[edk2-devel] [PATCH 3/3] UefiCpuPkg/PiSmmCpu: Enable 5 level paging when CPU supports
Ni, Ray
ray.ni at intel.com
Tue Jul 2 14:44:33 UTC 2019
Laszlo,
I agree with your changes.
Will include your changes in V2.
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Laszlo Ersek
> Sent: Monday, July 1, 2019 8:45 PM
> To: devel at edk2.groups.io; Ni, Ray <ray.ni at intel.com>
> Cc: Dong, Eric <eric.dong at intel.com>
> Subject: Re: [edk2-devel] [PATCH 3/3] UefiCpuPkg/PiSmmCpu: Enable 5 level
> paging when CPU supports
>
> On 06/28/19 08:47, Ni, Ray wrote:
> > REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1946
> >
> > The patch changes SMM environment to use 5 level paging when CPU
> > supports it.
> >
> > Signed-off-by: Ray Ni <ray.ni at intel.com>
> > Cc: Eric Dong <eric.dong at intel.com>
> > ---
> > .../PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c | 20 +-
> > UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c | 272 ++++++----
> > UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 483 ++++++++++++------
> > UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm | 12 +
> > .../PiSmmCpuDxeSmm/X64/SmmProfileArch.c | 72 ++-
> > 5 files changed, 559 insertions(+), 300 deletions(-)
>
> This patch does not build with GCC, because:
>
> > diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > index 3d5d663d99..c088010327 100644
> > --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > @@ -16,6 +16,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
> > LIST_ENTRY mPagePool = INITIALIZE_LIST_HEAD_VARIABLE
> (mPagePool);
> > BOOLEAN m1GPageTableSupport = FALSE;
> > BOOLEAN mCpuSmmStaticPageTable;
> > +BOOLEAN m5LevelPagingSupport;
>
> as-is, two translation units *define* (allocate) "m5LevelPagingSupport":
> "PageTbl.c" above, and "SmiEntry.nasm". And that breaks the build with
> GCC (it should break the build with VS as well, because it is a bug in
> the code).
>
> However, I'm not suggesting that we add "extern" to "PageTbl.c".
>
> Because, I don't think we should reintroduce DBs into the PiSmmCpuDxeSmm
> assembly code. That would be a regression for:
>
> https://bugzilla.tianocore.org/show_bug.cgi?id=866
>
> We should *especially* not reintroduce the dual use of a byte
> - both for binary instruction encoding,
> - and as a data value (for steering C-language code).
>
> PiSmmCpuDxeSmm had that kind of code before, but I eliminated it. For
> example, in commit 3c5ce64f23c4 ("UefiCpuPkg/PiSmmCpuDxeSmm: patch
> "XdSupported" with PatchInstructionX86()", 2018-04-04).
>
> Therefore, please incorporate the following update, into patch #3:
>
> > diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
> b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
> > index b5e0405b3b00..ae79bf024bf0 100644
> > --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
> > +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
> > @@ -69,7 +69,7 @@ extern ASM_PFX(mXdSupported)
> > global ASM_PFX(gPatchXdSupported)
> > global ASM_PFX(gPatchSmiStack)
> > global ASM_PFX(gPatchSmiCr3)
> > -global ASM_PFX(m5LevelPagingSupport)
> > +global ASM_PFX(gPatch5LevelPagingSupport)
> > global ASM_PFX(gcSmiHandlerTemplate)
> > global ASM_PFX(gcSmiHandlerSize)
> >
> > @@ -126,8 +126,8 @@ ASM_PFX(gPatchSmiCr3):
> > mov cr3, rax
> > mov eax, 0x668 ; as cr4.PGE is not set here, refresh cr3
> >
> > - DB 0xb1 ; mov cl, m5LevelPagingSupport
> > -ASM_PFX(m5LevelPagingSupport): DB 0
> > + mov cl, strict byte 0 ; source operand will be patched
> > +ASM_PFX(gPatch5LevelPagingSupport):
> > cmp cl, 0
> > je SkipEnable5LevelPaging
> > ;
> > diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > index c08801032766..c31160735a37 100644
> > --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
> > @@ -17,6 +17,7 @@ LIST_ENTRY mPagePool =
> INITIALIZE_LIST_HEAD_VARIABLE (m
> > BOOLEAN m1GPageTableSupport = FALSE;
> > BOOLEAN mCpuSmmStaticPageTable;
> > BOOLEAN m5LevelPagingSupport;
> > +X86_ASSEMBLY_PATCH_LABEL gPatch5LevelPagingSupport;
> >
> > /**
> > Disable CET.
> > @@ -337,6 +338,7 @@ SmmInitPageTable (
> > m1GPageTableSupport = Is1GPageSupport ();
> > m5LevelPagingSupport = Is5LevelPagingSupport ();
> > mPhysicalAddressBits = CalculateMaximumSupportAddress ();
> > + PatchInstructionX86 (gPatch5LevelPagingSupport, m5LevelPagingSupport, 1);
> > DEBUG ((DEBUG_INFO, "5LevelPaging Support - %d\n",
> m5LevelPagingSupport));
> > DEBUG ((DEBUG_INFO, "1GPageTable Support - %d\n",
> m1GPageTableSupport));
> > DEBUG ((DEBUG_INFO, "PcdCpuSmmStaticPageTable - %d\n",
> mCpuSmmStaticPageTable));
>
> With this update, the build succeeds, and a quick regression-test has
> passed for me (using OVMF/IA32X64).
>
> I'll try to do deeper testing if you agree with this update.
>
> Thanks,
> Laszlo
>
>
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