diff mbox

[01/29] arm64: mm: Use non-global mappings for kernel space

Message ID 1519790211-16582-2-git-send-email-alex.shi@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Alex Shi Feb. 28, 2018, 3:56 a.m. UTC 
From: Will Deacon <will.deacon@arm.com>

commit e046eb0c9bf2 upstream.

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>
Signed-off-by: Alex Shi <alex.shi@linaro.org>

Conflicts:
	skip PTE_RDONLY of PAGE_NONE in arch/arm64/include/asm/pgtable-prot.h
---
 arch/arm64/include/asm/kernel-pgtable.h | 12 ++++++++++--
 arch/arm64/include/asm/pgtable-prot.h   | 21 +++++++++++++++------
 2 files changed, 25 insertions(+), 8 deletions(-)

Comments

Greg Kroah-Hartman Feb. 28, 2018, 12:08 p.m. UTC | #1 
On Wed, Feb 28, 2018 at 11:56:23AM +0800, Alex Shi wrote:
> From: Will Deacon <will.deacon@arm.com>
> 
> commit e046eb0c9bf2 upstream.
> 
> 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>
> Signed-off-by: Alex Shi <alex.shi@linaro.org>
> 
> Conflicts:
> 	skip PTE_RDONLY of PAGE_NONE in arch/arm64/include/asm/pgtable-prot.h

These "Conflicts:" lines need to be removed, or put below the --- line
please.

thanks,

greg k-h
Alex Shi March 1, 2018, 11:53 a.m. UTC | #2 
On 02/28/2018 08:08 PM, Greg KH wrote:
> On Wed, Feb 28, 2018 at 11:56:23AM +0800, Alex Shi wrote:
>> From: Will Deacon <will.deacon@arm.com>
>>
>> commit e046eb0c9bf2 upstream.
>>
>> 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>
>> Signed-off-by: Alex Shi <alex.shi@linaro.org>
>>
>> Conflicts:
>> 	skip PTE_RDONLY of PAGE_NONE in arch/arm64/include/asm/pgtable-prot.h
> 
> These "Conflicts:" lines need to be removed, or put below the --- line
> please.
> 

Thanks response! Greg,

There are still a boot hang on one of renesas board on
CONFIG_RANDOMIZE_BASE. I am trying to get help from Renesas guys help on
this. I will back after fix it.

https://kernelci.org/boot/id/5a96f3dd59b5146590b3a4d5/

Thanks
Alex
diff mbox

Patch

diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h
index 7e51d1b..e4ddac9 100644
--- a/arch/arm64/include/asm/kernel-pgtable.h
+++ b/arch/arm64/include/asm/kernel-pgtable.h
@@ -71,8 +71,16 @@ 
 /*
  * 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-prot.h b/arch/arm64/include/asm/pgtable-prot.h
index 2142c77..84b5283 100644
--- a/arch/arm64/include/asm/pgtable-prot.h
+++ b/arch/arm64/include/asm/pgtable-prot.h
@@ -34,8 +34,16 @@ 
 
 #include <asm/pgtable-types.h>
 
-#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))
@@ -48,6 +56,7 @@ 
 #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)
@@ -55,15 +64,15 @@ 
 #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 | PTE_HYP_XN)
-#define PAGE_HYP_EXEC		__pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
-#define PAGE_HYP_RO		__pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
+#define PAGE_HYP		__pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
+#define PAGE_HYP_EXEC		__pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
+#define PAGE_HYP_RO		__pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
 #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)