Hi Adrian, This thread seems to be long dead, but I couldn't figure out what happened to the ideas in it. I'm specifically interested in this part: On Wed, Feb 24, 2021 at 9:48 AM Adrian Catangiu <acatan@xxxxxxxxxx> wrote: > +static void vmgenid_acpi_notify(struct acpi_device *device, u32 event) > +{ > + uuid_t old_uuid; > + > + if (!device || acpi_driver_data(device) != &vmgenid_data) { > + pr_err("VMGENID notify with unexpected driver private data\n"); > + return; > + } > + > + /* update VM Generation UUID */ > + old_uuid = vmgenid_data.uuid; > + memcpy_fromio(&vmgenid_data.uuid, vmgenid_data.uuid_iomap, sizeof(uuid_t)); > + > + if (memcmp(&old_uuid, &vmgenid_data.uuid, sizeof(uuid_t))) { > + /* HW uuid updated */ > + sysgenid_bump_generation(); > + add_device_randomness(&vmgenid_data.uuid, sizeof(uuid_t)); > + } > +} As Jann mentioned in an earlier email, we probably want this to immediately reseed the crng, not just dump it into add_device_randomness alone. But either way, the general idea seems interesting to me. As far as I can tell, QEMU still supports this. Was it not deemed to be sufficiently interesting? Thanks, Jason