Messages in this thread | | | Date | Mon, 5 Aug 2013 15:02:59 +0200 | From | Borislav Petkov <> | Subject | Re: [edk2] Corrupted EFI region |
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On Mon, Aug 05, 2013 at 01:27:16PM +0200, Laszlo Ersek wrote: > > --- before 2013-07-31 22:20:52.316039492 +0200 > > +++ after 2013-07-31 22:21:30.960731706 +0200 > > @@ -9,7 +9,7 @@ efi: mem07: type=2, attr=0xf, range=[0x0 > > efi: mem08: type=7, attr=0xf, range=[0x0000000040000000-0x000000007c000000) (960MB) > > efi: mem09: type=4, attr=0xf, range=[0x000000007c000000-0x000000007c020000) (0MB) > > efi: mem10: type=7, attr=0xf, range=[0x000000007c020000-0x000000007e0ad000) (32MB) > > -efi: mem11: type=4, attr=0xf, range=[0x000000007e0ad000-0x000000007e0cc000) (0MB) > > +efi: mem11: type=4, attr=0xf, range=[0x000000007e0ad000-0x000000007e0ad000) (0MB) > > (type 4 is EfiBootServicesData)
Yes.
> > efi: mem12: type=7, attr=0xf, range=[0x000000007e0cc000-0x000000007e0cd000) (0MB) > > efi: mem13: type=4, attr=0xf, range=[0x000000007e0cd000-0x000000007e55d000) (4MB) > > efi: mem14: type=3, attr=0xf, range=[0x000000007e55d000-0x000000007e59c000) (0MB) > > > > That second boundary of region mem11 suddenly changes *before* we merge > > the regions. edk2 bug? > > I take it you mean this change (ie. appearance of the zero-sized range) > occurs when you enable KVM acceleration in qemu?
Right. And I'm booting with qemu -enable-kvm so KVM acceleration is enabled?? Or do you mean something else.
> If so, please locate "gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel" > in OvmfPkg/OvmfPkgX64.dsc, and set the following bit in its value: > > # DEBUG_GCD 0x00100000 Global Coherency Database changes > > Then please rebuild OVMF, and capture the debug port output of qemu > ("-debugcon file:debug.log -global isa-debugcon.iobase=0x402") both with > and without KVM. > > DEBUG_GCD should produce messages related to CoreAllocateSpace(), and > might help us find the spot the difference is introduced.
Ok, I'll try to get this thing done before my vacation. If not, we'll deal with it afterwards but I won't forget, I promise! :-)
> BTW does this have anything to do with the NX bit report of yours, or > have you noticed this independently?
Independently, while testing my runtime services mapping patchset. I was getting an empty region and was wondering whether to discard it from the mapping or not and then I looked at why I get it in the first place.
Basically, I get this empty region which appears at some point. It is there when we enter efi_enter_virtual_mode in the kernel to setup the runtime mappings:
[ 0.005012] efi: efi_enter_virtual_mode: enter [ 0.006004] efi: mem00: type=7, attr=0xf, range=[0x0000000000000000-0x000000000009f000) (0MB) [ 0.007004] efi: mem01: type=2, attr=0xf, range=[0x000000000009f000-0x00000000000a0000) (0MB) [ 0.008003] efi: mem02: type=7, attr=0xf, range=[0x0000000000100000-0x0000000000800000) (7MB) [ 0.009004] efi: mem03: type=4, attr=0xf, range=[0x0000000000800000-0x0000000001000000) (8MB) [ 0.010004] efi: mem04: type=7, attr=0xf, range=[0x0000000001000000-0x0000000002000000) (16MB) [ 0.011004] efi: mem05: type=2, attr=0xf, range=[0x0000000002000000-0x00000000036e3000) (22MB) [ 0.012004] efi: mem06: type=7, attr=0xf, range=[0x00000000036e3000-0x000000003fffb000) (969MB) [ 0.013003] efi: mem07: type=2, attr=0xf, range=[0x000000003fffb000-0x0000000040000000) (0MB) [ 0.014004] efi: mem08: type=7, attr=0xf, range=[0x0000000040000000-0x000000007c000000) (960MB) [ 0.015004] efi: mem09: type=4, attr=0xf, range=[0x000000007c000000-0x000000007c020000) (0MB) [ 0.016004] efi: mem10: type=7, attr=0xf, range=[0x000000007c020000-0x000000007e0ad000) (32MB) [ 0.017004] efi: mem11: type=4, attr=0xf, range=[0x000000007e0ad000-0x000000007e0ad000) (0MB) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 0.018003] efi: mem12: type=7, attr=0xf, range=[0x000000007e0cc000-0x000000007e0cd000) (0MB)
When we dump the EFI regions initially, it is ok.
[ 0.000000] efi: mem10: type=7, attr=0xf, range=[0x000000007c020000-0x000000007e0ad000) (32MB) [ 0.000000] efi: mem11: type=4, attr=0xf, range=[0x000000007e0ad000-0x000000007e0cc000) (0MB) [ 0.000000] efi: mem12: type=7, attr=0xf, range=[0x000000007e0cc000-0x000000007e0cd000) (0MB)
So what basically happens is the end boundary of the region becomes the start, practically turning it into a 0-size one.
Thanks for looking into it.
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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