Re: [PATCH V4] KVM: SEV: fix wrong pinning of pages

[David Hildenbrand]

On 11.02.25 03:37, yangge1116@xxxxxxx wrote:
> From: Ge Yang <yangge1116@xxxxxxx>
>
> In the sev_mem_enc_register_region() function, we need to call
> sev_pin_memory() to pin memory for the long term. However, when
> calling sev_pin_memory(), the FOLL_LONGTERM flag is not passed, causing
> the allocated pages not to be migrated out of MIGRATE_CMA/ZONE_MOVABLE,
> violating these mechanisms to avoid fragmentation with unmovable pages,
> for example making CMA allocations fail.
>
> To address the aforementioned problem, we should add the FOLL_LONGTERM
> flag when calling sev_pin_memory() within the sev_mem_enc_register_region()
> function.
>
> Signed-off-by: Ge Yang <yangge1116@xxxxxxx>
> Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb