Add option to enable handling strict page table permissions added in previous patches. Signed-off-by: Baskov Evgeniy <baskov@xxxxxxxxx> --- drivers/firmware/efi/Kconfig | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 2c3dac5ecb36..f57a9c865dce 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -243,6 +243,23 @@ config EFI_DISABLE_PCI_DMA options "efi=disable_early_pci_dma" or "efi=no_disable_early_pci_dma" may be used to override this option. +config EFI_STRICT_PGTABLE + bool "Handle strict page table permissions in libstub" + depends on EFI_STUB && X86 + default y + help + Some firmware disables execution of memory allocated in boot loader + and/or lower megabyte of physical address space, since it is allowed + by specification. That prevents Linux kernel from booting. + + This option makes libstub either create temporary identity mapped + page tables with unset non-executable flag on x86_64 or just disable + paging altogether on i386 to overcome the issue. + + If firmware does not restrict permissions on identity page tables, + temporary page table creation may be disabled with kernel command + line option "efi=notemppt". + endmenu config EFI_EMBEDDED_FIRMWARE -- 2.33.1
