[PATCH 0/7] system/memory: Improve 'info mtree' readability

[PATCH 0/7] system/memory: Improve 'info mtree' readability

[Philippe Mathieu-Daudé]

Cleaning dust, I had forgotten about this branch. In short,
it improves 'info mtree' readability of addresses.

Currently with Q35:

    address-space: I/O
      0000000000000000-000000000000ffff (prio 0, i/o): io
          0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
          0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
          0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
          0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
          0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
          0000000000000060-000000000000007f (prio 0, i/o): sm-tco
        0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
        0000000000000008-000000000000000f (prio 0, i/o): dma-cont
        0000000000000020-0000000000000021 (prio 0, i/o): pic
        0000000000000040-0000000000000043 (prio 0, i/o): pit
        ...
    memory-region: pc.ram
      0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
    memory-region: pc.bios
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    memory-region: pci
      0000000000000000-ffffffffffffffff (prio -1, i/o): pci
        00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
        00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
        00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
        00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    ...

With this series:

    address-space: I/O
      0000-ffff (prio 0, container): io
          0000-0003 (prio 0, i/o): acpi-evt
          0004-0005 (prio 0, i/o): acpi-cnt
          0008-000b (prio 0, i/o): acpi-tmr
          0020-002f (prio 0, i/o): acpi-gpe0
          0030-0037 (prio 0, i/o): acpi-smi
          0060-007f (prio 0, i/o): sm-tco
        0000-0007 (prio 0, i/o): dma-chan
        0008-000f (prio 0, i/o): dma-cont
        0020-0021 (prio 0, i/o): pic
        0040-0043 (prio 0, i/o): pit
        ...
    memory-region: pc.ram
      00000000-07ffffff (prio 0, ram): pc.ram
    memory-region: pc.bios
      fffc0000-ffffffff (prio 0, rom): pc.bios
    memory-region: pci
      0000000000000000-ffffffffffffffff (prio -1, i/o): pci
        00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
        00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
        00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
        00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    ...

Philippe Mathieu-Daudé (7):
  stubs: Merge physmem.c within ram-block.c
  system/ramblock: Constify various RAMBlock arguments
  system/memory: Constify various MemoryRegion arguments
  system/memory: Have memory_region_type() correctly describe containers
  system/memory: Display address spaces starting at 0x0000.0000
  system/memory: Allow mtree_print_mr() to display distinct address
    width
  system/memory: Have 'info mtree' display addresses nicely

 include/system/memory.h   |  28 +++++-----
 include/system/ramblock.h |  26 ++++-----
 stubs/physmem.c           |  13 -----
 stubs/ram-block.c         |  17 ++++--
 system/memory.c           | 108 ++++++++++++++++++++++++--------------
 system/physmem.c          |  26 ++++-----
 stubs/meson.build         |   1 -
 7 files changed, 123 insertions(+), 96 deletions(-)
 delete mode 100644 stubs/physmem.c

-- 
2.52.0

[PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Philippe Mathieu-Daudé]

physmem.c defines 2 stubs which are related to ram-block:
qemu_ram_block_from_host() and qemu_ram_get_fd().
Move them with the other ram-block stubs.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 stubs/physmem.c   | 13 -------------
 stubs/ram-block.c | 11 +++++++++++
 stubs/meson.build |  1 -
 3 files changed, 11 insertions(+), 14 deletions(-)
 delete mode 100644 stubs/physmem.c

diff --git a/stubs/physmem.c b/stubs/physmem.c
deleted file mode 100644
index 14667f2bd8f..00000000000
--- a/stubs/physmem.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include "qemu/osdep.h"
-#include "system/ramblock.h"
-
-RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
-                                   ram_addr_t *offset)
-{
-    return NULL;
-}
-
-int qemu_ram_get_fd(RAMBlock *rb)
-{
-    return -1;
-}
diff --git a/stubs/ram-block.c b/stubs/ram-block.c
index 8790a59593e..f0650b19ac6 100644
--- a/stubs/ram-block.c
+++ b/stubs/ram-block.c
@@ -35,3 +35,14 @@ int ram_block_discard_disable(bool state)
 {
     return 0;
 }
+
+RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
+                                   ram_addr_t *offset)
+{
+    return NULL;
+}
+
+int qemu_ram_get_fd(RAMBlock *rb)
+{
+    return -1;
+}
diff --git a/stubs/meson.build b/stubs/meson.build
index 8a07059500d..0171f531523 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -20,7 +20,6 @@ if have_block
   stub_ss.add(files('get-vm-name.c'))
   stub_ss.add(files('iothread-lock-block.c'))
   stub_ss.add(files('migr-blocker.c'))
-  stub_ss.add(files('physmem.c'))
   stub_ss.add(files('ram-block.c'))
   stub_ss.add(files('runstate-check.c'))
   stub_ss.add(files('uuid.c'))
-- 
2.52.0

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> physmem.c defines 2 stubs which are related to ram-block:
> qemu_ram_block_from_host() and qemu_ram_get_fd().
> Move them with the other ram-block stubs.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   stubs/physmem.c   | 13 -------------
>   stubs/ram-block.c | 11 +++++++++++
>   stubs/meson.build |  1 -
>   3 files changed, 11 insertions(+), 14 deletions(-)
>   delete mode 100644 stubs/physmem.c
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[BALATON Zoltan]

[-- Attachment #1: Type: text/plain, Size: 2072 bytes --]

On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
> physmem.c defines 2 stubs which are related to ram-block:
> qemu_ram_block_from_host() and qemu_ram_get_fd().
> Move them with the other ram-block stubs.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
> stubs/physmem.c   | 13 -------------
> stubs/ram-block.c | 11 +++++++++++

Maybe should be the other way around moving what's in subs/ram-block.c to 
stubs/physmem.c considering the the functions these stub out are in 
system/physmem.c and there's no system/ram-block.c.

Regards,
BALATON Zoltan

> stubs/meson.build |  1 -
> 3 files changed, 11 insertions(+), 14 deletions(-)
> delete mode 100644 stubs/physmem.c
>
> diff --git a/stubs/physmem.c b/stubs/physmem.c
> deleted file mode 100644
> index 14667f2bd8f..00000000000
> --- a/stubs/physmem.c
> +++ /dev/null
> @@ -1,13 +0,0 @@
> -#include "qemu/osdep.h"
> -#include "system/ramblock.h"
> -
> -RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
> -                                   ram_addr_t *offset)
> -{
> -    return NULL;
> -}
> -
> -int qemu_ram_get_fd(RAMBlock *rb)
> -{
> -    return -1;
> -}
> diff --git a/stubs/ram-block.c b/stubs/ram-block.c
> index 8790a59593e..f0650b19ac6 100644
> --- a/stubs/ram-block.c
> +++ b/stubs/ram-block.c
> @@ -35,3 +35,14 @@ int ram_block_discard_disable(bool state)
> {
>     return 0;
> }
> +
> +RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
> +                                   ram_addr_t *offset)
> +{
> +    return NULL;
> +}
> +
> +int qemu_ram_get_fd(RAMBlock *rb)
> +{
> +    return -1;
> +}
> diff --git a/stubs/meson.build b/stubs/meson.build
> index 8a07059500d..0171f531523 100644
> --- a/stubs/meson.build
> +++ b/stubs/meson.build
> @@ -20,7 +20,6 @@ if have_block
>   stub_ss.add(files('get-vm-name.c'))
>   stub_ss.add(files('iothread-lock-block.c'))
>   stub_ss.add(files('migr-blocker.c'))
> -  stub_ss.add(files('physmem.c'))
>   stub_ss.add(files('ram-block.c'))
>   stub_ss.add(files('runstate-check.c'))
>   stub_ss.add(files('uuid.c'))
>

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Akihiko Odaki]

On 2026/02/27 7:22, BALATON Zoltan wrote:
> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>> physmem.c defines 2 stubs which are related to ram-block:
>> qemu_ram_block_from_host() and qemu_ram_get_fd().
>> Move them with the other ram-block stubs.
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>> ---
>> stubs/physmem.c   | 13 -------------
>> stubs/ram-block.c | 11 +++++++++++
> 
> Maybe should be the other way around moving what's in subs/ram-block.c 
> to stubs/physmem.c considering the the functions these stub out are in 
> system/physmem.c and there's no system/ram-block.c.

But this stubs out functions in "ramblock.h" (though it's not
"ram-block.h")

Regards,
Akihiko Odaki

> 
> Regards,
> BALATON Zoltan
> 
>> stubs/meson.build |  1 -
>> 3 files changed, 11 insertions(+), 14 deletions(-)
>> delete mode 100644 stubs/physmem.c
>>
>> diff --git a/stubs/physmem.c b/stubs/physmem.c
>> deleted file mode 100644
>> index 14667f2bd8f..00000000000
>> --- a/stubs/physmem.c
>> +++ /dev/null
>> @@ -1,13 +0,0 @@
>> -#include "qemu/osdep.h"
>> -#include "system/ramblock.h"
>> -
>> -RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
>> -                                   ram_addr_t *offset)
>> -{
>> -    return NULL;
>> -}
>> -
>> -int qemu_ram_get_fd(RAMBlock *rb)
>> -{
>> -    return -1;
>> -}
>> diff --git a/stubs/ram-block.c b/stubs/ram-block.c
>> index 8790a59593e..f0650b19ac6 100644
>> --- a/stubs/ram-block.c
>> +++ b/stubs/ram-block.c
>> @@ -35,3 +35,14 @@ int ram_block_discard_disable(bool state)
>> {
>>     return 0;
>> }
>> +
>> +RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
>> +                                   ram_addr_t *offset)
>> +{
>> +    return NULL;
>> +}
>> +
>> +int qemu_ram_get_fd(RAMBlock *rb)
>> +{
>> +    return -1;
>> +}
>> diff --git a/stubs/meson.build b/stubs/meson.build
>> index 8a07059500d..0171f531523 100644
>> --- a/stubs/meson.build
>> +++ b/stubs/meson.build
>> @@ -20,7 +20,6 @@ if have_block
>>   stub_ss.add(files('get-vm-name.c'))
>>   stub_ss.add(files('iothread-lock-block.c'))
>>   stub_ss.add(files('migr-blocker.c'))
>> -  stub_ss.add(files('physmem.c'))
>>   stub_ss.add(files('ram-block.c'))
>>   stub_ss.add(files('runstate-check.c'))
>>   stub_ss.add(files('uuid.c'))
>>

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Philippe Mathieu-Daudé]

On 2/3/26 07:21, Akihiko Odaki wrote:
> On 2026/02/27 7:22, BALATON Zoltan wrote:
>> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>>> physmem.c defines 2 stubs which are related to ram-block:
>>> qemu_ram_block_from_host() and qemu_ram_get_fd().
>>> Move them with the other ram-block stubs.
>>>
>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>> ---
>>> stubs/physmem.c   | 13 -------------
>>> stubs/ram-block.c | 11 +++++++++++
>>
>> Maybe should be the other way around moving what's in subs/ram-block.c 
>> to stubs/physmem.c considering the the functions these stub out are in 
>> system/physmem.c and there's no system/ram-block.c.

Fine, I'll drop this patch if you think it is not worthwhile.

> 
> But this stubs out functions in "ramblock.h" (though it's not
> "ram-block.h")
> 
> Regards,
> Akihiko Odaki
> 
>>
>> Regards,
>> BALATON Zoltan

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[BALATON Zoltan]

[-- Attachment #1: Type: text/plain, Size: 1099 bytes --]

On Tue, 3 Mar 2026, Philippe Mathieu-Daudé wrote:
> On 2/3/26 07:21, Akihiko Odaki wrote:
>> On 2026/02/27 7:22, BALATON Zoltan wrote:
>>> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>>>> physmem.c defines 2 stubs which are related to ram-block:
>>>> qemu_ram_block_from_host() and qemu_ram_get_fd().
>>>> Move them with the other ram-block stubs.
>>>> 
>>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>>> ---
>>>> stubs/physmem.c   | 13 -------------
>>>> stubs/ram-block.c | 11 +++++++++++
>>> 
>>> Maybe should be the other way around moving what's in subs/ram-block.c to 
>>> stubs/physmem.c considering the the functions these stub out are in 
>>> system/physmem.c and there's no system/ram-block.c.
>
> Fine, I'll drop this patch if you think it is not worthwhile.

I did not say that, only that the functions are in system/physmem.c so why 
not put the stubs in stubs/physmem.c to match? Since there's no 
system/ram-block.c I think it makes more sense to merge these into 
stubs/physmem.c instead. But just leaving it as it is is also OK.

Regards,
BALATON Zoltan

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Philippe Mathieu-Daudé]

On 3/3/26 18:20, BALATON Zoltan wrote:
> On Tue, 3 Mar 2026, Philippe Mathieu-Daudé wrote:
>> On 2/3/26 07:21, Akihiko Odaki wrote:
>>> On 2026/02/27 7:22, BALATON Zoltan wrote:
>>>> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>>>>> physmem.c defines 2 stubs which are related to ram-block:
>>>>> qemu_ram_block_from_host() and qemu_ram_get_fd().
>>>>> Move them with the other ram-block stubs.
>>>>>
>>>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>>>> ---
>>>>> stubs/physmem.c   | 13 -------------
>>>>> stubs/ram-block.c | 11 +++++++++++
>>>>
>>>> Maybe should be the other way around moving what's in subs/ram- 
>>>> block.c to stubs/physmem.c considering the the functions these stub 
>>>> out are in system/physmem.c and there's no system/ram-block.c.
>>
>> Fine, I'll drop this patch if you think it is not worthwhile.
> 
> I did not say that, only that the functions are in system/physmem.c so 
> why not put the stubs in stubs/physmem.c to match? Since there's no 
> system/ram-block.c I think it makes more sense to merge these into 
> stubs/physmem.c instead.

Unfortunately I won't have time to address this change before
soft-freeze, do you mind posting the patch?

Thanks for your review and help here,

Phil.

> But just leaving it as it is is also OK.
> 
> Regards,
> BALATON Zoltan

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[BALATON Zoltan]

[-- Attachment #1: Type: text/plain, Size: 1549 bytes --]

On Wed, 4 Mar 2026, Philippe Mathieu-Daudé wrote:
> On 3/3/26 18:20, BALATON Zoltan wrote:
>> On Tue, 3 Mar 2026, Philippe Mathieu-Daudé wrote:
>>> On 2/3/26 07:21, Akihiko Odaki wrote:
>>>> On 2026/02/27 7:22, BALATON Zoltan wrote:
>>>>> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>>>>>> physmem.c defines 2 stubs which are related to ram-block:
>>>>>> qemu_ram_block_from_host() and qemu_ram_get_fd().
>>>>>> Move them with the other ram-block stubs.
>>>>>> 
>>>>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>>>>> ---
>>>>>> stubs/physmem.c   | 13 -------------
>>>>>> stubs/ram-block.c | 11 +++++++++++
>>>>> 
>>>>> Maybe should be the other way around moving what's in subs/ram- block.c 
>>>>> to stubs/physmem.c considering the the functions these stub out are in 
>>>>> system/physmem.c and there's no system/ram-block.c.
>>> 
>>> Fine, I'll drop this patch if you think it is not worthwhile.
>> 
>> I did not say that, only that the functions are in system/physmem.c so why 
>> not put the stubs in stubs/physmem.c to match? Since there's no 
>> system/ram-block.c I think it makes more sense to merge these into 
>> stubs/physmem.c instead.
>
> Unfortunately I won't have time to address this change before
> soft-freeze, do you mind posting the patch?

I don't think this is a big issue to put much effort in so as I said 
dropping the patch and not changing it is probably the simplest.

> Thanks for your review and help here,
>
> Phil.
>
>> But just leaving it as it is is also OK.

Regards,
BALATON Zoltan

Re: [PATCH 1/7] stubs: Merge physmem.c within ram-block.c

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:19PM +0100, Philippe Mathieu-Daudé wrote:
> physmem.c defines 2 stubs which are related to ram-block:
> qemu_ram_block_from_host() and qemu_ram_get_fd().
> Move them with the other ram-block stubs.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu

[PATCH 2/7] system/ramblock: Constify various RAMBlock arguments

[Philippe Mathieu-Daudé]

Mark the RAMBlock structure const when is only accessed read-only.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/system/ramblock.h | 26 +++++++++++++-------------
 stubs/ram-block.c         |  8 ++++----
 system/physmem.c          | 26 +++++++++++++-------------
 3 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/include/system/ramblock.h b/include/system/ramblock.h
index e9f58ac0457..221e8e5d03e 100644
--- a/include/system/ramblock.h
+++ b/include/system/ramblock.h
@@ -154,24 +154,24 @@ RAMBlock *qemu_ram_block_by_name(const char *name);
  */
 RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
                                    ram_addr_t *offset);
-ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host);
+ram_addr_t qemu_ram_block_host_offset(const RAMBlock *rb, void *host);
 void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev);
 void qemu_ram_unset_idstr(RAMBlock *block);
-const char *qemu_ram_get_idstr(RAMBlock *rb);
-void *qemu_ram_get_host_addr(RAMBlock *rb);
-ram_addr_t qemu_ram_get_offset(RAMBlock *rb);
-ram_addr_t qemu_ram_get_fd_offset(RAMBlock *rb);
-ram_addr_t qemu_ram_get_used_length(RAMBlock *rb);
-ram_addr_t qemu_ram_get_max_length(RAMBlock *rb);
-bool qemu_ram_is_shared(RAMBlock *rb);
-bool qemu_ram_is_noreserve(RAMBlock *rb);
-bool qemu_ram_is_uf_zeroable(RAMBlock *rb);
+const char *qemu_ram_get_idstr(const RAMBlock *rb);
+void *qemu_ram_get_host_addr(const RAMBlock *rb);
+ram_addr_t qemu_ram_get_offset(const RAMBlock *rb);
+ram_addr_t qemu_ram_get_fd_offset(const RAMBlock *rb);
+ram_addr_t qemu_ram_get_used_length(const RAMBlock *rb);
+ram_addr_t qemu_ram_get_max_length(const RAMBlock *rb);
+bool qemu_ram_is_shared(const RAMBlock *rb);
+bool qemu_ram_is_noreserve(const RAMBlock *rb);
+bool qemu_ram_is_uf_zeroable(const RAMBlock *rb);
 void qemu_ram_set_uf_zeroable(RAMBlock *rb);
-bool qemu_ram_is_migratable(RAMBlock *rb);
+bool qemu_ram_is_migratable(const RAMBlock *rb);
 void qemu_ram_set_migratable(RAMBlock *rb);
 void qemu_ram_unset_migratable(RAMBlock *rb);
-bool qemu_ram_is_named_file(RAMBlock *rb);
-int qemu_ram_get_fd(RAMBlock *rb);
+bool qemu_ram_is_named_file(const RAMBlock *rb);
+int qemu_ram_get_fd(const RAMBlock *rb);
 
 size_t qemu_ram_pagesize(RAMBlock *block);
 size_t qemu_ram_pagesize_largest(void);
diff --git a/stubs/ram-block.c b/stubs/ram-block.c
index f0650b19ac6..3ca47214a0c 100644
--- a/stubs/ram-block.c
+++ b/stubs/ram-block.c
@@ -3,17 +3,17 @@
 #include "system/ramblock.h"
 #include "system/memory.h"
 
-void *qemu_ram_get_host_addr(RAMBlock *rb)
+void *qemu_ram_get_host_addr(const RAMBlock *rb)
 {
     return 0;
 }
 
-ram_addr_t qemu_ram_get_offset(RAMBlock *rb)
+ram_addr_t qemu_ram_get_offset(const RAMBlock *rb)
 {
     return 0;
 }
 
-ram_addr_t qemu_ram_get_used_length(RAMBlock *rb)
+ram_addr_t qemu_ram_get_used_length(const RAMBlock *rb)
 {
     return 0;
 }
@@ -42,7 +42,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
     return NULL;
 }
 
-int qemu_ram_get_fd(RAMBlock *rb)
+int qemu_ram_get_fd(const RAMBlock *rb)
 {
     return -1;
 }
diff --git a/system/physmem.c b/system/physmem.c
index 2fb0c25c93b..2384c6dbba4 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -1857,48 +1857,48 @@ static void qemu_ram_setup_dump(void *addr, ram_addr_t size)
     }
 }
 
-const char *qemu_ram_get_idstr(RAMBlock *rb)
+const char *qemu_ram_get_idstr(const RAMBlock *rb)
 {
     return rb->idstr;
 }
 
-void *qemu_ram_get_host_addr(RAMBlock *rb)
+void *qemu_ram_get_host_addr(const RAMBlock *rb)
 {
     return rb->host;
 }
 
-ram_addr_t qemu_ram_get_offset(RAMBlock *rb)
+ram_addr_t qemu_ram_get_offset(const RAMBlock *rb)
 {
     return rb->offset;
 }
 
-ram_addr_t qemu_ram_get_fd_offset(RAMBlock *rb)
+ram_addr_t qemu_ram_get_fd_offset(const RAMBlock *rb)
 {
     return rb->fd_offset;
 }
 
-ram_addr_t qemu_ram_get_used_length(RAMBlock *rb)
+ram_addr_t qemu_ram_get_used_length(const RAMBlock *rb)
 {
     return rb->used_length;
 }
 
-ram_addr_t qemu_ram_get_max_length(RAMBlock *rb)
+ram_addr_t qemu_ram_get_max_length(const RAMBlock *rb)
 {
     return rb->max_length;
 }
 
-bool qemu_ram_is_shared(RAMBlock *rb)
+bool qemu_ram_is_shared(const RAMBlock *rb)
 {
     return rb->flags & RAM_SHARED;
 }
 
-bool qemu_ram_is_noreserve(RAMBlock *rb)
+bool qemu_ram_is_noreserve(const RAMBlock *rb)
 {
     return rb->flags & RAM_NORESERVE;
 }
 
 /* Note: Only set at the start of postcopy */
-bool qemu_ram_is_uf_zeroable(RAMBlock *rb)
+bool qemu_ram_is_uf_zeroable(const RAMBlock *rb)
 {
     return rb->flags & RAM_UF_ZEROPAGE;
 }
@@ -1908,7 +1908,7 @@ void qemu_ram_set_uf_zeroable(RAMBlock *rb)
     rb->flags |= RAM_UF_ZEROPAGE;
 }
 
-bool qemu_ram_is_migratable(RAMBlock *rb)
+bool qemu_ram_is_migratable(const RAMBlock *rb)
 {
     return rb->flags & RAM_MIGRATABLE;
 }
@@ -1923,12 +1923,12 @@ void qemu_ram_unset_migratable(RAMBlock *rb)
     rb->flags &= ~RAM_MIGRATABLE;
 }
 
-bool qemu_ram_is_named_file(RAMBlock *rb)
+bool qemu_ram_is_named_file(const RAMBlock *rb)
 {
     return rb->flags & RAM_NAMED_FILE;
 }
 
-int qemu_ram_get_fd(RAMBlock *rb)
+int qemu_ram_get_fd(const RAMBlock *rb)
 {
     return rb->fd;
 }
@@ -2770,7 +2770,7 @@ void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
 }
 
 /* Return the offset of a hostpointer within a ramblock */
-ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host)
+ram_addr_t qemu_ram_block_host_offset(const RAMBlock *rb, void *host)
 {
     ram_addr_t res = (uint8_t *)host - (uint8_t *)rb->host;
     assert((uintptr_t)host >= (uintptr_t)rb->host);
-- 
2.52.0

Re: [PATCH 2/7] system/ramblock: Constify various RAMBlock arguments

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> Mark the RAMBlock structure const when is only accessed read-only.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   include/system/ramblock.h | 26 +++++++++++++-------------
>   stubs/ram-block.c         |  8 ++++----
>   system/physmem.c          | 26 +++++++++++++-------------
>   3 files changed, 30 insertions(+), 30 deletions(-)
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 2/7] system/ramblock: Constify various RAMBlock arguments

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:20PM +0100, Philippe Mathieu-Daudé wrote:
> Mark the RAMBlock structure const when is only accessed read-only.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu

[PATCH 3/7] system/memory: Constify various MemoryRegion arguments

[Philippe Mathieu-Daudé]

Mark the MemoryRegion structure const when is only accessed read-only.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/system/memory.h | 28 ++++++++++++++--------------
 system/memory.c         | 34 ++++++++++++++++++----------------
 2 files changed, 32 insertions(+), 30 deletions(-)

diff --git a/include/system/memory.h b/include/system/memory.h
index 0562af31361..baa6a840375 100644
--- a/include/system/memory.h
+++ b/include/system/memory.h
@@ -1749,14 +1749,14 @@ bool memory_region_init_rom_device(MemoryRegion *mr,
  *
  * @mr: the memory region being queried.
  */
-Object *memory_region_owner(MemoryRegion *mr);
+Object *memory_region_owner(const MemoryRegion *mr);
 
 /**
  * memory_region_size: get a memory region's size.
  *
  * @mr: the memory region being queried.
  */
-uint64_t memory_region_size(MemoryRegion *mr);
+uint64_t memory_region_size(const MemoryRegion *mr);
 
 /**
  * memory_region_is_ram: check whether a memory region is random access
@@ -1765,7 +1765,7 @@ uint64_t memory_region_size(MemoryRegion *mr);
  *
  * @mr: the memory region being queried
  */
-static inline bool memory_region_is_ram(MemoryRegion *mr)
+static inline bool memory_region_is_ram(const MemoryRegion *mr)
 {
     return mr->ram;
 }
@@ -1777,7 +1777,7 @@ static inline bool memory_region_is_ram(MemoryRegion *mr)
  *
  * @mr: the memory region being queried
  */
-bool memory_region_is_ram_device(MemoryRegion *mr);
+bool memory_region_is_ram_device(const MemoryRegion *mr);
 
 /**
  * memory_region_is_romd: check whether a memory region is in ROMD mode
@@ -1787,7 +1787,7 @@ bool memory_region_is_ram_device(MemoryRegion *mr);
  *
  * @mr: the memory region being queried
  */
-static inline bool memory_region_is_romd(MemoryRegion *mr)
+static inline bool memory_region_is_romd(const MemoryRegion *mr)
 {
     return mr->rom_device && mr->romd_mode;
 }
@@ -1800,7 +1800,7 @@ static inline bool memory_region_is_romd(MemoryRegion *mr)
  *
  * @mr: the memory region being queried
  */
-bool memory_region_is_protected(MemoryRegion *mr);
+bool memory_region_is_protected(const MemoryRegion *mr);
 
 /**
  * memory_region_has_guest_memfd: check whether a memory region has guest_memfd
@@ -1810,7 +1810,7 @@ bool memory_region_is_protected(MemoryRegion *mr);
  *
  * @mr: the memory region being queried
  */
-bool memory_region_has_guest_memfd(MemoryRegion *mr);
+bool memory_region_has_guest_memfd(const MemoryRegion *mr);
 
 /**
  * memory_region_get_iommu: check whether a memory region is an iommu
@@ -1820,7 +1820,7 @@ bool memory_region_has_guest_memfd(MemoryRegion *mr);
  *
  * @mr: the memory region being queried
  */
-static inline IOMMUMemoryRegion *memory_region_get_iommu(MemoryRegion *mr)
+static inline IOMMUMemoryRegion *memory_region_get_iommu(const MemoryRegion *mr)
 {
     if (mr->alias) {
         return memory_region_get_iommu(mr->alias);
@@ -1991,7 +1991,7 @@ const char *memory_region_name(const MemoryRegion *mr);
  * @mr: the memory region being queried
  * @client: the client being queried
  */
-bool memory_region_is_logging(MemoryRegion *mr, uint8_t client);
+bool memory_region_is_logging(const MemoryRegion *mr, uint8_t client);
 
 /**
  * memory_region_get_dirty_log_mask: return the clients for which a
@@ -2002,7 +2002,7 @@ bool memory_region_is_logging(MemoryRegion *mr, uint8_t client);
  *
  * @mr: the memory region being queried
  */
-uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr);
+uint8_t memory_region_get_dirty_log_mask(const MemoryRegion *mr);
 
 /**
  * memory_region_is_rom: check whether a memory region is ROM
@@ -2011,7 +2011,7 @@ uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr);
  *
  * @mr: the memory region being queried
  */
-static inline bool memory_region_is_rom(MemoryRegion *mr)
+static inline bool memory_region_is_rom(const MemoryRegion *mr)
 {
     return mr->ram && mr->readonly;
 }
@@ -2023,7 +2023,7 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
  *
  * @mr: the memory region being queried
  */
-static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
+static inline bool memory_region_is_nonvolatile(const MemoryRegion *mr)
 {
     return mr->nonvolatile;
 }
@@ -2036,7 +2036,7 @@ static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
  *
  * @mr: the RAM or alias memory region being queried.
  */
-int memory_region_get_fd(MemoryRegion *mr);
+int memory_region_get_fd(const MemoryRegion *mr);
 
 /**
  * memory_region_from_host: Convert a pointer into a RAM memory region
@@ -2521,7 +2521,7 @@ bool memory_region_present(MemoryRegion *container, hwaddr addr);
  *
  * @mr: a #MemoryRegion which should be checked if it's mapped
  */
-bool memory_region_is_mapped(MemoryRegion *mr);
+bool memory_region_is_mapped(const MemoryRegion *mr);
 
 /**
  * memory_region_get_ram_discard_manager: get the #RamDiscardManager for a
diff --git a/system/memory.c b/system/memory.c
index c51d0798a84..eeb0d19484f 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -1819,9 +1819,9 @@ static void memory_region_finalize(Object *obj)
     g_free(mr->ioeventfds);
 }
 
-Object *memory_region_owner(MemoryRegion *mr)
+Object *memory_region_owner(const MemoryRegion *mr)
 {
-    Object *obj = OBJECT(mr);
+    const Object *obj = OBJECT(mr);
     return obj->parent;
 }
 
@@ -1849,7 +1849,7 @@ void memory_region_unref(MemoryRegion *mr)
     }
 }
 
-uint64_t memory_region_size(MemoryRegion *mr)
+uint64_t memory_region_size(const MemoryRegion *mr)
 {
     if (int128_eq(mr->size, int128_2_64())) {
         return UINT64_MAX;
@@ -1866,25 +1866,25 @@ const char *memory_region_name(const MemoryRegion *mr)
     return mr->name;
 }
 
-bool memory_region_is_ram_device(MemoryRegion *mr)
+bool memory_region_is_ram_device(const MemoryRegion *mr)
 {
     return mr->ram_device;
 }
 
-bool memory_region_is_protected(MemoryRegion *mr)
+bool memory_region_is_protected(const MemoryRegion *mr)
 {
     return mr->ram && (mr->ram_block->flags & RAM_PROTECTED);
 }
 
-bool memory_region_has_guest_memfd(MemoryRegion *mr)
+bool memory_region_has_guest_memfd(const MemoryRegion *mr)
 {
     return mr->ram_block && mr->ram_block->guest_memfd >= 0;
 }
 
-uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
+uint8_t memory_region_get_dirty_log_mask(const MemoryRegion *mr)
 {
     uint8_t mask = mr->dirty_log_mask;
-    RAMBlock *rb = mr->ram_block;
+    const RAMBlock *rb = mr->ram_block;
 
     if (global_dirty_tracking && ((rb && qemu_ram_is_migratable(rb)) ||
                              memory_region_is_iommu(mr))) {
@@ -1898,7 +1898,7 @@ uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
     return mask;
 }
 
-bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
+bool memory_region_is_logging(const MemoryRegion *mr, uint8_t client)
 {
     return memory_region_get_dirty_log_mask(mr) & (1 << client);
 }
@@ -2406,7 +2406,7 @@ void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
         memory_region_get_ram_addr(mr) + addr, size, client, NULL);
 }
 
-int memory_region_get_fd(MemoryRegion *mr)
+int memory_region_get_fd(const MemoryRegion *mr)
 {
     RCU_READ_LOCK_GUARD();
     while (mr->alias) {
@@ -2806,7 +2806,7 @@ static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
                    sizeof(FlatRange), cmp_flatrange_addr);
 }
 
-bool memory_region_is_mapped(MemoryRegion *mr)
+bool memory_region_is_mapped(const MemoryRegion *mr)
 {
     return !!mr->container || mr->mapped_via_alias;
 }
@@ -3290,7 +3290,7 @@ void address_space_destroy_free(AddressSpace *as)
     call_rcu(as, do_address_space_destroy_free, rcu);
 }
 
-static const char *memory_region_type(MemoryRegion *mr)
+static const char *memory_region_type(const MemoryRegion *mr)
 {
     if (mr->alias) {
         return memory_region_type(mr->alias);
@@ -3483,7 +3483,6 @@ static void mtree_print_flatview(gpointer key, gpointer value,
     GArray *fv_address_spaces = value;
     struct FlatViewInfo *fvi = user_data;
     FlatRange *range = &view->ranges[0];
-    MemoryRegion *mr;
     int n = view->nr;
     int i;
     AddressSpace *as;
@@ -3510,7 +3509,8 @@ static void mtree_print_flatview(gpointer key, gpointer value,
     }
 
     while (n--) {
-        mr = range->mr;
+        const MemoryRegion *mr = range->mr;
+
         if (range->offset_in_region) {
             qemu_printf(MTREE_INDENT HWADDR_FMT_plx "-" HWADDR_FMT_plx
                         " (prio %d, %s%s): %s @" HWADDR_FMT_plx,
@@ -3683,8 +3683,10 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
 
     /* print aliased regions */
     QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
-        qemu_printf("memory-region: %s\n", memory_region_name(ml->mr));
-        mtree_print_mr(ml->mr, 1, 0, &ml_head, owner, disabled);
+        const MemoryRegion *mr = ml->mr;
+
+        qemu_printf("memory-region: %s\n", memory_region_name(mr));
+        mtree_print_mr(mr, 1, 0, &ml_head, owner, disabled);
         qemu_printf("\n");
     }
 
-- 
2.52.0

Re: [PATCH 3/7] system/memory: Constify various MemoryRegion arguments

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> Mark the MemoryRegion structure const when is only accessed read-only.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   include/system/memory.h | 28 ++++++++++++++--------------
>   system/memory.c         | 34 ++++++++++++++++++----------------
>   2 files changed, 32 insertions(+), 30 deletions(-)
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 3/7] system/memory: Constify various MemoryRegion arguments

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:21PM +0100, Philippe Mathieu-Daudé wrote:
> Mark the MemoryRegion structure const when is only accessed read-only.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu

[PATCH 4/7] system/memory: Have memory_region_type() correctly describe containers

[Philippe Mathieu-Daudé]

MemoryRegion containers are not I/O regions,
describe them as 'container'.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 system/memory.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/system/memory.c b/system/memory.c
index eeb0d19484f..d5060774834 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -3303,6 +3303,8 @@ static const char *memory_region_type(const MemoryRegion *mr)
         return "rom";
     } else if (memory_region_is_ram(mr)) {
         return "ram";
+    } else if (!mr->container) {
+        return "container";
     } else {
         return "i/o";
     }
-- 
2.52.0

Re: [PATCH 4/7] system/memory: Have memory_region_type() correctly describe containers

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> MemoryRegion containers are not I/O regions,
> describe them as 'container'.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   system/memory.c | 2 ++
>   1 file changed, 2 insertions(+)
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 4/7] system/memory: Have memory_region_type() correctly describe containers

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:22PM +0100, Philippe Mathieu-Daudé wrote:
> MemoryRegion containers are not I/O regions,
> describe them as 'container'.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu

[PATCH 5/7] system/memory: Display address spaces starting at 0x0000.0000

[Philippe Mathieu-Daudé]

Since AddressSpace root MemoryRegion can be remapped, it is
bogus to use the MemoryRegion address as the AddressSpace
absolute address. Besides, the AddressSpace APIs take an
@addr argument expecting AddressSpaces start at 0x0000.0000.

Substract the MemoryRegion address in mtree_print_mr() to
display AddressSpaces starting at 0x0000.0000.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 system/memory.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/system/memory.c b/system/memory.c
index d5060774834..1106f48d0d5 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -3360,7 +3360,7 @@ static void mtree_print_mr_owner(const MemoryRegion *mr)
 }
 
 static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
-                           hwaddr base,
+                           hwaddr offset, bool detect_overflow,
                            MemoryRegionListHead *alias_print_queue,
                            bool owner, bool display_disabled)
 {
@@ -3374,7 +3374,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
         return;
     }
 
-    cur_start = base + mr->addr;
+    cur_start = mr->addr + offset;
     cur_end = cur_start + MR_SIZE(mr->size);
 
     /*
@@ -3382,7 +3382,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
      * happen normally. When it happens, we dump something to warn the
      * user who is observing this.
      */
-    if (cur_start < base || cur_end < cur_start) {
+    if (detect_overflow && (cur_start < offset || cur_end < cur_start)) {
         qemu_printf("[DETECTED OVERFLOW!] ");
     }
 
@@ -3462,7 +3462,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
     }
 
     QTAILQ_FOREACH(ml, &submr_print_queue, mrqueue) {
-        mtree_print_mr(ml->mr, level + 1, cur_start,
+        mtree_print_mr(ml->mr, level + 1, cur_start, true,
                        alias_print_queue, owner, display_disabled);
     }
 
@@ -3641,7 +3641,8 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
     struct AddressSpaceInfo *asi = user_data;
 
     g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
-    mtree_print_mr(mr, 1, 0, asi->ml_head, asi->owner, asi->disabled);
+    mtree_print_mr(mr, 1, -mr->addr, false,
+                   asi->ml_head, asi->owner, asi->disabled);
     qemu_printf("\n");
 }
 
@@ -3688,7 +3689,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
         const MemoryRegion *mr = ml->mr;
 
         qemu_printf("memory-region: %s\n", memory_region_name(mr));
-        mtree_print_mr(mr, 1, 0, &ml_head, owner, disabled);
+        mtree_print_mr(mr, 1, 0, false, &ml_head, owner, disabled);
         qemu_printf("\n");
     }
 
-- 
2.52.0

Re: [PATCH 5/7] system/memory: Display address spaces starting at 0x0000.0000

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> Since AddressSpace root MemoryRegion can be remapped, it is
> bogus to use the MemoryRegion address as the AddressSpace
> absolute address. Besides, the AddressSpace APIs take an
> @addr argument expecting AddressSpaces start at 0x0000.0000.
> 
> Substract the MemoryRegion address in mtree_print_mr() to
> display AddressSpaces starting at 0x0000.0000.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   system/memory.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 5/7] system/memory: Display address spaces starting at 0x0000.0000

[Peter Xu]

Hi, Phil!

On Thu, Feb 26, 2026 at 11:02:23PM +0100, Philippe Mathieu-Daudé wrote:
> Since AddressSpace root MemoryRegion can be remapped, it is
> bogus to use the MemoryRegion address as the AddressSpace
> absolute address. Besides, the AddressSpace APIs take an
> @addr argument expecting AddressSpaces start at 0x0000.0000.

Could you share an example where a root MR can have addr!=0, and be
remapped while being the root MR of an AS?

Thanks,

> 
> Substract the MemoryRegion address in mtree_print_mr() to
> display AddressSpaces starting at 0x0000.0000.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  system/memory.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/system/memory.c b/system/memory.c
> index d5060774834..1106f48d0d5 100644
> --- a/system/memory.c
> +++ b/system/memory.c
> @@ -3360,7 +3360,7 @@ static void mtree_print_mr_owner(const MemoryRegion *mr)
>  }
>  
>  static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
> -                           hwaddr base,
> +                           hwaddr offset, bool detect_overflow,
>                             MemoryRegionListHead *alias_print_queue,
>                             bool owner, bool display_disabled)
>  {
> @@ -3374,7 +3374,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
>          return;
>      }
>  
> -    cur_start = base + mr->addr;
> +    cur_start = mr->addr + offset;
>      cur_end = cur_start + MR_SIZE(mr->size);
>  
>      /*
> @@ -3382,7 +3382,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
>       * happen normally. When it happens, we dump something to warn the
>       * user who is observing this.
>       */
> -    if (cur_start < base || cur_end < cur_start) {
> +    if (detect_overflow && (cur_start < offset || cur_end < cur_start)) {
>          qemu_printf("[DETECTED OVERFLOW!] ");
>      }
>  
> @@ -3462,7 +3462,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
>      }
>  
>      QTAILQ_FOREACH(ml, &submr_print_queue, mrqueue) {
> -        mtree_print_mr(ml->mr, level + 1, cur_start,
> +        mtree_print_mr(ml->mr, level + 1, cur_start, true,
>                         alias_print_queue, owner, display_disabled);
>      }
>  
> @@ -3641,7 +3641,8 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
>      struct AddressSpaceInfo *asi = user_data;
>  
>      g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
> -    mtree_print_mr(mr, 1, 0, asi->ml_head, asi->owner, asi->disabled);
> +    mtree_print_mr(mr, 1, -mr->addr, false,
> +                   asi->ml_head, asi->owner, asi->disabled);
>      qemu_printf("\n");
>  }
>  
> @@ -3688,7 +3689,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
>          const MemoryRegion *mr = ml->mr;
>  
>          qemu_printf("memory-region: %s\n", memory_region_name(mr));
> -        mtree_print_mr(mr, 1, 0, &ml_head, owner, disabled);
> +        mtree_print_mr(mr, 1, 0, false, &ml_head, owner, disabled);
>          qemu_printf("\n");
>      }
>  
> -- 
> 2.52.0
> 

-- 
Peter Xu

[PATCH 6/7] system/memory: Allow mtree_print_mr() to display distinct address width

[Philippe Mathieu-Daudé]

mtree_print_mr() display addresses using 16 chars on 64-bit
binaries, and 8 chars on 32-bit ones. Some MR / AS don't
always benefit of 16 chars, for example the ISA I/O region
fits in 16 bits, and displaying 12 extra '0' in 64-bit
binaries isn't really a good user experience.

Add an extra @width argument to mtree_print_mr(). Next
commit will make use of it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 system/memory.c | 48 +++++++++++++++++++++++++++---------------------
 1 file changed, 27 insertions(+), 21 deletions(-)

diff --git a/system/memory.c b/system/memory.c
index 1106f48d0d5..4d276307da5 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -3321,6 +3321,7 @@ typedef QTAILQ_HEAD(, MemoryRegionList) MemoryRegionListHead;
 
 #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
                            int128_sub((size), int128_one())) : 0)
+#define MR_ADDR_WIDTH   16
 #define MTREE_INDENT "  "
 
 static void mtree_expand_owner(const char *label, Object *obj)
@@ -3360,6 +3361,7 @@ static void mtree_print_mr_owner(const MemoryRegion *mr)
 }
 
 static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
+                           unsigned int width,
                            hwaddr offset, bool detect_overflow,
                            MemoryRegionListHead *alias_print_queue,
                            bool owner, bool display_disabled)
@@ -3405,17 +3407,17 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
             for (i = 0; i < level; i++) {
                 qemu_printf(MTREE_INDENT);
             }
-            qemu_printf(HWADDR_FMT_plx "-" HWADDR_FMT_plx
-                        " (prio %d, %s%s): alias %s @%s " HWADDR_FMT_plx
-                        "-" HWADDR_FMT_plx "%s",
-                        cur_start, cur_end,
+            qemu_printf("%0*" PRIx64 "-" "%0*" PRIx64
+                        " (prio %d, %s%s): alias %s @%s "
+                        "%0*" PRIx64"-" "%0*" PRIx64 "%s",
+                        width, cur_start, width, cur_end,
                         mr->priority,
                         mr->nonvolatile ? "nv-" : "",
                         memory_region_type((MemoryRegion *)mr),
                         memory_region_name(mr),
                         memory_region_name(mr->alias),
-                        mr->alias_offset,
-                        mr->alias_offset + MR_SIZE(mr->size),
+                        width, mr->alias_offset,
+                        width, mr->alias_offset + MR_SIZE(mr->size),
                         mr->enabled ? "" : " [disabled]");
             if (owner) {
                 mtree_print_mr_owner(mr);
@@ -3427,9 +3429,9 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
             for (i = 0; i < level; i++) {
                 qemu_printf(MTREE_INDENT);
             }
-            qemu_printf(HWADDR_FMT_plx "-" HWADDR_FMT_plx
+            qemu_printf("%0*" PRIx64 "-" "%0*" PRIx64
                         " (prio %d, %s%s): %s%s",
-                        cur_start, cur_end,
+                        width, cur_start, width, cur_end,
                         mr->priority,
                         mr->nonvolatile ? "nv-" : "",
                         memory_region_type((MemoryRegion *)mr),
@@ -3462,7 +3464,7 @@ static void mtree_print_mr(const MemoryRegion *mr, unsigned int level,
     }
 
     QTAILQ_FOREACH(ml, &submr_print_queue, mrqueue) {
-        mtree_print_mr(ml->mr, level + 1, cur_start, true,
+        mtree_print_mr(ml->mr, level + 1, width, cur_start, true,
                        alias_print_queue, owner, display_disabled);
     }
 
@@ -3485,6 +3487,7 @@ static void mtree_print_flatview(gpointer key, gpointer value,
     GArray *fv_address_spaces = value;
     struct FlatViewInfo *fvi = user_data;
     FlatRange *range = &view->ranges[0];
+    unsigned int width;
     int n = view->nr;
     int i;
     AddressSpace *as;
@@ -3510,26 +3513,27 @@ static void mtree_print_flatview(gpointer key, gpointer value,
         return;
     }
 
+    width = MR_ADDR_WIDTH;
     while (n--) {
         const MemoryRegion *mr = range->mr;
 
         if (range->offset_in_region) {
-            qemu_printf(MTREE_INDENT HWADDR_FMT_plx "-" HWADDR_FMT_plx
-                        " (prio %d, %s%s): %s @" HWADDR_FMT_plx,
-                        int128_get64(range->addr.start),
-                        int128_get64(range->addr.start)
-                        + MR_SIZE(range->addr.size),
+            qemu_printf(MTREE_INDENT "%0*" PRIx64 "-" "%0*" PRIx64
+                        " (prio %d, %s%s): %s @" "%0*" PRIx64,
+                        width, int128_get64(range->addr.start),
+                        width, int128_get64(range->addr.start)
+                                + MR_SIZE(range->addr.size),
                         mr->priority,
                         range->nonvolatile ? "nv-" : "",
                         range->readonly ? "rom" : memory_region_type(mr),
                         memory_region_name(mr),
-                        range->offset_in_region);
+                        width, range->offset_in_region);
         } else {
-            qemu_printf(MTREE_INDENT HWADDR_FMT_plx "-" HWADDR_FMT_plx
+            qemu_printf(MTREE_INDENT "%0*" PRIx64 "-" "%0*" PRIx64
                         " (prio %d, %s%s): %s",
-                        int128_get64(range->addr.start),
-                        int128_get64(range->addr.start)
-                        + MR_SIZE(range->addr.size),
+                        width, int128_get64(range->addr.start),
+                        width, int128_get64(range->addr.start)
+                               + MR_SIZE(range->addr.size),
                         mr->priority,
                         range->nonvolatile ? "nv-" : "",
                         range->readonly ? "rom" : memory_region_type(mr),
@@ -3639,9 +3643,10 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
     MemoryRegion *mr = key;
     GSList *as_same_root_mr_list = value;
     struct AddressSpaceInfo *asi = user_data;
+    const unsigned int width = MR_ADDR_WIDTH;
 
     g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
-    mtree_print_mr(mr, 1, -mr->addr, false,
+    mtree_print_mr(mr, 1, width, -mr->addr, false,
                    asi->ml_head, asi->owner, asi->disabled);
     qemu_printf("\n");
 }
@@ -3687,9 +3692,10 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
     /* print aliased regions */
     QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
         const MemoryRegion *mr = ml->mr;
+        const unsigned int width = MR_ADDR_WIDTH;
 
         qemu_printf("memory-region: %s\n", memory_region_name(mr));
-        mtree_print_mr(mr, 1, 0, false, &ml_head, owner, disabled);
+        mtree_print_mr(mr, 1, width, 0, false, &ml_head, owner, disabled);
         qemu_printf("\n");
     }
 
-- 
2.52.0

Re: [PATCH 6/7] system/memory: Allow mtree_print_mr() to display distinct address width

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> mtree_print_mr() display addresses using 16 chars on 64-bit
> binaries, and 8 chars on 32-bit ones. Some MR / AS don't
> always benefit of 16 chars, for example the ISA I/O region
> fits in 16 bits, and displaying 12 extra '0' in 64-bit
> binaries isn't really a good user experience.
> 
> Add an extra @width argument to mtree_print_mr(). Next
> commit will make use of it.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   system/memory.c | 48 +++++++++++++++++++++++++++---------------------
>   1 file changed, 27 insertions(+), 21 deletions(-)
> 

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 6/7] system/memory: Allow mtree_print_mr() to display distinct address width

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:24PM +0100, Philippe Mathieu-Daudé wrote:
> mtree_print_mr() display addresses using 16 chars on 64-bit
> binaries, and 8 chars on 32-bit ones. Some MR / AS don't
> always benefit of 16 chars, for example the ISA I/O region
> fits in 16 bits, and displaying 12 extra '0' in 64-bit
> binaries isn't really a good user experience.
> 
> Add an extra @width argument to mtree_print_mr(). Next
> commit will make use of it.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu

[PATCH 7/7] system/memory: Have 'info mtree' display addresses nicely

[Philippe Mathieu-Daudé]

Use the size of a MR / AS to decide how many address chars
need to be used.

For example, using 'qemu-system-x86_64 -M q35 -S -monitor stdio'
to run 'info mtree' displays before:

  address-space: I/O
    0000000000000000-000000000000ffff (prio 0, i/o): io
        0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
        0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
        0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
        0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
        0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
        0000000000000060-000000000000007f (prio 0, i/o): sm-tco
      0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
      0000000000000008-000000000000000f (prio 0, i/o): dma-cont
      0000000000000020-0000000000000021 (prio 0, i/o): pic
      0000000000000040-0000000000000043 (prio 0, i/o): pit
      ...
  memory-region: pc.ram
    0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
  memory-region: pc.bios
    00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
  memory-region: pci
    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
  ...

and after:

  address-space: I/O
    0000-ffff (prio 0, container): io
        0000-0003 (prio 0, i/o): acpi-evt
        0004-0005 (prio 0, i/o): acpi-cnt
        0008-000b (prio 0, i/o): acpi-tmr
        0020-002f (prio 0, i/o): acpi-gpe0
        0030-0037 (prio 0, i/o): acpi-smi
        0060-007f (prio 0, i/o): sm-tco
      0000-0007 (prio 0, i/o): dma-chan
      0008-000f (prio 0, i/o): dma-cont
      0020-0021 (prio 0, i/o): pic
      0040-0043 (prio 0, i/o): pit
      ...
  memory-region: pc.ram
    00000000-07ffffff (prio 0, ram): pc.ram
  memory-region: pc.bios
    fffc0000-ffffffff (prio 0, rom): pc.bios
  memory-region: pci
    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
  ...

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 system/memory.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/system/memory.c b/system/memory.c
index 4d276307da5..abcbdaadcd7 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -3321,7 +3321,26 @@ typedef QTAILQ_HEAD(, MemoryRegionList) MemoryRegionListHead;
 
 #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
                            int128_sub((size), int128_one())) : 0)
-#define MR_ADDR_WIDTH   16
+
+static unsigned mr_addr_fmt_width(const MemoryRegion *mr)
+{
+    const unsigned int bits = 127 - clz128(mr->size);
+    unsigned int width;
+
+    if (bits <= 8) {
+        width = 2;
+    } else if (bits <= 16) {
+        width = 4;
+    } else if (bits <= 32) {
+        width = 8;
+    } else if (bits <= 64) {
+        width = 16;
+    } else {
+        width = 20;
+    }
+    return width;
+}
+
 #define MTREE_INDENT "  "
 
 static void mtree_expand_owner(const char *label, Object *obj)
@@ -3513,7 +3532,7 @@ static void mtree_print_flatview(gpointer key, gpointer value,
         return;
     }
 
-    width = MR_ADDR_WIDTH;
+    width = mr_addr_fmt_width(view->root);
     while (n--) {
         const MemoryRegion *mr = range->mr;
 
@@ -3643,7 +3662,7 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
     MemoryRegion *mr = key;
     GSList *as_same_root_mr_list = value;
     struct AddressSpaceInfo *asi = user_data;
-    const unsigned int width = MR_ADDR_WIDTH;
+    const unsigned int width = mr_addr_fmt_width(mr);
 
     g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
     mtree_print_mr(mr, 1, width, -mr->addr, false,
@@ -3692,7 +3711,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
     /* print aliased regions */
     QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
         const MemoryRegion *mr = ml->mr;
-        const unsigned int width = MR_ADDR_WIDTH;
+        const unsigned int width = mr_addr_fmt_width(mr);
 
         qemu_printf("memory-region: %s\n", memory_region_name(mr));
         mtree_print_mr(mr, 1, width, 0, false, &ml_head, owner, disabled);
-- 
2.52.0

Re: [PATCH 7/7] system/memory: Have 'info mtree' display addresses nicely

[Pierrick Bouvier]

On 2/26/26 2:02 PM, Philippe Mathieu-Daudé wrote:
> Use the size of a MR / AS to decide how many address chars
> need to be used.
> 
> For example, using 'qemu-system-x86_64 -M q35 -S -monitor stdio'
> to run 'info mtree' displays before:
> 
>    address-space: I/O
>      0000000000000000-000000000000ffff (prio 0, i/o): io
>          0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
>          0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
>          0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
>          0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
>          0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
>          0000000000000060-000000000000007f (prio 0, i/o): sm-tco
>        0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
>        0000000000000008-000000000000000f (prio 0, i/o): dma-cont
>        0000000000000020-0000000000000021 (prio 0, i/o): pic
>        0000000000000040-0000000000000043 (prio 0, i/o): pit
>        ...
>    memory-region: pc.ram
>      0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
>    memory-region: pc.bios
>      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>    memory-region: pci
>      0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>        00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>        00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>        00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>        00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>    ...
> 
> and after:
> 
>    address-space: I/O
>      0000-ffff (prio 0, container): io
>          0000-0003 (prio 0, i/o): acpi-evt
>          0004-0005 (prio 0, i/o): acpi-cnt
>          0008-000b (prio 0, i/o): acpi-tmr
>          0020-002f (prio 0, i/o): acpi-gpe0
>          0030-0037 (prio 0, i/o): acpi-smi
>          0060-007f (prio 0, i/o): sm-tco
>        0000-0007 (prio 0, i/o): dma-chan
>        0008-000f (prio 0, i/o): dma-cont
>        0020-0021 (prio 0, i/o): pic
>        0040-0043 (prio 0, i/o): pit
>        ...
>    memory-region: pc.ram
>      00000000-07ffffff (prio 0, ram): pc.ram
>    memory-region: pc.bios
>      fffc0000-ffffffff (prio 0, rom): pc.bios
>    memory-region: pci
>      0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>        00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>        00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>        00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>        00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>    ...
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   system/memory.c | 27 +++++++++++++++++++++++----
>   1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/system/memory.c b/system/memory.c
> index 4d276307da5..abcbdaadcd7 100644
> --- a/system/memory.c
> +++ b/system/memory.c
> @@ -3321,7 +3321,26 @@ typedef QTAILQ_HEAD(, MemoryRegionList) MemoryRegionListHead;
>   
>   #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
>                              int128_sub((size), int128_one())) : 0)
> -#define MR_ADDR_WIDTH   16
> +
> +static unsigned mr_addr_fmt_width(const MemoryRegion *mr)
> +{
> +    const unsigned int bits = 127 - clz128(mr->size);
> +    unsigned int width;
> +
> +    if (bits <= 8) {
> +        width = 2;
> +    } else if (bits <= 16) {
> +        width = 4;
> +    } else if (bits <= 32) {
> +        width = 8;
> +    } else if (bits <= 64) {
> +        width = 16;
> +    } else {
> +        width = 20;
> +    }
> +    return width;
> +}
> +
>   #define MTREE_INDENT "  "
>   
>   static void mtree_expand_owner(const char *label, Object *obj)
> @@ -3513,7 +3532,7 @@ static void mtree_print_flatview(gpointer key, gpointer value,
>           return;
>       }
>   
> -    width = MR_ADDR_WIDTH;
> +    width = mr_addr_fmt_width(view->root);
>       while (n--) {
>           const MemoryRegion *mr = range->mr;
>   
> @@ -3643,7 +3662,7 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
>       MemoryRegion *mr = key;
>       GSList *as_same_root_mr_list = value;
>       struct AddressSpaceInfo *asi = user_data;
> -    const unsigned int width = MR_ADDR_WIDTH;
> +    const unsigned int width = mr_addr_fmt_width(mr);
>   
>       g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
>       mtree_print_mr(mr, 1, width, -mr->addr, false,
> @@ -3692,7 +3711,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
>       /* print aliased regions */
>       QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
>           const MemoryRegion *mr = ml->mr;
> -        const unsigned int width = MR_ADDR_WIDTH;
> +        const unsigned int width = mr_addr_fmt_width(mr);
>   
>           qemu_printf("memory-region: %s\n", memory_region_name(mr));
>           mtree_print_mr(mr, 1, width, 0, false, &ml_head, owner, disabled);

That is so neat!
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Re: [PATCH 7/7] system/memory: Have 'info mtree' display addresses nicely

[BALATON Zoltan]

[-- Attachment #1: Type: text/plain, Size: 4981 bytes --]

On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
> Use the size of a MR / AS to decide how many address chars
> need to be used.
>
> For example, using 'qemu-system-x86_64 -M q35 -S -monitor stdio'
> to run 'info mtree' displays before:
>
>  address-space: I/O
>    0000000000000000-000000000000ffff (prio 0, i/o): io
>        0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
>        0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
>        0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
>        0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
>        0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
>        0000000000000060-000000000000007f (prio 0, i/o): sm-tco
>      0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
>      0000000000000008-000000000000000f (prio 0, i/o): dma-cont
>      0000000000000020-0000000000000021 (prio 0, i/o): pic
>      0000000000000040-0000000000000043 (prio 0, i/o): pit
>      ...
>  memory-region: pc.ram
>    0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
>  memory-region: pc.bios
>    00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>  memory-region: pci
>    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>  ...
>
> and after:
>
>  address-space: I/O
>    0000-ffff (prio 0, container): io
>        0000-0003 (prio 0, i/o): acpi-evt
>        0004-0005 (prio 0, i/o): acpi-cnt
>        0008-000b (prio 0, i/o): acpi-tmr
>        0020-002f (prio 0, i/o): acpi-gpe0
>        0030-0037 (prio 0, i/o): acpi-smi
>        0060-007f (prio 0, i/o): sm-tco
>      0000-0007 (prio 0, i/o): dma-chan
>      0008-000f (prio 0, i/o): dma-cont
>      0020-0021 (prio 0, i/o): pic
>      0040-0043 (prio 0, i/o): pit
>      ...
>  memory-region: pc.ram
>    00000000-07ffffff (prio 0, ram): pc.ram
>  memory-region: pc.bios
>    fffc0000-ffffffff (prio 0, rom): pc.bios
>  memory-region: pci
>    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>  ...
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
> system/memory.c | 27 +++++++++++++++++++++++----
> 1 file changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/system/memory.c b/system/memory.c
> index 4d276307da5..abcbdaadcd7 100644
> --- a/system/memory.c
> +++ b/system/memory.c
> @@ -3321,7 +3321,26 @@ typedef QTAILQ_HEAD(, MemoryRegionList) MemoryRegionListHead;
>
> #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
>                            int128_sub((size), int128_one())) : 0)
> -#define MR_ADDR_WIDTH   16
> +
> +static unsigned mr_addr_fmt_width(const MemoryRegion *mr)
> +{
> +    const unsigned int bits = 127 - clz128(mr->size);
> +    unsigned int width;
> +
> +    if (bits <= 8) {
> +        width = 2;
> +    } else if (bits <= 16) {
> +        width = 4;
> +    } else if (bits <= 32) {
> +        width = 8;
> +    } else if (bits <= 64) {
> +        width = 16;
> +    } else {
> +        width = 20;

Why 20? HWADDR_FMT_plx this seems to replace is "%016" PRIx64

Regards,
BALATON Zoltan

> +    }
> +    return width;
> +}
> +
> #define MTREE_INDENT "  "
>
> static void mtree_expand_owner(const char *label, Object *obj)
> @@ -3513,7 +3532,7 @@ static void mtree_print_flatview(gpointer key, gpointer value,
>         return;
>     }
>
> -    width = MR_ADDR_WIDTH;
> +    width = mr_addr_fmt_width(view->root);
>     while (n--) {
>         const MemoryRegion *mr = range->mr;
>
> @@ -3643,7 +3662,7 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
>     MemoryRegion *mr = key;
>     GSList *as_same_root_mr_list = value;
>     struct AddressSpaceInfo *asi = user_data;
> -    const unsigned int width = MR_ADDR_WIDTH;
> +    const unsigned int width = mr_addr_fmt_width(mr);
>
>     g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
>     mtree_print_mr(mr, 1, width, -mr->addr, false,
> @@ -3692,7 +3711,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
>     /* print aliased regions */
>     QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
>         const MemoryRegion *mr = ml->mr;
> -        const unsigned int width = MR_ADDR_WIDTH;
> +        const unsigned int width = mr_addr_fmt_width(mr);
>
>         qemu_printf("memory-region: %s\n", memory_region_name(mr));
>         mtree_print_mr(mr, 1, width, 0, false, &ml_head, owner, disabled);
>

Re: [PATCH 7/7] system/memory: Have 'info mtree' display addresses nicely

[Philippe Mathieu-Daudé]

Hi Zoltan,

On 26/2/26 23:35, BALATON Zoltan wrote:
> On Thu, 26 Feb 2026, Philippe Mathieu-Daudé wrote:
>> Use the size of a MR / AS to decide how many address chars
>> need to be used.
>>
>> For example, using 'qemu-system-x86_64 -M q35 -S -monitor stdio'
>> to run 'info mtree' displays before:
>>
>>  address-space: I/O
>>    0000000000000000-000000000000ffff (prio 0, i/o): io
>>        0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
>>        0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
>>        0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
>>        0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
>>        0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
>>        0000000000000060-000000000000007f (prio 0, i/o): sm-tco
>>      0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
>>      0000000000000008-000000000000000f (prio 0, i/o): dma-cont
>>      0000000000000020-0000000000000021 (prio 0, i/o): pic
>>      0000000000000040-0000000000000043 (prio 0, i/o): pit
>>      ...
>>  memory-region: pc.ram
>>    0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
>>  memory-region: pc.bios
>>    00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>>  memory-region: pci
>>    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>>      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>>      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>>      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios 
>> @pc.bios 0000000000020000-000000000003ffff
>>      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>>  ...
>>
>> and after:
>>
>>  address-space: I/O
>>    0000-ffff (prio 0, container): io
>>        0000-0003 (prio 0, i/o): acpi-evt
>>        0004-0005 (prio 0, i/o): acpi-cnt
>>        0008-000b (prio 0, i/o): acpi-tmr
>>        0020-002f (prio 0, i/o): acpi-gpe0
>>        0030-0037 (prio 0, i/o): acpi-smi
>>        0060-007f (prio 0, i/o): sm-tco
>>      0000-0007 (prio 0, i/o): dma-chan
>>      0008-000f (prio 0, i/o): dma-cont
>>      0020-0021 (prio 0, i/o): pic
>>      0040-0043 (prio 0, i/o): pit
>>      ...
>>  memory-region: pc.ram
>>    00000000-07ffffff (prio 0, ram): pc.ram
>>  memory-region: pc.bios
>>    fffc0000-ffffffff (prio 0, rom): pc.bios
>>  memory-region: pci
>>    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>>      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>>      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>>      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios 
>> @pc.bios 0000000000020000-000000000003ffff
>>      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>>  ...
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>> ---
>> system/memory.c | 27 +++++++++++++++++++++++----
>> 1 file changed, 23 insertions(+), 4 deletions(-)
>>
>> diff --git a/system/memory.c b/system/memory.c
>> index 4d276307da5..abcbdaadcd7 100644
>> --- a/system/memory.c
>> +++ b/system/memory.c
>> @@ -3321,7 +3321,26 @@ typedef QTAILQ_HEAD(, MemoryRegionList) 
>> MemoryRegionListHead;
>>
>> #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
>>                            int128_sub((size), int128_one())) : 0)
>> -#define MR_ADDR_WIDTH   16
>> +
>> +static unsigned mr_addr_fmt_width(const MemoryRegion *mr)
>> +{
>> +    const unsigned int bits = 127 - clz128(mr->size);
>> +    unsigned int width;
>> +
>> +    if (bits <= 8) {
>> +        width = 2;
>> +    } else if (bits <= 16) {
>> +        width = 4;
>> +    } else if (bits <= 32) {
>> +        width = 8;
>> +    } else if (bits <= 64) {
>> +        width = 16;
>> +    } else {
>> +        width = 20;
> 
> Why 20? HWADDR_FMT_plx this seems to replace is "%016" PRIx64

HWADDR_FMT_plx predates support for int128_t and 128-bit wide
addresses. Using 20 chars is sufficient to align our current
uses.

I'll precise that in the patch description.

Regards,

Phil.

> 
> Regards,
> BALATON Zoltan

Re: [PATCH 7/7] system/memory: Have 'info mtree' display addresses nicely

[Peter Xu]

On Thu, Feb 26, 2026 at 11:02:25PM +0100, Philippe Mathieu-Daudé wrote:
> Use the size of a MR / AS to decide how many address chars
> need to be used.
> 
> For example, using 'qemu-system-x86_64 -M q35 -S -monitor stdio'
> to run 'info mtree' displays before:
> 
>   address-space: I/O
>     0000000000000000-000000000000ffff (prio 0, i/o): io
>         0000000000000000-0000000000000003 (prio 0, i/o): acpi-evt
>         0000000000000004-0000000000000005 (prio 0, i/o): acpi-cnt
>         0000000000000008-000000000000000b (prio 0, i/o): acpi-tmr
>         0000000000000020-000000000000002f (prio 0, i/o): acpi-gpe0
>         0000000000000030-0000000000000037 (prio 0, i/o): acpi-smi
>         0000000000000060-000000000000007f (prio 0, i/o): sm-tco
>       0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
>       0000000000000008-000000000000000f (prio 0, i/o): dma-cont
>       0000000000000020-0000000000000021 (prio 0, i/o): pic
>       0000000000000040-0000000000000043 (prio 0, i/o): pit
>       ...
>   memory-region: pc.ram
>     0000000000000000-0000000007ffffff (prio 0, ram): pc.ram
>   memory-region: pc.bios
>     00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>   memory-region: pci
>     0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>       00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>       00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>       00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>       00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>   ...
> 
> and after:
> 
>   address-space: I/O
>     0000-ffff (prio 0, container): io
>         0000-0003 (prio 0, i/o): acpi-evt
>         0004-0005 (prio 0, i/o): acpi-cnt
>         0008-000b (prio 0, i/o): acpi-tmr
>         0020-002f (prio 0, i/o): acpi-gpe0
>         0030-0037 (prio 0, i/o): acpi-smi
>         0060-007f (prio 0, i/o): sm-tco
>       0000-0007 (prio 0, i/o): dma-chan
>       0008-000f (prio 0, i/o): dma-cont
>       0020-0021 (prio 0, i/o): pic
>       0040-0043 (prio 0, i/o): pit
>       ...
>   memory-region: pc.ram
>     00000000-07ffffff (prio 0, ram): pc.ram
>   memory-region: pc.bios
>     fffc0000-ffffffff (prio 0, rom): pc.bios
>   memory-region: pci
>     0000000000000000-ffffffffffffffff (prio -1, i/o): pci
>       00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
>       00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
>       00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
>       00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
>   ...
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  system/memory.c | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/system/memory.c b/system/memory.c
> index 4d276307da5..abcbdaadcd7 100644
> --- a/system/memory.c
> +++ b/system/memory.c
> @@ -3321,7 +3321,26 @@ typedef QTAILQ_HEAD(, MemoryRegionList) MemoryRegionListHead;
>  
>  #define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
>                             int128_sub((size), int128_one())) : 0)
> -#define MR_ADDR_WIDTH   16
> +
> +static unsigned mr_addr_fmt_width(const MemoryRegion *mr)
> +{
> +    const unsigned int bits = 127 - clz128(mr->size);
> +    unsigned int width;
> +
> +    if (bits <= 8) {
> +        width = 2;
> +    } else if (bits <= 16) {
> +        width = 4;
> +    } else if (bits <= 32) {
> +        width = 8;
> +    } else if (bits <= 64) {
> +        width = 16;
> +    } else {
> +        width = 20;

Is there any case this can happen?  I thought we don't have MR larger than
1<<64.  Not a huge deal, though.

Reviewed-by: Peter Xu <peterx@redhat.com>

> +    }
> +    return width;
> +}
> +
>  #define MTREE_INDENT "  "
>  
>  static void mtree_expand_owner(const char *label, Object *obj)
> @@ -3513,7 +3532,7 @@ static void mtree_print_flatview(gpointer key, gpointer value,
>          return;
>      }
>  
> -    width = MR_ADDR_WIDTH;
> +    width = mr_addr_fmt_width(view->root);
>      while (n--) {
>          const MemoryRegion *mr = range->mr;
>  
> @@ -3643,7 +3662,7 @@ static void mtree_print_as(gpointer key, gpointer value, gpointer user_data)
>      MemoryRegion *mr = key;
>      GSList *as_same_root_mr_list = value;
>      struct AddressSpaceInfo *asi = user_data;
> -    const unsigned int width = MR_ADDR_WIDTH;
> +    const unsigned int width = mr_addr_fmt_width(mr);
>  
>      g_slist_foreach(as_same_root_mr_list, mtree_print_as_name, NULL);
>      mtree_print_mr(mr, 1, width, -mr->addr, false,
> @@ -3692,7 +3711,7 @@ static void mtree_info_as(bool dispatch_tree, bool owner, bool disabled)
>      /* print aliased regions */
>      QTAILQ_FOREACH(ml, &ml_head, mrqueue) {
>          const MemoryRegion *mr = ml->mr;
> -        const unsigned int width = MR_ADDR_WIDTH;
> +        const unsigned int width = mr_addr_fmt_width(mr);
>  
>          qemu_printf("memory-region: %s\n", memory_region_name(mr));
>          mtree_print_mr(mr, 1, width, 0, false, &ml_head, owner, disabled);
> -- 
> 2.52.0
> 

-- 
Peter Xu