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From: Jiewen Yao <jiewen.yao@intel.com>
To: edk2-devel@lists.01.org
Cc: Jeff Fan <jeff.fan@intel.com>, Feng Tian <feng.tian@intel.com>,
	Star Zeng <star.zeng@intel.com>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH V3 4/6] UefiCpuPkg/dec: Add PcdCpuSmmStaticPageTable.
Date: Fri, 11 Nov 2016 17:00:57 +0800	[thread overview]
Message-ID: <1478854859-11096-5-git-send-email-jiewen.yao@intel.com> (raw)
In-Reply-To: <1478854859-11096-1-git-send-email-jiewen.yao@intel.com>

If enabled, SMM will not use on-demand paging.
SMM will build static page table for all memory.

The page table size depend on 2 things:
1) The 1G paging capability.
2) The whole system memory/MMIO addressing capability.

A) If the system only supports 2M paging,
When the whole memory/MMIO is 32bit, we only need 1+1+4=6 pages for 4G.
When the whole memory/MMIO is 39bit, we need 1+1+256 pages (~ 1M)
When the whole memory/MMIO is 48bit, we need 1+256+256*256 pages (~ 257M)

B) If the system supports 1G paging.
When the whole memory/MMIO is 32bit, we only need 1+1+4=6 pages for 4G.
(We still generate 2M page for maintenance consideration.)
When the whole memory/MMIO is 39bit, we still need 6 pages.
(We setup 1G paging for >1G.)
When the whole memory/MMIO is 48bit, we need 1+256 pages (~ 1M).

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
---
 UefiCpuPkg/UefiCpuPkg.dec | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 8674533..a110820 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -199,6 +199,14 @@
   # @Prompt The specified AP target C-state for Mwait.
   gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate|0|UINT8|0x00000007
 
+  ## Indicates if SMM uses static page table.
+  #  If enabled, SMM will not use on-demand paging. SMM will build static page table for all memory.<BR><BR>
+  #  This flag only impacts X64 build, because SMM alway builds static page table for IA32.
+  #   TRUE  - SMM uses static page table for all memory.<BR>
+  #   FALSE - SMM uses static page table for below 4G memory and use on-demand paging for above 4G memory.<BR>
+  # @Prompt Use static page table for all memory in SMM.
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStaticPageTable|TRUE|BOOLEAN|0x3213210D
+
 [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.
-- 
2.7.4.windows.1



  parent reply	other threads:[~2016-11-11  9:01 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-11  9:00 [PATCH V3 0/6] Enable SMM page level protection Jiewen Yao
2016-11-11  9:00 ` [PATCH V3 1/6] MdeModulePkg/Include: Add PiSmmMemoryAttributesTable.h Jiewen Yao
2016-11-11  9:00 ` [PATCH V3 2/6] MdeModulePkg/dec: Add gEdkiiPiSmmMemoryAttributesTableGuid Jiewen Yao
2016-11-11  9:00 ` [PATCH V3 3/6] MdeModulePkg/PiSmmCore: Add MemoryAttributes support Jiewen Yao
2016-11-11  9:00 ` Jiewen Yao [this message]
2016-11-11  9:00 ` [PATCH V3 5/6] UefiCpuPkg/PiSmmCpuDxeSmm: Add paging protection Jiewen Yao
2016-11-11  9:00 ` [PATCH V3 6/6] QuarkPlatformPkg/dsc: enable Smm " Jiewen Yao
2016-11-11  9:12 ` [PATCH V3 0/6] Enable SMM page level protection Yao, Jiewen
2016-11-11 12:26   ` Laszlo Ersek
2016-11-11 12:38     ` Fan, Jeff
2016-11-11 12:52       ` Laszlo Ersek
2016-11-11 12:53       ` Yao, Jiewen
2016-11-11 12:59         ` Laszlo Ersek
2016-11-15  2:47           ` Laszlo Ersek
2016-11-16 15:53             ` Laszlo Ersek
2016-11-16 16:14               ` Yao, Jiewen
2016-11-17  0:45 ` Fan, Jeff
2016-11-17  1:30   ` Kinney, Michael D
2016-11-17  1:36     ` Yao, Jiewen
2016-11-17  9:55       ` Laszlo Ersek
2016-11-17 12:03         ` Yao, Jiewen

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