On 08/26/19 00:45, Ni, Ray wrote: > 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|0x0000001B > > +[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|BOOLEAN|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. >
Please consider updating the UNI file as well. Reviewed-by: Laszlo Ersek <ler...@redhat.com> -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#46360): https://edk2.groups.io/g/devel/message/46360 Mute This Topic: https://groups.io/mt/33027102/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
