[Qemu-devel] [PATCH] hw/pc.c: Fix converting of ioport_register* to MemoryRegion

[Qemu-devel] [PATCH] hw/pc.c: Fix converting of ioport_register* to MemoryRegion

[Julien Grall]

The commit 258711 introduced MemoryRegion to replace ioport_region*
for ioport 80h and F0h.
A MemoryRegion needs to have both read and write callback otherwise a segfault
will occur when an access is made.

The previous behaviour of this both ioport is to return 0xffffffffffffffff.
So keep this behaviour.

Reported-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Julien Grall <julien.grall@citrix.com>
---
 hw/pc.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/pc.c b/hw/pc.c
index df0c48e..90b1bf7 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -103,6 +103,11 @@ static void ioport80_write(void *opaque, hwaddr addr, uint64_t data,
 {
 }
 
+static uint64_t ioport80_read(void *opaque, hwaddr addr, unsigned size)
+{
+    return 0xffffffffffffffff;
+}
+
 /* MSDOS compatibility mode FPU exception support */
 static qemu_irq ferr_irq;
 
@@ -123,6 +128,11 @@ static void ioportF0_write(void *opaque, hwaddr addr, uint64_t data,
     qemu_irq_lower(ferr_irq);
 }
 
+static uint64_t ioportF0_read(void *opaque, hwaddr addr, unsigned size)
+{
+    return 0xffffffffffffffff;
+}
+
 /* TSC handling */
 uint64_t cpu_get_tsc(CPUX86State *env)
 {
@@ -960,6 +970,7 @@ static void cpu_request_exit(void *opaque, int irq, int level)
 
 static const MemoryRegionOps ioport80_io_ops = {
     .write = ioport80_write,
+    .read = ioport80_read,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .impl = {
         .min_access_size = 1,
@@ -969,6 +980,7 @@ static const MemoryRegionOps ioport80_io_ops = {
 
 static const MemoryRegionOps ioportF0_io_ops = {
     .write = ioportF0_write,
+    .read = ioportF0_read,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .impl = {
         .min_access_size = 1,
-- 
Julien Grall

Re: [Qemu-devel] [PATCH] hw/pc.c: Fix converting of ioport_register* to MemoryRegion

[Adam Lackorzynski]

On Wed Jan 09, 2013 at 18:10:22 +0000, Julien Grall wrote:
> The commit 258711 introduced MemoryRegion to replace ioport_region*
> for ioport 80h and F0h.
> A MemoryRegion needs to have both read and write callback otherwise a segfault
> will occur when an access is made.
> 
> The previous behaviour of this both ioport is to return 0xffffffffffffffff.
> So keep this behaviour.

Thanks, confirmed.

> Reported-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
> Signed-off-by: Julien Grall <julien.grall@citrix.com>

Tested-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>

> ---
>  hw/pc.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/hw/pc.c b/hw/pc.c
> index df0c48e..90b1bf7 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -103,6 +103,11 @@ static void ioport80_write(void *opaque, hwaddr addr, uint64_t data,
>  {
>  }
>  
> +static uint64_t ioport80_read(void *opaque, hwaddr addr, unsigned size)
> +{
> +    return 0xffffffffffffffff;
> +}
> +
>  /* MSDOS compatibility mode FPU exception support */
>  static qemu_irq ferr_irq;
>  
> @@ -123,6 +128,11 @@ static void ioportF0_write(void *opaque, hwaddr addr, uint64_t data,
>      qemu_irq_lower(ferr_irq);
>  }
>  
> +static uint64_t ioportF0_read(void *opaque, hwaddr addr, unsigned size)
> +{
> +    return 0xffffffffffffffff;
> +}
> +
>  /* TSC handling */
>  uint64_t cpu_get_tsc(CPUX86State *env)
>  {
> @@ -960,6 +970,7 @@ static void cpu_request_exit(void *opaque, int irq, int level)
>  
>  static const MemoryRegionOps ioport80_io_ops = {
>      .write = ioport80_write,
> +    .read = ioport80_read,
>      .endianness = DEVICE_NATIVE_ENDIAN,
>      .impl = {
>          .min_access_size = 1,
> @@ -969,6 +980,7 @@ static const MemoryRegionOps ioport80_io_ops = {
>  
>  static const MemoryRegionOps ioportF0_io_ops = {
>      .write = ioportF0_write,
> +    .read = ioportF0_read,
>      .endianness = DEVICE_NATIVE_ENDIAN,
>      .impl = {
>          .min_access_size = 1,
> -- 
> Julien Grall
> 

Adam
-- 
Adam                 adam@os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/

Re: [Qemu-devel] [Qemu-trivial] [PATCH] hw/pc.c: Fix converting of ioport_register* to MemoryRegion

[Stefan Hajnoczi]

On Wed, Jan 09, 2013 at 06:10:22PM +0000, Julien Grall wrote:
> The commit 258711 introduced MemoryRegion to replace ioport_region*
> for ioport 80h and F0h.
> A MemoryRegion needs to have both read and write callback otherwise a segfault
> will occur when an access is made.
> 
> The previous behaviour of this both ioport is to return 0xffffffffffffffff.
> So keep this behaviour.
> 
> Reported-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
> Signed-off-by: Julien Grall <julien.grall@citrix.com>
> ---
>  hw/pc.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)

Thanks, applied to the trivial patches tree:
https://github.com/stefanha/qemu/commits/trivial-patches

Stefan