Hi all I have a question about IDE TRIM Command.
As you know, QEMU have supported TRIM command since QEMU 0.15.0. Some QEMU disk images such as qcow2 support bdrv_discard function which will be called when guest OS executes ATA TRIM command. So, I think qcow2 image has a function to delete the disk pages which are recognized as discarded by guest OS. I think that to enable TRIM Command, we have to emulate guest HDD as Solid State Drive. However, it seems QEMU does not emulate guest HDD as Solid State Drive. Thus, I think that bdrv_discard functions in qemu images are never called by guest OS. Is my thinking correct? Thanks, Kazushi Takahashi
