diff --git a/block/export/vduse-blk.c b/block/export/vduse-blk.c
index 172f73cef4..bd852e538d 100644
--- a/block/export/vduse-blk.c
+++ b/block/export/vduse-blk.c
@@ -273,7 +273,6 @@ static int vduse_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
     uint64_t logical_block_size = VIRTIO_BLK_SECTOR_SIZE;
     uint16_t num_queues = VDUSE_DEFAULT_NUM_QUEUE;
     uint16_t queue_size = VDUSE_DEFAULT_QUEUE_SIZE;
-    Error *local_err = NULL;
     struct virtio_blk_config config = { 0 };
     uint64_t features;
     int i, ret;
@@ -297,10 +296,8 @@ static int vduse_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
 
     if (vblk_opts->has_logical_block_size) {
         logical_block_size = vblk_opts->logical_block_size;
-        check_block_size(exp->id, "logical-block-size", logical_block_size,
-                         &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
+        if (!check_block_size("logical-block-size", logical_block_size,
+                              errp)) {
             return -EINVAL;
         }
     }
diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user-blk-server.c
index 50c358e8cd..d9d2014d9b 100644
--- a/block/export/vhost-user-blk-server.c
+++ b/block/export/vhost-user-blk-server.c
@@ -319,7 +319,6 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
 {
     VuBlkExport *vexp = container_of(exp, VuBlkExport, export);
     BlockExportOptionsVhostUserBlk *vu_opts = &opts->u.vhost_user_blk;
-    Error *local_err = NULL;
     uint64_t logical_block_size;
     uint16_t num_queues = VHOST_USER_BLK_NUM_QUEUES_DEFAULT;
 
@@ -330,10 +329,7 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
     } else {
         logical_block_size = VIRTIO_BLK_SECTOR_SIZE;
     }
-    check_block_size(exp->id, "logical-block-size", logical_block_size,
-                     &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!check_block_size("logical-block-size", logical_block_size, errp)) {
         return -EINVAL;
     }
 
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 60bcd821de..35deef05f3 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -588,18 +588,14 @@ const PropertyInfo qdev_prop_losttickpolicy = {
 static void set_blocksize(Object *obj, Visitor *v, const char *name,
                           void *opaque, Error **errp)
 {
-    DeviceState *dev = DEVICE(obj);
     Property *prop = opaque;
     uint32_t *ptr = object_field_prop_ptr(obj, prop);
     uint64_t value;
-    Error *local_err = NULL;
 
     if (!visit_type_size(v, name, &value, errp)) {
         return;
     }
-    check_block_size(dev->id ? : "", name, value, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!check_block_size(name, value, errp)) {
         return;
     }
     *ptr = value;
diff --git a/hw/intc/openpic.c b/hw/intc/openpic.c
index 32bd880dfa..cd3d87768e 100644
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@ -41,7 +41,6 @@
 #include "hw/pci/msi.h"
 #include "qapi/error.h"
 #include "qemu/bitops.h"
-#include "qapi/qmp/qerror.h"
 #include "qemu/module.h"
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
@@ -1535,9 +1534,7 @@ static void openpic_realize(DeviceState *dev, Error **errp)
     };
 
     if (opp->nb_cpus > MAX_CPU) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE,
-                   TYPE_OPENPIC, "nb_cpus", (uint64_t)opp->nb_cpus,
-                   (uint64_t)0, (uint64_t)MAX_CPU);
+        error_setg(errp, "property 'nb_cpus' can be at most %d", MAX_CPU);
         return;
     }
 
diff --git a/include/qapi/qmp/qerror.h b/include/qapi/qmp/qerror.h
index 38e89762b3..d1db6f18cd 100644
--- a/include/qapi/qmp/qerror.h
+++ b/include/qapi/qmp/qerror.h
@@ -23,10 +23,4 @@
 #define QERR_MISSING_PARAMETER \
     "Parameter '%s' is missing"
 
-#define QERR_PROPERTY_VALUE_OUT_OF_RANGE \
-    "Property %s.%s doesn't take value %" PRId64 " (minimum: %" PRId64 ", maximum: %" PRId64 ")"
-
-#define QERR_UNSUPPORTED \
-    "this feature or command is not currently supported"
-
 #endif /* QERROR_H */
diff --git a/qga/commands-bsd.c b/qga/commands-bsd.c
index 9ce48af311..94ff6fee6a 100644
--- a/qga/commands-bsd.c
+++ b/qga/commands-bsd.c
@@ -12,7 +12,6 @@
 
 #include "qemu/osdep.h"
 #include "qga-qapi-commands.h"
-#include "qapi/qmp/qerror.h"
 #include "qapi/error.h"
 #include "qemu/queue.h"
 #include "commands-common.h"
diff --git a/qga/commands-linux.c b/qga/commands-linux.c
index 51d5e3d927..9b1746b24f 100644
--- a/qga/commands-linux.c
+++ b/qga/commands-linux.c
@@ -15,7 +15,6 @@
 #include "qapi/error.h"
 #include "qga-qapi-commands.h"
 #include "qapi/error.h"
-#include "qapi/qmp/qerror.h"
 #include "commands-common.h"
 #include "cutils.h"
 #include <mntent.h>
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index c2bd0b4316..389c5eeb5d 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -18,7 +18,6 @@
 #include <dirent.h>
 #include "qga-qapi-commands.h"
 #include "qapi/error.h"
-#include "qapi/qmp/qerror.h"
 #include "qemu/host-utils.h"
 #include "qemu/sockets.h"
 #include "qemu/base64.h"
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 61b36da469..038beb8cfa 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -1914,7 +1914,7 @@ void qmp_guest_set_user_password(const char *username,
     GError *gerr = NULL;
 
     if (crypted) {
-        error_setg(errp, QERR_UNSUPPORTED);
+        error_setg(errp, "'crypted' must be off on this host");
         return;
     }
 
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 495706cf73..0537bb7886 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1,15 +1,6 @@
 # *-*- Mode: Python -*-*
 # vim: filetype=python
 
-##
-# = General note concerning the use of guest agent interfaces
-#
-# "unsupported" is a higher-level error than the errors that
-# individual commands might document.  The caller should always be
-# prepared to receive QERR_UNSUPPORTED, even if the given command
-# doesn't specify it, or doesn't document any failure mode at all.
-##
-
 ##
 # = QEMU guest agent protocol commands and structs
 ##
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 565aad02ea..1ff1af032e 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -31,7 +31,6 @@
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qapi/qapi-visit-machine.h"
-#include "qapi/qmp/qerror.h"
 #include "standard-headers/asm-x86/kvm_para.h"
 #include "hw/qdev-properties.h"
 #include "hw/i386/topology.h"
@@ -5440,13 +5439,13 @@ static void x86_cpuid_version_get_family(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    int64_t value;
+    uint64_t value;
 
     value = (env->cpuid_version >> 8) & 0xf;
     if (value == 0xf) {
         value += (env->cpuid_version >> 20) & 0xff;
     }
-    visit_type_int(v, name, &value, errp);
+    visit_type_uint64(v, name, &value, errp);
 }
 
 static void x86_cpuid_version_set_family(Object *obj, Visitor *v,
@@ -5455,16 +5454,15 @@ static void x86_cpuid_version_set_family(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    const int64_t min = 0;
-    const int64_t max = 0xff + 0xf;
-    int64_t value;
+    const uint64_t max = 0xff + 0xf;
+    uint64_t value;
 
-    if (!visit_type_int(v, name, &value, errp)) {
+    if (!visit_type_uint64(v, name, &value, errp)) {
         return;
     }
-    if (value < min || value > max) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "",
-                   name ? name : "null", value, min, max);
+    if (value > max) {
+        error_setg(errp, "parameter '%s' can be at most %" PRIu64,
+                   name ? name : "null", max);
         return;
     }
 
@@ -5482,11 +5480,11 @@ static void x86_cpuid_version_get_model(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    int64_t value;
+    uint64_t value;
 
     value = (env->cpuid_version >> 4) & 0xf;
     value |= ((env->cpuid_version >> 16) & 0xf) << 4;
-    visit_type_int(v, name, &value, errp);
+    visit_type_uint64(v, name, &value, errp);
 }
 
 static void x86_cpuid_version_set_model(Object *obj, Visitor *v,
@@ -5495,16 +5493,15 @@ static void x86_cpuid_version_set_model(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    const int64_t min = 0;
-    const int64_t max = 0xff;
-    int64_t value;
+    const uint64_t max = 0xff;
+    uint64_t value;
 
-    if (!visit_type_int(v, name, &value, errp)) {
+    if (!visit_type_uint64(v, name, &value, errp)) {
         return;
     }
-    if (value < min || value > max) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "",
-                   name ? name : "null", value, min, max);
+    if (value > max) {
+        error_setg(errp, "parameter '%s' can be at most %" PRIu64,
+                   name ? name : "null", max);
         return;
     }
 
@@ -5518,10 +5515,10 @@ static void x86_cpuid_version_get_stepping(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    int64_t value;
+    uint64_t value;
 
     value = env->cpuid_version & 0xf;
-    visit_type_int(v, name, &value, errp);
+    visit_type_uint64(v, name, &value, errp);
 }
 
 static void x86_cpuid_version_set_stepping(Object *obj, Visitor *v,
@@ -5530,16 +5527,15 @@ static void x86_cpuid_version_set_stepping(Object *obj, Visitor *v,
 {
     X86CPU *cpu = X86_CPU(obj);
     CPUX86State *env = &cpu->env;
-    const int64_t min = 0;
-    const int64_t max = 0xf;
-    int64_t value;
+    const uint64_t max = 0xf;
+    uint64_t value;
 
-    if (!visit_type_int(v, name, &value, errp)) {
+    if (!visit_type_uint64(v, name, &value, errp)) {
         return;
     }
-    if (value < min || value > max) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "",
-                   name ? name : "null", value, min, max);
+    if (value > max) {
+        error_setg(errp, "parameter '%s' can be at most %" PRIu64,
+                   name ? name : "null", max);
         return;
     }
 
@@ -5633,16 +5629,15 @@ static void x86_cpuid_set_tsc_freq(Object *obj, Visitor *v, const char *name,
                                    void *opaque, Error **errp)
 {
     X86CPU *cpu = X86_CPU(obj);
-    const int64_t min = 0;
     const int64_t max = INT64_MAX;
     int64_t value;
 
     if (!visit_type_int(v, name, &value, errp)) {
         return;
     }
-    if (value < min || value > max) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "",
-                   name ? name : "null", value, min, max);
+    if (value < 0 || value > max) {
+        error_setg(errp, "parameter '%s' can be at most %" PRId64,
+                   name ? name : "null", max);
         return;
     }
 
diff --git a/util/block-helpers.c b/util/block-helpers.c
index c4851432f5..052b4e1476 100644
--- a/util/block-helpers.c
+++ b/util/block-helpers.c
@@ -10,12 +10,10 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
-#include "qapi/qmp/qerror.h"
 #include "block-helpers.h"
 
 /**
  * check_block_size:
- * @id: The unique ID of the object
  * @name: The name of the property being validated
  * @value: The block size in bytes
  * @errp: A pointer to an area to store an error
@@ -24,23 +22,23 @@
  * 1. At least MIN_BLOCK_SIZE
  * 2. No larger than MAX_BLOCK_SIZE
  * 3. A power of 2
+ *
+ * Returns: true on success, false on failure
  */
-void check_block_size(const char *id, const char *name, int64_t value,
-                      Error **errp)
+bool check_block_size(const char *name, int64_t value, Error **errp)
 {
-    /* value of 0 means "unset" */
-    if (value && (value < MIN_BLOCK_SIZE || value > MAX_BLOCK_SIZE)) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE,
-                   id, name, value, MIN_BLOCK_SIZE, MAX_BLOCK_SIZE);
-        return;
+    if (!value) {
+        /* unset */
+        return true;
     }
 
-    /* We rely on power-of-2 blocksizes for bitmasks */
-    if ((value & (value - 1)) != 0) {
+    if (value < MIN_BLOCK_SIZE || value > MAX_BLOCK_SIZE
+        || (value & (value - 1))) {
         error_setg(errp,
-                   "Property %s.%s doesn't take value '%" PRId64
-                   "', it's not a power of 2",
-                   id, name, value);
-        return;
+                   "parameter %s must be a power of 2 between %" PRId64
+                   " and %" PRId64,
+                   name, MIN_BLOCK_SIZE, MAX_BLOCK_SIZE);
+        return false;
     }
+    return true;
 }
diff --git a/util/block-helpers.h b/util/block-helpers.h
index b53295a529..838b0825f6 100644
--- a/util/block-helpers.h
+++ b/util/block-helpers.h
@@ -13,7 +13,6 @@
 #define MAX_BLOCK_SIZE          (2 * MiB)
 #define MAX_BLOCK_SIZE_STR      "2 MiB"
 
-void check_block_size(const char *id, const char *name, int64_t value,
-                      Error **errp);
+bool check_block_size(const char *name, int64_t value, Error **errp);
 
 #endif /* BLOCK_HELPERS_H */