linux-kernel - [PATCH] x86/efi Fix regression in efi_arch_mem

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Date:   Wed, 21 Dec 2016 14:11:38 +0100
From:   Petr Oros <poros@...hat.com>
To:     matt@...eblueprint.co.uk
Cc:     ard.biesheuvel@...aro.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/efi Fix regression in efi_arch_mem_reserve

  Booting on EFI with ESRT table has been stop since commit:
    8e80632 efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()

  This is caused by this commit:
    816e761 efi: Allow drivers to reserve boot services forever

  Problem is, that efi_memmap_insert need memory aligned
  on EFI_PAGE_SIZE. If memory not aligned, efi_memmap_insert
  just return and let efi.memmap in inconsistent state.
  This breaking boot.

  Tested in my machine, which stop booting
  after upgrade to 4.9

Signed-off-by: Petr Oros <poros@...hat.com>
---
 arch/x86/platform/efi/quirks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 10aca63..7678857 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -214,7 +214,7 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
 
 	new_size = efi.memmap.desc_size * num_entries;
 
-	new_phys = memblock_alloc(new_size, 0);
+	new_phys = memblock_alloc(new_size, EFI_PAGE_SIZE);
 	if (!new_phys) {
 		pr_err("Could not allocate boot services memmap\n");
 		return;
-- 
2.10.2