Patchwork [1/2] hw: add isa-debug-exit device v4

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Submitter Lucas Meneghel Rodrigues
Date Dec. 13, 2012, 5:10 p.m.
Message ID <1355418627-7105-2-git-send-email-lmr@redhat.com>
Download mbox | patch
Permalink /patch/206180/
State New
Headers show

Comments

Lucas Meneghel Rodrigues - Dec. 13, 2012, 5:10 p.m.
From: Gerd Hoffmann <kraxel@redhat.com>

When present it makes qemu exit on any write.
Mapped to port 0x501 by default.

Without this patch Anthony doesn't allow me to
remove the bochs bios debug ports because his
test suite uses this.

Changes from v3:
 * Added a short description
 * Added a copyright notice
 * Added Signed-off-by line to the commit
   message
 * Made the GPL license header to say
   'or any later version', to simplify
   things and be more in line with other
   qemu source files
 * Turned TypeInfo into static const

Changes from v2:
 * Fixed rebase mistake

Changes from v1:
 * Add access_size property to the device,
   needed for kvm-unit-tests.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
---
 hw/debugexit.c        |   87 +++++++++++++++++++++++++++
 hw/i386/Makefile.objs |    2 +-
 hw/pc-testdev.c       |  156 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 244 insertions(+), 1 deletion(-)
 create mode 100644 hw/debugexit.c
 create mode 100644 hw/pc-testdev.c

Patch

diff --git a/hw/debugexit.c b/hw/debugexit.c
new file mode 100644
index 0000000..b90983b
--- /dev/null
+++ b/hw/debugexit.c
@@ -0,0 +1,87 @@ 
+/*
+ * QEMU debug exit port ("LGPL'ed-VGA-BIOS-style port 501/502") emulation
+ *
+ * Copyright (c) 2012 Gerd Hoffmann
+ *
+ * (Based on previous work from Herve Poussineau)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw.h"
+#include "isa.h"
+
+#define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit"
+#define ISA_DEBUG_EXIT_DEVICE(obj) \
+     OBJECT_CHECK(ISADebugExitState, (obj), TYPE_ISA_DEBUG_EXIT_DEVICE)
+
+typedef struct ISADebugExitState {
+    ISADevice parent_obj;
+
+    uint32_t iobase;
+    uint8_t access_size;
+    MemoryRegion io;
+} ISADebugExitState;
+
+static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
+                             unsigned width)
+{
+    exit((val << 1) | 1);
+}
+
+static const MemoryRegionOps debug_exit_ops = {
+    .write = debug_exit_write,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 1,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static int debug_exit_initfn(ISADevice *dev)
+{
+    ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(dev);
+
+    memory_region_init_io(&isa->io, &debug_exit_ops, isa,
+                          TYPE_ISA_DEBUG_EXIT_DEVICE, isa->access_size);
+    memory_region_add_subregion(isa_address_space_io(dev),
+                                isa->iobase, &isa->io);
+    return 0;
+}
+
+static Property debug_exit_properties[] = {
+    DEFINE_PROP_HEX32("iobase", ISADebugExitState, iobase, 0x501),
+    DEFINE_PROP_UINT8("access-size", ISADebugExitState, access_size, 1),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void debug_exit_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
+    ic->init = debug_exit_initfn;
+    dc->props = debug_exit_properties;
+}
+
+static const TypeInfo debug_exit_info = {
+    .name          = TYPE_ISA_DEBUG_EXIT_DEVICE,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(ISADebugExitState),
+    .class_init    = debug_exit_class_initfn,
+};
+
+static void debug_exit_register_types(void)
+{
+    type_register_static(&debug_exit_info);
+}
+
+type_init(debug_exit_register_types)
diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index 0d3f6a8..56aaa9d 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -3,7 +3,7 @@  obj-y += apic_common.o apic.o kvmvapic.o
 obj-y += sga.o ioapic_common.o ioapic.o piix_pci.o
 obj-y += vmport.o
 obj-y += pci-hotplug.o smbios.o wdt_ib700.o
-obj-y += debugcon.o multiboot.o
+obj-y += debugcon.o debugexit.o multiboot.o
 obj-y += pc_piix.o
 obj-y += pc_sysfw.o
 obj-y += lpc_ich9.o q35.o pc_q35.o
diff --git a/hw/pc-testdev.c b/hw/pc-testdev.c
new file mode 100644
index 0000000..06cf872
--- /dev/null
+++ b/hw/pc-testdev.c
@@ -0,0 +1,156 @@ 
+/*
+ * QEMU x86 ISA testdev
+ *
+ * Copyright (c) 2012 Avi Kivity, Gerd Hoffmann, Marcelo Tosatti
+ *
+ * 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.
+ */
+
+/*
+ * This device is used to test KVM features specific to the x86 port, such
+ * as emulation, power management, interrupt routing, among others. It's meant
+ * to be used like:
+ *
+ * qemu-system-x86_64 -device pc-testdev -serial stdio \
+ * -device isa-debugexit,iobase=0xf4,access-size=2 \
+ * -kernel /home/lmr/Code/virt-test.git/kvm/unittests/msr.flat
+ *
+ * Where msr.flat is one of the KVM unittests, present on a separate repo,
+ * git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
+ */
+
+#include <sys/mman.h>
+#include "hw.h"
+#include "qdev.h"
+#include "isa.h"
+#include "exec-memory.h"
+
+#define IOMEM_LEN    0x10000
+
+typedef struct PCTestdev {
+    ISADevice dev;
+    MemoryRegion iomem;
+    uint32_t ioport_data;
+    char iomem_buf[IOMEM_LEN];
+} PCTestdev;
+
+#define TYPE_TESTDEV "pc-testdev"
+#define TESTDEV(obj) \
+     OBJECT_CHECK(struct PCTestdev, (obj), TYPE_TESTDEV)
+
+static void test_device_irq_line(void *opaque, uint32_t addr, uint32_t data)
+{
+    struct PCTestdev *dev = opaque;
+    qemu_set_irq(isa_get_irq(&dev->dev, addr - 0x2000), !!data);
+}
+
+static void test_device_ioport_write(void *opaque, uint32_t addr, uint32_t data)
+{
+    struct PCTestdev *dev = opaque;
+    dev->ioport_data = data;
+}
+
+static uint32_t test_device_ioport_read(void *opaque, uint32_t addr)
+{
+    struct PCTestdev *dev = opaque;
+    return dev->ioport_data;
+}
+
+static void test_device_flush_page(void *opaque, uint32_t addr, uint32_t data)
+{
+    hwaddr len = 4096;
+    void *a = cpu_physical_memory_map(data & ~0xffful, &len, 0);
+
+    /* We might not be able to get the full page, only mprotect what we actually
+       have mapped */
+    mprotect(a, len, PROT_NONE);
+    mprotect(a, len, PROT_READ|PROT_WRITE);
+    cpu_physical_memory_unmap(a, len, 0, 0);
+}
+
+static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len)
+{
+    struct PCTestdev *dev = opaque;
+    uint64_t ret = 0;
+    memcpy(&ret, &dev->iomem_buf[addr], len);
+    ret = le64_to_cpu(ret);
+
+    return ret;
+}
+
+static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val,
+                             unsigned len)
+{
+    struct PCTestdev *dev = opaque;
+    val = cpu_to_le64(val);
+    memcpy(&dev->iomem_buf[addr], &val, len);
+    dev->iomem_buf[addr] = val;
+}
+
+static const MemoryRegionOps test_iomem_ops = {
+    .read = test_iomem_read,
+    .write = test_iomem_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static const MemoryRegionPortio test_dev_portio_list[] = {
+    { 0xe0, 1, 1, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe0, 1, 2, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe0, 1, 4, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe4, 1, 4, .write = test_device_flush_page, },
+    { 0x2000, 24, 1, .write = test_device_irq_line, },
+    PORTIO_END_OF_LIST(),
+};
+
+static int init_test_device(ISADevice *isa)
+{
+    struct PCTestdev *dev = DO_UPCAST(struct PCTestdev, dev, isa);
+
+    PortioList *test_dev_port_list = g_new(PortioList, 1);
+    portio_list_init(test_dev_port_list, test_dev_portio_list,
+                     NULL, "pc-testdev");
+    portio_list_add(test_dev_port_list, get_system_io(), 0x0);
+
+    memory_region_init_io(&dev->iomem, &test_iomem_ops, dev,
+                          "pc-testdev", IOMEM_LEN);
+    memory_region_add_subregion(isa_address_space(&dev->dev), 0xff000000,
+                                                  &dev->iomem);
+    return 0;
+}
+
+static void testdev_class_init(ObjectClass *klass, void *data)
+{
+    ISADeviceClass *k = ISA_DEVICE_CLASS(klass);
+
+    k->init = init_test_device;
+}
+
+static TypeInfo testdev_info = {
+    .name           = "pc-testdev",
+    .parent         = TYPE_ISA_DEVICE,
+    .instance_size  = sizeof(struct PCTestdev),
+    .class_init     = testdev_class_init,
+};
+
+static void testdev_register_types(void)
+{
+    type_register_static(&testdev_info);
+}
+
+type_init(testdev_register_types)