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Re: [PATCH] x86/PVH: correct PVH Dom0 E820 region merge
- To: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Oct 2026 07:56:02 +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, 06 Oct 2026 05:56:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.10.2026 18:19, Roger Pau Monné wrote:
> On Mon, Oct 05, 2026 at 06:01:34PM +0200, Jan Beulich wrote:
>> Folding with an immediately successive region can't be done by merely
>> lowering the start of the region. The size of the region needs increasing
>> as well.
>>
>> Fixes: 5427134eae81 ("x86: populate PVHv2 Dom0 physical memory map")
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> My bad...
>
> Reviewed-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
Thanks.
>> --- a/xen/arch/x86/hvm/dom0_build.c
>> +++ b/xen/arch/x86/hvm/dom0_build.c
>> @@ -229,6 +229,7 @@ static int __init pvh_add_mem_range(stru
>> if ( rs == e && d->arch.e820[i].type == type )
>> {
>> d->arch.e820[i].addr = s;
>> + d->arch.e820[i].size += e - s;
>
> I think it would be simpler as:
>
> d->arch.e820[i].size = re - s;
Perhaps, but the way I have it the compiler may figure that it can fold
the tail of this path with the next if()'s body.
Jan
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