Re: kmalloc() question - migration/remap of kmalloc()'ed pages

[Mounesh Badiger <mounesh.b@gmail.com>]

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Thanks for the confirmation.
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@redhat.com> 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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