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Subject[PATCH v10 06/26] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW
Date
Before introducing _PAGE_COW for non-hardware memory management purposes in
the next patch, rename _PAGE_DIRTY to _PAGE_DIRTY_HW and _PAGE_BIT_DIRTY to
_PAGE_BIT_DIRTY_HW to make meanings more clear. There are no functional
changes from this patch.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
---
v9:
- At some places _PAGE_DIRTY were not changed to _PAGE_DIRTY_HW, because
they will be changed again in the next patch to _PAGE_DIRTY_BITS.
However, this causes compile issues if the next patch is not yet applied.
Fix it by changing all _PAGE_DIRTY to _PAGE_DRITY_HW.

arch/x86/include/asm/pgtable.h | 18 +++++++++---------
arch/x86/include/asm/pgtable_types.h | 11 +++++------
arch/x86/kernel/relocate_kernel_64.S | 2 +-
arch/x86/kvm/vmx/vmx.c | 2 +-
4 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 4d02e64af1b3..90f9a73881ad 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -124,7 +124,7 @@ extern pmdval_t early_pmd_flags;
*/
static inline int pte_dirty(pte_t pte)
{
- return pte_flags(pte) & _PAGE_DIRTY;
+ return pte_flags(pte) & _PAGE_DIRTY_HW;
}


@@ -163,7 +163,7 @@ static inline int pte_young(pte_t pte)

static inline int pmd_dirty(pmd_t pmd)
{
- return pmd_flags(pmd) & _PAGE_DIRTY;
+ return pmd_flags(pmd) & _PAGE_DIRTY_HW;
}

static inline int pmd_young(pmd_t pmd)
@@ -173,7 +173,7 @@ static inline int pmd_young(pmd_t pmd)

static inline int pud_dirty(pud_t pud)
{
- return pud_flags(pud) & _PAGE_DIRTY;
+ return pud_flags(pud) & _PAGE_DIRTY_HW;
}

static inline int pud_young(pud_t pud)
@@ -333,7 +333,7 @@ static inline pte_t pte_clear_uffd_wp(pte_t pte)

static inline pte_t pte_mkclean(pte_t pte)
{
- return pte_clear_flags(pte, _PAGE_DIRTY);
+ return pte_clear_flags(pte, _PAGE_DIRTY_HW);
}

static inline pte_t pte_mkold(pte_t pte)
@@ -353,7 +353,7 @@ static inline pte_t pte_mkexec(pte_t pte)

static inline pte_t pte_mkdirty(pte_t pte)
{
- return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
+ return pte_set_flags(pte, _PAGE_DIRTY_HW | _PAGE_SOFT_DIRTY);
}

static inline pte_t pte_mkyoung(pte_t pte)
@@ -434,7 +434,7 @@ static inline pmd_t pmd_mkold(pmd_t pmd)

static inline pmd_t pmd_mkclean(pmd_t pmd)
{
- return pmd_clear_flags(pmd, _PAGE_DIRTY);
+ return pmd_clear_flags(pmd, _PAGE_DIRTY_HW);
}

static inline pmd_t pmd_wrprotect(pmd_t pmd)
@@ -444,7 +444,7 @@ static inline pmd_t pmd_wrprotect(pmd_t pmd)

static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
- return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
+ return pmd_set_flags(pmd, _PAGE_DIRTY_HW | _PAGE_SOFT_DIRTY);
}

static inline pmd_t pmd_mkdevmap(pmd_t pmd)
@@ -488,7 +488,7 @@ static inline pud_t pud_mkold(pud_t pud)

static inline pud_t pud_mkclean(pud_t pud)
{
- return pud_clear_flags(pud, _PAGE_DIRTY);
+ return pud_clear_flags(pud, _PAGE_DIRTY_HW);
}

static inline pud_t pud_wrprotect(pud_t pud)
@@ -498,7 +498,7 @@ static inline pud_t pud_wrprotect(pud_t pud)

static inline pud_t pud_mkdirty(pud_t pud)
{
- return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
+ return pud_set_flags(pud, _PAGE_DIRTY_HW | _PAGE_SOFT_DIRTY);
}

static inline pud_t pud_mkdevmap(pud_t pud)
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index b6606fe6cfdf..b82e0f167879 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -15,7 +15,7 @@
#define _PAGE_BIT_PWT 3 /* page write through */
#define _PAGE_BIT_PCD 4 /* page cache disabled */
#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
-#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
+#define _PAGE_BIT_DIRTY_HW 6 /* was written to (raised by CPU) */
#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
#define _PAGE_BIT_PAT 7 /* on 4KB pages */
#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
@@ -46,7 +46,7 @@
#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
-#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
+#define _PAGE_DIRTY_HW (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY_HW)
#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
#define _PAGE_SOFTW1 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
@@ -74,7 +74,7 @@
_PAGE_PKEY_BIT3)

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
-#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
+#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY_HW | _PAGE_ACCESSED)
#else
#define _PAGE_KNL_ERRATUM_MASK 0
#endif
@@ -126,7 +126,7 @@
* pte_modify() does modify it.
*/
#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
- _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
+ _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY_HW | \
_PAGE_SOFT_DIRTY | _PAGE_DEVMAP | _PAGE_ENC | \
_PAGE_UFFD_WP)
#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
@@ -163,7 +163,7 @@ enum page_cache_mode {
#define __RW _PAGE_RW
#define _USR _PAGE_USER
#define ___A _PAGE_ACCESSED
-#define ___D _PAGE_DIRTY
+#define ___D _PAGE_DIRTY_HW
#define ___G _PAGE_GLOBAL
#define __NX _PAGE_NX

@@ -205,7 +205,6 @@ enum page_cache_mode {
#define __PAGE_KERNEL_IO __PAGE_KERNEL
#define __PAGE_KERNEL_IO_NOCACHE __PAGE_KERNEL_NOCACHE

-
#ifndef __ASSEMBLY__

#define __PAGE_KERNEL_ENC (__PAGE_KERNEL | _ENC)
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index a4d9a261425b..e3bb4ff95523 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -17,7 +17,7 @@
*/

#define PTR(x) (x << 3)
-#define PAGE_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define PAGE_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY_HW)

/*
* control_page + KEXEC_CONTROL_CODE_MAX_SIZE
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c2c6335a998c..d52d470e36b1 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3501,7 +3501,7 @@ static int init_rmode_identity_map(struct kvm *kvm)
/* Set up identity-mapping pagetable for EPT in real mode */
for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
- _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
+ _PAGE_ACCESSED | _PAGE_DIRTY_HW | _PAGE_PSE);
r = kvm_write_guest_page(kvm, identity_map_pfn,
&tmp, i * sizeof(tmp), sizeof(tmp));
if (r < 0)
--
2.21.0
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