4c4bac7 100644
--- a/include/hw/qdev-properties.h
+++ b/include/hw/qdev-properties.h
@@ -46,6 +46,7 @@ struct PropertyInfo {
extern const PropertyInfo qdev_prop_bit;
extern const PropertyInfo qdev_prop_bit64;
+extern const PropertyInfo qdev_prop_read_only_bit64;
extern const PropertyInfo qdev_prop_bool;
extern const PropertyInfo qdev_prop_enum;
extern const PropertyInfo qdev_prop_uint8;
@@ -102,6 +103,10 @@ extern const PropertyInfo qdev_prop_link;
.set_default = true, \
.defval.u = (bool)_defval)
+#define DEFINE_PROP_READ_ONLY_BIT64(_name, _state, _field, _bit) \
+ DEFINE_PROP(_name, _state, _field, qdev_prop_read_only_bit64, uint64_t, \
+ .bitnr = (_bit))
+
#define PROP_ARRAY_LEN_PREFIX "len-"
/**
--
1.8.3.1
- [PATCH v1 0/8] Virtio features acknowledged by guest, Maxim Davydov, 2021/09/01
- [PATCH v1 4/8] virtio-serial: Add tracking of the virtio guest feature bits, Maxim Davydov, 2021/09/01
- [PATCH v1 5/8] virtio-net: Add tracking of the virtio guest feature bits, Maxim Davydov, 2021/09/01
- [PATCH v1 8/8] virtio-balloon: Add tracking of the virtio guest feature bits, Maxim Davydov, 2021/09/01
- [PATCH v1 6/8] scsi: Add tracking of the acknowledged feature bits, Maxim Davydov, 2021/09/01
- [PATCH v1 7/8] virtio-blk: Add tracking of the virtio guest feature bits, Maxim Davydov, 2021/09/01
- [PATCH v1 1/8] qdev-properties: Add read-only 64 bit property,
Maxim Davydov <=
- [PATCH v1 2/8] virtio: Add tracking of the common virtio guest features, Maxim Davydov, 2021/09/01
- [PATCH v1 3/8] virtio-gpu: Add tracking of the virtio guest feature bits, Maxim Davydov, 2021/09/01
- Re: [PATCH v1 0/8] Virtio features acknowledged by guest, Stefan Hajnoczi, 2021/09/02