On Mon, Aug 26, 2019 at 1:18 AM Seunghun Han <kkamagui@xxxxxxxxx> wrote: > To support AMD's fTPM, I removed the busy bit from the ACPI NVS area like > the reserved area so that AMD's fTPM regions could be assigned in it. drivers/acpi/nvs.c saves and restores the contents of NVS regions, and if other drivers use these regions without any awareness of this then things may break. I'm reluctant to say that just unilaterally marking these regions as available is a good thing, but it's clearly what's expected by AMD's implementation. One approach would be to have a callback into the nvs code to indicate that a certain region should be handed off to a driver, which would ensure that we can handle this on a case by case basis?
