From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <ak@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Andy Lutomirski <luto@amacapital.net>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv1, RFC 7/8] x86/mm: Hacks for boot-time switching between 4- and 5-level paging
Date: Thu, 25 May 2017 23:33:33 +0300 [thread overview]
Message-ID: <20170525203334.867-8-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20170525203334.867-1-kirill.shutemov@linux.intel.com>
There're bunch of workaround to make switching between 4- and 5-level
paging compile.
All of them need to be addressed properly before upstreaming.
Not-yet-signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/Kconfig | 4 ++--
arch/x86/entry/entry_64.S | 5 +++++
arch/x86/kernel/head_64.S | 6 ++++--
arch/x86/xen/Kconfig | 2 +-
4 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0bf81e837cbf..c795207d8a3c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -100,7 +100,7 @@ config X86
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
select HAVE_ARCH_JUMP_LABEL
- select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
+ select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP && !X86_5LEVEL
select HAVE_ARCH_KGDB
select HAVE_ARCH_KMEMCHECK
select HAVE_ARCH_MMAP_RND_BITS if MMU
@@ -1980,7 +1980,7 @@ config RELOCATABLE
config RANDOMIZE_BASE
bool "Randomize the address of the kernel image (KASLR)"
- depends on RELOCATABLE
+ depends on RELOCATABLE && !X86_5LEVEL
default y
---help---
In support of Kernel Address Space Layout Randomization (KASLR),
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index edec30584eb8..9e868fd6d792 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -269,6 +269,11 @@ return_from_SYSCALL_64:
* Change top bits to match most significant bit (47th or 56th bit
* depending on paging mode) in the address.
*/
+#ifdef CONFIG_X86_5LEVEL
+#warning FIXME
+#undef __VIRTUAL_MASK_SHIFT
+#define __VIRTUAL_MASK_SHIFT 56
+#endif
shl $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx
sar $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 2009d9849e98..9dcf7a4d8612 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -37,11 +37,13 @@
*
*/
-#define p4d_index(x) (((x) >> P4D_SHIFT) & (PTRS_PER_P4D-1))
#define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
-PGD_PAGE_OFFSET = pgd_index(__PAGE_OFFSET_BASE)
+#ifdef CONFIG_XEN
+/* FIXME */
+PGD_PAGE_OFFSET = pgd_index(__PAGE_OFFSET_BASE48)
PGD_START_KERNEL = pgd_index(__START_KERNEL_map)
+#endif
L3_START_KERNEL = pud_index(__START_KERNEL_map)
.text
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 1be9667bd476..c1714cac7595 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -4,7 +4,7 @@
config XEN
bool "Xen guest support"
- depends on PARAVIRT
+ depends on PARAVIRT && !X86_5LEVEL
select PARAVIRT_CLOCK
depends on X86_64 || (X86_32 && X86_PAE)
depends on X86_LOCAL_APIC && X86_TSC
--
2.11.0
--
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next prev parent reply other threads:[~2017-05-25 20:35 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-25 20:33 [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 1/8] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 2/8] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 3/8] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 4/8] x86/mm: Handle boot-time paging mode switching at early boot Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 5/8] x86/mm: Fold p4d page table layer at runtime Kirill A. Shutemov
2017-05-27 15:09 ` Brian Gerst
2017-05-27 22:46 ` Kirill A. Shutemov
2017-05-27 22:56 ` Brian Gerst
2017-05-25 20:33 ` [PATCHv1, RFC 6/8] x86/mm: Replace compile-time checks for 5-level with runtime-time Kirill A. Shutemov
2017-05-25 20:33 ` Kirill A. Shutemov [this message]
2017-05-26 22:10 ` KASAN vs. boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-05-29 10:02 ` Dmitry Vyukov
2017-05-29 11:18 ` Andrey Ryabinin
2017-05-29 11:19 ` Dmitry Vyukov
2017-05-29 11:45 ` Andrey Ryabinin
2017-05-29 12:46 ` Andrey Ryabinin
2017-06-01 14:56 ` Andrey Ryabinin
2017-07-10 12:33 ` Kirill A. Shutemov
2017-07-10 12:43 ` Dmitry Vyukov
2017-07-10 14:17 ` Kirill A. Shutemov
2017-07-10 15:56 ` Andy Lutomirski
2017-07-10 18:47 ` Kirill A. Shutemov
2017-07-10 20:07 ` Andy Lutomirski
2017-07-10 21:24 ` Kirill A. Shutemov
2017-07-11 0:30 ` Andy Lutomirski
2017-07-11 10:35 ` Kirill A. Shutemov
2017-07-11 15:06 ` Andy Lutomirski
2017-07-11 15:15 ` Andrey Ryabinin
2017-07-11 16:45 ` Andrey Ryabinin
2017-07-11 17:03 ` Kirill A. Shutemov
2017-07-11 17:29 ` Andrey Ryabinin
2017-07-11 19:05 ` Kirill A. Shutemov
2017-07-13 12:58 ` Andrey Ryabinin
2017-07-13 13:52 ` Kirill A. Shutemov
2017-07-13 14:15 ` Kirill A. Shutemov
2017-07-13 14:19 ` Andrey Ryabinin
2017-07-24 12:13 ` Kirill A. Shutemov
2017-07-24 14:07 ` Andrey Ryabinin
2017-07-10 16:57 ` Andrey Ryabinin
2017-05-25 20:33 ` [PATCHv1, RFC 8/8] x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y Kirill A. Shutemov
2017-05-25 23:24 ` [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging Linus Torvalds
2017-05-26 0:40 ` Andy Lutomirski
2017-05-26 4:18 ` Kevin Easton
2017-05-26 7:21 ` Andy Lutomirski
2017-05-26 13:00 ` Kirill A. Shutemov
2017-05-26 13:35 ` Andi Kleen
2017-05-26 15:51 ` Linus Torvalds
2017-05-26 15:58 ` Kirill A. Shutemov
2017-05-26 16:13 ` Linus Torvalds
2017-05-26 18:24 ` hpa
2017-05-26 19:23 ` Dave Hansen
2017-05-26 19:36 ` hpa
2017-05-26 19:40 ` hpa
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