Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

- Many fixes from the floor as usual
- New "edu" device (v1->v2: fix 32-bit compilation)
- Disabling HLE and RTM on Haswell & Broadwell
- kvm_stat updates
- Added --enable-modules to Travis, in preparation for switching
  the default

# gpg: Signature made Mon 26 Jan 2015 11:44:40 GMT using RSA key ID 78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream:
  kvm_stat: Add RESET support for perf event ioctl
  target-i386: Disable HLE and RTM on Haswell & Broadwell
  sparse: Fix build with sparse on .S files
  exec: fix madvise of NULL pointer
  .travis.yml: Add "--enable-modules"
  apic: do not dereference pointer before it is checked for NULL
  kvm_stat: Print errno when syscall to perf_event_open() fails
  kvm_stat: Update exit reasons to the latest defintion
  kvm_stat: Add aarch64 support
  hw: misc, add educational driver
  vmstate: accept QEMUTimer in VMSTATE_TIMER*, add VMSTATE_TIMER_PTR*
  qemu-timer: introduce timer_deinit
  qemu-timer: add timer_init and timer_init_ns/us/ms
  target-i386: make xmm_regs 512-bit wide
  target-i386: use vmstate_offset_sub_array for AVX registers
  tests/multiboot: Add test for modules
  multiboot: Fix offset of bootloader name
  tests/multiboot: Update reference output
  pc: fix KVM features in pc-1.3 and earlier machine types

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

31 files changed, 461 insertions, 40 deletions

diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index ea991a3..43869d7 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -166,7 +166,7 @@ const VMStateDescription vmstate_ich9_pm = {
         VMSTATE_UINT16(acpi_regs.pm1.evt.sts, ICH9LPCPMRegs),
         VMSTATE_UINT16(acpi_regs.pm1.evt.en, ICH9LPCPMRegs),
         VMSTATE_UINT16(acpi_regs.pm1.cnt.cnt, ICH9LPCPMRegs),
-        VMSTATE_TIMER(acpi_regs.tmr.timer, ICH9LPCPMRegs),
+        VMSTATE_TIMER_PTR(acpi_regs.tmr.timer, ICH9LPCPMRegs),
         VMSTATE_INT64(acpi_regs.tmr.overflow_time, ICH9LPCPMRegs),
         VMSTATE_GPE_ARRAY(acpi_regs.gpe.sts, ICH9LPCPMRegs),
         VMSTATE_GPE_ARRAY(acpi_regs.gpe.en, ICH9LPCPMRegs),
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 481a16c..184e7e4 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -285,7 +285,7 @@ static const VMStateDescription vmstate_acpi = {
         VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
         VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
         VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
-        VMSTATE_TIMER(ar.tmr.timer, PIIX4PMState),
+        VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
         VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
         VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
         VMSTATE_STRUCT_TEST(
diff --git a/hw/arm/stellaris.c b/hw/arm/stellaris.c
index 64bd4b4..ccc3b18 100644
--- a/hw/arm/stellaris.c
+++ b/hw/arm/stellaris.c
@@ -306,7 +306,7 @@ static const VMStateDescription vmstate_stellaris_gptm = {
         VMSTATE_UINT32_ARRAY(match_prescale, gptm_state, 2),
         VMSTATE_UINT32(rtc, gptm_state),
         VMSTATE_INT64_ARRAY(tick, gptm_state, 2),
-        VMSTATE_TIMER_ARRAY(timer, gptm_state, 2),
+        VMSTATE_TIMER_PTR_ARRAY(timer, gptm_state, 2),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index 739a03e..2bf87c9 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -791,7 +791,7 @@ static const VMStateDescription vmstate_fdc_result_timer = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_TIMER(result_timer, FDCtrl),
+        VMSTATE_TIMER_PTR(result_timer, FDCtrl),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
index a5736cb..7044b35 100644
--- a/hw/char/cadence_uart.c
+++ b/hw/char/cadence_uart.c
@@ -520,7 +520,7 @@ static const VMStateDescription vmstate_cadence_uart = {
         VMSTATE_UINT32(rx_count, UartState),
         VMSTATE_UINT32(tx_count, UartState),
         VMSTATE_UINT32(rx_wpos, UartState),
-        VMSTATE_TIMER(fifo_trigger_handle, UartState),
+        VMSTATE_TIMER_PTR(fifo_trigger_handle, UartState),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/char/serial.c b/hw/char/serial.c
index 3aca874..bd25c03 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -730,7 +730,7 @@ const VMStateDescription vmstate_serial_fifo_timeout_timer = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_TIMER(fifo_timeout_timer, SerialState),
+        VMSTATE_TIMER_PTR(fifo_timeout_timer, SerialState),
         VMSTATE_END_OF_LIST()
     }
 };
@@ -763,7 +763,7 @@ const VMStateDescription vmstate_serial_poll = {
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_INT32(poll_msl, SerialState),
-        VMSTATE_TIMER(modem_status_poll, SerialState),
+        VMSTATE_TIMER_PTR(modem_status_poll, SerialState),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c
index 466e543..2abad1f 100644
--- a/hw/core/ptimer.c
+++ b/hw/core/ptimer.c
@@ -214,7 +214,7 @@ const VMStateDescription vmstate_ptimer = {
         VMSTATE_INT64(period, ptimer_state),
         VMSTATE_INT64(last_event, ptimer_state),
         VMSTATE_INT64(next_event, ptimer_state),
-        VMSTATE_TIMER(timer, ptimer_state),
+        VMSTATE_TIMER_PTR(timer, ptimer_state),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/dma/pl330.c b/hw/dma/pl330.c
index 6b6eaae..16cf77e 100644
--- a/hw/dma/pl330.c
+++ b/hw/dma/pl330.c
@@ -286,7 +286,7 @@ static const VMStateDescription vmstate_pl330 = {
                        PL330Queue),
         VMSTATE_STRUCT(write_queue, PL330State, 0, vmstate_pl330_queue,
                        PL330Queue),
-        VMSTATE_TIMER(timer, PL330State),
+        VMSTATE_TIMER_PTR(timer, PL330State),
         VMSTATE_UINT32(inten, PL330State),
         VMSTATE_UINT32(int_status, PL330State),
         VMSTATE_UINT32(ev_status, PL330State),
diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index f86d351..1adbe9e 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -156,6 +156,7 @@ int load_multiboot(FWCfgState *fw_cfg,
     MultibootState mbs;
     uint8_t bootinfo[MBI_SIZE];
     uint8_t *mb_bootinfo_data;
+    uint32_t cmdline_len;
 
     /* Ok, let's see if it is a multiboot image.
        The header is 12x32bit long, so the latest entry may be 8192 - 48. */
@@ -258,27 +259,28 @@ int load_multiboot(FWCfgState *fw_cfg,
     mbs.offset_mbinfo = mbs.mb_buf_size;
 
     /* Calculate space for cmdlines, bootloader name, and mb_mods */
-    mbs.mb_buf_size += strlen(kernel_filename) + 1;
-    mbs.mb_buf_size += strlen(kernel_cmdline) + 1;
-    mbs.mb_buf_size += strlen(bootloader_name) + 1;
+    cmdline_len = strlen(kernel_filename) + 1;
+    cmdline_len += strlen(kernel_cmdline) + 1;
     if (initrd_filename) {
         const char *r = initrd_filename;
-        mbs.mb_buf_size += strlen(r) + 1;
+        cmdline_len += strlen(r) + 1;
         mbs.mb_mods_avail = 1;
         while (*(r = get_opt_value(NULL, 0, r))) {
            mbs.mb_mods_avail++;
            r++;
         }
-        mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
     }
 
+    mbs.mb_buf_size += cmdline_len;
+    mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
+    mbs.mb_buf_size += strlen(bootloader_name) + 1;
+
     mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
 
     /* enlarge mb_buf to hold cmdlines, bootloader, mb-info structs */
     mbs.mb_buf            = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
     mbs.offset_cmdlines   = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
-    mbs.offset_bootloader = mbs.offset_cmdlines + strlen(kernel_filename) + 1 
-                            + strlen(kernel_cmdline) + 1;
+    mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
 
     if (initrd_filename) {
         char *next_initrd, not_last;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f0a3201..38b42b0 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -328,6 +328,10 @@ static void pc_compat_2_2(MachineState *machine)
     x86_cpu_compat_set_features("Haswell", FEAT_1_ECX, 0, CPUID_EXT_RDRAND);
     x86_cpu_compat_set_features("Broadwell", FEAT_1_ECX, 0, CPUID_EXT_F16C);
     x86_cpu_compat_set_features("Broadwell", FEAT_1_ECX, 0, CPUID_EXT_RDRAND);
+    x86_cpu_compat_set_features("Haswell", FEAT_7_0_EBX,
+                                CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
+    x86_cpu_compat_set_features("Broadwell", FEAT_7_0_EBX,
+                                CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
 }
 
 static void pc_compat_2_1(MachineState *machine)
@@ -406,7 +410,7 @@ static void pc_compat_1_3(MachineState *machine)
 static void pc_compat_1_2(MachineState *machine)
 {
     pc_compat_1_3(machine);
-    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, KVM_FEATURE_PV_EOI);
+    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, 1 << KVM_FEATURE_PV_EOI);
 }
 
 static void pc_init_pci_2_2(MachineState *machine)
@@ -483,7 +487,7 @@ static void pc_init_isa(MachineState *machine)
     if (!machine->cpu_model) {
         machine->cpu_model = "486";
     }
-    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, KVM_FEATURE_PV_EOI);
+    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, 1 << KVM_FEATURE_PV_EOI);
     enable_compat_apic_id_mode();
     pc_init1(machine, 0, 1);
 }
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index a432944..63027ee 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -307,6 +307,10 @@ static void pc_compat_2_2(MachineState *machine)
     x86_cpu_compat_set_features("Haswell", FEAT_1_ECX, 0, CPUID_EXT_RDRAND);
     x86_cpu_compat_set_features("Broadwell", FEAT_1_ECX, 0, CPUID_EXT_F16C);
     x86_cpu_compat_set_features("Broadwell", FEAT_1_ECX, 0, CPUID_EXT_RDRAND);
+    x86_cpu_compat_set_features("Haswell", FEAT_7_0_EBX,
+                                CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
+    x86_cpu_compat_set_features("Broadwell", FEAT_7_0_EBX,
+                                CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
 }
 
 static void pc_compat_2_1(MachineState *machine)
diff --git a/hw/input/lm832x.c b/hw/input/lm832x.c
index 9eb68e8..530a6e0 100644
--- a/hw/input/lm832x.c
+++ b/hw/input/lm832x.c
@@ -455,7 +455,7 @@ static const VMStateDescription vmstate_lm_kbd = {
         VMSTATE_UINT16_ARRAY(pwm.file, LM823KbdState, 256),
         VMSTATE_UINT8(pwm.faddr, LM823KbdState),
         VMSTATE_BUFFER(pwm.addr, LM823KbdState),
-        VMSTATE_TIMER_ARRAY(pwm.tm, LM823KbdState, 3),
+        VMSTATE_TIMER_PTR_ARRAY(pwm.tm, LM823KbdState, 3),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index d9bb188..0858b45 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -177,13 +177,14 @@ bool apic_next_timer(APICCommonState *s, int64_t current_time)
 
 void apic_init_reset(DeviceState *dev)
 {
-    APICCommonState *s = APIC_COMMON(dev);
-    APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
+    APICCommonState *s;
+    APICCommonClass *info;
     int i;
 
-    if (!s) {
+    if (!dev) {
         return;
     }
+    s = APIC_COMMON(dev);
     s->tpr = 0;
     s->spurious_vec = 0xff;
     s->log_dest = 0;
@@ -208,6 +209,7 @@ void apic_init_reset(DeviceState *dev)
     }
     s->timer_expiry = -1;
 
+    info = APIC_COMMON_GET_CLASS(s);
     if (info->reset) {
         info->reset(s);
     }
diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index d0543d4..6ff6c7f 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -450,7 +450,7 @@ static const VMStateDescription vmstate_nvic = {
         VMSTATE_UINT32(systick.control, nvic_state),
         VMSTATE_UINT32(systick.reload, nvic_state),
         VMSTATE_INT64(systick.tick, nvic_state),
-        VMSTATE_TIMER(systick.timer, nvic_state),
+        VMSTATE_TIMER_PTR(systick.timer, nvic_state),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 2f53bf8..17510ce 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -234,7 +234,7 @@ static const VMStateDescription vmstate_acpi = {
         VMSTATE_UINT16(ar.pm1.evt.en, VT686PMState),
         VMSTATE_UINT16(ar.pm1.cnt.cnt, VT686PMState),
         VMSTATE_STRUCT(apm, VT686PMState, 0, vmstate_apm, APMState),
-        VMSTATE_TIMER(ar.tmr.timer, VT686PMState),
+        VMSTATE_TIMER_PTR(ar.tmr.timer, VT686PMState),
         VMSTATE_INT64(ar.tmr.overflow_time, VT686PMState),
         VMSTATE_END_OF_LIST()
     }
diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index e47fea8..029a56f 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -40,3 +40,4 @@ obj-$(CONFIG_SLAVIO) += slavio_misc.o
 obj-$(CONFIG_ZYNQ) += zynq_slcr.o
 
 obj-$(CONFIG_PVPANIC) += pvpanic.o
+obj-$(CONFIG_EDU) += edu.o
diff --git a/hw/misc/edu.c b/hw/misc/edu.c
new file mode 100644
index 0000000..f601069
--- /dev/null
+++ b/hw/misc/edu.c
@@ -0,0 +1,408 @@
+/*
+ * QEMU educational PCI device
+ *
+ * Copyright (c) 2012-2015 Jiri Slaby
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "hw/pci/pci.h"
+#include "qemu/timer.h"
+#include "qemu/main-loop.h" /* iothread mutex */
+#include "qapi/visitor.h"
+
+#define EDU(obj)        OBJECT_CHECK(EduState, obj, "edu")
+
+#define FACT_IRQ        0x00000001
+#define DMA_IRQ         0x00000100
+
+#define DMA_START       0x40000
+#define DMA_SIZE        4096
+
+typedef struct {
+    PCIDevice pdev;
+    MemoryRegion mmio;
+
+    QemuThread thread;
+    QemuMutex thr_mutex;
+    QemuCond thr_cond;
+    bool stopping;
+
+    uint32_t addr4;
+    uint32_t fact;
+#define EDU_STATUS_COMPUTING    0x01
+#define EDU_STATUS_IRQFACT      0x80
+    uint32_t status;
+
+    uint32_t irq_status;
+
+#define EDU_DMA_RUN             0x1
+#define EDU_DMA_DIR(cmd)        (((cmd) & 0x2) >> 1)
+# define EDU_DMA_FROM_PCI       0
+# define EDU_DMA_TO_PCI         1
+#define EDU_DMA_IRQ             0x4
+    struct dma_state {
+        dma_addr_t src;
+        dma_addr_t dst;
+        dma_addr_t cnt;
+        dma_addr_t cmd;
+    } dma;
+    QEMUTimer dma_timer;
+    char dma_buf[DMA_SIZE];
+    uint64_t dma_mask;
+} EduState;
+
+static void edu_raise_irq(EduState *edu, uint32_t val)
+{
+    edu->irq_status |= val;
+    if (edu->irq_status) {
+        pci_set_irq(&edu->pdev, 1);
+    }
+}
+
+static void edu_lower_irq(EduState *edu, uint32_t val)
+{
+    edu->irq_status &= ~val;
+
+    if (!edu->irq_status) {
+        pci_set_irq(&edu->pdev, 0);
+    }
+}
+
+static bool within(uint32_t addr, uint32_t start, uint32_t end)
+{
+    return start <= addr && addr < end;
+}
+
+static void edu_check_range(uint32_t addr, uint32_t size1, uint32_t start,
+                uint32_t size2)
+{
+    uint32_t end1 = addr + size1;
+    uint32_t end2 = start + size2;
+
+    if (within(addr, start, end2) &&
+            end1 > addr && within(end1, start, end2)) {
+        return;
+    }
+
+    hw_error("EDU: DMA range 0x%.8x-0x%.8x out of bounds (0x%.8x-0x%.8x)!",
+            addr, end1 - 1, start, end2 - 1);
+}
+
+static dma_addr_t edu_clamp_addr(const EduState *edu, dma_addr_t addr)
+{
+    dma_addr_t res = addr & edu->dma_mask;
+
+    if (addr != res) {
+        printf("EDU: clamping DMA %#.16"PRIx64" to %#.16"PRIx64"!\n", addr, res);
+    }
+
+    return res;
+}
+
+static void edu_dma_timer(void *opaque)
+{
+    EduState *edu = opaque;
+    bool raise_irq = false;
+
+    if (!(edu->dma.cmd & EDU_DMA_RUN)) {
+        return;
+    }
+
+    if (EDU_DMA_DIR(edu->dma.cmd) == EDU_DMA_FROM_PCI) {
+        uint32_t dst = edu->dma.dst;
+        edu_check_range(dst, edu->dma.cnt, DMA_START, DMA_SIZE);
+        dst -= DMA_START;
+        pci_dma_read(&edu->pdev, edu_clamp_addr(edu, edu->dma.src),
+                edu->dma_buf + dst, edu->dma.cnt);
+    } else {
+        uint32_t src = edu->dma.src;
+        edu_check_range(src, edu->dma.cnt, DMA_START, DMA_SIZE);
+        src -= DMA_START;
+        pci_dma_write(&edu->pdev, edu_clamp_addr(edu, edu->dma.dst),
+                edu->dma_buf + src, edu->dma.cnt);
+    }
+
+    edu->dma.cmd &= ~EDU_DMA_RUN;
+    if (edu->dma.cmd & EDU_DMA_IRQ) {
+        raise_irq = true;
+    }
+
+    if (raise_irq) {
+        edu_raise_irq(edu, DMA_IRQ);
+    }
+}
+
+static void dma_rw(EduState *edu, bool write, dma_addr_t *val, dma_addr_t *dma,
+                bool timer)
+{
+    if (write && (edu->dma.cmd & EDU_DMA_RUN)) {
+        return;
+    }
+
+    if (write) {
+        *dma = *val;
+    } else {
+        *val = *dma;
+    }
+
+    if (timer) {
+        timer_mod(&edu->dma_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 100);
+    }
+}
+
+static uint64_t edu_mmio_read(void *opaque, hwaddr addr, unsigned size)
+{
+    EduState *edu = opaque;
+    uint64_t val = ~0ULL;
+
+    if (size != 4) {
+        return val;
+    }
+
+    switch (addr) {
+    case 0x00:
+        val = 0x010000edu;
+        break;
+    case 0x04:
+        val = edu->addr4;
+        break;
+    case 0x08:
+        qemu_mutex_lock(&edu->thr_mutex);
+        val = edu->fact;
+        qemu_mutex_unlock(&edu->thr_mutex);
+        break;
+    case 0x20:
+        val = atomic_read(&edu->status);
+        break;
+    case 0x24:
+        val = edu->irq_status;
+        break;
+    case 0x80:
+        dma_rw(edu, false, &val, &edu->dma.src, false);
+        break;
+    case 0x88:
+        dma_rw(edu, false, &val, &edu->dma.dst, false);
+        break;
+    case 0x90:
+        dma_rw(edu, false, &val, &edu->dma.cnt, false);
+        break;
+    case 0x98:
+        dma_rw(edu, false, &val, &edu->dma.cmd, false);
+        break;
+    }
+
+    return val;
+}
+
+static void edu_mmio_write(void *opaque, hwaddr addr, uint64_t val,
+                unsigned size)
+{
+    EduState *edu = opaque;
+
+    if (addr < 0x80 && size != 4) {
+        return;
+    }
+
+    if (addr >= 0x80 && size != 4 && size != 8) {
+        return;
+    }
+
+    switch (addr) {
+    case 0x04:
+        edu->addr4 = ~val;
+        break;
+    case 0x08:
+        if (atomic_read(&edu->status) & EDU_STATUS_COMPUTING) {
+            break;
+        }
+        /* EDU_STATUS_COMPUTING cannot go 0->1 concurrently, because it is only
+         * set in this function and it is under the iothread mutex.
+         */
+        qemu_mutex_lock(&edu->thr_mutex);
+        edu->fact = val;
+        atomic_or(&edu->status, EDU_STATUS_COMPUTING);
+        qemu_cond_signal(&edu->thr_cond);
+        qemu_mutex_unlock(&edu->thr_mutex);
+        break;
+    case 0x20:
+        if (val & EDU_STATUS_IRQFACT) {
+            atomic_or(&edu->status, EDU_STATUS_IRQFACT);
+        } else {
+            atomic_and(&edu->status, ~EDU_STATUS_IRQFACT);
+        }
+        break;
+    case 0x60:
+        edu_raise_irq(edu, val);
+        break;
+    case 0x64:
+        edu_lower_irq(edu, val);
+        break;
+    case 0x80:
+        dma_rw(edu, true, &val, &edu->dma.src, false);
+        break;
+    case 0x88:
+        dma_rw(edu, true, &val, &edu->dma.dst, false);
+        break;
+    case 0x90:
+        dma_rw(edu, true, &val, &edu->dma.cnt, false);
+        break;
+    case 0x98:
+        if (!(val & EDU_DMA_RUN)) {
+            break;
+        }
+        dma_rw(edu, true, &val, &edu->dma.cmd, true);
+        break;
+    }
+}
+
+static const MemoryRegionOps edu_mmio_ops = {
+    .read = edu_mmio_read,
+    .write = edu_mmio_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+/*
+ * We purposedly use a thread, so that users are forced to wait for the status
+ * register.
+ */
+static void *edu_fact_thread(void *opaque)
+{
+    EduState *edu = opaque;
+
+    while (1) {
+        uint32_t val, ret = 1;
+
+        qemu_mutex_lock(&edu->thr_mutex);
+        while ((atomic_read(&edu->status) & EDU_STATUS_COMPUTING) == 0 &&
+                        !edu->stopping) {
+            qemu_cond_wait(&edu->thr_cond, &edu->thr_mutex);
+        }
+
+        if (edu->stopping) {
+            qemu_mutex_unlock(&edu->thr_mutex);
+            break;
+        }
+
+        val = edu->fact;
+        qemu_mutex_unlock(&edu->thr_mutex);
+
+        while (val > 0) {
+            ret *= val--;
+        }
+
+        /*
+         * We should sleep for a random period here, so that students are
+         * forced to check the status properly.
+         */
+
+        qemu_mutex_lock(&edu->thr_mutex);
+        edu->fact = ret;
+        qemu_mutex_unlock(&edu->thr_mutex);
+        atomic_and(&edu->status, ~EDU_STATUS_COMPUTING);
+
+        if (atomic_read(&edu->status) & EDU_STATUS_IRQFACT) {
+            qemu_mutex_lock_iothread();
+            edu_raise_irq(edu, FACT_IRQ);
+            qemu_mutex_unlock_iothread();
+        }
+    }
+
+    return NULL;
+}
+
+static int pci_edu_init(PCIDevice *pdev)
+{
+    EduState *edu = DO_UPCAST(EduState, pdev, pdev);
+    uint8_t *pci_conf = pdev->config;
+
+    timer_init_ms(&edu->dma_timer, QEMU_CLOCK_VIRTUAL, edu_dma_timer, edu);
+
+    qemu_mutex_init(&edu->thr_mutex);
+    qemu_cond_init(&edu->thr_cond);
+    qemu_thread_create(&edu->thread, "edu", edu_fact_thread,
+                       edu, QEMU_THREAD_JOINABLE);
+
+    pci_config_set_interrupt_pin(pci_conf, 1);
+
+    memory_region_init_io(&edu->mmio, OBJECT(edu), &edu_mmio_ops, edu,
+                    "edu-mmio", 1 << 20);
+    pci_register_bar(pdev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &edu->mmio);
+
+    return 0;
+}
+
+static void pci_edu_uninit(PCIDevice *pdev)
+{
+    EduState *edu = DO_UPCAST(EduState, pdev, pdev);
+
+    qemu_mutex_lock(&edu->thr_mutex);
+    edu->stopping = true;
+    qemu_mutex_unlock(&edu->thr_mutex);
+    qemu_cond_signal(&edu->thr_cond);
+    qemu_thread_join(&edu->thread);
+
+    qemu_cond_destroy(&edu->thr_cond);
+    qemu_mutex_destroy(&edu->thr_mutex);
+
+    timer_del(&edu->dma_timer);
+}
+
+static void edu_obj_uint64(Object *obj, struct Visitor *v, void *opaque,
+                const char *name, Error **errp)
+{
+    uint64_t *val = opaque;
+
+    visit_type_uint64(v, val, name, errp);
+}
+
+static void edu_instance_init(Object *obj)
+{
+    EduState *edu = EDU(obj);
+
+    edu->dma_mask = (1UL << 28) - 1;
+    object_property_add(obj, "dma_mask", "uint64", edu_obj_uint64,
+                    edu_obj_uint64, NULL, &edu->dma_mask, NULL);
+}
+
+static void edu_class_init(ObjectClass *class, void *data)
+{
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(class);
+
+    k->init = pci_edu_init;
+    k->exit = pci_edu_uninit;
+    k->vendor_id = PCI_VENDOR_ID_QEMU;
+    k->device_id = 0x11e8;
+    k->revision = 0x10;
+    k->class_id = PCI_CLASS_OTHERS;
+}
+
+static void pci_edu_register_types(void)
+{
+    static const TypeInfo edu_info = {
+        .name          = "edu",
+        .parent        = TYPE_PCI_DEVICE,
+        .instance_size = sizeof(EduState),
+        .instance_init = edu_instance_init,
+        .class_init    = edu_class_init,
+    };
+
+    type_register_static(&edu_info);
+}
+type_init(pci_edu_register_types)
diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
index b4273aa..47d9771 100644
--- a/hw/misc/macio/cuda.c
+++ b/hw/misc/macio/cuda.c
@@ -631,7 +631,7 @@ static const VMStateDescription vmstate_cuda_timer = {
         VMSTATE_UINT16(counter_value, CUDATimer),
         VMSTATE_INT64(load_time, CUDATimer),
         VMSTATE_INT64(next_irq_time, CUDATimer),
-        VMSTATE_TIMER_TEST(timer, CUDATimer, cuda_timer_exist),
+        VMSTATE_TIMER_PTR_TEST(timer, CUDATimer, cuda_timer_exist),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 8a1c8f1..8486b80 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -1719,7 +1719,7 @@ const VMStateDescription vmstate_pcnet = {
         VMSTATE_BUFFER(buffer, PCNetState),
         VMSTATE_UNUSED_TEST(is_version_2, 4),
         VMSTATE_INT32(tx_busy, PCNetState),
-        VMSTATE_TIMER(poll_timer, PCNetState),
+        VMSTATE_TIMER_PTR(poll_timer, PCNetState),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 15064d3..10e5355 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1205,8 +1205,8 @@ const VMStateDescription sdhci_vmstate = {
         VMSTATE_UINT64(admasysaddr, SDHCIState),
         VMSTATE_UINT8(stopped_state, SDHCIState),
         VMSTATE_VBUFFER_UINT32(fifo_buffer, SDHCIState, 1, NULL, 0, buf_maxsz),
-        VMSTATE_TIMER(insert_timer, SDHCIState),
-        VMSTATE_TIMER(transfer_timer, SDHCIState),
+        VMSTATE_TIMER_PTR(insert_timer, SDHCIState),
+        VMSTATE_TIMER_PTR(transfer_timer, SDHCIState),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/timer/a9gtimer.c b/hw/timer/a9gtimer.c
index a0656d5..435142a 100644
--- a/hw/timer/a9gtimer.c
+++ b/hw/timer/a9gtimer.c
@@ -328,7 +328,7 @@ static const VMStateDescription vmstate_a9_gtimer = {
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_TIMER(timer, A9GTimerState),
+        VMSTATE_TIMER_PTR(timer, A9GTimerState),
         VMSTATE_UINT64(counter, A9GTimerState),
         VMSTATE_UINT64(ref_counter, A9GTimerState),
         VMSTATE_UINT64(cpu_ref_time, A9GTimerState),
diff --git a/hw/timer/arm_mptimer.c b/hw/timer/arm_mptimer.c
index 35a0a23..8b93b3c 100644
--- a/hw/timer/arm_mptimer.c
+++ b/hw/timer/arm_mptimer.c
@@ -246,7 +246,7 @@ static const VMStateDescription vmstate_timerblock = {
         VMSTATE_UINT32(control, TimerBlock),
         VMSTATE_UINT32(status, TimerBlock),
         VMSTATE_INT64(tick, TimerBlock),
-        VMSTATE_TIMER(timer, TimerBlock),
+        VMSTATE_TIMER_PTR(timer, TimerBlock),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index d8bc231..78d86be 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -299,7 +299,7 @@ static const VMStateDescription vmstate_hpet_timer = {
         VMSTATE_UINT64(fsb, HPETTimer),
         VMSTATE_UINT64(period, HPETTimer),
         VMSTATE_UINT8(wrap_flag, HPETTimer),
-        VMSTATE_TIMER(qemu_timer, HPETTimer),
+        VMSTATE_TIMER_PTR(qemu_timer, HPETTimer),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index f18d128..5a107fa 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -758,7 +758,7 @@ static const VMStateDescription vmstate_rtc = {
         VMSTATE_BUFFER(cmos_data, RTCState),
         VMSTATE_UINT8(cmos_index, RTCState),
         VMSTATE_UNUSED(7*4),
-        VMSTATE_TIMER(periodic_timer, RTCState),
+        VMSTATE_TIMER_PTR(periodic_timer, RTCState),
         VMSTATE_INT64(next_periodic_time, RTCState),
         VMSTATE_UNUSED(3*8),
         VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
@@ -766,7 +766,7 @@ static const VMStateDescription vmstate_rtc = {
         VMSTATE_UINT64_V(base_rtc, RTCState, 3),
         VMSTATE_UINT64_V(last_update, RTCState, 3),
         VMSTATE_INT64_V(offset, RTCState, 3),
-        VMSTATE_TIMER_V(update_timer, RTCState, 3),
+        VMSTATE_TIMER_PTR_V(update_timer, RTCState, 3),
         VMSTATE_UINT64_V(next_alarm_time, RTCState, 3),
         VMSTATE_END_OF_LIST()
     },
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 1cc0fc1..ccf54b6 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -2437,7 +2437,7 @@ const VMStateDescription vmstate_ehci = {
         VMSTATE_UINT32(portsc[4], EHCIState),
         VMSTATE_UINT32(portsc[5], EHCIState),
         /* frame timer */
-        VMSTATE_TIMER(frame_timer, EHCIState),
+        VMSTATE_TIMER_PTR(frame_timer, EHCIState),
         VMSTATE_UINT64(last_run_ns, EHCIState),
         VMSTATE_UINT32(async_stepdown, EHCIState),
         /* schedule state */
diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
index 9a84eb6..a0d478e 100644
--- a/hw/usb/hcd-ohci.c
+++ b/hw/usb/hcd-ohci.c
@@ -2015,7 +2015,7 @@ static const VMStateDescription vmstate_ohci_eof_timer = {
     .minimum_version_id = 1,
     .pre_load = ohci_eof_timer_pre_load,
     .fields = (VMStateField[]) {
-        VMSTATE_TIMER(eof_timer, OHCIState),
+        VMSTATE_TIMER_PTR(eof_timer, OHCIState),
         VMSTATE_END_OF_LIST()
     },
 };
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index 4a4215d..f903de7 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -419,7 +419,7 @@ static const VMStateDescription vmstate_uhci = {
         VMSTATE_UINT32(fl_base_addr, UHCIState),
         VMSTATE_UINT8(sof_timing, UHCIState),
         VMSTATE_UINT8(status2, UHCIState),
-        VMSTATE_TIMER(frame_timer, UHCIState),
+        VMSTATE_TIMER_PTR(frame_timer, UHCIState),
         VMSTATE_INT64_V(expire_time, UHCIState, 2),
         VMSTATE_UINT32_V(pending_int_mask, UHCIState, 3),
         VMSTATE_END_OF_LIST()
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 9a942cf..776699b 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3855,7 +3855,7 @@ static const VMStateDescription vmstate_xhci = {
 
         /* Runtime Registers & state */
         VMSTATE_INT64(mfindex_start,  XHCIState),
-        VMSTATE_TIMER(mfwrap_timer,   XHCIState),
+        VMSTATE_TIMER_PTR(mfwrap_timer,   XHCIState),
         VMSTATE_STRUCT(cmd_ring, XHCIState, 1, vmstate_xhci_ring, XHCIRing),
 
         VMSTATE_END_OF_LIST()
diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 9fbd59e..962d3f5 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -2438,7 +2438,7 @@ static const VMStateDescription usbredir_vmstate = {
     .post_load = usbredir_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_USB_DEVICE(dev, USBRedirDevice),
-        VMSTATE_TIMER(attach_timer, USBRedirDevice),
+        VMSTATE_TIMER_PTR(attach_timer, USBRedirDevice),
         {
             .name         = "parser",
             .version_id   = 0,
diff --git a/hw/watchdog/wdt_i6300esb.c b/hw/watchdog/wdt_i6300esb.c
index 687c8b1..33dd6d4 100644
--- a/hw/watchdog/wdt_i6300esb.c
+++ b/hw/watchdog/wdt_i6300esb.c
@@ -398,7 +398,7 @@ static const VMStateDescription vmstate_i6300esb = {
         VMSTATE_INT32(free_run, I6300State),
         VMSTATE_INT32(locked, I6300State),
         VMSTATE_INT32(enabled, I6300State),
-        VMSTATE_TIMER(timer, I6300State),
+        VMSTATE_TIMER_PTR(timer, I6300State),
         VMSTATE_UINT32(timer1_preload, I6300State),
         VMSTATE_UINT32(timer2_preload, I6300State),
         VMSTATE_INT32(stage, I6300State),
diff --git a/hw/watchdog/wdt_ib700.c b/hw/watchdog/wdt_ib700.c
index 8cb9827..0917a71 100644
--- a/hw/watchdog/wdt_ib700.c
+++ b/hw/watchdog/wdt_ib700.c
@@ -93,7 +93,7 @@ static const VMStateDescription vmstate_ib700 = {
     .version_id = 0,
     .minimum_version_id = 0,
     .fields = (VMStateField[]) {
-        VMSTATE_TIMER(timer, IB700State),
+        VMSTATE_TIMER_PTR(timer, IB700State),
         VMSTATE_END_OF_LIST()
     }
 };