Thanks for the confirmation.
I am using remap_pfn_range(). I can use alloc_pages() instead of kmalloc().
I am using remap_pfn_range(). I can use alloc_pages() instead of kmalloc().
On Thu, Apr 25, 2024 at 3:06 PM David Hildenbrand <david@xxxxxxxxxx> wrote:
On 25.04.24 11:21, Mounesh Badiger wrote:
> Hi,
Hi,
>
> We have a device driver that allocates physical pages using kmalloc()
> and these pages are mapped to the userspace process via mmap.
Which interface are you using for inserting these pages into the page
tables?
remap_pfn_range? vm_insert_page() ? ...
Using kmalloc sound weird ... why not simply alloc_pages()?
>
> Does the kmalloc()'ed memory mapped to userspace can migrate or get
> remapped due to any of kernel mm operations?
No.
>
> we are looking to keep VA->PA mapping intact from a
> userspace process point of view.
That will work.
--
Cheers,
David / dhildenb
Mounesh Badiger
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