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Re: [PATCH 11/15] x86/PVH: try to map initrd directly into Dom0
- To: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 16 Oct 2026 10:58:09 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 16 Oct 2026 08:58:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.10.2026 19:41, Roger Pau Monné wrote:
> On Mon, Oct 12, 2026 at 10:25:11AM +0200, Jan Beulich wrote:
>> @@ -867,7 +1078,7 @@ static int __init pvh_load_kernel(
>> }
>> start_info.modlist_paddr = last_addr;
>> start_info.nr_modules = 1;
>> - last_addr += sizeof(mod);
>> + last_addr += sizeof(*mod);
>> }
>>
>> start_info.magic = XEN_HVM_START_MAGIC_VALUE;
>
> Isn't this still not properly ordered, as start_info address must
> strictly be below 4GB (as is passed in a CPU register with the CPU in
> 32bit mode), yet it is allocated last in pvh_load_kernel()?
Well. For one, this is pre-existing. With the size of the region that
find_memory() needs to find greatly reduced when the initrd isn't
included there, there's about zero chance that it won't find a suitable
region below 4G. Once we have find_memory() go downwards from 4G, the
remaining little bit of a risk will also go away.
Jan
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