Re: [Xen-devel] [QEMU][RFC PATCH 3/6] memory: Add xen memory hook

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sun, 25 Mar 2012, Avi Kivity wrote:
> On 03/23/2012 06:37 PM, Jan Kiszka wrote:
> > On 2012-03-23 16:08, Julien Grall wrote:
> > > On 03/22/2012 05:44 PM, Jan Kiszka wrote:
> > >>>
> > >>>   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)?
> > >>    
> > > QEMU doesn't seem to call region_add/region_del for ioport.
> > > Moreover, some of ioport are directly register without
> > > using memory hook (for example cirrus vga).
> > > 
> > > What is the best way to do it ?
> >
> > I haven't looked at details. Maybe it is just a combination of "use case
> > not yet considered, but can easily be added" and "need to switch legacy
> > code to new scheme". Then this still remains the better option than this
> > hook. Avi?
> 
> Just the second - region_add/del will be called, but only for ioports
> registered via the MemoryRegion APIs.

It looks like there are quite a few register_ioport_read/write left
around, especially in the following files:

hw/acpi_piix4.c
hw/cirrus_vga.c
hw/serial.c
hw/pckbd.c
hw/pc.c

I guess they should all be converted to memory_region_init_io, right?

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