>>> On 05.10.12 at 15:14, Matt Fleming <matt@xxxxxxxxxxxxxxxxx> wrote: > From: Matt Fleming <matt.fleming@xxxxxxxxx> > > This series upgrades real_mode_header->trampoline_pgd to a proper > kernel pagetable instead of just mapping the kernel text and module > space. It also inserts the physical mappings for anything we > ioremap(), so I/O regions are always accessible via their physical > addresses whenever this pagetable is loaded, making it a true identity > mapping. > > These changes make it suitable for loading when calling virtual EFI > runtime functions on x86-64. The main benefit of this change is to fix > the ASUS firmware bug documented here, > > https://lkml.org/lkml/2012/8/7/108 > > but having our own EFI pagetable makes sense anyway. The memory map > code is easily the most complicatd part of the EFI infrastructure, and > it's likely that there will be other funky stuff we have to do with > our memory map as more and more machines ship with various > implementations of EFI firmware. > > Note that we only switch to the identity pagetable for x86-64. I'm > unaware of any bugs like the above on 32-bit EFI platforms, but we can > easily adopt the 64-bit scheme if one is discovered. > > v2: Based on feedback from Jan Beulich delete the 32-bit changes in > [PATCH 1/3], they were likely to create more problems than they would > solve and the identity I/O mappings are unused on 32-bit anyway. > > Matt Fleming (2): > x86, mm: Include the entire kernel memory map in trampoline_pgd > x86, efi: 1:1 pagetable mapping for virtual EFI calls Acked-by: Jan Beulich <jbeulich@xxxxxxxx> (I know too little about the tboot code to meaningfully ack that one too.) > Xiaoyan Zhang (1): > x86/kernel: remove tboot 1:1 page table creation code > > arch/x86/include/asm/efi.h | 28 ++++++++--- > arch/x86/kernel/tboot.c | 78 ++---------------------------- > arch/x86/mm/init_64.c | 9 +++- > arch/x86/mm/ioremap.c | 105 +++++++++++++++++++++++++++++++++++++++++ > arch/x86/platform/efi/efi_64.c | 15 ++++++ > arch/x86/realmode/init.c | 17 ++++++- > 6 files changed, 169 insertions(+), 83 deletions(-) > > -- > 1.7.11.4 -- 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
