[1/2] hw: add isa-debug-exit device v3

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 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>
---
 hw/debugexit.c        |   73 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/i386/Makefile.objs |    2 +-
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 hw/debugexit.c

Am 13.12.2012 15:48, schrieb Lucas Meneghel Rodrigues:
> 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 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>

This is lacking your Sob.

> ---
>  hw/debugexit.c        |   73 +++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/i386/Makefile.objs |    2 +-
>  2 files changed, 74 insertions(+), 1 deletion(-)
>  create mode 100644 hw/debugexit.c
> 
> diff --git a/hw/debugexit.c b/hw/debugexit.c
> new file mode 100644
> index 0000000..dfe1b2d
> --- /dev/null
> +++ b/hw/debugexit.c
> @@ -0,0 +1,73 @@
> +/*

Add a one-line description plus some copyright line?

> + * 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 or
> + * (at your option) version 3 of the License.

Why not "any later version"?

> + */
> +
> +#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 TypeInfo debug_exit_info = {

static const, if resubmitted

> +    .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

Otherwise looks good, CC'ing Hervé who did an earlier patch like this.

Andreas

Andreas Färber a écrit :
> Am 13.12.2012 15:48, schrieb Lucas Meneghel Rodrigues:
>> 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 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>
> 
>> ---
>>  hw/debugexit.c        |   73 +++++++++++++++++++++++++++++++++++++++++++++++++
>>  hw/i386/Makefile.objs |    2 +-
>>  2 files changed, 74 insertions(+), 1 deletion(-)
>>  create mode 100644 hw/debugexit.c
>>
>> diff --git a/hw/debugexit.c b/hw/debugexit.c
>> new file mode 100644
>> index 0000000..dfe1b2d
>> --- /dev/null
>> +++ b/hw/debugexit.c
>> @@ -0,0 +1,73 @@
>> +/*
> 
> Add a one-line description plus some copyright line?
> 
>> + * 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 or
>> + * (at your option) version 3 of the License.
> 
> Why not "any later version"?
> 
>> + */
>> +
>> +#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 TypeInfo debug_exit_info = {
> 
> static const, if resubmitted
> 
>> +    .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
> 
> Otherwise looks good, CC'ing Hervé who did an earlier patch like this.

I see some differences with my patch available at 
http://patchwork.ozlabs.org/patch/169542/

Your patch breaks behaviour for access sizes > 1.
- Current code in QEMU accepts access sizes of 2, which means that if 
you write value 0x1234 to port 0x501, you'll exit with (0x1234 << 1) | 1.
- After your patch, as you're explicitly stating that 
valid.max_access_size = 1, a write of size 2 will be considered as invalid.

I never got any answer from Anthony if he is using access size of 1 or 2 
for his test suite... (see http://patchwork.ozlabs.org/patch/169543/)

I can easily revive my patch if Anthony wants something else that 
iobase=0x501 and access-size=1 by default.

Once again, putting Anthony in Cc to have an answer.

Regards,

Hervé

On 12/13/2012 12:48 PM, Lucas Meneghel Rodrigues wrote:
> 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.

Hello Anthony,

So, there's this device that we need to get the test dev upstream to 
support kvm-unit-tests and get rid of testing qemu-kvm.git once for all. 
Hervé sent a similar patch, with some important differences (access 
sizes >1).

http://patchwork.ozlabs.org/patch/169542/

Could you let us know what is your preference, so I can coordinate with 
Hervé the needed patches to get the test device upstream? This work 
should be all done by 1.3, but got stalled, now I'd like to do what's 
necessary to finish it.

Thanks!

Lucas

> 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>
> ---
>   hw/debugexit.c        |   73 +++++++++++++++++++++++++++++++++++++++++++++++++
>   hw/i386/Makefile.objs |    2 +-
>   2 files changed, 74 insertions(+), 1 deletion(-)
>   create mode 100644 hw/debugexit.c
>
> diff --git a/hw/debugexit.c b/hw/debugexit.c
> new file mode 100644
> index 0000000..dfe1b2d
> --- /dev/null
> +++ b/hw/debugexit.c
> @@ -0,0 +1,73 @@
> +/*
> + * 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 or
> + * (at your option) version 3 of the License.
> + */
> +
> +#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 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
>

> Hello Anthony,
> 
> So, there's this device that we need to get the test dev upstream to
> support kvm-unit-tests and get rid of testing qemu-kvm.git once for all.
> Hervé sent a similar patch, with some important differences (access
> sizes >1).

/me updated debug exit device so it handles all access sizes and also
has the size of the io region configurable.  So it should cover all use
cases now.

Also picked up testdev.  Updated series just posted.

cheers,
  Gerd