diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 02d8546bd3..c15e5b8281 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -35,6 +35,7 @@
 #include "sysemu/runstate.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/ich9_tco.h"
+#include "hw/acpi/ich9_timer.h"
 
 #include "hw/southbridge/ich9.h"
 #include "hw/mem/pc-dimm.h"
@@ -108,6 +109,18 @@ static void ich9_smi_writel(void *opaque, hwaddr addr, uint64_t val,
         }
         pm->smi_en &= ~pm->smi_en_wmask;
         pm->smi_en |= (val & pm->smi_en_wmask);
+        if (pm->swsmi_timer_enabled) {
+            ich9_pm_update_swsmi_timer(pm, pm->smi_en &
+                                               ICH9_PMIO_SMI_EN_SWSMI_EN);
+        }
+        if (pm->periodic_timer_enabled) {
+            ich9_pm_update_periodic_timer(pm, pm->smi_en &
+                                                  ICH9_PMIO_SMI_EN_PERIODIC_EN);
+        }
+        break;
+    case 4:
+        pm->smi_sts &= ~pm->smi_sts_wmask;
+        pm->smi_sts |= (val & pm->smi_sts_wmask);
         break;
     }
 }
@@ -286,6 +299,8 @@ static void pm_powerdown_req(Notifier *n, void *opaque)
 
 void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, qemu_irq sci_irq)
 {
+    pm->smi_sts_wmask = 0;
+
     memory_region_init(&pm->io, OBJECT(lpc_pci), "ich9-pm", ICH9_PMIO_SIZE);
     memory_region_set_enabled(&pm->io, false);
     memory_region_add_subregion(pci_address_space_io(lpc_pci),
@@ -305,6 +320,14 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, qemu_irq sci_irq)
                           "acpi-smi", 8);
     memory_region_add_subregion(&pm->io, ICH9_PMIO_SMI_EN, &pm->io_smi);
 
+    if (pm->swsmi_timer_enabled) {
+        ich9_pm_swsmi_timer_init(pm);
+    }
+
+    if (pm->periodic_timer_enabled) {
+        ich9_pm_periodic_timer_init(pm);
+    }
+
     if (pm->enable_tco) {
         acpi_pm_tco_init(&pm->tco_regs, &pm->io);
     }
diff --git a/hw/acpi/ich9_timer.c b/hw/acpi/ich9_timer.c
new file mode 100644
index 0000000000..5b1c910156
--- /dev/null
+++ b/hw/acpi/ich9_timer.c
@@ -0,0 +1,93 @@
+/*
+ * QEMU ICH9 Timer emulation
+ *
+ * Copyright (c) 2024 Dominic Prinz <git@dprinz.de>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/core/cpu.h"
+#include "hw/pci/pci.h"
+#include "hw/southbridge/ich9.h"
+#include "qemu/timer.h"
+
+#include "hw/acpi/ich9_timer.h"
+
+void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable)
+{
+    uint16_t swsmi_rate_sel;
+    int64_t expire_time;
+    ICH9LPCState *lpc;
+
+    if (enable) {
+        lpc = container_of(pm, ICH9LPCState, pm);
+        swsmi_rate_sel =
+            (pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_3) & 0xc0) >> 6;
+
+        if (swsmi_rate_sel == 0) {
+            expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1500000LL;
+        } else {
+            expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+                          8 * (1 << swsmi_rate_sel) * 1000000LL;
+        }
+
+        timer_mod(pm->swsmi_timer, expire_time);
+    } else {
+        timer_del(pm->swsmi_timer);
+    }
+}
+
+static void ich9_pm_swsmi_timer_expired(void *opaque)
+{
+    ICH9LPCPMRegs *pm = opaque;
+
+    pm->smi_sts |= ICH9_PMIO_SMI_STS_SWSMI_STS;
+    ich9_generate_smi();
+
+    ich9_pm_update_swsmi_timer(pm, pm->smi_en & ICH9_PMIO_SMI_EN_SWSMI_EN);
+}
+
+void ich9_pm_swsmi_timer_init(ICH9LPCPMRegs *pm)
+{
+    pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_SWSMI_STS;
+    pm->swsmi_timer =
+        timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_swsmi_timer_expired, pm);
+}
+
+void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable)
+{
+    uint16_t per_smi_sel;
+    int64_t expire_time;
+    ICH9LPCState *lpc;
+
+    if (enable) {
+        lpc = container_of(pm, ICH9LPCState, pm);
+        per_smi_sel = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1) & 3;
+        expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+                      8 * (1 << (3 - per_smi_sel)) * NANOSECONDS_PER_SECOND;
+
+        timer_mod(pm->periodic_timer, expire_time);
+    } else {
+        timer_del(pm->periodic_timer);
+    }
+}
+
+static void ich9_pm_periodic_timer_expired(void *opaque)
+{
+    ICH9LPCPMRegs *pm = opaque;
+
+    pm->smi_sts = ICH9_PMIO_SMI_STS_PERIODIC_STS;
+    ich9_generate_smi();
+
+    ich9_pm_update_periodic_timer(pm,
+                                  pm->smi_en & ICH9_PMIO_SMI_EN_PERIODIC_EN);
+}
+
+void ich9_pm_periodic_timer_init(ICH9LPCPMRegs *pm)
+{
+    pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_PERIODIC_STS;
+    pm->periodic_timer =
+        timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_periodic_timer_expired, pm);
+}
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index fa5c07db90..7f8ccc9b7a 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -24,7 +24,7 @@ acpi_ss.add(when: 'CONFIG_ACPI_PCI_BRIDGE', if_true: files('pci-bridge.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_true: files('pcihp.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_false: files('acpi-pci-hotplug-stub.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_VIOT', if_true: files('viot.c'))
-acpi_ss.add(when: 'CONFIG_ACPI_ICH9', if_true: files('ich9.c', 'ich9_tco.c'))
+acpi_ss.add(when: 'CONFIG_ACPI_ICH9', if_true: files('ich9.c', 'ich9_tco.c', 'ich9_timer.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_ERST', if_true: files('erst.c'))
 acpi_ss.add(when: 'CONFIG_IPMI', if_true: files('ipmi.c'), if_false: files('ipmi-stub.c'))
 acpi_ss.add(when: 'CONFIG_PC', if_false: files('acpi-x86-stub.c'))
diff --git a/hw/audio/trace-events b/hw/audio/trace-events
index b1870ff224..b8ef572767 100644
--- a/hw/audio/trace-events
+++ b/hw/audio/trace-events
@@ -41,7 +41,6 @@ asc_update_irq(int irq, int a, int b) "set IRQ to %d (A: 0x%x B: 0x%x)"
 
 #virtio-snd.c
 virtio_snd_get_config(void *vdev, uint32_t jacks, uint32_t streams, uint32_t chmaps) "snd %p: get_config jacks=%"PRIu32" streams=%"PRIu32" chmaps=%"PRIu32""
-virtio_snd_set_config(void *vdev, uint32_t jacks, uint32_t new_jacks, uint32_t streams, uint32_t new_streams, uint32_t chmaps, uint32_t new_chmaps) "snd %p: set_config jacks from %"PRIu32"->%"PRIu32", streams from %"PRIu32"->%"PRIu32", chmaps from %"PRIu32"->%"PRIu32
 virtio_snd_get_features(void *vdev, uint64_t features) "snd %p: get_features 0x%"PRIx64
 virtio_snd_vm_state_running(void) "vm state running"
 virtio_snd_vm_state_stopped(void) "vm state stopped"
diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index d1cf5eb445..69838181dd 100644
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -107,29 +107,6 @@ virtio_snd_get_config(VirtIODevice *vdev, uint8_t *config)
 
 }
 
-static void
-virtio_snd_set_config(VirtIODevice *vdev, const uint8_t *config)
-{
-    VirtIOSound *s = VIRTIO_SND(vdev);
-    const virtio_snd_config *sndconfig =
-        (const virtio_snd_config *)config;
-
-
-   trace_virtio_snd_set_config(vdev,
-                               s->snd_conf.jacks,
-                               sndconfig->jacks,
-                               s->snd_conf.streams,
-                               sndconfig->streams,
-                               s->snd_conf.chmaps,
-                               sndconfig->chmaps);
-
-    memcpy(&s->snd_conf, sndconfig, sizeof(virtio_snd_config));
-    le32_to_cpus(&s->snd_conf.jacks);
-    le32_to_cpus(&s->snd_conf.streams);
-    le32_to_cpus(&s->snd_conf.chmaps);
-
-}
-
 static void
 virtio_snd_pcm_buffer_free(VirtIOSoundPCMBuffer *buffer)
 {
@@ -1400,7 +1377,6 @@ static void virtio_snd_class_init(ObjectClass *klass, void *data)
     vdc->realize = virtio_snd_realize;
     vdc->unrealize = virtio_snd_unrealize;
     vdc->get_config = virtio_snd_get_config;
-    vdc->set_config = virtio_snd_set_config;
     vdc->get_features = get_features;
     vdc->reset = virtio_snd_reset;
     vdc->legacy_features = 0;
diff --git a/hw/core/irq.c b/hw/core/irq.c
index 3f14e2dda7..db95ffc18f 100644
--- a/hw/core/irq.c
+++ b/hw/core/irq.c
@@ -26,16 +26,6 @@
 #include "hw/irq.h"
 #include "qom/object.h"
 
-OBJECT_DECLARE_SIMPLE_TYPE(IRQState, IRQ)
-
-struct IRQState {
-    Object parent_obj;
-
-    qemu_irq_handler handler;
-    void *opaque;
-    int n;
-};
-
 void qemu_set_irq(qemu_irq irq, int level)
 {
     if (!irq)
@@ -44,6 +34,15 @@ void qemu_set_irq(qemu_irq irq, int level)
     irq->handler(irq->opaque, irq->n, level);
 }
 
+void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
+                   int n)
+{
+    object_initialize(irq, sizeof(*irq), TYPE_IRQ);
+    irq->handler = handler;
+    irq->opaque = opaque;
+    irq->n = n;
+}
+
 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
                            void *opaque, int n)
 {
@@ -69,10 +68,8 @@ qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
 {
     IRQState *irq;
 
-    irq = IRQ(object_new(TYPE_IRQ));
-    irq->handler = handler;
-    irq->opaque = opaque;
-    irq->n = n;
+    irq = g_new(IRQState, 1);
+    qemu_init_irq(irq, handler, opaque, n);
 
     return irq;
 }
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 3ebbd32e10..9258e48f95 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -2076,7 +2076,7 @@ static CXLRetCode cmd_media_get_scan_media_results(const struct cxl_cmd *cmd,
 
         start = ROUND_DOWN(ent->start, 64ull);
         stop = ROUND_DOWN(ent->start, 64ull) + ent->length;
-        stq_le_p(&out->records[i].addr, start | (ent->type & 0x7));
+        stq_le_p(&out->records[i].addr, start);
         stl_le_p(&out->records[i].length, (stop - start) / CXL_CACHE_LINE_SIZE);
         i++;
 
diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index c0c66910f1..14548f1a57 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -642,7 +642,7 @@ vhost_user_gpu_device_realize(DeviceState *qdev, Error **errp)
 static struct vhost_dev *vhost_user_gpu_get_vhost(VirtIODevice *vdev)
 {
     VhostUserGPU *g = VHOST_USER_GPU(vdev);
-    return &g->vhost->dev;
+    return g->vhost ? &g->vhost->dev : NULL;
 }
 
 static Property vhost_user_gpu_properties[] = {
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 5d4bd2b710..4967aa7459 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -724,120 +724,44 @@ static Aml *aml_pci_pdsm(void)
     return method;
 }
 
-/**
- * build_prt_entry:
- * @link_name: link name for PCI route entry
- *
- * build AML package containing a PCI route entry for @link_name
- */
-static Aml *build_prt_entry(const char *link_name)
-{
-    Aml *a_zero = aml_int(0);
-    Aml *pkg = aml_package(4);
-    aml_append(pkg, a_zero);
-    aml_append(pkg, a_zero);
-    aml_append(pkg, aml_name("%s", link_name));
-    aml_append(pkg, a_zero);
-    return pkg;
-}
-
 /*
- * initialize_route - Initialize the interrupt routing rule
- * through a specific LINK:
- *  if (lnk_idx == idx)
- *      route using link 'link_name'
- */
-static Aml *initialize_route(Aml *route, const char *link_name,
-                             Aml *lnk_idx, int idx)
-{
-    Aml *if_ctx = aml_if(aml_equal(lnk_idx, aml_int(idx)));
-    Aml *pkg = build_prt_entry(link_name);
-
-    aml_append(if_ctx, aml_store(pkg, route));
-
-    return if_ctx;
-}
-
-/*
- * build_prt - Define interrupt rounting rules
+ * build_prt - Define interrupt routing rules
  *
  * Returns an array of 128 routes, one for each device,
  * based on device location.
  * The main goal is to equally distribute the interrupts
  * over the 4 existing ACPI links (works only for i440fx).
- * The hash function is  (slot + pin) & 3 -> "LNK[D|A|B|C]".
+ * The hash function is: (slot + pin) & 3 -> "LNK[D|A|B|C]".
  *
  */
 static Aml *build_prt(bool is_pci0_prt)
 {
-    Aml *method, *while_ctx, *pin, *res;
+    const int nroutes = 128;
+    Aml *rt_pkg, *method;
+    int pin;
 
     method = aml_method("_PRT", 0, AML_NOTSERIALIZED);
-    res = aml_local(0);
-    pin = aml_local(1);
-    aml_append(method, aml_store(aml_package(128), res));
-    aml_append(method, aml_store(aml_int(0), pin));
+    rt_pkg = aml_varpackage(nroutes);
 
-    /* while (pin < 128) */
-    while_ctx = aml_while(aml_lless(pin, aml_int(128)));
-    {
-        Aml *slot = aml_local(2);
-        Aml *lnk_idx = aml_local(3);
-        Aml *route = aml_local(4);
+    for (pin = 0; pin < nroutes; pin++) {
+        Aml *pkg = aml_package(4);
+        int slot = pin >> 2;
 
-        /* slot = pin >> 2 */
-        aml_append(while_ctx,
-                   aml_store(aml_shiftright(pin, aml_int(2), NULL), slot));
-        /* lnk_idx = (slot + pin) & 3 */
-        aml_append(while_ctx,
-            aml_store(aml_and(aml_add(pin, slot, NULL), aml_int(3), NULL),
-                      lnk_idx));
-
-        /* route[2] = "LNK[D|A|B|C]", selection based on pin % 3  */
-        aml_append(while_ctx, initialize_route(route, "LNKD", lnk_idx, 0));
-        if (is_pci0_prt) {
-            Aml *if_device_1, *if_pin_4, *else_pin_4;
-
-            /* device 1 is the power-management device, needs SCI */
-            if_device_1 = aml_if(aml_equal(lnk_idx, aml_int(1)));
-            {
-                if_pin_4 = aml_if(aml_equal(pin, aml_int(4)));
-                {
-                    aml_append(if_pin_4,
-                        aml_store(build_prt_entry("LNKS"), route));
-                }
-                aml_append(if_device_1, if_pin_4);
-                else_pin_4 = aml_else();
-                {
-                    aml_append(else_pin_4,
-                        aml_store(build_prt_entry("LNKA"), route));
-                }
-                aml_append(if_device_1, else_pin_4);
-            }
-            aml_append(while_ctx, if_device_1);
+        aml_append(pkg, aml_int((slot << 16) | 0xFFFF));
+        aml_append(pkg, aml_int(pin & 3));
+        /* device 1 is the power-management device, needs SCI */
+        if (is_pci0_prt && pin == 4) {
+            aml_append(pkg, aml_name("%s", "LNKS"));
         } else {
-            aml_append(while_ctx, initialize_route(route, "LNKA", lnk_idx, 1));
+            static const char link_name[][5] = {"LNKD", "LNKA", "LNKB", "LNKC"};
+            int hash = (slot + pin) & 3;
+            aml_append(pkg, aml_name("%s", link_name[hash]));
         }
-        aml_append(while_ctx, initialize_route(route, "LNKB", lnk_idx, 2));
-        aml_append(while_ctx, initialize_route(route, "LNKC", lnk_idx, 3));
-
-        /* route[0] = 0x[slot]FFFF */
-        aml_append(while_ctx,
-            aml_store(aml_or(aml_shiftleft(slot, aml_int(16)), aml_int(0xFFFF),
-                             NULL),
-                      aml_index(route, aml_int(0))));
-        /* route[1] = pin & 3 */
-        aml_append(while_ctx,
-            aml_store(aml_and(pin, aml_int(3), NULL),
-                      aml_index(route, aml_int(1))));
-        /* res[pin] = route */
-        aml_append(while_ctx, aml_store(route, aml_index(res, pin)));
-        /* pin++ */
-        aml_append(while_ctx, aml_increment(pin));
+        aml_append(pkg, aml_int(0));
+        aml_append(rt_pkg, pkg);
     }
-    aml_append(method, while_ctx);
-    /* return res*/
-    aml_append(method, aml_return(res));
+
+    aml_append(method, aml_return(rt_pkg));
 
     return method;
 }
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 16d2885fcc..90cd4e5044 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2744,7 +2744,7 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         return false;
     }
 
-    desc_type = inv_desc.lo & VTD_INV_DESC_TYPE;
+    desc_type = VTD_INV_DESC_TYPE(inv_desc.lo);
     /* FIXME: should update at first or at last? */
     s->iq_last_desc_type = desc_type;
 
@@ -2763,17 +2763,6 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         }
         break;
 
-    /*
-     * TODO: the entity of below two cases will be implemented in future series.
-     * To make guest (which integrates scalable mode support patch set in
-     * iommu driver) work, just return true is enough so far.
-     */
-    case VTD_INV_DESC_PC:
-        break;
-
-    case VTD_INV_DESC_PIOTLB:
-        break;
-
     case VTD_INV_DESC_WAIT:
         trace_vtd_inv_desc("wait", inv_desc.hi, inv_desc.lo);
         if (!vtd_process_wait_desc(s, &inv_desc)) {
@@ -2795,6 +2784,17 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         }
         break;
 
+    /*
+     * TODO: the entity of below two cases will be implemented in future series.
+     * To make guest (which integrates scalable mode support patch set in
+     * iommu driver) work, just return true is enough so far.
+     */
+    case VTD_INV_DESC_PC:
+    case VTD_INV_DESC_PIOTLB:
+        if (s->scalable_mode) {
+            break;
+        }
+    /* fallthrough */
     default:
         error_report_once("%s: invalid inv desc: hi=%"PRIx64", lo=%"PRIx64
                           " (unknown type)", __func__, inv_desc.hi,
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 5f32c36943..13d5d129ae 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -356,7 +356,8 @@ union VTDInvDesc {
 typedef union VTDInvDesc VTDInvDesc;
 
 /* Masks for struct VTDInvDesc */
-#define VTD_INV_DESC_TYPE               0xf
+#define VTD_INV_DESC_TYPE(val)          ((((val) >> 5) & 0x70ULL) | \
+                                         ((val) & 0xfULL))
 #define VTD_INV_DESC_CC                 0x1 /* Context-cache Invalidate Desc */
 #define VTD_INV_DESC_IOTLB              0x2
 #define VTD_INV_DESC_DEVICE             0x3
@@ -372,7 +373,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_WAIT_IF            (1ULL << 4)
 #define VTD_INV_DESC_WAIT_FN            (1ULL << 6)
 #define VTD_INV_DESC_WAIT_DATA_SHIFT    32
-#define VTD_INV_DESC_WAIT_RSVD_LO       0Xffffff80ULL
+#define VTD_INV_DESC_WAIT_RSVD_LO       0Xfffff180ULL
 #define VTD_INV_DESC_WAIT_RSVD_HI       3ULL
 
 /* Masks for Context-cache Invalidation Descriptor */
@@ -383,7 +384,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_CC_DID(val)        (((val) >> 16) & VTD_DOMAIN_ID_MASK)
 #define VTD_INV_DESC_CC_SID(val)        (((val) >> 32) & 0xffffUL)
 #define VTD_INV_DESC_CC_FM(val)         (((val) >> 48) & 3UL)
-#define VTD_INV_DESC_CC_RSVD            0xfffc00000000ffc0ULL
+#define VTD_INV_DESC_CC_RSVD            0xfffc00000000f1c0ULL
 
 /* Masks for IOTLB Invalidate Descriptor */
 #define VTD_INV_DESC_IOTLB_G            (3ULL << 4)
@@ -393,7 +394,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_IOTLB_DID(val)     (((val) >> 16) & VTD_DOMAIN_ID_MASK)
 #define VTD_INV_DESC_IOTLB_ADDR(val)    ((val) & ~0xfffULL)
 #define VTD_INV_DESC_IOTLB_AM(val)      ((val) & 0x3fULL)
-#define VTD_INV_DESC_IOTLB_RSVD_LO      0xffffffff0000ff00ULL
+#define VTD_INV_DESC_IOTLB_RSVD_LO      0xffffffff0000f100ULL
 #define VTD_INV_DESC_IOTLB_RSVD_HI      0xf80ULL
 #define VTD_INV_DESC_IOTLB_PASID_PASID  (2ULL << 4)
 #define VTD_INV_DESC_IOTLB_PASID_PAGE   (3ULL << 4)
@@ -406,7 +407,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_DEVICE_IOTLB_SIZE(val) ((val) & 0x1)
 #define VTD_INV_DESC_DEVICE_IOTLB_SID(val) (((val) >> 32) & 0xFFFFULL)
 #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
-#define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
+#define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0f1f0
 
 /* Rsvd field masks for spte */
 #define VTD_SPTE_SNP 0x800ULL
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index ba0ff51183..8d84c22458 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -79,7 +79,10 @@
     { "qemu64-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },\
     { "athlon-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, },
 
-GlobalProperty pc_compat_9_1[] = {};
+GlobalProperty pc_compat_9_1[] = {
+    { "ICH9-LPC", "x-smi-swsmi-timer", "off" },
+    { "ICH9-LPC", "x-smi-periodic-timer", "off" },
+};
 const size_t pc_compat_9_1_len = G_N_ELEMENTS(pc_compat_9_1);
 
 GlobalProperty pc_compat_9_0[] = {
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index bd727b2320..ab17b76f54 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -43,6 +43,7 @@
 #include "hw/southbridge/ich9.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/ich9.h"
+#include "hw/acpi/ich9_timer.h"
 #include "hw/pci/pci_bus.h"
 #include "hw/qdev-properties.h"
 #include "sysemu/runstate.h"
@@ -531,6 +532,15 @@ ich9_lpc_pmcon_update(ICH9LPCState *lpc)
     uint16_t gen_pmcon_1 = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1);
     uint16_t wmask;
 
+    if (lpc->pm.swsmi_timer_enabled) {
+        ich9_pm_update_swsmi_timer(
+            &lpc->pm, lpc->pm.smi_en & ICH9_PMIO_SMI_EN_SWSMI_EN);
+    }
+    if (lpc->pm.periodic_timer_enabled) {
+        ich9_pm_update_periodic_timer(
+            &lpc->pm, lpc->pm.smi_en & ICH9_PMIO_SMI_EN_PERIODIC_EN);
+    }
+
     if (gen_pmcon_1 & ICH9_LPC_GEN_PMCON_1_SMI_LOCK) {
         wmask = pci_get_word(lpc->d.wmask + ICH9_LPC_GEN_PMCON_1);
         wmask &= ~ICH9_LPC_GEN_PMCON_1_SMI_LOCK;
@@ -826,6 +836,10 @@ static Property ich9_lpc_properties[] = {
                       ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT, true),
     DEFINE_PROP_BIT64("x-smi-cpu-hotunplug", ICH9LPCState, smi_host_features,
                       ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT, true),
+    DEFINE_PROP_BOOL("x-smi-swsmi-timer", ICH9LPCState,
+                     pm.swsmi_timer_enabled, true),
+    DEFINE_PROP_BOOL("x-smi-periodic-timer", ICH9LPCState,
+                     pm.periodic_timer_enabled, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 505b44c4e6..82591e3e07 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -592,6 +592,8 @@ OBJECT_DECLARE_SIMPLE_TYPE(ViaISAState, VIA_ISA)
 
 struct ViaISAState {
     PCIDevice dev;
+
+    IRQState i8259_irq;
     qemu_irq cpu_intr;
     qemu_irq *isa_irqs_in;
     uint16_t irq_state[ISA_NUM_IRQS];
@@ -715,13 +717,12 @@ static void via_isa_realize(PCIDevice *d, Error **errp)
     ViaISAState *s = VIA_ISA(d);
     DeviceState *dev = DEVICE(d);
     PCIBus *pci_bus = pci_get_bus(d);
-    qemu_irq *isa_irq;
     ISABus *isa_bus;
     int i;
 
     qdev_init_gpio_out_named(dev, &s->cpu_intr, "intr", 1);
     qdev_init_gpio_in_named(dev, via_isa_pirq, "pirq", PCI_NUM_PINS);
-    isa_irq = qemu_allocate_irqs(via_isa_request_i8259_irq, s, 1);
+    qemu_init_irq(&s->i8259_irq, via_isa_request_i8259_irq, s, 0);
     isa_bus = isa_bus_new(dev, pci_address_space(d), pci_address_space_io(d),
                           errp);
 
@@ -729,7 +730,7 @@ static void via_isa_realize(PCIDevice *d, Error **errp)
         return;
     }
 
-    s->isa_irqs_in = i8259_init(isa_bus, *isa_irq);
+    s->isa_irqs_in = i8259_init(isa_bus, &s->i8259_irq);
     isa_bus_register_input_irqs(isa_bus, s->isa_irqs_in);
     i8254_pit_init(isa_bus, 0x40, 0, NULL);
     i8257_dma_init(OBJECT(d), isa_bus, 0);
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index dedf9ad7c2..997aab0557 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -162,6 +162,135 @@ void vhost_net_save_acked_features(NetClientState *nc)
 #endif
 }
 
+static void vhost_net_disable_notifiers_nvhosts(VirtIODevice *dev,
+                NetClientState *ncs, int data_queue_pairs, int nvhosts)
+{
+    VirtIONet *n = VIRTIO_NET(dev);
+    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+    struct vhost_net *net;
+    struct vhost_dev *hdev;
+    int r, i, j;
+    NetClientState *peer;
+
+    /*
+     * Batch all the host notifiers in a single transaction to avoid
+     * quadratic time complexity in address_space_update_ioeventfds().
+     */
+    memory_region_transaction_begin();
+
+    for (i = 0; i < nvhosts; i++) {
+        if (i < data_queue_pairs) {
+            peer = qemu_get_peer(ncs, i);
+        } else {
+            peer = qemu_get_peer(ncs, n->max_queue_pairs);
+        }
+
+        net = get_vhost_net(peer);
+        hdev = &net->dev;
+        for (j = 0; j < hdev->nvqs; j++) {
+            r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus),
+                                             hdev->vq_index + j,
+                                             false);
+            if (r < 0) {
+                error_report("vhost %d VQ %d notifier cleanup failed: %d",
+                              i, j, -r);
+            }
+            assert(r >= 0);
+        }
+    }
+    /*
+     * The transaction expects the ioeventfds to be open when it
+     * commits. Do it now, before the cleanup loop.
+     */
+    memory_region_transaction_commit();
+
+    for (i = 0; i < nvhosts; i++) {
+        if (i < data_queue_pairs) {
+            peer = qemu_get_peer(ncs, i);
+        } else {
+            peer = qemu_get_peer(ncs, n->max_queue_pairs);
+        }
+
+        net = get_vhost_net(peer);
+        hdev = &net->dev;
+        for (j = 0; j < hdev->nvqs; j++) {
+            virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus),
+                                             hdev->vq_index + j);
+        }
+        virtio_device_release_ioeventfd(dev);
+    }
+}
+
+static int vhost_net_enable_notifiers(VirtIODevice *dev,
+                NetClientState *ncs, int data_queue_pairs, int cvq)
+{
+    VirtIONet *n = VIRTIO_NET(dev);
+    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+    int nvhosts = data_queue_pairs + cvq;
+    struct vhost_net *net;
+    struct vhost_dev *hdev;
+    int r, i, j;
+    NetClientState *peer;
+
+    /*
+     * Batch all the host notifiers in a single transaction to avoid
+     * quadratic time complexity in address_space_update_ioeventfds().
+     */
+    memory_region_transaction_begin();
+
+    for (i = 0; i < nvhosts; i++) {
+        if (i < data_queue_pairs) {
+            peer = qemu_get_peer(ncs, i);
+        } else {
+            peer = qemu_get_peer(ncs, n->max_queue_pairs);
+        }
+
+        net = get_vhost_net(peer);
+        hdev = &net->dev;
+        /*
+         * We will pass the notifiers to the kernel, make sure that QEMU
+         * doesn't interfere.
+         */
+        r = virtio_device_grab_ioeventfd(dev);
+        if (r < 0) {
+            error_report("binding does not support host notifiers");
+            memory_region_transaction_commit();
+            goto fail_nvhosts;
+        }
+
+        for (j = 0; j < hdev->nvqs; j++) {
+            r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus),
+                                             hdev->vq_index + j,
+                                             true);
+            if (r < 0) {
+                error_report("vhost %d VQ %d notifier binding failed: %d",
+                              i, j, -r);
+                memory_region_transaction_commit();
+                vhost_dev_disable_notifiers_nvqs(hdev, dev, j);
+                goto fail_nvhosts;
+            }
+        }
+    }
+
+    memory_region_transaction_commit();
+
+    return 0;
+fail_nvhosts:
+    vhost_net_disable_notifiers_nvhosts(dev, ncs, data_queue_pairs, i);
+    return r;
+}
+
+/*
+ * Stop processing guest IO notifications in qemu.
+ * Start processing them in vhost in kernel.
+ */
+static void vhost_net_disable_notifiers(VirtIODevice *dev,
+                NetClientState *ncs, int data_queue_pairs, int cvq)
+{
+    vhost_net_disable_notifiers_nvhosts(dev, ncs, data_queue_pairs,
+                                        data_queue_pairs + cvq);
+}
+
 static int vhost_net_get_fd(NetClientState *backend)
 {
     switch (backend->info->type) {
@@ -272,11 +401,6 @@ static int vhost_net_start_one(struct vhost_net *net,
         }
     }
 
-    r = vhost_dev_enable_notifiers(&net->dev, dev);
-    if (r < 0) {
-        goto fail_notifiers;
-    }
-
     r = vhost_dev_start(&net->dev, dev, false);
     if (r < 0) {
         goto fail_start;
@@ -328,8 +452,6 @@ fail:
     }
     vhost_dev_stop(&net->dev, dev, false);
 fail_start:
-    vhost_dev_disable_notifiers(&net->dev, dev);
-fail_notifiers:
     return r;
 }
 
@@ -351,7 +473,6 @@ static void vhost_net_stop_one(struct vhost_net *net,
     if (net->nc->info->stop) {
         net->nc->info->stop(net->nc);
     }
-    vhost_dev_disable_notifiers(&net->dev, dev);
 }
 
 int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
@@ -396,10 +517,16 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
         }
      }
 
+    r = vhost_net_enable_notifiers(dev, ncs, data_queue_pairs, cvq);
+    if (r < 0) {
+        error_report("Error enabling host notifiers: %d", -r);
+        goto err;
+    }
+
     r = k->set_guest_notifiers(qbus->parent, total_notifiers, true);
     if (r < 0) {
         error_report("Error binding guest notifier: %d", -r);
-        goto err;
+        goto err_host_notifiers;
     }
 
     for (i = 0; i < nvhosts; i++) {
@@ -414,19 +541,19 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
             r = vhost_set_vring_enable(peer, peer->vring_enable);
 
             if (r < 0) {
-                goto err_start;
+                goto err_guest_notifiers;
             }
         }
 
         r = vhost_net_start_one(get_vhost_net(peer), dev);
         if (r < 0) {
-            goto err_start;
+            goto err_guest_notifiers;
         }
     }
 
     return 0;
 
-err_start:
+err_guest_notifiers:
     while (--i >= 0) {
         peer = qemu_get_peer(ncs, i < data_queue_pairs ?
                                   i : n->max_queue_pairs);
@@ -437,6 +564,8 @@ err_start:
         fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
         fflush(stderr);
     }
+err_host_notifiers:
+    vhost_net_disable_notifiers(dev, ncs, data_queue_pairs, cvq);
 err:
     return r;
 }
@@ -468,6 +597,8 @@ void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
         fflush(stderr);
     }
     assert(r >= 0);
+
+    vhost_net_disable_notifiers(dev, ncs, data_queue_pairs, cvq);
 }
 
 void vhost_net_cleanup(struct vhost_net *net)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index ed33a32877..fb84d142ee 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3896,8 +3896,23 @@ static bool dev_unplug_pending(void *opaque)
 static struct vhost_dev *virtio_net_get_vhost(VirtIODevice *vdev)
 {
     VirtIONet *n = VIRTIO_NET(vdev);
-    NetClientState *nc = qemu_get_queue(n->nic);
-    struct vhost_net *net = get_vhost_net(nc->peer);
+    NetClientState *nc;
+    struct vhost_net *net;
+
+    if (!n->nic) {
+        return NULL;
+    }
+
+    nc = qemu_get_queue(n->nic);
+    if (!nc) {
+        return NULL;
+    }
+
+    net = get_vhost_net(nc->peer);
+    if (!net) {
+        return NULL;
+    }
+
     return &net->dev;
 }
 
diff --git a/hw/pci/pci-hmp-cmds.c b/hw/pci/pci-hmp-cmds.c
index b09fce9377..fdfe44435c 100644
--- a/hw/pci/pci-hmp-cmds.c
+++ b/hw/pci/pci-hmp-cmds.c
@@ -83,15 +83,25 @@ static void hmp_info_pci_device(Monitor *mon, const PciDeviceInfo *dev)
         monitor_printf(mon, "      BAR%" PRId64 ": ", region->value->bar);
 
         if (!strcmp(region->value->type, "io")) {
-            monitor_printf(mon, "I/O at 0x%04" PRIx64
-                                " [0x%04" PRIx64 "].\n",
-                           addr, addr + size - 1);
+            if (addr != PCI_BAR_UNMAPPED) {
+                monitor_printf(mon, "I/O at 0x%04" PRIx64
+                                    " [0x%04" PRIx64 "]\n",
+                               addr, addr + size - 1);
+            } else {
+                monitor_printf(mon, "I/O (not mapped)\n");
+            }
         } else {
-            monitor_printf(mon, "%d bit%s memory at 0x%08" PRIx64
-                               " [0x%08" PRIx64 "].\n",
-                           region->value->mem_type_64 ? 64 : 32,
-                           region->value->prefetch ? " prefetchable" : "",
-                           addr, addr + size - 1);
+            if (addr != PCI_BAR_UNMAPPED) {
+                monitor_printf(mon, "%d bit%s memory at 0x%08" PRIx64
+                                   " [0x%08" PRIx64 "]\n",
+                               region->value->mem_type_64 ? 64 : 32,
+                               region->value->prefetch ? " prefetchable" : "",
+                               addr, addr + size - 1);
+            } else {
+                monitor_printf(mon, "%d bit%s memory (not mapped)\n",
+                               region->value->mem_type_64 ? 64 : 32,
+                               region->value->prefetch ? " prefetchable" : "");
+            }
         }
     }
 
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index d2caf3ee8b..87da35ca9b 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1181,14 +1181,15 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
                    PCI_SLOT(devfn), PCI_FUNC(devfn), name,
                    bus->devices[devfn]->name, bus->devices[devfn]->qdev.id);
         return NULL;
-    } /*
-       * Populating function 0 triggers a scan from the guest that
-       * exposes other non-zero functions. Hence we need to ensure that
-       * function 0 wasn't added yet.
-       */
-    else if (dev->hotplugged &&
-             !pci_is_vf(pci_dev) &&
-             pci_get_function_0(pci_dev)) {
+    }
+
+    /*
+     * Populating function 0 triggers a scan from the guest that
+     * exposes other non-zero functions. Hence we need to ensure that
+     * function 0 wasn't added yet.
+     */
+    if (dev->hotplugged && !pci_is_vf(pci_dev) &&
+        pci_get_function_0(pci_dev)) {
         error_setg(errp, "PCI: slot %d function 0 already occupied by %s,"
                    " new func %s cannot be exposed to guest.",
                    PCI_SLOT(pci_get_function_0(pci_dev)->devfn),
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 06fc71746e..7c5ef81b55 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1682,9 +1682,9 @@ void vhost_dev_cleanup(struct vhost_dev *hdev)
     memset(hdev, 0, sizeof(struct vhost_dev));
 }
 
-static void vhost_dev_disable_notifiers_nvqs(struct vhost_dev *hdev,
-                                             VirtIODevice *vdev,
-                                             unsigned int nvqs)
+void vhost_dev_disable_notifiers_nvqs(struct vhost_dev *hdev,
+                                      VirtIODevice *vdev,
+                                      unsigned int nvqs)
 {
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     int i, r;
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index 6e9d8293da..c3ffd8328d 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -1247,9 +1247,21 @@ static bool virtio_crypto_guest_notifier_pending(VirtIODevice *vdev, int idx)
 static struct vhost_dev *virtio_crypto_get_vhost(VirtIODevice *vdev)
 {
     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
-    CryptoDevBackend *b = vcrypto->cryptodev;
-    CryptoDevBackendClient *cc = b->conf.peers.ccs[0];
-    CryptoDevBackendVhost *vhost_crypto = cryptodev_get_vhost(cc, b, 0);
+    CryptoDevBackend *b;
+    CryptoDevBackendClient *cc;
+    CryptoDevBackendVhost *vhost_crypto;
+
+    b = vcrypto->cryptodev;
+    if (!b) {
+        return NULL;
+    }
+
+    cc = b->conf.peers.ccs[0];
+    vhost_crypto = cryptodev_get_vhost(cc, b, 0);
+    if (!vhost_crypto) {
+        return NULL;
+    }
+
     return &vhost_crypto->dev;
 }
 
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index ef64bf1b4a..4075f3d4ce 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -88,6 +88,7 @@ static uint32_t virtio_mem_default_thp_size(void)
 static uint32_t thp_size;
 
 #define HPAGE_PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size"
+#define HPAGE_PATH "/sys/kernel/mm/transparent_hugepage/"
 static uint32_t virtio_mem_thp_size(void)
 {
     gchar *content = NULL;
@@ -98,6 +99,12 @@ static uint32_t virtio_mem_thp_size(void)
         return thp_size;
     }
 
+    /* No THP -> no restrictions. */
+    if (!g_file_test(HPAGE_PATH, G_FILE_TEST_EXISTS)) {
+        thp_size = VIRTIO_MEM_MIN_BLOCK_SIZE;
+        return thp_size;
+    }
+
     /*
      * Try to probe the actual THP size, fallback to (sane but eventually
      * incorrect) default sizes.
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 524b63e5c7..4d832fe845 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -615,8 +615,12 @@ static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
         reg = &proxy->regs[i];
         if (*off >= reg->offset &&
             *off + len <= reg->offset + reg->size) {
-            *off -= reg->offset;
-            return &reg->mr;
+            MemoryRegionSection mrs = memory_region_find(&reg->mr,
+                                        *off - reg->offset, len);
+            assert(mrs.mr);
+            *off = mrs.offset_within_region;
+            memory_region_unref(mrs.mr);
+            return mrs.mr;
         }
     }
 
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 9e10cbc058..a26f18908e 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2331,8 +2331,12 @@ void virtio_reset(void *opaque)
         vdev->device_endian = virtio_default_endian();
     }
 
-    if (vdev->vhost_started && k->get_vhost) {
-        vhost_reset_device(k->get_vhost(vdev));
+    if (k->get_vhost) {
+        struct vhost_dev *hdev = k->get_vhost(vdev);
+        /* Only reset when vhost back-end is connected */
+        if (hdev && hdev->vhost_ops) {
+            vhost_reset_device(hdev);
+        }
     }
 
     if (k->reset) {
@@ -3665,7 +3669,7 @@ static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n)
     return;
 }
 
-static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n)
+static void virtio_queue_split_update_used_idx(VirtIODevice *vdev, int n)
 {
     RCU_READ_LOCK_GUARD();
     if (vdev->vq[n].vring.desc) {
@@ -3678,7 +3682,7 @@ void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)
     if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
         return virtio_queue_packed_update_used_idx(vdev, n);
     } else {
-        return virtio_split_packed_update_used_idx(vdev, n);
+        return virtio_queue_split_update_used_idx(vdev, n);
     }
 }
 
diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index 2faf7f0cae..245fe08dc2 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -46,6 +46,7 @@ typedef struct ICH9LPCPMRegs {
     uint32_t smi_en;
     uint32_t smi_en_wmask;
     uint32_t smi_sts;
+    uint32_t smi_sts_wmask;
 
     qemu_irq irq;      /* SCI */
 
@@ -68,6 +69,11 @@ typedef struct ICH9LPCPMRegs {
     bool smm_compat;
     bool enable_tco;
     TCOIORegs tco_regs;
+
+    bool swsmi_timer_enabled;
+    bool periodic_timer_enabled;
+    QEMUTimer *swsmi_timer;
+    QEMUTimer *periodic_timer;
 } ICH9LPCPMRegs;
 
 #define ACPI_PM_PROP_TCO_ENABLED "enable_tco"
diff --git a/include/hw/acpi/ich9_timer.h b/include/hw/acpi/ich9_timer.h
new file mode 100644
index 0000000000..5112df4385
--- /dev/null
+++ b/include/hw/acpi/ich9_timer.h
@@ -0,0 +1,23 @@
+/*
+ * QEMU ICH9 Timer emulation
+ *
+ * Copyright (c) 2024 Dominic Prinz <git@dprinz.de>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_ACPI_ICH9_TIMER_H
+#define HW_ACPI_ICH9_TIMER_H
+
+#include "hw/acpi/ich9.h"
+
+void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable);
+
+void ich9_pm_swsmi_timer_init(ICH9LPCPMRegs *pm);
+
+void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable);
+
+void ich9_pm_periodic_timer_init(ICH9LPCPMRegs *pm);
+
+#endif
diff --git a/include/hw/irq.h b/include/hw/irq.h
index 645b73d251..c861c1debd 100644
--- a/include/hw/irq.h
+++ b/include/hw/irq.h
@@ -1,9 +1,20 @@
 #ifndef QEMU_IRQ_H
 #define QEMU_IRQ_H
 
+#include "qom/object.h"
+
 /* Generic IRQ/GPIO pin infrastructure.  */
 
 #define TYPE_IRQ "irq"
+OBJECT_DECLARE_SIMPLE_TYPE(IRQState, IRQ)
+
+struct IRQState {
+    Object parent_obj;
+
+    qemu_irq_handler handler;
+    void *opaque;
+    int n;
+};
 
 void qemu_set_irq(qemu_irq irq, int level);
 
@@ -23,6 +34,13 @@ static inline void qemu_irq_pulse(qemu_irq irq)
     qemu_set_irq(irq, 0);
 }
 
+/*
+ * Init a single IRQ. The irq is assigned with a handler, an opaque data
+ * and the interrupt number.
+ */
+void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
+                   int n);
+
 /* Returns an array of N IRQs. Each IRQ is assigned the argument handler and
  * opaque data.
  */
diff --git a/include/hw/southbridge/ich9.h b/include/hw/southbridge/ich9.h
index fd01649d04..6c60017024 100644
--- a/include/hw/southbridge/ich9.h
+++ b/include/hw/southbridge/ich9.h
@@ -196,8 +196,12 @@ struct ICH9LPCState {
 #define ICH9_PMIO_GPE0_LEN                      16
 #define ICH9_PMIO_SMI_EN                        0x30
 #define ICH9_PMIO_SMI_EN_APMC_EN                (1 << 5)
+#define ICH9_PMIO_SMI_EN_SWSMI_EN               (1 << 6)
 #define ICH9_PMIO_SMI_EN_TCO_EN                 (1 << 13)
+#define ICH9_PMIO_SMI_EN_PERIODIC_EN            (1 << 14)
 #define ICH9_PMIO_SMI_STS                       0x34
+#define ICH9_PMIO_SMI_STS_SWSMI_STS             (1 << 6)
+#define ICH9_PMIO_SMI_STS_PERIODIC_STS          (1 << 14)
 #define ICH9_PMIO_TCO_RLD                       0x60
 #define ICH9_PMIO_TCO_LEN                       32
 
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index d75faf46e9..c75be46c06 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -171,6 +171,10 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
  */
 void vhost_dev_cleanup(struct vhost_dev *hdev);
 
+void vhost_dev_disable_notifiers_nvqs(struct vhost_dev *hdev,
+                                      VirtIODevice *vdev,
+                                      unsigned int nvqs);
+
 /**
  * vhost_dev_enable_notifiers() - enable event notifiers
  * @hdev: common vhost_dev structure
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 0fcbc5c0c6..f526ecc8fc 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -223,6 +223,7 @@ struct VirtioDeviceClass {
     int (*post_load)(VirtIODevice *vdev);
     const VMStateDescription *vmsd;
     bool (*primary_unplug_pending)(void *opaque);
+    /* May be called even when vdev->vhost_started is false */
     struct vhost_dev *(*get_vhost)(VirtIODevice *vdev);
     void (*toggle_device_iotlb)(VirtIODevice *vdev);
 };
diff --git a/tests/data/acpi/x86/pc/DSDT b/tests/data/acpi/x86/pc/DSDT
index c93ad6b7f8..92225236e7 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.acpierst b/tests/data/acpi/x86/pc/DSDT.acpierst
index f643fa2d03..25b3995505 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.acpihmat b/tests/data/acpi/x86/pc/DSDT.acpihmat
index 9d3695ff28..73a9ce59e9 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.bridge b/tests/data/acpi/x86/pc/DSDT.bridge
index 840b45f354..4cef454e37 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.cphp b/tests/data/acpi/x86/pc/DSDT.cphp
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index 1294f655d4..9f71d2e58b 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.hpbrroot b/tests/data/acpi/x86/pc/DSDT.hpbrroot
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index 0a891baf45..c2a0330d97 100644
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diff --git a/tests/data/acpi/x86/pc/DSDT.numamem b/tests/data/acpi/x86/pc/DSDT.numamem
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index e654c83ebe..a16b0d9d4b 100644
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