On Tue, Nov 16, 2021 at 10:58:30AM +0000, Stefan Hajnoczi wrote: > Question for Jens and Christoph: > > Is there a way for userspace to detect whether a Linux block device > supports SECDISCARD?
I don't know of one. > If not, then maybe a new sysfs attribute can be added: This looks correct, but if we start looking into SECDISCARD seriously I'd like to split the max_sectors settings for it from discard as that is currently a bit of a mess. If we then expose the secure erase max sectors in sysfs that would also be a good indicator. What is the use case for exposing secure erase in qemu? The whole concept for a LBA based secure erase is generally not a very smart idea for flash based media..
