Is it possible to let SetStaticPageTable() accept another parameter "PhysicalAddressBits" so it doesn't update the global one? Using this way, SetStaticPageTable() can avoid reference the global variable completely.
> -----Original Message----- > From: Kun Qin <kuqi...@gmail.com> > Sent: Wednesday, April 14, 2021 10:59 AM > To: devel@edk2.groups.io > Cc: Dong, Eric <eric.d...@intel.com>; Ni, Ray <ray...@intel.com>; Laszlo > Ersek <ler...@redhat.com>; Kumar, Rahul1 <rahul1.ku...@intel.com> > Subject: [PATCH v1 1/1] UefiCpuPkg: PiSmmCpuDxeSmm: Not to Change > Bitwidth During Static Paging > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3300 > > Current implementation of SetStaticPageTable routine in PiSmmCpuDxeSmm > driver will check a global variable mPhysicalAddressBits, and eventually > cap any value larger than 39 at 39. > > This global variable is used in ConvertMemoryPageAttributes, which backs > SmmSetMemoryAttributes and SmmClearMemoryAttributes. Thus for a > processor > that supports more than 39 bits width, trying to mark page table regions > higher than 39-bit will always return EFI_UNSUPPROTED. > > This change replaced the changed bitwidth to a stack based variable. > > Cc: Eric Dong <eric.d...@intel.com> > Cc: Ray Ni <ray...@intel.com> > Cc: Laszlo Ersek <ler...@redhat.com> > Cc: Rahul Kumar <rahul1.ku...@intel.com> > > Signed-off-by: Kun Qin <kuqi...@gmail.com> > --- > UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 25 +++++++++++--------- > 1 file changed, 14 insertions(+), 11 deletions(-) > > diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c > b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c > index 6902584b1fbd..0caee8a27abe 100644 > --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c > +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c > @@ -226,6 +226,7 @@ SetStaticPageTable ( > UINTN IndexOfPml4Entries; > UINTN IndexOfPdpEntries; > UINTN IndexOfPageDirectoryEntries; > + UINT64 PhysicalAddressBits; > UINT64 *PageMapLevel5Entry; > UINT64 *PageMapLevel4Entry; > UINT64 *PageMap; > @@ -237,26 +238,28 @@ SetStaticPageTable ( > // IA-32e paging translates 48-bit linear addresses to 52-bit physical > addresses > // when 5-Level Paging is disabled. > // > - ASSERT (mPhysicalAddressBits <= 52); > - if (!m5LevelPagingNeeded && mPhysicalAddressBits > 48) { > - mPhysicalAddressBits = 48; > + PhysicalAddressBits = mPhysicalAddressBits; > + > + ASSERT (PhysicalAddressBits <= 52); > + if (!m5LevelPagingNeeded && PhysicalAddressBits > 48) { > + PhysicalAddressBits = 48; > } > > NumberOfPml5EntriesNeeded = 1; > - if (mPhysicalAddressBits > 48) { > - NumberOfPml5EntriesNeeded = (UINTN) LShiftU64 (1, > mPhysicalAddressBits - 48); > - mPhysicalAddressBits = 48; > + if (PhysicalAddressBits > 48) { > + NumberOfPml5EntriesNeeded = (UINTN) LShiftU64 (1, > PhysicalAddressBits - 48); > + PhysicalAddressBits = 48; > } > > NumberOfPml4EntriesNeeded = 1; > - if (mPhysicalAddressBits > 39) { > - NumberOfPml4EntriesNeeded = (UINTN) LShiftU64 (1, > mPhysicalAddressBits - 39); > - mPhysicalAddressBits = 39; > + if (PhysicalAddressBits > 39) { > + NumberOfPml4EntriesNeeded = (UINTN) LShiftU64 (1, > PhysicalAddressBits - 39); > + PhysicalAddressBits = 39; > } > > NumberOfPdpEntriesNeeded = 1; > - ASSERT (mPhysicalAddressBits > 30); > - NumberOfPdpEntriesNeeded = (UINTN) LShiftU64 (1, > mPhysicalAddressBits - 30); > + ASSERT (PhysicalAddressBits > 30); > + NumberOfPdpEntriesNeeded = (UINTN) LShiftU64 (1, PhysicalAddressBits > - 30); > > // > // By architecture only one PageMapLevel4 exists - so lets allocate storage > for it. > -- > 2.31.0.windows.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#74093): https://edk2.groups.io/g/devel/message/74093 Mute This Topic: https://groups.io/mt/82082904/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-