Re: [PATCH v16 15/16] vfio/type1, arm64: untag user pointers in vaddr_get_pfn

On Mon, Jun 03, 2019 at 06:55:17PM +0200, Andrey Konovalov wrote:

This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments.

vaddr_get_pfn() uses provided user pointers for vma lookups, which can only by done with untagged pointers.

Untag user pointers in this function.

Signed-off-by: Andrey Konovalov andreyknvl@google.com

Reviewed-by: Catalin Marinas catalin.marinas@arm.com