Re: [PATCH 5.15.y] drm/amdkfd: don't allow mapping the MMIO HDP page with large pages

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Aug 15, 2024 at 03:46:29PM -0400, Felix Kuehling wrote:
> From: Alex Deucher <alexander.deucher@amd.com>
> 
> We don't get the right offset in that case.  The GPU has
> an unused 4K area of the register BAR space into which you can
> remap registers.  We remap the HDP flush registers into this
> space to allow userspace (CPU or GPU) to flush the HDP when it
> updates VRAM.  However, on systems with >4K pages, we end up
> exposing PAGE_SIZE of MMIO space.
> 
> Fixes: d8e408a82704 ("drm/amdkfd: Expose HDP registers to user space")
> Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> Cc: stable@vger.kernel.org
> (cherry picked from commit 24e82654e98e96cece5d8b919c522054456eeec6)

Wrong git id, this should be be4a2a81b6b9 ("drm/amdkfd: don't allow
mapping the MMIO HDP page with large pages"), right?

{sigh}