diff --git a/hw/i2c/pmbus_device.c b/hw/i2c/pmbus_device.c
index 481e158380..1b978e588f 100644
--- a/hw/i2c/pmbus_device.c
+++ b/hw/i2c/pmbus_device.c
@@ -1255,6 +1255,15 @@ static int pmbus_write_data(SMBusDevice *smd, uint8_t *buf, uint8_t len)
 
     if (pmdev->code == PMBUS_PAGE) {
         pmdev->page = pmbus_receive8(pmdev);
+
+        if (pmdev->page > pmdev->num_pages - 1 && pmdev->page != PB_ALL_PAGES) {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: page %u is out of range\n",
+                          __func__, pmdev->page);
+            pmdev->page = 0; /* undefined behaviour - reset to page 0 */
+            pmbus_cml_error(pmdev);
+            return PMBUS_ERR_BYTE;
+        }
         return 0;
     }
 
@@ -1268,15 +1277,6 @@ static int pmbus_write_data(SMBusDevice *smd, uint8_t *buf, uint8_t len)
         return 0;
     }
 
-    if (pmdev->page > pmdev->num_pages - 1) {
-        qemu_log_mask(LOG_GUEST_ERROR,
-                        "%s: page %u is out of range\n",
-                        __func__, pmdev->page);
-        pmdev->page = 0; /* undefined behaviour - reset to page 0 */
-        pmbus_cml_error(pmdev);
-        return PMBUS_ERR_BYTE;
-    }
-
     index = pmdev->page;
 
     switch (pmdev->code) {
diff --git a/tests/qtest/max34451-test.c b/tests/qtest/max34451-test.c
index 0c98d0764c..dbf6ddc829 100644
--- a/tests/qtest/max34451-test.c
+++ b/tests/qtest/max34451-test.c
@@ -18,6 +18,7 @@
 #define TEST_ID "max34451-test"
 #define TEST_ADDR (0x4e)
 
+#define MAX34451_MFR_MODE               0xD1
 #define MAX34451_MFR_VOUT_PEAK          0xD4
 #define MAX34451_MFR_IOUT_PEAK          0xD5
 #define MAX34451_MFR_TEMPERATURE_PEAK   0xD6
@@ -315,6 +316,28 @@ static void test_ot_faults(void *obj, void *data, QGuestAllocator *alloc)
     }
 }
 
+#define RAND_ON_OFF_CONFIG  0x12
+#define RAND_MFR_MODE       0x3456
+
+/* test writes to all pages */
+static void test_all_pages(void *obj, void *data, QGuestAllocator *alloc)
+{
+    uint16_t i2c_value;
+    QI2CDevice *i2cdev = (QI2CDevice *)obj;
+
+    i2c_set8(i2cdev, PMBUS_PAGE, PB_ALL_PAGES);
+    i2c_set8(i2cdev, PMBUS_ON_OFF_CONFIG, RAND_ON_OFF_CONFIG);
+    max34451_i2c_set16(i2cdev, MAX34451_MFR_MODE, RAND_MFR_MODE);
+
+    for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES + MAX34451_NUM_PWR_DEVICES;
+         i++) {
+        i2c_value = i2c_get8(i2cdev, PMBUS_ON_OFF_CONFIG);
+        g_assert_cmphex(i2c_value, ==, RAND_ON_OFF_CONFIG);
+        i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_MODE);
+        g_assert_cmphex(i2c_value, ==, RAND_MFR_MODE);
+    }
+}
+
 static void max34451_register_nodes(void)
 {
     QOSGraphEdgeOptions opts = {
@@ -332,5 +355,6 @@ static void max34451_register_nodes(void)
     qos_add_test("test_ro_regs", "max34451", test_ro_regs, NULL);
     qos_add_test("test_ov_faults", "max34451", test_ov_faults, NULL);
     qos_add_test("test_ot_faults", "max34451", test_ot_faults, NULL);
+    qos_add_test("test_all_pages", "max34451", test_all_pages, NULL);
 }
 libqos_init(max34451_register_nodes);