Reviewed-by: Eric Dong <eric.d...@intel.com> > -----Original Message----- > From: Ni, Ray > Sent: Monday, August 26, 2019 6:45 AM > To: devel@edk2.groups.io > Cc: Dong, Eric <eric.d...@intel.com>; Yao, Jiewen <jiewen....@intel.com>; > Laszlo Ersek <ler...@redhat.com> > Subject: [PATCH 4/5] UefiCpuPkg: Explain relationship between several SMM > PCDs > > There are three PCDs that may impact the behavior of each other in SMM > environment: > PcdCpuSmmProfileEnable > PcdHeapGuardPropertyMask in MdeModulePkg > PcdCpuSmmRestrictedMemoryAccess > > The patch updates the comments in DEC file to document it. > > Signed-off-by: Ray Ni <ray...@intel.com> > Cc: Eric Dong <eric.d...@intel.com> > Cc: Jiewen Yao <jiewen....@intel.com> > Cc: Laszlo Ersek <ler...@redhat.com> > --- > UefiCpuPkg/UefiCpuPkg.dec | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index > 83acd33612..9a03bdd716 100644 > --- a/UefiCpuPkg/UefiCpuPkg.dec > +++ b/UefiCpuPkg/UefiCpuPkg.dec > @@ -81,7 +81,8 @@ [Ppis] > [PcdsFeatureFlag] > ## Indicates if SMM Profile will be enabled. > # If enabled, instruction executions in and data accesses to memory > outside > of SMRAM will be logged. > - # It could not be enabled at the same time with SMM static page table > feature (PcdCpuSmmStaticPageTable). > + # In X64 build, it could not be enabled when > PcdCpuSmmRestrictedMemoryAccess is TRUE. > + # In IA32 build, the page table memory is not marked as read-only when it > is > enabled. > # This PCD is only for validation purpose. It should be set to false in > production.<BR><BR> > # TRUE - SMM Profile will be enabled.<BR> > # FALSE - SMM Profile will be disabled.<BR> > @@ -285,6 +286,11 @@ [PcdsFixedAtBuild.X64, PcdsPatchableInModule.X64, > PcdsDynamic.X64, PcdsDynamicEx > # The PCD value is considered as constantly TRUE in IA32 platforms. > # When the PCD value is TRUE, page table is initialized to cover all > memory > spaces > # and the memory occupied by page table is protected by page table itself > as > read-only. > + # In X64 build, it cannot be enabled at the same time with SMM profile > feature (PcdCpuSmmProfileEnable). > + # In X64 build, it could not be enabled also at the same time with > + heap guard feature for SMM # (PcdHeapGuardPropertyMask in > MdeModulePkg). > + # In IA32 build, page table memory is not marked as read-only when > + either SMM profile feature (PcdCpuSmmProfileEnable) # or heap guard > feature for SMM (PcdHeapGuardPropertyMask in MdeModulePkg) is enabled. > # TRUE - Access to non-SMRAM memory is restricted to reserved, runtime > and ACPI NVS type after SmmReadyToLock.<BR> > # FALSE - Access to any type of non-SMRAM memory after > SmmReadyToLock is allowed.<BR> > # @Prompt Access to non-SMRAM memory is restricted to reserved, runtime > and ACPI NVS type after SmmReadyToLock. > -- > 2.21.0.windows.1
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