From: Zhou Jianfeng <jianfeng.zhou@intel.com>
To: devel@edk2.groups.io
Cc: Zhou Jianfeng <jianfeng.zhou@intel.com>,
Ray Ni <ray.ni@intel.com>, Laszlo Ersek <lersek@redhat.com>,
Rahul Kumar <rahul1.kumar@intel.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Pedro Falcato <pedro.falcato@gmail.com>,
Zhang Di <di.zhang@intel.com>, Tan Dun <dun.tan@intel.com>
Subject: [edk2-devel] [PATCH] UefiCpuPkg/CpuPageTableLib: qualify page table accesses as volatile
Date: Thu, 22 Feb 2024 16:41:28 +0800 [thread overview]
Message-ID: <20240222084128.30000-1-jianfeng.zhou@intel.com> (raw)
Add volatile qualifier to page table related variable to prevent
compiler from optimizing away the variables which may lead to
unexpected result.
Signed-off-by: Zhou Jianfeng <jianfeng.zhou@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Zhang Di <di.zhang@intel.com>
Cc: Tan Dun <dun.tan@intel.com>
---
.../Library/CpuPageTableLib/CpuPageTableMap.c | 38 +++++++++----------
1 file changed, 19 insertions(+), 19 deletions(-)
diff --git a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
index 2ea40666cc..996e4001fa 100644
--- a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
+++ b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
@@ -20,13 +20,13 @@
**/
VOID
PageTableLibSetPte4K (
- IN OUT IA32_PTE_4K *Pte4K,
- IN UINT64 Offset,
- IN IA32_MAP_ATTRIBUTE *Attribute,
- IN IA32_MAP_ATTRIBUTE *Mask
+ IN OUT volatile IA32_PTE_4K *Pte4K,
+ IN UINT64 Offset,
+ IN IA32_MAP_ATTRIBUTE *Attribute,
+ IN IA32_MAP_ATTRIBUTE *Mask
)
{
- IA32_PTE_4K LocalPte4K;
+ volatile IA32_PTE_4K LocalPte4K;
LocalPte4K.Uint64 = Pte4K->Uint64;
if (Mask->Bits.PageTableBaseAddressLow || Mask->Bits.PageTableBaseAddressHigh) {
@@ -94,13 +94,13 @@ PageTableLibSetPte4K (
**/
VOID
PageTableLibSetPleB (
- IN OUT IA32_PAGE_LEAF_ENTRY_BIG_PAGESIZE *PleB,
- IN UINT64 Offset,
- IN IA32_MAP_ATTRIBUTE *Attribute,
- IN IA32_MAP_ATTRIBUTE *Mask
+ IN OUT volatile IA32_PAGE_LEAF_ENTRY_BIG_PAGESIZE *PleB,
+ IN UINT64 Offset,
+ IN IA32_MAP_ATTRIBUTE *Attribute,
+ IN IA32_MAP_ATTRIBUTE *Mask
)
{
- IA32_PAGE_LEAF_ENTRY_BIG_PAGESIZE LocalPleB;
+ volatile IA32_PAGE_LEAF_ENTRY_BIG_PAGESIZE LocalPleB;
LocalPleB.Uint64 = PleB->Uint64;
if (Mask->Bits.PageTableBaseAddressLow || Mask->Bits.PageTableBaseAddressHigh) {
@@ -171,11 +171,11 @@ PageTableLibSetPleB (
**/
VOID
PageTableLibSetPle (
- IN UINTN Level,
- IN OUT IA32_PAGING_ENTRY *Ple,
- IN UINT64 Offset,
- IN IA32_MAP_ATTRIBUTE *Attribute,
- IN IA32_MAP_ATTRIBUTE *Mask
+ IN UINTN Level,
+ IN OUT volatile IA32_PAGING_ENTRY *Ple,
+ IN UINT64 Offset,
+ IN IA32_MAP_ATTRIBUTE *Attribute,
+ IN IA32_MAP_ATTRIBUTE *Mask
)
{
if (Level == 1) {
@@ -195,12 +195,12 @@ PageTableLibSetPle (
**/
VOID
PageTableLibSetPnle (
- IN OUT IA32_PAGE_NON_LEAF_ENTRY *Pnle,
- IN IA32_MAP_ATTRIBUTE *Attribute,
- IN IA32_MAP_ATTRIBUTE *Mask
+ IN OUT volatile IA32_PAGE_NON_LEAF_ENTRY *Pnle,
+ IN IA32_MAP_ATTRIBUTE *Attribute,
+ IN IA32_MAP_ATTRIBUTE *Mask
)
{
- IA32_PAGE_NON_LEAF_ENTRY LocalPnle;
+ volatile IA32_PAGE_NON_LEAF_ENTRY LocalPnle;
LocalPnle.Uint64 = Pnle->Uint64;
if (Mask->Bits.Present) {
--
2.31.1.windows.1
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next reply other threads:[~2024-02-23 8:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 8:41 Zhou Jianfeng [this message]
2024-02-23 11:59 ` [edk2-devel] [PATCH] UefiCpuPkg/CpuPageTableLib: qualify page table accesses as volatile Michael Brown
2024-02-23 15:12 ` Zhou, Jianfeng
2024-02-23 15:51 ` Michael Brown
2024-02-25 13:47 ` Laszlo Ersek
-- strict thread matches above, loose matches on Subject: below --
2024-03-01 2:54 Zhou Jianfeng
2024-03-01 11:50 ` Michael Brown
2024-03-01 12:21 ` Laszlo Ersek
2024-03-01 18:56 ` Laszlo Ersek
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