diff options
| author | Will Deacon <will.deacon@arm.com> | 2017-08-10 12:56:18 +0100 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2018-01-22 13:16:20 +0530 |
| commit | 7745646aac250b3593a967ea0ae819e36bea60eb (patch) | |
| tree | a77292b0fb4e2aef1ff7751548e617e077c1821a /arch/arm64/include | |
| parent | 46612f098cb38d21fccbcc0777a6fd9a2b699055 (diff) | |
FROMLIST: arm64: mm: Use non-global mappings for kernel space
In preparation for unmapping the kernel whilst running in userspace,
make the kernel mappings non-global so we can avoid expensive TLB
invalidation on kernel exit to userspace.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
commit e046eb0c9bf26d94be9e4592c00c7a78b0fa9bfd)
Change-Id: If53d6db042f8fefff3ecf8a7658291e1f1ac659f
[ghackmann@google.com: apply pgtable-prot.h changes to pgtable.h instead]
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kernel-pgtable.h | 12 | ||||
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 17 |
2 files changed, 23 insertions, 6 deletions
diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h index 7803343e5881..77a27af01371 100644 --- a/arch/arm64/include/asm/kernel-pgtable.h +++ b/arch/arm64/include/asm/kernel-pgtable.h @@ -78,8 +78,16 @@ /* * Initial memory map attributes. */ -#define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) -#define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) +#define _SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) +#define _SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) + +#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 +#define SWAPPER_PTE_FLAGS (_SWAPPER_PTE_FLAGS | PTE_NG) +#define SWAPPER_PMD_FLAGS (_SWAPPER_PMD_FLAGS | PMD_SECT_NG) +#else +#define SWAPPER_PTE_FLAGS _SWAPPER_PTE_FLAGS +#define SWAPPER_PMD_FLAGS _SWAPPER_PMD_FLAGS +#endif #if ARM64_SWAPPER_USES_SECTION_MAPS #define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 7312b0cecfd3..985900ca8b62 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -61,8 +61,16 @@ extern void __pmd_error(const char *file, int line, unsigned long val); extern void __pud_error(const char *file, int line, unsigned long val); extern void __pgd_error(const char *file, int line, unsigned long val); -#define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) -#define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) +#define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) +#define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) + +#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 +#define PROT_DEFAULT (_PROT_DEFAULT | PTE_NG) +#define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_SECT_NG) +#else +#define PROT_DEFAULT _PROT_DEFAULT +#define PROT_SECT_DEFAULT _PROT_SECT_DEFAULT +#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ #define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) @@ -75,6 +83,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) #define _PAGE_DEFAULT (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) +#define _HYP_PAGE_DEFAULT (_PAGE_DEFAULT & ~PTE_NG) #define PAGE_KERNEL __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE) #define PAGE_KERNEL_RO __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_RDONLY) @@ -82,13 +91,13 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define PAGE_KERNEL_EXEC __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE) #define PAGE_KERNEL_EXEC_CONT __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_CONT) -#define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP) +#define PAGE_HYP __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP) #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) #define PAGE_S2 __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_UXN) -#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_PXN | PTE_UXN) +#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_NG | PTE_PXN | PTE_UXN) #define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) #define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) #define PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) |