On 29 June 2015 at 17:12, Ard Biesheuvel <ard.biesheu...@linaro.org> wrote:
> On 29 June 2015 at 17:09, Matt Fleming <m...@codeblueprint.co.uk> wrote:
>> On Mon, 29 Jun, at 03:06:32PM, Laszlo Ersek wrote:
>>>
>>> In any case, for OVMF, I think we'll need a small patch that disables
>>> this feature (if for nothing else, then to quell the noisy warnings
>>> about "the section alignment being != 4 KB"). I'm adding that to my
>>> queue (but anyone please feel free to do it while I'm offline).
>>
>> Is there any chance that we could wire up support in OVMF? What work is
>> required to support it?
>>
>
> I think it would be fairly easy, actually, once Laszlo manages to
> untangle the S3Save mess so that OVMF signals EndOfDxe correctly.
> Then, it is mainly a matter of using the new build script that emits 4
> KB aligned segments for .text and .data
>
This seems to do the job nicely:
----------8<------------
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index e5fc90d2e610..7f06b51f65cf 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -48,6 +48,9 @@ [BuildOptions]
INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
!endif
+[BuildOptions.X64.EDKII.DXE_RUNTIME_DRIVER]
+ GCC:*_*_*_DLINK_FLAGS =
--script=$(EDK_TOOLS_PATH)/Scripts/gcc-4K-align-ld-script
+
################################################################################
#
# SKU Identification section - list of all SKU IDs supported by this Platform.
----------8<------------
$ readelf -S
Build/OvmfX64/DEBUG_GCC48/X64/OvmfPkg/EmuVariableFvbRuntimeDxe/Fvb/DEBUG/EmuVariableFvbRuntimeDxe.dll
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
...
[ 1] .text PROGBITS 0000000000001000 00001000
0000000000004780 0000000000000000 AX 0 0 4096
...
[ 3] .data PROGBITS 0000000000006000 00006000
0000000000002740 0000000000000000 WA 0 0 4096
...
With Laszlo's 9 piece series applied to ensure that end of DXE gets
signalled, UEFI seems to do the right thing here. Here's a snippet of
my boot log (x86_64)
[ 0.000000] efi: mem22: type=6, attr=0x800000000000400f,
range=[0x0000000006daa000-0x0000000006db1000) (0MB)
[ 0.000000] efi: mem23: type=5, attr=0x800000000002000f,
range=[0x0000000006db1000-0x0000000006db6000) (0MB)
[ 0.000000] efi: mem24: type=6, attr=0x800000000000400f,
range=[0x0000000006db6000-0x0000000006dc0000) (0MB)
[ 0.000000] efi: mem25: type=6, attr=0x800000000000400f,
range=[0x0000000006dc0000-0x0000000006dc1000) (0MB)
[ 0.000000] efi: mem26: type=5, attr=0x800000000002000f,
range=[0x0000000006dc1000-0x0000000006dc5000) (0MB)
[ 0.000000] efi: mem27: type=6, attr=0x800000000000400f,
range=[0x0000000006dc5000-0x0000000006dce000) (0MB)
[ 0.000000] efi: mem28: type=6, attr=0x800000000000400f,
range=[0x0000000006dce000-0x0000000006dcf000) (0MB)
[ 0.000000] efi: mem29: type=5, attr=0x800000000002000f,
range=[0x0000000006dcf000-0x0000000006dd5000) (0MB)
[ 0.000000] efi: mem30: type=6, attr=0x800000000000400f,
range=[0x0000000006dd5000-0x0000000006e02000) (0MB)
[ 0.000000] efi: mem31: type=6, attr=0x800000000000400f,
range=[0x0000000006e02000-0x0000000006e03000) (0MB)
[ 0.000000] efi: mem32: type=5, attr=0x800000000002000f,
range=[0x0000000006e03000-0x0000000006e12000) (0MB)
[ 0.000000] efi: mem33: type=6, attr=0x800000000000400f,
range=[0x0000000006e12000-0x0000000006e1a000) (0MB)
so code and data regions are correctly marked as RO and XP, respectively.
However, further down I get
[ 0.034428] BUG: unable to handle kernel paging request at fffffffefe60d64d
[ 0.036000] IP: [<fffffffefe60d64d>] 0xfffffffefe60d64d
[ 0.036000] PGD 4c11067 PUD 601b063 PMD 6028063 PTE 0
[ 0.036000] Oops: 0010 [#1] SMP
[ 0.036000] Modules linked in:
[ 0.036000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
3.13.0-55-generic #94-Ubuntu
[ 0.036000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 0.0.0 02/06/2015
[ 0.036000] task: ffffffff81c15480 ti: ffffffff81c00000 task.ti:
ffffffff81c00000
[ 0.036000] RIP: 0010:[<fffffffefe60d64d>] [<fffffffefe60d64d>]
0xfffffffefe60d64d
[ 0.036000] RSP: 0000:ffffffff81c01d48 EFLAGS: 00000202
[ 0.036000] RAX: fffffffefe60d64d RBX: ffffffffffffffff RCX: ffffffff81c396e0
[ 0.036000] RDX: ffffffff81c01f00 RSI: ffffffff81c396e0 RDI: fffffffefe40a957
[ 0.036000] RBP: ffffffff81c01e00 R08: 0000000000000007 R09: 0000000000000000
[ 0.036000] R10: ffffea0000180e00 R11: ffffffff81d51ce0 R12: ffffffff81c01f00
[ 0.036000] R13: 0000000000000000 R14: 0000000000000007 R15: 000000000009c000
[ 0.036000] FS: 0000000000000000(0000) GS:ffff880006600000(0000)
knlGS:0000000000000000
[ 0.036000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.036000] CR2: fffffffefe60d64d CR3: 000000000009c000 CR4: 00000000000006b0
[ 0.036000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.036000] DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000
[ 0.036000] Stack:
[ 0.036000] fffffffefe40aa08 ffffffff81c01da0 0000000007eb3893
0000000006db7000
[ 0.036000] 0000000006db7000 0000000006dba000 0000000007eed090
0000000000000078
[ 0.036000] 752ea16d07eede98 ffffffff81c01de0 0000000007eb3800
0000000007eed018
[ 0.036000] Call Trace:
[ 0.036000] [<ffffffff810624f1>] efi_call5+0x71/0xf0
[ 0.036000] [<ffffffff81061879>] ? virt_efi_set_variable+0x49/0x60
[ 0.036000] [<ffffffff81d51d4c>] efi_enter_virtual_mode+0x2fe/0x332
[ 0.036000] [<ffffffff81d34edc>] start_kernel+0x3a4/0x443
[ 0.036000] [<ffffffff81d34941>] ? repair_env_string+0x5c/0x5c
[ 0.036000] [<ffffffff81d34120>] ? early_idt_handlers+0x120/0x120
[ 0.036000] [<ffffffff81d345ee>] x86_64_start_reservations+0x2a/0x2c
[ 0.036000] [<ffffffff81d34733>] x86_64_start_kernel+0x143/0x152
[ 0.036000] Code: Bad RIP value.
[ 0.036000] RIP [<fffffffefe60d64d>] 0xfffffffefe60d64d
[ 0.036000] RSP <ffffffff81c01d48>
[ 0.036000] CR2: fffffffefe60d64d
[ 0.036000] ---[ end trace acf85ef8d4475d7c ]---
--
Ard.
------------------------------------------------------------------------------
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