Re: [Qemu-devel] [Qemu-trivial] [PATCH] memory-region: Report if region is read-only on info mtree

[Stefan Hajnoczi <stefanha@gmail.com>]

On Sat, Feb 04, 2012 at 03:51:43PM +0100, Jan Kiszka wrote:
> On 2012-02-04 13:32, Blue Swirl wrote:
> > On Sat, Feb 4, 2012 at 12:23, Jan Kiszka <jan.kiszka@web.de> wrote:
> >> On 2012-02-04 13:12, Blue Swirl wrote:
> >>> On Fri, Feb 3, 2012 at 12:02, Jan Kiszka <jan.kiszka@siemens.com> wrote:
> >>>> Helpful to understand guest configurations of things like the i440FX's
> >>>> PAM.
> >>>>
> >>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> >>>> ---
> >>>>  memory.c |    6 ++++--
> >>>>  1 files changed, 4 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/memory.c b/memory.c
> >>>> index ee4c98a..ea4adda 100644
> >>>> --- a/memory.c
> >>>> +++ b/memory.c
> >>>> @@ -1608,23 +1608,25 @@ static void mtree_print_mr(fprintf_function mon_printf, void *f,
> >>>>             ml->printed = false;
> >>>>             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
> >>>>         }
> >>>> -        mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): alias %s @%s "
> >>>> +        mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %s): alias %s @%s "
> >>>>                    TARGET_FMT_plx "-" TARGET_FMT_plx "\n",
> >>>>                    base + mr->addr,
> >>>>                    base + mr->addr
> >>>>                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
> >>>>                    mr->priority,
> >>>> +                   mr->readonly ? "RO" : "RW",
> >>>
> >>> I think the reserved regions which are unreadable and unwritable
> >>> should be shown as well. Then the output should be a combination of
> >>> 'R', 'W' or neither ('-').
> >>
> >> Reserved regions are in the hand of some other device model (so far only
> >> the KVM kernel). That says nothing about their R/W property. If we ever
> >> have a reserved region that is not writable, the owner could still set
> >> the corresponding flag for documentation purposes.
> > 
> > OK. But it's also possible for a region to have readable == false
> > while readonly == false, which would imply 'WO' or '-W'. That also
> > supports separate 'R', 'W' and '-' flags.
> 
> Yep, I encoded the ROM device state as well. And this revealed a
> regression of the memory region conversion of the cfi02. Gave up
> counting how often I fixed this type of bug in the flash code.

Is this patch ready to go?  Seems fine to me but do you still want to
add the 'WO' output that Blue Swirl suggested?

Stefan