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Re: [PATCH 03/15] x86/setup: break out E820_RAM accumulation
- To: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 13 Oct 2026 13:39:24 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Tue, 13 Oct 2026 11:39:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.10.2026 13:05, Roger Pau Monné wrote:
> On Mon, Oct 12, 2026 at 10:20:16AM +0200, Jan Beulich wrote:
>> We already have two instances of this, and we're about to gain a third.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Reviewed-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
Thanks.
>> --- a/xen/arch/x86/setup.c
>> +++ b/xen/arch/x86/setup.c
>> @@ -1007,6 +1007,17 @@ static unsigned int __init copy_bios_e82
>> return n;
>> }
>>
>> +static unsigned long __init nr_ram_pages(void)
>> +{
>> + unsigned long nr_pages = 0;
>> +
>> + for ( unsigned int i = 0; i < e820.nr_map; i++ )
>> + if ( e820.map[i].type == E820_RAM )
>> + nr_pages += e820.map[i].size >> PAGE_SHIFT;
>
> Do we want/need to ensure size is page-aligned here? AFAICT this is
> the sanitized memory map, so it should have all regions aligned to
> page boundaries.
Neither user cares about an entirely exact value, so keeping things
simple looks sufficient.
Jan
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