linux-kernel - Cannot load linux after recent efi-related changes

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Date:   Sat, 17 Sep 2016 19:24:00 +0300
From:   Mike Krinkin <krinkin.m.u@...il.com>
To:     mingo@...nel.org, tglx@...utronix.de, hpa@...or.com,
        ricardo.neri-calderon@...ux.intel.com, ard.biesheuvel@...aro.org,
        matt@...eblueprint.co.uk, pjones@...hat.com, scott.lawson@...el.com
Cc:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Cannot load linux after recent efi-related changes

Hello,

after commit 3dad6f7f6975 ("x86/efi: Defer efi_esrt_init until after
memblock_x86_fill") kernel hits BUG_ON __efi_enter_virtual_mode because
efi.systab is NULL. With older kernel versions i face the problem with
efi_mem_reserve described in the commit.

AFAICS, get_systab_virt_addr called from efi_map_regions should set
efi.systab, but i dumped memory desciptors in efi_map_regions and
apparently none of them describes region that contains efi_phys.systab,
so efi.systab remains unset.