Re: [PULL 00/10] Next patches

On 13/8/26 17:05, Peter Xu wrote:
> On Thu, Aug 13, 2026 at 04:51:39PM +0200, Philippe Mathieu-Daudé wrote:
>> On 13/8/26 16:14, Richard Henderson wrote:
>>> On 8/13/26 06:41, Peter Xu wrote:
>>>> Now when I think about it from the root, I tend to like what Xen defines
>>>> with ram_addr_t:
>>>>
>>>> /* address in the RAM (different from a physical address) */
>>>> #if defined(CONFIG_XEN_BACKEND)
>>>> typedef uint64_t ram_addr_t;
>>>> #  define RAM_ADDR_MAX UINT64_MAX
>>>> #  define RAM_ADDR_FMT "%" PRIx64
>>>> #else
>>>> typedef uintptr_t ram_addr_t;
>>>> #  define RAM_ADDR_MAX UINTPTR_MAX
>>>> #  define RAM_ADDR_FMT "%" PRIxPTR
>>>> #endif
>>>>
>>>> I don't know how we supported 32bit host emulating anything larger, but
>>>> logically it's doable, then IIUC uintptr_t won't be enough allocating
>>>> anything >4G?
>>>
>>> ram_addr_t != hwaddr or vaddr -- it's just an internal token.
>>>
>>> So a 32-bit machine could put 1G of ram (identified by ram_addr_t) at 8G
>>> (hwaddr) just fine.  But obviously it couldn't put 8G of ram anywhere.
>>> :-)
> 
> Yep, I should have described it as allocating >4G in total, rather in one
> shot.  So it's about the address space we can allocate that is limited..
> 
>>>
>>> That said, Xen was weird in that it used to be possible to have an i386
>>> qemu command-line talking to a x86_64 dom0 kernel controlling x86_64
>>> guests.
>>>
>>> So, yeah, now we should drop this ram_addr_t distinction and always use
>>> uint64_t.
>>
>> 🩷🩷🩷 lovely 🩷🩷🩷
> 
> I can throw a patch, just to double check one last thing: we don't support
> any form of 32bit hosts anymore, am I right?

commit 372ec46b9f1215f48a4717f2b7ed969f65bfadc6
Author: Richard Henderson <[email protected]>
Date:   Thu Dec 18 09:56:27 2025 +1100

     meson: Reject 32-bit hosts

     32-bit hosts have been deprecated since 10.0.

diff --git a/docs/about/removed-features.rst 
b/docs/about/removed-features.rst

+32-bit host operating systems (removed in 11.0)
+'''''''''''''''''''''''''''''''''''''''''''''''