lkml.org 
[lkml]   [2022]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 00/23] x86_64: Improvements at compressed kernel stage
On Sun, Nov 20, 2022 at 06:37:40PM +0300, Evgeniy Baskov wrote:
> On 2022-11-20 04:49, joeyli wrote:
> > Hi Evgeniy,
> >
> > Thanks for your effort!
> >
> > On Tue, Oct 25, 2022 at 05:12:38PM +0300, Evgeniy Baskov wrote:
> ...
> >
> > Because Peter Jones point out this patchset to me, so I tried it
> > on OVMF, and I set the EfiLoaderData in DXE memory protection policy:
> >
> > Index: edk2/MdeModulePkg/MdeModulePkg.dec
> > ===================================================================
> > --- edk2.orig/MdeModulePkg/MdeModulePkg.dec
> > +++ edk2/MdeModulePkg/MdeModulePkg.dec
> > @@ -1392,7 +1392,7 @@
> > # e.g. 0x7BD4 can be used for all memory except Code and
> > ACPINVS/Reserved. <BR>
> > #
> > # @Prompt Set DXE memory protection policy.
> > -
> > gEfiMdeModulePkgTokenSpaceGuid.PcdDxeNxMemoryProtectionPolicy|0x0000000|UINT64|0x00001048^M
> > +
> > gEfiMdeModulePkgTokenSpaceGuid.PcdDxeNxMemoryProtectionPolicy|0x0000004|UINT64|0x00001048^M
> >
> > ## PCI Serial Device Info. It is an array of Device, Function, and
> > Power Management
> > # information that describes the path that contains zero or more
> > PCI to PCI bridges
> >
> >
> > I applied this v2 patch set on top of v6.1-rc5 kernel, and boot with a
> > shim which
> > set the PE NX-compatibility DLL Characteristic flag. I got a page
> > fault exception:
> >
> > Loading Linux 6.1.0-rc5-default+ ...
> > Loading initial ramdisk ...
> > !!!! X64 Exception Type - 0E(#PF - Page-Fault) CPU Apic ID - 00000000
> > !!!!
> > ExceptionData - 0000000000000011 I:1 R:0 U:0 W:0 P:1 PK:0 SS:0 SGX:0
> > RIP - 0000000076A3C390, CS - 0000000000000038, RFLAGS -
> > 0000000000210202
> > RAX - 000000007D8CCDF8, RCX - 0000000076A3C390, RDX - 000000007DE86000
> > RBX - 0000000076A3C000, RSP - 000000007FF0D2C8, RBP - 000000007DE86000
> > RSI - 000000007F9EE018, RDI - 000000007DFD1C18
> > R8 - 0000000076A3C000, R9 - 0000000000000190, R10 - 000000007FF1D658
> > R11 - 0000000000000004, R12 - 0000000000000190, R13 - 000000007D8CCE00
> > R14 - 000000007D8C76B4, R15 - 000000007BF0CBD5
> > DS - 0000000000000030, ES - 0000000000000030, FS - 0000000000000030
> > GS - 0000000000000030, SS - 0000000000000030
> > CR0 - 0000000080010033, CR2 - 0000000076A3C390, CR3 - 000000007FC01000
> > CR4 - 0000000000000668, CR8 - 0000000000000000
> > DR0 - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000
> > DR3 - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400
> > GDTR - 000000007F9DE000 0000000000000047, LDTR - 0000000000000000
> > IDTR - 000000007F2E9018 0000000000000FFF, TR - 0000000000000000
> > FXSAVE_STATE - 000000007FF0CF20
> > !!!! Find image based on IP(0x7BF0BAB5)
> > /mnt/working/source_code-git/edk2/Build/OvmfX64/DEBUG_GCC5/X64/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe/DEBUG/VariableRuntimeDxe.dll
> > (ImageBase=0000000000F40E7C, EntryPoint=0000000000F767B8) !!!!
> >
> >
> > My question is: Can I just set EfiLoaderData in DXE memory protection
> > policy
> > in EDK2/OVMF to test this patchset? Or which platform (virtual or
> > physical)
> > can we use for testing?
> >
> > Thanks a lot!
> > Joey Lee
>
> Hi,
>
> Thank you for testing!
>
> The EDK2 OVMF with adjusted PcdDxeNxMemoryProtectionPolicy
> should work with the kernel itself.
>

Thanks for your information. And yes, I have tested v6.1
kernel with this patch set success by direct booting EFI but
by firmware's EFI boot manager

> As far as I can see from my testing with EDK2 OVMF, this
> #PF occurred inside GRUB code before the first instruction
> of the kernel. You can try using GRUB master branch, where
> allocations are changed to use EfiLoaderCode type and with
> PcdDxeNxMemoryProtectionPolicy=0x0000004 it will still be
> executable.
>

Thanks! We will check new grub2!

Joey Lee

\
 
 \ /
  Last update: 2022-11-21 10:43    [W:0.042 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site