* [PATCH v3] UefiCpuPkg\CpuSmm: Save & restore CR2 on-demand paging in SMM
@ 2019-03-18 8:47 nkvangup
0 siblings, 0 replies; only message in thread
From: nkvangup @ 2019-03-18 8:47 UTC (permalink / raw)
To: edk2-devel
Cc: Vanguput Narendra K, Eric Dong, Ray Ni, Laszlo Ersek, Yao Jiewen
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1593
For every SMI occurrence, save and restore CR2 register only when SMM
on-demand paging support is enabled in 64 bit operation mode.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Vanguput Narendra K <narendra.k.vanguput@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Yao Jiewen <jiewen.yao@intel.com>
---
...CpuSmm-Save-restore-CR2-on-demand-paging-.patch | 62 ++++++++++++++++++++++
UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 22 +++++---
UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 2 +-
3 files changed, 77 insertions(+), 9 deletions(-)
create mode 100644 0001-UefiCpuPkg-CpuSmm-Save-restore-CR2-on-demand-paging-.patch
diff --git a/0001-UefiCpuPkg-CpuSmm-Save-restore-CR2-on-demand-paging-.patch b/0001-UefiCpuPkg-CpuSmm-Save-restore-CR2-on-demand-paging-.patch
new file mode 100644
index 0000000000..92f5ea0f4f
--- /dev/null
+++ b/0001-UefiCpuPkg-CpuSmm-Save-restore-CR2-on-demand-paging-.patch
@@ -0,0 +1,62 @@
+From 793ab6bf9facbdcd34f4a1e8ccdfdbd1657f594e Mon Sep 17 00:00:00 2001
+From: nkvangup <narendra.k.vanguput@intel.com>
+Date: Tue, 5 Mar 2019 22:43:42 +0530
+Subject: [PATCH v2] UefiCpuPkg\CpuSmm: Save & restore CR2 on-demand paging in
+ SMM
+
+BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1593
+
+For every SMI occurrence, save and restore CR2 register only when SMM
+on-demand paging support is enabled in 64 bit operation mode.
+
+Contributed-under: TianoCore Contribution Agreement 1.1
+Signed-off-by: Vanguput Narendra K <narendra.k.vanguput@intel.com>
+Cc: Eric Dong <eric.dong@intel.com>
+Cc: Ray Ni <ray.ni@intel.com>
+Cc: Laszlo Ersek <lersek@redhat.com>
+Cc: Yao Jiewen <jiewen.yao@intel.com>
+---
+ UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 20 ++++++++++++--------
+ 1 file changed, 12 insertions(+), 8 deletions(-)
+
+diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+index 3b0b3b52ac..5be4a2b020 100644
+--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
++++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+@@ -1111,10 +1111,12 @@ SmiRendezvous (
+
+ ASSERT(CpuIndex < mMaxNumberOfCpus);
+
+- //
+- // Save Cr2 because Page Fault exception in SMM may override its value
+- //
+- Cr2 = AsmReadCr2 ();
++ if ((sizeof (UINTN) == sizeof (UINT64)) && (!PcdGetBool (PcdCpuSmmStaticPageTable))) {
++ //
++ // Save Cr2 because Page Fault exception in SMM may override its value
++ //
++ Cr2 = AsmReadCr2 ();
++ }
+
+ //
+ // Perform CPU specific entry hooks
+@@ -1253,10 +1255,12 @@ SmiRendezvous (
+
+ Exit:
+ SmmCpuFeaturesRendezvousExit (CpuIndex);
+- //
+- // Restore Cr2
+- //
+- AsmWriteCr2 (Cr2);
++ if ((sizeof (UINTN) == sizeof (UINT64)) && (!PcdGetBool (PcdCpuSmmStaticPageTable))) {
++ //
++ // Restore Cr2
++ //
++ AsmWriteCr2 (Cr2);
++ }
+ }
+
+ /**
+--
+2.16.2.windows.1
+
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index 3b0b3b52ac..5e3a39a234 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -28,6 +28,7 @@ UINTN mSemaphoreSize;
SPIN_LOCK *mPFLock = NULL;
SMM_CPU_SYNC_MODE mCpuSmmSyncMode;
BOOLEAN mMachineCheckSupported = FALSE;
+BOOLEAN mCpuSmmStaticPageTable = TRUE;
/**
Performs an atomic compare exchange operation to get semaphore.
@@ -1111,10 +1112,13 @@ SmiRendezvous (
ASSERT(CpuIndex < mMaxNumberOfCpus);
- //
- // Save Cr2 because Page Fault exception in SMM may override its value
- //
- Cr2 = AsmReadCr2 ();
+ if (!mCpuSmmStaticPageTable) {
+ //
+ // Save and restore Cr2 when using on-demand paging for above 4G memory because Page Fault
+ // exception in SMM may override its value
+ //
+ Cr2 = AsmReadCr2 ();
+ }
//
// Perform CPU specific entry hooks
@@ -1253,10 +1257,12 @@ SmiRendezvous (
Exit:
SmmCpuFeaturesRendezvousExit (CpuIndex);
- //
- // Restore Cr2
- //
- AsmWriteCr2 (Cr2);
+ if (!mCpuSmmStaticPageTable) {
+ //
+ // Restore Cr2
+ //
+ AsmWriteCr2 (Cr2);
+ }
}
/**
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
index 2c77cb47a4..e444b8a031 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
@@ -21,7 +21,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
LIST_ENTRY mPagePool = INITIALIZE_LIST_HEAD_VARIABLE (mPagePool);
BOOLEAN m1GPageTableSupport = FALSE;
-BOOLEAN mCpuSmmStaticPageTable;
+extern BOOLEAN mCpuSmmStaticPageTable;
/**
Disable CET.
--
2.16.2.windows.1
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2019-03-18 8:47 [PATCH v3] UefiCpuPkg\CpuSmm: Save & restore CR2 on-demand paging in SMM nkvangup
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