Merge tag 'pull-xen-20230607' of https://xenbits.xen.org/git-http/people/aperard/qemu-dm into staging

Xen queue

- fix for xen-block segv
- Resolve TYPE_PIIX3_XEN_DEVICE
- Xen emulation build/Coverity fixes

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# gpg: Good signature from "Anthony PERARD <anthony.perard@gmail.com>" [unknown]
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* tag 'pull-xen-20230607' of https://xenbits.xen.org/git-http/people/aperard/qemu-dm:
  xen-block: fix segv on unrealize
  hw/isa/piix3: Resolve redundant TYPE_PIIX3_XEN_DEVICE
  hw/isa/piix3: Resolve redundant k->config_write assignments
  hw/isa/piix3: Avoid Xen-specific variant of piix3_write_config()
  hw/isa/piix3: Wire up Xen PCI IRQ handling outside of PIIX3
  hw/isa/piix3: Reuse piix3_realize() in piix3_xen_realize()
  hw/pci/pci.c: Don't leak PCIBus::irq_count[] in pci_bus_irqs()
  include/hw/xen/xen: Rename xen_piix3_set_irq() to xen_intx_set_irq()
  hw/xen: Fix broken check for invalid state in xs_be_open()
  xen: Drop support for Xen versions below 4.7.1
  hw/xen: Fix memory leak in libxenstore_open() for Xen
  hw/xen: Simplify emulated Xen platform init

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

16 files changed, 73 insertions, 327 deletions

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index 3048329..3d810db 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -147,7 +147,10 @@ struct XenEvtchnState {
     QemuMutex port_lock;
     uint32_t nr_ports;
     XenEvtchnPort port_table[EVTCHN_2L_NR_CHANNELS];
-    qemu_irq gsis[IOAPIC_NUM_PINS];
+
+    /* Connected to the system GSIs for raising callback as GSI / INTx */
+    unsigned int nr_callback_gsis;
+    qemu_irq *callback_gsis;
 
     struct xenevtchn_handle *be_handles[EVTCHN_2L_NR_CHANNELS];
 
@@ -299,7 +302,7 @@ static void gsi_assert_bh(void *opaque)
     }
 }
 
-void xen_evtchn_create(void)
+void xen_evtchn_create(unsigned int nr_gsis, qemu_irq *system_gsis)
 {
     XenEvtchnState *s = XEN_EVTCHN(sysbus_create_simple(TYPE_XEN_EVTCHN,
                                                         -1, NULL));
@@ -310,8 +313,19 @@ void xen_evtchn_create(void)
     qemu_mutex_init(&s->port_lock);
     s->gsi_bh = aio_bh_new(qemu_get_aio_context(), gsi_assert_bh, s);
 
-    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
-        sysbus_init_irq(SYS_BUS_DEVICE(s), &s->gsis[i]);
+    /*
+     * These are the *output* GSI from event channel support, for
+     * signalling CPU0's events via GSI or PCI INTx instead of the
+     * per-CPU vector. We create a *set* of irqs and connect one to
+     * each of the system GSIs which were passed in from the platform
+     * code, and then just trigger the right one as appropriate from
+     * xen_evtchn_set_callback_level().
+     */
+    s->nr_callback_gsis = nr_gsis;
+    s->callback_gsis = g_new0(qemu_irq, nr_gsis);
+    for (i = 0; i < nr_gsis; i++) {
+        sysbus_init_irq(SYS_BUS_DEVICE(s), &s->callback_gsis[i]);
+        sysbus_connect_irq(SYS_BUS_DEVICE(s), i, system_gsis[i]);
     }
 
     /*
@@ -336,20 +350,6 @@ void xen_evtchn_create(void)
     xen_evtchn_ops = &emu_evtchn_backend_ops;
 }
 
-void xen_evtchn_connect_gsis(qemu_irq *system_gsis)
-{
-    XenEvtchnState *s = xen_evtchn_singleton;
-    int i;
-
-    if (!s) {
-        return;
-    }
-
-    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
-        sysbus_connect_irq(SYS_BUS_DEVICE(s), i, system_gsis[i]);
-    }
-}
-
 static void xen_evtchn_register_types(void)
 {
     type_register_static(&xen_evtchn_info);
@@ -430,8 +430,8 @@ void xen_evtchn_set_callback_level(int level)
         return;
     }
 
-    if (s->callback_gsi && s->callback_gsi < IOAPIC_NUM_PINS) {
-        qemu_set_irq(s->gsis[s->callback_gsi], level);
+    if (s->callback_gsi && s->callback_gsi < s->nr_callback_gsis) {
+        qemu_set_irq(s->callback_gsis[s->callback_gsi], level);
         if (level) {
             /* Ensure the vCPU polls for deassertion */
             kvm_xen_set_callback_asserted();
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index bfb67ac..b740acf 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -16,10 +16,9 @@
 
 typedef uint32_t evtchn_port_t;
 
-void xen_evtchn_create(void);
+void xen_evtchn_create(unsigned int nr_gsis, qemu_irq *system_gsis);
 int xen_evtchn_soft_reset(void);
 int xen_evtchn_set_callback_param(uint64_t param);
-void xen_evtchn_connect_gsis(qemu_irq *system_gsis);
 void xen_evtchn_set_callback_level(int level);
 
 int xen_evtchn_set_port(uint16_t port);
diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c
index 0b189c6..133d89e 100644
--- a/hw/i386/kvm/xen_xenstore.c
+++ b/hw/i386/kvm/xen_xenstore.c
@@ -1688,7 +1688,7 @@ static struct qemu_xs_handle *xs_be_open(void)
     XenXenstoreState *s = xen_xenstore_singleton;
     struct qemu_xs_handle *h;
 
-    if (!s && !s->impl) {
+    if (!s || !s->impl) {
         errno = -ENOSYS;
         return NULL;
     }
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index bb62c99..fc52772 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1332,7 +1332,10 @@ void pc_basic_device_init(struct PCMachineState *pcms,
 
 #ifdef CONFIG_XEN_EMU
     if (xen_mode == XEN_EMULATE) {
-        xen_evtchn_connect_gsis(gsi);
+        xen_overlay_create();
+        xen_evtchn_create(IOAPIC_NUM_PINS, gsi);
+        xen_gnttab_create();
+        xen_xenstore_create();
         if (pcms->bus) {
             pci_create_simple(pcms->bus, -1, "xen-platform");
         }
@@ -1882,14 +1885,6 @@ static void pc_machine_initfn(Object *obj)
 
 int pc_machine_kvm_type(MachineState *machine, const char *kvm_type)
 {
-#ifdef CONFIG_XEN_EMU
-    if (xen_mode == XEN_EMULATE) {
-        xen_overlay_create();
-        xen_evtchn_create();
-        xen_gnttab_create();
-        xen_xenstore_create();
-    }
-#endif
     return 0;
 }
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d5b0dcd..42af03d 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -71,6 +71,7 @@
 #include "kvm/kvm-cpu.h"
 
 #define MAX_IDE_BUS 2
+#define XEN_IOAPIC_NUM_PIRQS 128ULL
 
 #ifdef CONFIG_IDE_ISA
 static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 };
@@ -89,6 +90,21 @@ static int pc_pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
     return (pci_intx + slot_addend) & 3;
 }
 
+static void piix_intx_routing_notifier_xen(PCIDevice *dev)
+{
+    int i;
+
+    /* Scan for updates to PCI link routes (0x60-0x63). */
+    for (i = 0; i < PIIX_NUM_PIRQS; i++) {
+        uint8_t v = dev->config_read(dev, PIIX_PIRQCA + i, 1);
+        if (v & 0x80) {
+            v = 0;
+        }
+        v &= 0xf;
+        xen_set_pci_link_route(i, v);
+    }
+}
+
 /* PC hardware initialisation */
 static void pc_init1(MachineState *machine,
                      const char *host_type, const char *pci_type)
@@ -223,8 +239,6 @@ static void pc_init1(MachineState *machine,
     if (pcmc->pci_enabled) {
         PIIX3State *piix3;
         PCIDevice *pci_dev;
-        const char *type = xen_enabled() ? TYPE_PIIX3_XEN_DEVICE
-                                         : TYPE_PIIX3_DEVICE;
 
         pci_bus = i440fx_init(pci_type,
                               i440fx_host,
@@ -237,7 +251,23 @@ static void pc_init1(MachineState *machine,
                                        : pc_pci_slot_get_pirq);
         pcms->bus = pci_bus;
 
-        pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
+        pci_dev = pci_create_simple_multifunction(pci_bus, -1, true,
+                                                  TYPE_PIIX3_DEVICE);
+
+        if (xen_enabled()) {
+            pci_device_set_intx_routing_notifier(
+                        pci_dev, piix_intx_routing_notifier_xen);
+
+            /*
+             * Xen supports additional interrupt routes from the PCI devices to
+             * the IOAPIC: the four pins of each PCI device on the bus are also
+             * connected to the IOAPIC directly.
+             * These additional routes can be discovered through ACPI.
+             */
+            pci_bus_irqs(pci_bus, xen_intx_set_irq, pci_dev,
+                         XEN_IOAPIC_NUM_PIRQS);
+        }
+
         piix3 = PIIX3_PCI_DEVICE(pci_dev);
         piix3->pic = x86ms->gsi;
         piix3_devfn = piix3->dev.devfn;
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 56641a5..ab8f1b6 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -143,7 +143,7 @@ int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
     return irq_num + (PCI_SLOT(pci_dev->devfn) << 2);
 }
 
-void xen_piix3_set_irq(void *opaque, int irq_num, int level)
+void xen_intx_set_irq(void *opaque, int irq_num, int level)
 {
     xen_set_pci_intx_level(xen_domid, 0, 0, irq_num >> 2,
                            irq_num & 3, level);
diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index f9103ea..117024e 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -30,13 +30,10 @@
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "hw/isa/isa.h"
-#include "hw/xen/xen.h"
 #include "sysemu/runstate.h"
 #include "migration/vmstate.h"
 #include "hw/acpi/acpi_aml_interface.h"
 
-#define XEN_PIIX_NUM_PIRQS      128ULL
-
 static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)
 {
     qemu_set_irq(piix3->pic[pic_irq],
@@ -124,26 +121,6 @@ static void piix3_write_config(PCIDevice *dev,
     }
 }
 
-static void piix3_write_config_xen(PCIDevice *dev,
-                                   uint32_t address, uint32_t val, int len)
-{
-    int i;
-
-    /* Scan for updates to PCI link routes (0x60-0x63). */
-    for (i = 0; i < len; i++) {
-        uint8_t v = (val >> (8 * i)) & 0xff;
-        if (v & 0x80) {
-            v = 0;
-        }
-        v &= 0xf;
-        if (((address + i) >= PIIX_PIRQCA) && ((address + i) <= PIIX_PIRQCD)) {
-            xen_set_pci_link_route(address + i - PIIX_PIRQCA, v);
-        }
-    }
-
-    piix3_write_config(dev, address, val, len);
-}
-
 static void piix3_reset(DeviceState *dev)
 {
     PIIX3State *d = PIIX3_PCI_DEVICE(dev);
@@ -344,6 +321,7 @@ static void pci_piix3_class_init(ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
     AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
 
+    k->config_write = piix3_write_config;
     dc->reset       = piix3_reset;
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
@@ -393,7 +371,6 @@ static void piix3_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->config_write = piix3_write_config;
     k->realize = piix3_realize;
 }
 
@@ -403,45 +380,10 @@ static const TypeInfo piix3_info = {
     .class_init    = piix3_class_init,
 };
 
-static void piix3_xen_realize(PCIDevice *dev, Error **errp)
-{
-    ERRP_GUARD();
-    PIIX3State *piix3 = PIIX3_PCI_DEVICE(dev);
-    PCIBus *pci_bus = pci_get_bus(dev);
-
-    pci_piix3_realize(dev, errp);
-    if (*errp) {
-        return;
-    }
-
-    /*
-     * Xen supports additional interrupt routes from the PCI devices to
-     * the IOAPIC: the four pins of each PCI device on the bus are also
-     * connected to the IOAPIC directly.
-     * These additional routes can be discovered through ACPI.
-     */
-    pci_bus_irqs(pci_bus, xen_piix3_set_irq, piix3, XEN_PIIX_NUM_PIRQS);
-}
-
-static void piix3_xen_class_init(ObjectClass *klass, void *data)
-{
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->config_write = piix3_write_config_xen;
-    k->realize = piix3_xen_realize;
-}
-
-static const TypeInfo piix3_xen_info = {
-    .name          = TYPE_PIIX3_XEN_DEVICE,
-    .parent        = TYPE_PIIX3_PCI_DEVICE,
-    .class_init    = piix3_xen_class_init,
-};
-
 static void piix3_register_types(void)
 {
     type_register_static(&piix3_pci_type_info);
     type_register_static(&piix3_info);
-    type_register_static(&piix3_xen_info);
 }
 
 type_init(piix3_register_types)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 1cc7c89..9b7b4d7 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -560,6 +560,7 @@ void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq,
     bus->set_irq = set_irq;
     bus->irq_opaque = irq_opaque;
     bus->nirq = nirq;
+    g_free(bus->irq_count);
     bus->irq_count = g_malloc0(nirq * sizeof(bus->irq_count[0]));
 }
 
@@ -575,6 +576,7 @@ void pci_bus_irqs_cleanup(PCIBus *bus)
     bus->irq_opaque = NULL;
     bus->nirq = 0;
     g_free(bus->irq_count);
+    bus->irq_count = NULL;
 }
 
 PCIBus *pci_register_root_bus(DeviceState *parent, const char *name,
diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index 1e08cf0..ece8ec4 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -923,8 +923,10 @@ void xen_device_unbind_event_channel(XenDevice *xendev,
 
     QLIST_REMOVE(channel, list);
 
-    aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh),
-                       NULL, NULL, NULL, NULL, NULL);
+    if (channel->ctx) {
+        aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh),
+                           NULL, NULL, NULL, NULL, NULL);
+    }
 
     if (qemu_xen_evtchn_unbind(channel->xeh, channel->local_port) < 0) {
         error_setg_errno(errp, errno, "xenevtchn_unbind failed");
diff --git a/hw/xen/xen-operations.c b/hw/xen/xen-operations.c
index 4b78fbf..e00983e 100644
--- a/hw/xen/xen-operations.c
+++ b/hw/xen/xen-operations.c
@@ -28,46 +28,13 @@
 #include <xenctrl.h>
 
 /*
- * We don't support Xen prior to 4.2.0.
+ * We don't support Xen prior to 4.7.1.
  */
 
-/* Xen 4.2 through 4.6 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
-
-typedef xc_evtchn xenevtchn_handle;
-typedef evtchn_port_or_error_t xenevtchn_port_or_error_t;
-
-#define xenevtchn_open(l, f) xc_evtchn_open(l, f);
-#define xenevtchn_close(h) xc_evtchn_close(h)
-#define xenevtchn_fd(h) xc_evtchn_fd(h)
-#define xenevtchn_pending(h) xc_evtchn_pending(h)
-#define xenevtchn_notify(h, p) xc_evtchn_notify(h, p)
-#define xenevtchn_bind_interdomain(h, d, p) xc_evtchn_bind_interdomain(h, d, p)
-#define xenevtchn_unmask(h, p) xc_evtchn_unmask(h, p)
-#define xenevtchn_unbind(h, p) xc_evtchn_unbind(h, p)
-
-typedef xc_gnttab xengnttab_handle;
-
-#define xengnttab_open(l, f) xc_gnttab_open(l, f)
-#define xengnttab_close(h) xc_gnttab_close(h)
-#define xengnttab_set_max_grants(h, n) xc_gnttab_set_max_grants(h, n)
-#define xengnttab_map_grant_ref(h, d, r, p) xc_gnttab_map_grant_ref(h, d, r, p)
-#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n)
-#define xengnttab_map_grant_refs(h, c, d, r, p) \
-    xc_gnttab_map_grant_refs(h, c, d, r, p)
-#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \
-    xc_gnttab_map_domain_grant_refs(h, c, d, r, p)
-
-typedef xc_interface xenforeignmemory_handle;
-
-#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
-
 #include <xenevtchn.h>
 #include <xengnttab.h>
 #include <xenforeignmemory.h>
 
-#endif
-
 /* Xen before 4.8 */
 
 static int libxengnttab_fallback_grant_copy(xengnttab_handle *xgt,
@@ -223,26 +190,6 @@ static struct gnttab_backend_ops libxengnttab_backend_ops = {
     .unmap = libxengnttab_backend_unmap,
 };
 
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
-
-static void *libxenforeignmem_backend_map(uint32_t dom, void *addr, int prot,
-                                          size_t pages, xfn_pfn_t *pfns,
-                                          int *errs)
-{
-    if (errs) {
-        return xc_map_foreign_bulk(xen_xc, dom, prot, pfns, errs, pages);
-    } else {
-        return xc_map_foreign_pages(xen_xc, dom, prot, pfns, pages);
-    }
-}
-
-static int libxenforeignmem_backend_unmap(void *addr, size_t pages)
-{
-    return munmap(addr, pages * XC_PAGE_SIZE);
-}
-
-#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
-
 static void *libxenforeignmem_backend_map(uint32_t dom, void *addr, int prot,
                                           size_t pages, xen_pfn_t *pfns,
                                           int *errs)
@@ -256,8 +203,6 @@ static int libxenforeignmem_backend_unmap(void *addr, size_t pages)
     return xenforeignmemory_unmap(xen_fmem, addr, pages);
 }
 
-#endif
-
 struct foreignmem_backend_ops libxenforeignmem_backend_ops = {
     .map = libxenforeignmem_backend_map,
     .unmap = libxenforeignmem_backend_unmap,
@@ -287,7 +232,7 @@ static void watch_event(void *opaque)
 static struct qemu_xs_handle *libxenstore_open(void)
 {
     struct xs_handle *xsh = xs_open(0);
-    struct qemu_xs_handle *h = g_new0(struct qemu_xs_handle, 1);
+    struct qemu_xs_handle *h;
 
     if (!xsh) {
         return NULL;
diff --git a/include/hw/southbridge/piix.h b/include/hw/southbridge/piix.h
index a840340..2781717 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -67,7 +67,6 @@ DECLARE_INSTANCE_CHECKER(PIIX3State, PIIX3_PCI_DEVICE,
                          TYPE_PIIX3_PCI_DEVICE)
 
 #define TYPE_PIIX3_DEVICE "PIIX3"
-#define TYPE_PIIX3_XEN_DEVICE "PIIX3-xen"
 #define TYPE_PIIX4_PCI_DEVICE "piix4-isa"
 
 #endif
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 2bd8ec7..37ecc91 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -39,7 +39,7 @@ extern bool xen_domid_restrict;
 
 int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
 int xen_set_pci_link_route(uint8_t link, uint8_t irq);
-void xen_piix3_set_irq(void *opaque, int irq_num, int level);
+void xen_intx_set_irq(void *opaque, int irq_num, int level);
 void xen_hvm_inject_msi(uint64_t addr, uint32_t data);
 int xen_is_pirq_msi(uint32_t msi_data);
 
diff --git a/include/hw/xen/xen_native.h b/include/hw/xen/xen_native.h
index 6bcc83b..f11eb42 100644
--- a/include/hw/xen/xen_native.h
+++ b/include/hw/xen/xen_native.h
@@ -24,23 +24,11 @@
 extern xc_interface *xen_xc;
 
 /*
- * We don't support Xen prior to 4.2.0.
+ * We don't support Xen prior to 4.7.1.
  */
 
-/* Xen 4.2 through 4.6 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
-
-typedef xc_interface xenforeignmemory_handle;
-
-#define xenforeignmemory_open(l, f) xen_xc
-#define xenforeignmemory_close(h)
-
-#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
-
 #include <xenforeignmemory.h>
 
-#endif
-
 extern xenforeignmemory_handle *xen_fmem;
 
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40900
@@ -148,8 +136,6 @@ static inline xendevicemodel_handle *xendevicemodel_open(
     return xen_xc;
 }
 
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40500
-
 static inline int xendevicemodel_create_ioreq_server(
     xendevicemodel_handle *dmod, domid_t domid, int handle_bufioreq,
     ioservid_t *id)
@@ -211,8 +197,6 @@ static inline int xendevicemodel_set_ioreq_server_state(
     return xc_hvm_set_ioreq_server_state(dmod, domid, id, enabled);
 }
 
-#endif /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40500 */
-
 static inline int xendevicemodel_set_pci_intx_level(
     xendevicemodel_handle *dmod, domid_t domid, uint16_t segment,
     uint8_t bus, uint8_t device, uint8_t intx, unsigned int level)
@@ -340,15 +324,6 @@ static inline int xen_get_vmport_regs_pfn(xc_interface *xc, domid_t dom,
 }
 #endif
 
-/* Xen before 4.6 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40600
-
-#ifndef HVM_IOREQSRV_BUFIOREQ_ATOMIC
-#define HVM_IOREQSRV_BUFIOREQ_ATOMIC 2
-#endif
-
-#endif
-
 static inline int xen_get_default_ioreq_server_info(domid_t dom,
                                                     xen_pfn_t *ioreq_pfn,
                                                     xen_pfn_t *bufioreq_pfn,
@@ -386,84 +361,6 @@ static inline int xen_get_default_ioreq_server_info(domid_t dom,
     return 0;
 }
 
-/* Xen before 4.5 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40500
-
-#ifndef HVM_PARAM_BUFIOREQ_EVTCHN
-#define HVM_PARAM_BUFIOREQ_EVTCHN 26
-#endif
-
-#define IOREQ_TYPE_PCI_CONFIG 2
-
-typedef uint16_t ioservid_t;
-
-static inline void xen_map_memory_section(domid_t dom,
-                                          ioservid_t ioservid,
-                                          MemoryRegionSection *section)
-{
-}
-
-static inline void xen_unmap_memory_section(domid_t dom,
-                                            ioservid_t ioservid,
-                                            MemoryRegionSection *section)
-{
-}
-
-static inline void xen_map_io_section(domid_t dom,
-                                      ioservid_t ioservid,
-                                      MemoryRegionSection *section)
-{
-}
-
-static inline void xen_unmap_io_section(domid_t dom,
-                                        ioservid_t ioservid,
-                                        MemoryRegionSection *section)
-{
-}
-
-static inline void xen_map_pcidev(domid_t dom,
-                                  ioservid_t ioservid,
-                                  PCIDevice *pci_dev)
-{
-}
-
-static inline void xen_unmap_pcidev(domid_t dom,
-                                    ioservid_t ioservid,
-                                    PCIDevice *pci_dev)
-{
-}
-
-static inline void xen_create_ioreq_server(domid_t dom,
-                                           ioservid_t *ioservid)
-{
-}
-
-static inline void xen_destroy_ioreq_server(domid_t dom,
-                                            ioservid_t ioservid)
-{
-}
-
-static inline int xen_get_ioreq_server_info(domid_t dom,
-                                            ioservid_t ioservid,
-                                            xen_pfn_t *ioreq_pfn,
-                                            xen_pfn_t *bufioreq_pfn,
-                                            evtchn_port_t *bufioreq_evtchn)
-{
-    return xen_get_default_ioreq_server_info(dom, ioreq_pfn,
-                                             bufioreq_pfn,
-                                             bufioreq_evtchn);
-}
-
-static inline int xen_set_ioreq_server_state(domid_t dom,
-                                             ioservid_t ioservid,
-                                             bool enable)
-{
-    return 0;
-}
-
-/* Xen 4.5 */
-#else
-
 static bool use_default_ioreq_server;
 
 static inline void xen_map_memory_section(domid_t dom,
@@ -624,6 +521,4 @@ static inline int xen_set_ioreq_server_state(domid_t dom,
                                                  enable);
 }
 
-#endif
-
 #endif /* QEMU_HW_XEN_NATIVE_H */
diff --git a/meson.build b/meson.build
index 553c8e0..0984237 100644
--- a/meson.build
+++ b/meson.build
@@ -1683,16 +1683,13 @@ if get_option('xen').enabled() or (get_option('xen').auto() and have_system)
     endif
   endif
   if not xen.found()
-    xen_tests = [ '4.11.0', '4.10.0', '4.9.0', '4.8.0', '4.7.1', '4.6.0', '4.5.0', '4.2.0' ]
+    xen_tests = [ '4.11.0', '4.10.0', '4.9.0', '4.8.0', '4.7.1' ]
     xen_libs = {
       '4.11.0': [ 'xenstore', 'xenctrl', 'xendevicemodel', 'xenforeignmemory', 'xengnttab', 'xenevtchn', 'xentoolcore' ],
       '4.10.0': [ 'xenstore', 'xenctrl', 'xendevicemodel', 'xenforeignmemory', 'xengnttab', 'xenevtchn', 'xentoolcore' ],
       '4.9.0': [ 'xenstore', 'xenctrl', 'xendevicemodel', 'xenforeignmemory', 'xengnttab', 'xenevtchn' ],
       '4.8.0': [ 'xenstore', 'xenctrl', 'xenforeignmemory', 'xengnttab', 'xenevtchn' ],
       '4.7.1': [ 'xenstore', 'xenctrl', 'xenforeignmemory', 'xengnttab', 'xenevtchn' ],
-      '4.6.0': [ 'xenstore', 'xenctrl' ],
-      '4.5.0': [ 'xenstore', 'xenctrl' ],
-      '4.2.0': [ 'xenstore', 'xenctrl' ],
     }
     xen_deps = {}
     foreach ver: xen_tests
diff --git a/scripts/xen-detect.c b/scripts/xen-detect.c
index 85e8206..db049e6 100644
--- a/scripts/xen-detect.c
+++ b/scripts/xen-detect.c
@@ -138,66 +138,6 @@
     return 0;
   }
 
-#elif CONFIG_XEN_CTRL_INTERFACE_VERSION == 40600
-  #include <xenctrl.h>
-  #include <xenstore.h>
-  #include <stdint.h>
-  #include <xen/hvm/hvm_info_table.h>
-  #if !defined(HVM_MAX_VCPUS)
-  # error HVM_MAX_VCPUS not defined
-  #endif
-  int main(void) {
-    xc_interface *xc;
-    xs_daemon_open();
-    xc = xc_interface_open(0, 0, 0);
-    xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-    xc_gnttab_open(NULL, 0);
-    xc_domain_add_to_physmap(0, 0, XENMAPSPACE_gmfn, 0, 0);
-    xc_hvm_inject_msi(xc, 0, 0xf0000000, 0x00000000);
-    xc_hvm_create_ioreq_server(xc, 0, HVM_IOREQSRV_BUFIOREQ_ATOMIC, NULL);
-    xc_reserved_device_memory_map(xc, 0, 0, 0, 0, NULL, 0);
-    return 0;
-  }
-
-#elif CONFIG_XEN_CTRL_INTERFACE_VERSION == 40500
-  #include <xenctrl.h>
-  #include <xenstore.h>
-  #include <stdint.h>
-  #include <xen/hvm/hvm_info_table.h>
-  #if !defined(HVM_MAX_VCPUS)
-  # error HVM_MAX_VCPUS not defined
-  #endif
-  int main(void) {
-    xc_interface *xc;
-    xs_daemon_open();
-    xc = xc_interface_open(0, 0, 0);
-    xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-    xc_gnttab_open(NULL, 0);
-    xc_domain_add_to_physmap(0, 0, XENMAPSPACE_gmfn, 0, 0);
-    xc_hvm_inject_msi(xc, 0, 0xf0000000, 0x00000000);
-    xc_hvm_create_ioreq_server(xc, 0, 0, NULL);
-    return 0;
-  }
-
-#elif CONFIG_XEN_CTRL_INTERFACE_VERSION == 40200
-  #include <xenctrl.h>
-  #include <xenstore.h>
-  #include <stdint.h>
-  #include <xen/hvm/hvm_info_table.h>
-  #if !defined(HVM_MAX_VCPUS)
-  # error HVM_MAX_VCPUS not defined
-  #endif
-  int main(void) {
-    xc_interface *xc;
-    xs_daemon_open();
-    xc = xc_interface_open(0, 0, 0);
-    xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-    xc_gnttab_open(NULL, 0);
-    xc_domain_add_to_physmap(0, 0, XENMAPSPACE_gmfn, 0, 0);
-    xc_hvm_inject_msi(xc, 0, 0xf0000000, 0x00000000);
-    return 0;
-  }
-
 #else
 #error invalid CONFIG_XEN_CTRL_INTERFACE_VERSION
 #endif
diff --git a/stubs/xen-hw-stub.c b/stubs/xen-hw-stub.c
index 34a22f2..7d7ffe8 100644
--- a/stubs/xen-hw-stub.c
+++ b/stubs/xen-hw-stub.c
@@ -15,7 +15,7 @@ int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
     return -1;
 }
 
-void xen_piix3_set_irq(void *opaque, int irq_num, int level)
+void xen_intx_set_irq(void *opaque, int irq_num, int level)
 {
 }