diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index aa2bbd1..bc5f948 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2670,19 +2670,19 @@
                                           "Set on/off to enable/disable "
                                           "ITS instantiation");
 
-    object_class_property_add_str(oc, "oem-id",
+    object_class_property_add_str(oc, "x-oem-id",
                                   virt_get_oem_id,
                                   virt_set_oem_id);
-    object_class_property_set_description(oc, "oem-id",
+    object_class_property_set_description(oc, "x-oem-id",
                                           "Override the default value of field OEMID "
                                           "in ACPI table header."
                                           "The string may be up to 6 bytes in size");
 
 
-    object_class_property_add_str(oc, "oem-table-id",
+    object_class_property_add_str(oc, "x-oem-table-id",
                                   virt_get_oem_table_id,
                                   virt_set_oem_table_id);
-    object_class_property_set_description(oc, "oem-table-id",
+    object_class_property_set_description(oc, "x-oem-table-id",
                                           "Override the default value of field OEM Table ID "
                                           "in ACPI table header."
                                           "The string may be up to 8 bytes in size");
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 9935c6d..a50f2d5 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -53,6 +53,7 @@
     { "nvme", "use-intel-id", "on"},
     { "pvpanic", "events", "1"}, /* PVPANIC_PANICKED */
     { "pl011", "migrate-clk", "off" },
+    { "virtio-pci", "x-ats-page-aligned", "off"},
 };
 const size_t hw_compat_5_1_len = G_N_ELEMENTS(hw_compat_5_1);
 
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index a733e2f..fd0fa15 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -963,16 +963,18 @@
     pci_set_quad(dev->config + offset + pci_dsn_cap, ser_num);
 }
 
-void pcie_ats_init(PCIDevice *dev, uint16_t offset)
+void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned)
 {
     pcie_add_capability(dev, PCI_EXT_CAP_ID_ATS, 0x1,
                         offset, PCI_EXT_CAP_ATS_SIZEOF);
 
     dev->exp.ats_cap = offset;
 
-    /* Invalidate Queue Depth 0, Page Aligned Request 1 */
-    pci_set_word(dev->config + offset + PCI_ATS_CAP,
-                 PCI_ATS_CAP_PAGE_ALIGNED);
+    /* Invalidate Queue Depth 0 */
+    if (aligned) {
+        pci_set_word(dev->config + offset + PCI_ATS_CAP,
+                     PCI_ATS_CAP_PAGE_ALIGNED);
+    }
     /* STU 0, Disabled by default */
     pci_set_word(dev->config + offset + PCI_ATS_CTRL, 0);
 
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index c1b67cf..b321604 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1856,7 +1856,8 @@
         }
 
         if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
-            pcie_ats_init(pci_dev, last_pcie_cap_offset);
+            pcie_ats_init(pci_dev, last_pcie_cap_offset,
+                          proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
             last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
         }
 
@@ -1933,6 +1934,8 @@
                      ignore_backend_features, false),
     DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
                     VIRTIO_PCI_FLAG_ATS_BIT, false),
+    DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
+                    VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
     DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
                     VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
     DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index d7d5d40..2446dcd 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -42,6 +42,7 @@
     VIRTIO_PCI_FLAG_INIT_PM_BIT,
     VIRTIO_PCI_FLAG_INIT_FLR_BIT,
     VIRTIO_PCI_FLAG_AER_BIT,
+    VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT,
 };
 
 /* Need to activate work-arounds for buggy guests at vmstate load. */
@@ -84,6 +85,10 @@
 /* Advanced Error Reporting capability */
 #define VIRTIO_PCI_FLAG_AER (1 << VIRTIO_PCI_FLAG_AER_BIT)
 
+/* Page Aligned Address space Translation Service */
+#define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \
+  (1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT)
+
 typedef struct {
     MSIMessage msg;
     int virq;
diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index 26c9cc4..c09b648 100644
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -78,8 +78,8 @@
 
 #define X86_MACHINE_SMM              "smm"
 #define X86_MACHINE_ACPI             "acpi"
-#define X86_MACHINE_OEM_ID           "oem-id"
-#define X86_MACHINE_OEM_TABLE_ID     "oem-table-id"
+#define X86_MACHINE_OEM_ID           "x-oem-id"
+#define X86_MACHINE_OEM_TABLE_ID     "x-oem-table-id"
 
 #define TYPE_X86_MACHINE   MACHINE_TYPE_NAME("x86")
 OBJECT_DECLARE_TYPE(X86MachineState, X86MachineClass, X86_MACHINE)
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 14c58eb..6063bee 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -137,7 +137,7 @@
 
 void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn);
 void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num);
-void pcie_ats_init(PCIDevice *dev, uint16_t offset);
+void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned);
 
 void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
                                Error **errp);
diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
index e020c83..156d417 100644
--- a/tests/qtest/bios-tables-test.c
+++ b/tests/qtest/bios-tables-test.c
@@ -73,7 +73,7 @@
 
 #define OEM_ID             "TEST"
 #define OEM_TABLE_ID       "OEM"
-#define OEM_TEST_ARGS      "-machine oem-id="OEM_ID",oem-table-id="OEM_TABLE_ID
+#define OEM_TEST_ARGS      "-machine x-oem-id="OEM_ID",x-oem-table-id="OEM_TABLE_ID
 
 typedef struct {
     bool tcg_only;