On Fri, 16 Sep, at 12:00:59PM, Mike Galbraith wrote:
>
> Ok, here's the whole thing just in case. Hope it's not too big.
[...]
> [ 0.000000] esrt: Reserving ESRT space from 0x00000000def87998 to 0x00000000def879d0.
OK, that's 56 bytes and yet I realise that at no point in the
efi_mem_reserve() call path do we round up to the nearest page size
even though the EFI memory map only deals with EFI_PAGE_SIZE regions.
Could you try this patch?
-------->8--------
>From a24b38999965808355c461f8490670266162eabf Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 16 Sep 2016 15:12:47 +0100
Subject: [PATCH] x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE
Mike reported that his machine started rebooting during boot after,
commit 8e80632fb23f ("efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()")
The ESRT table on his machine is 56 bytes and at no point in the
efi_arch_mem_reserve() call path is that size rounded up to
EFI_PAGE_SIZE.
Since the EFI memory map only deals with whole pages, inserting an EFI
memory region with 56 bytes results in a new entry covering zero
pages, and completely screws up the calculations for the old regions
that were trimmed.
Round all sizes upwards to the nearest EFI_PAGE_SIZE boundary.
Additionally, efi_memmap_insert() expects the mem::range::end value to
be one less than the end address for the region.
Reported-by: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Cc: Peter Jones <pjones@xxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/platform/efi/quirks.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index f14b7a9da24b..e881b4b2ffd6 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -201,8 +201,10 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
return;
}
+ size = round_up(size, EFI_PAGE_SIZE);
+
mr.range.start = addr;
- mr.range.end = addr + size;
+ mr.range.end = addr + size - 1;
mr.attribute = md.attribute | EFI_MEMORY_RUNTIME;
num_entries = efi_memmap_split_count(&md, &mr.range);
--
2.9.3
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