On 2012-03-22 17:01, Julien Grall wrote:
> QEMU will now register all memory range (PIO and MMIO) in Xen.
> We distinct two phases in memory registered :
>   - initialization
>   - running
> 
> For all range registered during the initialization, QEMU will
> check with XenStore if it is authorized to use them.
> After the initialization, QEMU can register all range. Indeed,
> the new ranges will be for PCI Bar.
> 
> Signed-off-by: Julien Grall <julien.grall@citrix.com>
> ---
>  exec.c    |    9 ++++++
>  ioport.c  |   17 ++++++++++++
>  xen-all.c |   83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 109 insertions(+), 0 deletions(-)
> 
> diff --git a/exec.c b/exec.c
> index 780f63f..42d8c56 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -3557,12 +3557,21 @@ static void core_commit(MemoryListener *listener)
>  static void core_region_add(MemoryListener *listener,
>                              MemoryRegionSection *section)
>  {
> +    if (xen_enabled()) {
> +       xen_map_iorange(section->offset_within_address_space,
> +                       section->size, 1);
> +    }
> +
>      cpu_register_physical_memory_log(section, section->readonly);
>  }
>  
>  static void core_region_del(MemoryListener *listener,
>                              MemoryRegionSection *section)
>  {
> +    if (xen_enabled()) {
> +       xen_unmap_iorange(section->offset_within_address_space,
> +                       section->size, 1);
> +    }
>  }

memory_listener_register(xen_io_hooks, system_memory)?

>  
>  static void core_region_nop(MemoryListener *listener,
> diff --git a/ioport.c b/ioport.c
> index 78a3b89..073ed75 100644
> --- a/ioport.c
> +++ b/ioport.c
> @@ -28,6 +28,7 @@
>  #include "ioport.h"
>  #include "trace.h"
>  #include "memory.h"
> +#include "hw/xen.h"
>  
>  /***********************************************************/
>  /* IO Port */
> @@ -155,6 +156,11 @@ int register_ioport_read(pio_addr_t start, int length, int size,
>                       i);
>          ioport_opaque[i] = opaque;
>      }
> +
> +    if (xen_enabled()) {
> +        xen_map_iorange(start, length, 0);
> +    }
> +
>      return 0;
>  }
>  
> @@ -175,7 +181,13 @@ int register_ioport_write(pio_addr_t start, int length, int size,
>                       i);
>          ioport_opaque[i] = opaque;
>      }
> +
> +    if (xen_enabled()) {
> +        xen_map_iorange(start, length, 0);
> +    }
> +
>      return 0;
> +
>  }
>  
>  static uint32_t ioport_readb_thunk(void *opaque, uint32_t addr)
> @@ -260,6 +272,11 @@ void isa_unassign_ioport(pio_addr_t start, int length)
>          ioport_destructor_table[start](ioport_opaque[start]);
>          ioport_destructor_table[start] = NULL;
>      }
> +
> +    if (xen_enabled()) {
> +        xen_unmap_iorange(start, length, 0);
> +    }
> +
>      for(i = start; i < start + length; i++) {
>          ioport_read_table[0][i] = NULL;
>          ioport_read_table[1][i] = NULL;

memory_listener_register(xen_hooks, system_io)?

Even if that is not yet powerful enough, tuning the hooks is usually
better than open-coding.

Jan