On 04/06/17 at 09:43pm, Rafael J. Wysocki wrote: > On Wed, Apr 5, 2017 at 10:16 PM, David Howells <dhowells@xxxxxxxxxx> wrote: > > From: Josh Boyer <jwboyer@xxxxxxxxxx> > > > > This option allows userspace to pass the RSDP address to the kernel, which > > makes it possible for a user to circumvent any restrictions imposed on > > loading modules. Ignore the option when the kernel is locked down. > > I'm not really sure here. > > What exactly is the mechanism? Actually this acpi_rsdp param is created for EFI kexec reboot in old days when we had not supported persistent efi vm space across kexec reboot. At that time kexec reboot runs as noefi mode, it can not find the acpi root table thus kernel will hang early. Now kexec can support EFI boot so this param is not necessary for most user unless they still use efi=old_map. > > Thanks, > Rafael > -- > To unsubscribe from this list: send the line "unsubscribe linux-efi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
