On 12/05/13 at 09:52pm, Borislav Petkov wrote: > On Thu, Dec 05, 2013 at 08:56:02AM -0700, Toshi Kani wrote: > > The smbios in efi_setup_data is necessary for kexec to pass the physical > > address of the SMBIOS table from the 1st kernel to the 2nd kernel. > > > > The kernel boot sequence proceeds in the following order. Step 2 > > requires efi.smbios to be the physical address. However, Dave found > > that EFI system table has a virtual address of SMBIOS in step 1. Hence, > > he sets it back to the physical address with the smbios in > > efi_setup_data. (When it is still the physical address, it simply sets > > the same value.) > > > > 1. efi_init() - Set efi.smbios from EFI system table > > 2. dmi_scan_machine() - Temporary map efi.smbios to access SMBIOS table > > 3. efi_enter_virtual_mode() - Map EFI ranges > > Thanks Toshi, it is all clear now. > > @Dave: you might want to put Toshi's explanation in the commit message > of your patch so that we know *why* the change is needed. Ok, will do. Thanks Dave
