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 1/5] UefiCpuPkg: Add PcdCpuSmmRestrictedMemoryAccess > > The patch adds a new X64 only PCD PcdCpuSmmRestrictedMemoryAccess. > The PCD indicates access to non-SMRAM memory is restricted to reserved, > runtime and ACPI NVS type after SmmReadyToLock. > MMIO access is always allowed regardless of the value of this PCD. > Loose of such restriction is only required by RAS components in X64 platforms. > 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. > > 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 | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index > 86ad61f64b..83acd33612 100644 > --- a/UefiCpuPkg/UefiCpuPkg.dec > +++ b/UefiCpuPkg/UefiCpuPkg.dec > @@ -278,6 +278,18 @@ [PcdsFixedAtBuild, PcdsPatchableInModule, > PcdsDynamic, PcdsDynamicEx] > # @Prompt Current boot is a power-on reset. > > gUefiCpuPkgTokenSpaceGuid.PcdIsPowerOnReset|FALSE|BOOLEAN|0x000000 > 1B > > +[PcdsFixedAtBuild.X64, PcdsPatchableInModule.X64, PcdsDynamic.X64, > +PcdsDynamicEx.X64] > + ## Indicate access to non-SMRAM memory is restricted to reserved, > runtime and ACPI NVS type after SmmReadyToLock. > + # MMIO access is always allowed regardless of the value of this PCD. > + # Loose of such restriction is only required by RAS components in X64 > platforms. > + # 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. > + # 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. > + > +gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmRestrictedMemoryAccess|TRUE|B > OOLEAN| > +0x3213210F > + > [PcdsDynamic, PcdsDynamicEx] > ## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA. > # @Prompt The pointer to a CPU S3 data buffer. > -- > 2.21.0.windows.1
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