[gentoo-commits] proj/linux-patches:4.4 commit in: /

[Mike Pagano]

commit:     811e116d5209f072b7f2e0ee2a37d1eabcbeaccb
Author:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
AuthorDate: Wed Aug 15 16:44:45 2018 +0000
Commit:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
CommitDate: Wed Nov 21 15:01:09 2018 +0000
URL:        https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=811e116d

Linux patch 4.4.148

Signed-off-by: Mike Pagano <mpagano <AT> gentoo.org>

 0000_README              |    4 +
 1147_linux-4.4.148.patch | 1873 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1877 insertions(+)

diff --git a/0000_README b/0000_README
index 84033e9..99860c8 100644
--- a/0000_README
+++ b/0000_README
@@ -631,6 +631,10 @@ Patch:  1146_linux-4.4.147.patch
 From:   http://www.kernel.org
 Desc:   Linux 4.4.147
 
+Patch:  1147_linux-4.4.148.patch
+From:   http://www.kernel.org
+Desc:   Linux 4.4.148
+
 Patch:  1500_XATTR_USER_PREFIX.patch
 From:   https://bugs.gentoo.org/show_bug.cgi?id=470644
 Desc:   Support for namespace user.pax.* on tmpfs.

diff --git a/1147_linux-4.4.148.patch b/1147_linux-4.4.148.patch
new file mode 100644
index 0000000..ea24e41
--- /dev/null
+++ b/1147_linux-4.4.148.patch
@@ -0,0 +1,1873 @@
+diff --git a/Makefile b/Makefile
+index ee92a12e3a4b..9b795164122e 100644
+--- a/Makefile
++++ b/Makefile
+@@ -1,6 +1,6 @@
+ VERSION = 4
+ PATCHLEVEL = 4
+-SUBLEVEL = 147
++SUBLEVEL = 148
+ EXTRAVERSION =
+ NAME = Blurry Fish Butt
+ 
+diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
+index 167f77b3bd43..6963dff815dc 100644
+--- a/arch/arm/boot/dts/imx6sx.dtsi
++++ b/arch/arm/boot/dts/imx6sx.dtsi
+@@ -1250,7 +1250,7 @@
+ 				  /* non-prefetchable memory */
+ 				  0x82000000 0 0x08000000 0x08000000 0 0x00f00000>;
+ 			num-lanes = <1>;
+-			interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
++			interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
+ 			clocks = <&clks IMX6SX_CLK_PCIE_REF_125M>,
+ 				 <&clks IMX6SX_CLK_PCIE_AXI>,
+ 				 <&clks IMX6SX_CLK_LVDS1_OUT>,
+diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
+index 729f89163bc3..210b3d675261 100644
+--- a/arch/parisc/Kconfig
++++ b/arch/parisc/Kconfig
+@@ -177,7 +177,7 @@ config PREFETCH
+ 
+ config MLONGCALLS
+ 	bool "Enable the -mlong-calls compiler option for big kernels"
+-	def_bool y if (!MODULES)
++	default y
+ 	depends on PA8X00
+ 	help
+ 	  If you configure the kernel to include many drivers built-in instead
+diff --git a/arch/parisc/include/asm/barrier.h b/arch/parisc/include/asm/barrier.h
+new file mode 100644
+index 000000000000..dbaaca84f27f
+--- /dev/null
++++ b/arch/parisc/include/asm/barrier.h
+@@ -0,0 +1,32 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef __ASM_BARRIER_H
++#define __ASM_BARRIER_H
++
++#ifndef __ASSEMBLY__
++
++/* The synchronize caches instruction executes as a nop on systems in
++   which all memory references are performed in order. */
++#define synchronize_caches() __asm__ __volatile__ ("sync" : : : "memory")
++
++#if defined(CONFIG_SMP)
++#define mb()		do { synchronize_caches(); } while (0)
++#define rmb()		mb()
++#define wmb()		mb()
++#define dma_rmb()	mb()
++#define dma_wmb()	mb()
++#else
++#define mb()		barrier()
++#define rmb()		barrier()
++#define wmb()		barrier()
++#define dma_rmb()	barrier()
++#define dma_wmb()	barrier()
++#endif
++
++#define __smp_mb()	mb()
++#define __smp_rmb()	mb()
++#define __smp_wmb()	mb()
++
++#include <asm-generic/barrier.h>
++
++#endif /* !__ASSEMBLY__ */
++#endif /* __ASM_BARRIER_H */
+diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
+index 5dc831955de5..13cb2461fef5 100644
+--- a/arch/parisc/kernel/entry.S
++++ b/arch/parisc/kernel/entry.S
+@@ -481,6 +481,8 @@
+ 	/* Release pa_tlb_lock lock without reloading lock address. */
+ 	.macro		tlb_unlock0	spc,tmp
+ #ifdef CONFIG_SMP
++	or,COND(=)	%r0,\spc,%r0
++	sync
+ 	or,COND(=)	%r0,\spc,%r0
+ 	stw             \spc,0(\tmp)
+ #endif
+diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S
+index 16073f472118..b3434a7fd3c9 100644
+--- a/arch/parisc/kernel/pacache.S
++++ b/arch/parisc/kernel/pacache.S
+@@ -354,6 +354,7 @@ ENDPROC(flush_data_cache_local)
+ 	.macro	tlb_unlock	la,flags,tmp
+ #ifdef CONFIG_SMP
+ 	ldi		1,\tmp
++	sync
+ 	stw		\tmp,0(\la)
+ 	mtsm		\flags
+ #endif
+diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
+index 9f22195b90ed..f68eedc72484 100644
+--- a/arch/parisc/kernel/syscall.S
++++ b/arch/parisc/kernel/syscall.S
+@@ -631,6 +631,7 @@ cas_action:
+ 	sub,<>	%r28, %r25, %r0
+ 2:	stw,ma	%r24, 0(%r26)
+ 	/* Free lock */
++	sync
+ 	stw,ma	%r20, 0(%sr2,%r20)
+ #if ENABLE_LWS_DEBUG
+ 	/* Clear thread register indicator */
+@@ -645,6 +646,7 @@ cas_action:
+ 3:		
+ 	/* Error occurred on load or store */
+ 	/* Free lock */
++	sync
+ 	stw	%r20, 0(%sr2,%r20)
+ #if ENABLE_LWS_DEBUG
+ 	stw	%r0, 4(%sr2,%r20)
+@@ -846,6 +848,7 @@ cas2_action:
+ 
+ cas2_end:
+ 	/* Free lock */
++	sync
+ 	stw,ma	%r20, 0(%sr2,%r20)
+ 	/* Enable interrupts */
+ 	ssm	PSW_SM_I, %r0
+@@ -856,6 +859,7 @@ cas2_end:
+ 22:
+ 	/* Error occurred on load or store */
+ 	/* Free lock */
++	sync
+ 	stw	%r20, 0(%sr2,%r20)
+ 	ssm	PSW_SM_I, %r0
+ 	ldo	1(%r0),%r28
+diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
+index f4b175db70f4..dd2269dcbc47 100644
+--- a/arch/x86/include/asm/cpufeatures.h
++++ b/arch/x86/include/asm/cpufeatures.h
+@@ -193,12 +193,12 @@
+ #define X86_FEATURE_HW_PSTATE	( 7*32+ 8) /* AMD HW-PState */
+ #define X86_FEATURE_PROC_FEEDBACK ( 7*32+ 9) /* AMD ProcFeedbackInterface */
+ 
++#define X86_FEATURE_RETPOLINE	( 7*32+12) /* "" Generic Retpoline mitigation for Spectre variant 2 */
++#define X86_FEATURE_RETPOLINE_AMD ( 7*32+13) /* "" AMD Retpoline mitigation for Spectre variant 2 */
++
+ #define X86_FEATURE_INTEL_PT	( 7*32+15) /* Intel Processor Trace */
+ #define X86_FEATURE_RSB_CTXSW	( 7*32+19) /* "" Fill RSB on context switches */
+ 
+-#define X86_FEATURE_RETPOLINE	( 7*32+29) /* "" Generic Retpoline mitigation for Spectre variant 2 */
+-#define X86_FEATURE_RETPOLINE_AMD ( 7*32+30) /* "" AMD Retpoline mitigation for Spectre variant 2 */
+-
+ #define X86_FEATURE_MSR_SPEC_CTRL ( 7*32+16) /* "" MSR SPEC_CTRL is implemented */
+ #define X86_FEATURE_SSBD	( 7*32+17) /* Speculative Store Bypass Disable */
+ 
+@@ -214,7 +214,7 @@
+ #define X86_FEATURE_IBPB	( 7*32+26) /* Indirect Branch Prediction Barrier */
+ #define X86_FEATURE_STIBP	( 7*32+27) /* Single Thread Indirect Branch Predictors */
+ #define X86_FEATURE_ZEN		( 7*32+28) /* "" CPU is AMD family 0x17 (Zen) */
+-
++#define X86_FEATURE_L1TF_PTEINV	( 7*32+29) /* "" L1TF workaround PTE inversion */
+ 
+ /* Virtualization flags: Linux defined, word 8 */
+ #define X86_FEATURE_TPR_SHADOW  ( 8*32+ 0) /* Intel TPR Shadow */
+@@ -310,6 +310,7 @@
+ #define X86_FEATURE_AVX512_4FMAPS	(18*32+ 3) /* AVX-512 Multiply Accumulation Single precision */
+ #define X86_FEATURE_SPEC_CTRL		(18*32+26) /* "" Speculation Control (IBRS + IBPB) */
+ #define X86_FEATURE_INTEL_STIBP		(18*32+27) /* "" Single Thread Indirect Branch Predictors */
++#define X86_FEATURE_FLUSH_L1D		(18*32+28) /* Flush L1D cache */
+ #define X86_FEATURE_ARCH_CAPABILITIES	(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
+ #define X86_FEATURE_SPEC_CTRL_SSBD	(18*32+31) /* "" Speculative Store Bypass Disable */
+ 
+@@ -331,5 +332,6 @@
+ #define X86_BUG_SPECTRE_V1	X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */
+ #define X86_BUG_SPECTRE_V2	X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */
+ #define X86_BUG_SPEC_STORE_BYPASS X86_BUG(17) /* CPU is affected by speculative store bypass attack */
++#define X86_BUG_L1TF		X86_BUG(18) /* CPU is affected by L1 Terminal Fault */
+ 
+ #endif /* _ASM_X86_CPUFEATURES_H */
+diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
+index 0056bc945cd1..cb7f04981c6b 100644
+--- a/arch/x86/include/asm/irqflags.h
++++ b/arch/x86/include/asm/irqflags.h
+@@ -8,6 +8,8 @@
+  * Interrupt control:
+  */
+ 
++/* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */
++extern inline unsigned long native_save_fl(void);
+ extern inline unsigned long native_save_fl(void)
+ {
+ 	unsigned long flags;
+diff --git a/arch/x86/include/asm/page_32_types.h b/arch/x86/include/asm/page_32_types.h
+index 3a52ee0e726d..bfceb5cc6347 100644
+--- a/arch/x86/include/asm/page_32_types.h
++++ b/arch/x86/include/asm/page_32_types.h
+@@ -27,8 +27,13 @@
+ #define N_EXCEPTION_STACKS 1
+ 
+ #ifdef CONFIG_X86_PAE
+-/* 44=32+12, the limit we can fit into an unsigned long pfn */
+-#define __PHYSICAL_MASK_SHIFT	44
++/*
++ * This is beyond the 44 bit limit imposed by the 32bit long pfns,
++ * but we need the full mask to make sure inverted PROT_NONE
++ * entries have all the host bits set in a guest.
++ * The real limit is still 44 bits.
++ */
++#define __PHYSICAL_MASK_SHIFT	52
+ #define __VIRTUAL_MASK_SHIFT	32
+ 
+ #else  /* !CONFIG_X86_PAE */
+diff --git a/arch/x86/include/asm/pgtable-2level.h b/arch/x86/include/asm/pgtable-2level.h
+index fd74a11959de..89c50332a71e 100644
+--- a/arch/x86/include/asm/pgtable-2level.h
++++ b/arch/x86/include/asm/pgtable-2level.h
+@@ -77,4 +77,21 @@ static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshi
+ #define __pte_to_swp_entry(pte)		((swp_entry_t) { (pte).pte_low })
+ #define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })
+ 
++/* No inverted PFNs on 2 level page tables */
++
++static inline u64 protnone_mask(u64 val)
++{
++	return 0;
++}
++
++static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask)
++{
++	return val;
++}
++
++static inline bool __pte_needs_invert(u64 val)
++{
++	return false;
++}
++
+ #endif /* _ASM_X86_PGTABLE_2LEVEL_H */
+diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h
+index cdaa58c9b39e..5c686382d84b 100644
+--- a/arch/x86/include/asm/pgtable-3level.h
++++ b/arch/x86/include/asm/pgtable-3level.h
+@@ -177,11 +177,44 @@ static inline pmd_t native_pmdp_get_and_clear(pmd_t *pmdp)
+ #endif
+ 
+ /* Encode and de-code a swap entry */
++#define SWP_TYPE_BITS		5
++
++#define SWP_OFFSET_FIRST_BIT	(_PAGE_BIT_PROTNONE + 1)
++
++/* We always extract/encode the offset by shifting it all the way up, and then down again */
++#define SWP_OFFSET_SHIFT	(SWP_OFFSET_FIRST_BIT + SWP_TYPE_BITS)
++
+ #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5)
+ #define __swp_type(x)			(((x).val) & 0x1f)
+ #define __swp_offset(x)			((x).val >> 5)
+ #define __swp_entry(type, offset)	((swp_entry_t){(type) | (offset) << 5})
+-#define __pte_to_swp_entry(pte)		((swp_entry_t){ (pte).pte_high })
+-#define __swp_entry_to_pte(x)		((pte_t){ { .pte_high = (x).val } })
++
++/*
++ * Normally, __swp_entry() converts from arch-independent swp_entry_t to
++ * arch-dependent swp_entry_t, and __swp_entry_to_pte() just stores the result
++ * to pte. But here we have 32bit swp_entry_t and 64bit pte, and need to use the
++ * whole 64 bits. Thus, we shift the "real" arch-dependent conversion to
++ * __swp_entry_to_pte() through the following helper macro based on 64bit
++ * __swp_entry().
++ */
++#define __swp_pteval_entry(type, offset) ((pteval_t) { \
++	(~(pteval_t)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
++	| ((pteval_t)(type) << (64 - SWP_TYPE_BITS)) })
++
++#define __swp_entry_to_pte(x)	((pte_t){ .pte = \
++		__swp_pteval_entry(__swp_type(x), __swp_offset(x)) })
++/*
++ * Analogically, __pte_to_swp_entry() doesn't just extract the arch-dependent
++ * swp_entry_t, but also has to convert it from 64bit to the 32bit
++ * intermediate representation, using the following macros based on 64bit
++ * __swp_type() and __swp_offset().
++ */
++#define __pteval_swp_type(x) ((unsigned long)((x).pte >> (64 - SWP_TYPE_BITS)))
++#define __pteval_swp_offset(x) ((unsigned long)(~((x).pte) << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT))
++
++#define __pte_to_swp_entry(pte)	(__swp_entry(__pteval_swp_type(pte), \
++					     __pteval_swp_offset(pte)))
++
++#include <asm/pgtable-invert.h>
+ 
+ #endif /* _ASM_X86_PGTABLE_3LEVEL_H */
+diff --git a/arch/x86/include/asm/pgtable-invert.h b/arch/x86/include/asm/pgtable-invert.h
+new file mode 100644
+index 000000000000..44b1203ece12
+--- /dev/null
++++ b/arch/x86/include/asm/pgtable-invert.h
+@@ -0,0 +1,32 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _ASM_PGTABLE_INVERT_H
++#define _ASM_PGTABLE_INVERT_H 1
++
++#ifndef __ASSEMBLY__
++
++static inline bool __pte_needs_invert(u64 val)
++{
++	return !(val & _PAGE_PRESENT);
++}
++
++/* Get a mask to xor with the page table entry to get the correct pfn. */
++static inline u64 protnone_mask(u64 val)
++{
++	return __pte_needs_invert(val) ?  ~0ull : 0;
++}
++
++static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask)
++{
++	/*
++	 * When a PTE transitions from NONE to !NONE or vice-versa
++	 * invert the PFN part to stop speculation.
++	 * pte_pfn undoes this when needed.
++	 */
++	if (__pte_needs_invert(oldval) != __pte_needs_invert(val))
++		val = (val & ~mask) | (~val & mask);
++	return val;
++}
++
++#endif /* __ASSEMBLY__ */
++
++#endif
+diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
+index 84c62d950023..4de6c282c02a 100644
+--- a/arch/x86/include/asm/pgtable.h
++++ b/arch/x86/include/asm/pgtable.h
+@@ -148,19 +148,29 @@ static inline int pte_special(pte_t pte)
+ 	return pte_flags(pte) & _PAGE_SPECIAL;
+ }
+ 
++/* Entries that were set to PROT_NONE are inverted */
++
++static inline u64 protnone_mask(u64 val);
++
+ static inline unsigned long pte_pfn(pte_t pte)
+ {
+-	return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
++	phys_addr_t pfn = pte_val(pte);
++	pfn ^= protnone_mask(pfn);
++	return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
+ }
+ 
+ static inline unsigned long pmd_pfn(pmd_t pmd)
+ {
+-	return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
++	phys_addr_t pfn = pmd_val(pmd);
++	pfn ^= protnone_mask(pfn);
++	return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
+ }
+ 
+ static inline unsigned long pud_pfn(pud_t pud)
+ {
+-	return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
++	phys_addr_t pfn = pud_val(pud);
++	pfn ^= protnone_mask(pfn);
++	return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
+ }
+ 
+ #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
+@@ -305,11 +315,6 @@ static inline pmd_t pmd_mkwrite(pmd_t pmd)
+ 	return pmd_set_flags(pmd, _PAGE_RW);
+ }
+ 
+-static inline pmd_t pmd_mknotpresent(pmd_t pmd)
+-{
+-	return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
+-}
+-
+ #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
+ static inline int pte_soft_dirty(pte_t pte)
+ {
+@@ -359,19 +364,58 @@ static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
+ 
+ static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
+ {
+-	return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
+-		     massage_pgprot(pgprot));
++	phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
++	pfn ^= protnone_mask(pgprot_val(pgprot));
++	pfn &= PTE_PFN_MASK;
++	return __pte(pfn | massage_pgprot(pgprot));
+ }
+ 
+ static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
+ {
+-	return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
+-		     massage_pgprot(pgprot));
++	phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
++	pfn ^= protnone_mask(pgprot_val(pgprot));
++	pfn &= PHYSICAL_PMD_PAGE_MASK;
++	return __pmd(pfn | massage_pgprot(pgprot));
++}
++
++static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
++{
++	phys_addr_t pfn = page_nr << PAGE_SHIFT;
++	pfn ^= protnone_mask(pgprot_val(pgprot));
++	pfn &= PHYSICAL_PUD_PAGE_MASK;
++	return __pud(pfn | massage_pgprot(pgprot));
++}
++
++static inline pmd_t pmd_mknotpresent(pmd_t pmd)
++{
++	return pfn_pmd(pmd_pfn(pmd),
++		       __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
+ }
+ 
++static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
++{
++	pudval_t v = native_pud_val(pud);
++
++	return __pud(v | set);
++}
++
++static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
++{
++	pudval_t v = native_pud_val(pud);
++
++	return __pud(v & ~clear);
++}
++
++static inline pud_t pud_mkhuge(pud_t pud)
++{
++	return pud_set_flags(pud, _PAGE_PSE);
++}
++
++static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
++
+ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+ {
+-	pteval_t val = pte_val(pte);
++	pteval_t val = pte_val(pte), oldval = val;
+ 
+ 	/*
+ 	 * Chop off the NX bit (if present), and add the NX portion of
+@@ -379,17 +423,17 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+ 	 */
+ 	val &= _PAGE_CHG_MASK;
+ 	val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
+-
++	val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
+ 	return __pte(val);
+ }
+ 
+ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
+ {
+-	pmdval_t val = pmd_val(pmd);
++	pmdval_t val = pmd_val(pmd), oldval = val;
+ 
+ 	val &= _HPAGE_CHG_MASK;
+ 	val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
+-
++	val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
+ 	return __pmd(val);
+ }
+ 
+@@ -926,6 +970,14 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
+ }
+ #endif
+ 
++#define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
++extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
++
++static inline bool arch_has_pfn_modify_check(void)
++{
++	return boot_cpu_has_bug(X86_BUG_L1TF);
++}
++
+ #include <asm-generic/pgtable.h>
+ #endif	/* __ASSEMBLY__ */
+ 
+diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
+index c810226e741a..221a32ed1372 100644
+--- a/arch/x86/include/asm/pgtable_64.h
++++ b/arch/x86/include/asm/pgtable_64.h
+@@ -163,18 +163,52 @@ static inline int pgd_large(pgd_t pgd) { return 0; }
+ #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
+ #define pte_unmap(pte) ((void)(pte))/* NOP */
+ 
+-/* Encode and de-code a swap entry */
+-#define SWP_TYPE_BITS 5
+-#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
++/*
++ * Encode and de-code a swap entry
++ *
++ * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
++ * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
++ * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| X|X|SD|0| <- swp entry
++ *
++ * G (8) is aliased and used as a PROT_NONE indicator for
++ * !present ptes.  We need to start storing swap entries above
++ * there.  We also need to avoid using A and D because of an
++ * erratum where they can be incorrectly set by hardware on
++ * non-present PTEs.
++ *
++ * SD (1) in swp entry is used to store soft dirty bit, which helps us
++ * remember soft dirty over page migration
++ *
++ * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
++ * but also L and G.
++ *
++ * The offset is inverted by a binary not operation to make the high
++ * physical bits set.
++ */
++#define SWP_TYPE_BITS		5
++
++#define SWP_OFFSET_FIRST_BIT	(_PAGE_BIT_PROTNONE + 1)
++
++/* We always extract/encode the offset by shifting it all the way up, and then down again */
++#define SWP_OFFSET_SHIFT	(SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS)
+ 
+ #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
+ 
+-#define __swp_type(x)			(((x).val >> (_PAGE_BIT_PRESENT + 1)) \
+-					 & ((1U << SWP_TYPE_BITS) - 1))
+-#define __swp_offset(x)			((x).val >> SWP_OFFSET_SHIFT)
+-#define __swp_entry(type, offset)	((swp_entry_t) { \
+-					 ((type) << (_PAGE_BIT_PRESENT + 1)) \
+-					 | ((offset) << SWP_OFFSET_SHIFT) })
++/* Extract the high bits for type */
++#define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
++
++/* Shift up (to get rid of type), then down to get value */
++#define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT)
++
++/*
++ * Shift the offset up "too far" by TYPE bits, then down again
++ * The offset is inverted by a binary not operation to make the high
++ * physical bits set.
++ */
++#define __swp_entry(type, offset) ((swp_entry_t) { \
++	(~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
++	| ((unsigned long)(type) << (64-SWP_TYPE_BITS)) })
++
+ #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
+ #define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })
+ 
+@@ -201,6 +235,8 @@ extern void cleanup_highmap(void);
+ extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
+ extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
+ 
++#include <asm/pgtable-invert.h>
++
+ #endif /* !__ASSEMBLY__ */
+ 
+ #endif /* _ASM_X86_PGTABLE_64_H */
+diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
+index 8dba273da25a..7572ce32055e 100644
+--- a/arch/x86/include/asm/pgtable_types.h
++++ b/arch/x86/include/asm/pgtable_types.h
+@@ -70,15 +70,15 @@
+ /*
+  * Tracking soft dirty bit when a page goes to a swap is tricky.
+  * We need a bit which can be stored in pte _and_ not conflict
+- * with swap entry format. On x86 bits 6 and 7 are *not* involved
+- * into swap entry computation, but bit 6 is used for nonlinear
+- * file mapping, so we borrow bit 7 for soft dirty tracking.
++ * with swap entry format. On x86 bits 1-4 are *not* involved
++ * into swap entry computation, but bit 7 is used for thp migration,
++ * so we borrow bit 1 for soft dirty tracking.
+  *
+  * Please note that this bit must be treated as swap dirty page
+- * mark if and only if the PTE has present bit clear!
++ * mark if and only if the PTE/PMD has present bit clear!
+  */
+ #ifdef CONFIG_MEM_SOFT_DIRTY
+-#define _PAGE_SWP_SOFT_DIRTY	_PAGE_PSE
++#define _PAGE_SWP_SOFT_DIRTY	_PAGE_RW
+ #else
+ #define _PAGE_SWP_SOFT_DIRTY	(_AT(pteval_t, 0))
+ #endif
+diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
+index 8e415cf65457..a3a53955f01c 100644
+--- a/arch/x86/include/asm/processor.h
++++ b/arch/x86/include/asm/processor.h
+@@ -172,6 +172,11 @@ extern const struct seq_operations cpuinfo_op;
+ 
+ extern void cpu_detect(struct cpuinfo_x86 *c);
+ 
++static inline unsigned long l1tf_pfn_limit(void)
++{
++	return BIT(boot_cpu_data.x86_phys_bits - 1 - PAGE_SHIFT) - 1;
++}
++
+ extern void early_cpu_init(void);
+ extern void identify_boot_cpu(void);
+ extern void identify_secondary_cpu(struct cpuinfo_x86 *);
+diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
+index 12a8867071f3..34e4aaaf03d2 100644
+--- a/arch/x86/kernel/cpu/bugs.c
++++ b/arch/x86/kernel/cpu/bugs.c
+@@ -26,9 +26,11 @@
+ #include <asm/pgtable.h>
+ #include <asm/cacheflush.h>
+ #include <asm/intel-family.h>
++#include <asm/e820.h>
+ 
+ static void __init spectre_v2_select_mitigation(void);
+ static void __init ssb_select_mitigation(void);
++static void __init l1tf_select_mitigation(void);
+ 
+ /*
+  * Our boot-time value of the SPEC_CTRL MSR. We read it once so that any
+@@ -80,6 +82,8 @@ void __init check_bugs(void)
+ 	 */
+ 	ssb_select_mitigation();
+ 
++	l1tf_select_mitigation();
++
+ #ifdef CONFIG_X86_32
+ 	/*
+ 	 * Check whether we are able to run this kernel safely on SMP.
+@@ -309,23 +313,6 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
+ 	return cmd;
+ }
+ 
+-/* Check for Skylake-like CPUs (for RSB handling) */
+-static bool __init is_skylake_era(void)
+-{
+-	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+-	    boot_cpu_data.x86 == 6) {
+-		switch (boot_cpu_data.x86_model) {
+-		case INTEL_FAM6_SKYLAKE_MOBILE:
+-		case INTEL_FAM6_SKYLAKE_DESKTOP:
+-		case INTEL_FAM6_SKYLAKE_X:
+-		case INTEL_FAM6_KABYLAKE_MOBILE:
+-		case INTEL_FAM6_KABYLAKE_DESKTOP:
+-			return true;
+-		}
+-	}
+-	return false;
+-}
+-
+ static void __init spectre_v2_select_mitigation(void)
+ {
+ 	enum spectre_v2_mitigation_cmd cmd = spectre_v2_parse_cmdline();
+@@ -386,22 +373,15 @@ retpoline_auto:
+ 	pr_info("%s\n", spectre_v2_strings[mode]);
+ 
+ 	/*
+-	 * If neither SMEP nor PTI are available, there is a risk of
+-	 * hitting userspace addresses in the RSB after a context switch
+-	 * from a shallow call stack to a deeper one. To prevent this fill
+-	 * the entire RSB, even when using IBRS.
++	 * If spectre v2 protection has been enabled, unconditionally fill
++	 * RSB during a context switch; this protects against two independent
++	 * issues:
+ 	 *
+-	 * Skylake era CPUs have a separate issue with *underflow* of the
+-	 * RSB, when they will predict 'ret' targets from the generic BTB.
+-	 * The proper mitigation for this is IBRS. If IBRS is not supported
+-	 * or deactivated in favour of retpolines the RSB fill on context
+-	 * switch is required.
++	 *	- RSB underflow (and switch to BTB) on Skylake+
++	 *	- SpectreRSB variant of spectre v2 on X86_BUG_SPECTRE_V2 CPUs
+ 	 */
+-	if ((!boot_cpu_has(X86_FEATURE_KAISER) &&
+-	     !boot_cpu_has(X86_FEATURE_SMEP)) || is_skylake_era()) {
+-		setup_force_cpu_cap(X86_FEATURE_RSB_CTXSW);
+-		pr_info("Spectre v2 mitigation: Filling RSB on context switch\n");
+-	}
++	setup_force_cpu_cap(X86_FEATURE_RSB_CTXSW);
++	pr_info("Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch\n");
+ 
+ 	/* Initialize Indirect Branch Prediction Barrier if supported */
+ 	if (boot_cpu_has(X86_FEATURE_IBPB)) {
+@@ -652,6 +632,35 @@ void x86_spec_ctrl_setup_ap(void)
+ 		x86_amd_ssb_disable();
+ }
+ 
++#undef pr_fmt
++#define pr_fmt(fmt)	"L1TF: " fmt
++static void __init l1tf_select_mitigation(void)
++{
++	u64 half_pa;
++
++	if (!boot_cpu_has_bug(X86_BUG_L1TF))
++		return;
++
++#if CONFIG_PGTABLE_LEVELS == 2
++	pr_warn("Kernel not compiled for PAE. No mitigation for L1TF\n");
++	return;
++#endif
++
++	/*
++	 * This is extremely unlikely to happen because almost all
++	 * systems have far more MAX_PA/2 than RAM can be fit into
++	 * DIMM slots.
++	 */
++	half_pa = (u64)l1tf_pfn_limit() << PAGE_SHIFT;
++	if (e820_any_mapped(half_pa, ULLONG_MAX - half_pa, E820_RAM)) {
++		pr_warn("System has more than MAX_PA/2 memory. L1TF mitigation not effective.\n");
++		return;
++	}
++
++	setup_force_cpu_cap(X86_FEATURE_L1TF_PTEINV);
++}
++#undef pr_fmt
++
+ #ifdef CONFIG_SYSFS
+ 
+ static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr,
+@@ -679,6 +688,11 @@ static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr
+ 	case X86_BUG_SPEC_STORE_BYPASS:
+ 		return sprintf(buf, "%s\n", ssb_strings[ssb_mode]);
+ 
++	case X86_BUG_L1TF:
++		if (boot_cpu_has(X86_FEATURE_L1TF_PTEINV))
++			return sprintf(buf, "Mitigation: Page Table Inversion\n");
++		break;
++
+ 	default:
+ 		break;
+ 	}
+@@ -705,4 +719,9 @@ ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute *
+ {
+ 	return cpu_show_common(dev, attr, buf, X86_BUG_SPEC_STORE_BYPASS);
+ }
++
++ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf)
++{
++	return cpu_show_common(dev, attr, buf, X86_BUG_L1TF);
++}
+ #endif
+diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
+index 3d21b28f9826..4d3fa79c0f09 100644
+--- a/arch/x86/kernel/cpu/common.c
++++ b/arch/x86/kernel/cpu/common.c
+@@ -880,6 +880,21 @@ static const __initconst struct x86_cpu_id cpu_no_spec_store_bypass[] = {
+ 	{}
+ };
+ 
++static const __initconst struct x86_cpu_id cpu_no_l1tf[] = {
++	/* in addition to cpu_no_speculation */
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT1	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT2	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_AIRMONT		},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_MERRIFIELD	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_MOOREFIELD	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_GOLDMONT	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_DENVERTON	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_GEMINI_LAKE	},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNL		},
++	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNM		},
++	{}
++};
++
+ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+ {
+ 	u64 ia32_cap = 0;
+@@ -905,6 +920,11 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+ 		return;
+ 
+ 	setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
++
++	if (x86_match_cpu(cpu_no_l1tf))
++		return;
++
++	setup_force_cpu_bug(X86_BUG_L1TF);
+ }
+ 
+ /*
+diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
+index 1f5c47a49e35..c6f466d6cc57 100644
+--- a/arch/x86/kernel/kprobes/core.c
++++ b/arch/x86/kernel/kprobes/core.c
+@@ -393,7 +393,6 @@ int __copy_instruction(u8 *dest, u8 *src)
+ 		newdisp = (u8 *) src + (s64) insn.displacement.value - (u8 *) dest;
+ 		if ((s64) (s32) newdisp != newdisp) {
+ 			pr_err("Kprobes error: new displacement does not fit into s32 (%llx)\n", newdisp);
+-			pr_err("\tSrc: %p, Dest: %p, old disp: %x\n", src, dest, insn.displacement.value);
+ 			return 0;
+ 		}
+ 		disp = (u8 *) dest + insn_offset_displacement(&insn);
+@@ -609,8 +608,7 @@ static int reenter_kprobe(struct kprobe *p, struct pt_regs *regs,
+ 		 * Raise a BUG or we'll continue in an endless reentering loop
+ 		 * and eventually a stack overflow.
+ 		 */
+-		printk(KERN_WARNING "Unrecoverable kprobe detected at %p.\n",
+-		       p->addr);
++		pr_err("Unrecoverable kprobe detected.\n");
+ 		dump_kprobe(p);
+ 		BUG();
+ 	default:
+diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
+index f534a0e3af53..632195b41688 100644
+--- a/arch/x86/kernel/paravirt.c
++++ b/arch/x86/kernel/paravirt.c
+@@ -97,10 +97,12 @@ unsigned paravirt_patch_call(void *insnbuf,
+ 	struct branch *b = insnbuf;
+ 	unsigned long delta = (unsigned long)target - (addr+5);
+ 
+-	if (tgt_clobbers & ~site_clobbers)
+-		return len;	/* target would clobber too much for this site */
+-	if (len < 5)
++	if (len < 5) {
++#ifdef CONFIG_RETPOLINE
++		WARN_ONCE("Failing to patch indirect CALL in %ps\n", (void *)addr);
++#endif
+ 		return len;	/* call too long for patch site */
++	}
+ 
+ 	b->opcode = 0xe8; /* call */
+ 	b->delta = delta;
+@@ -115,8 +117,12 @@ unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
+ 	struct branch *b = insnbuf;
+ 	unsigned long delta = (unsigned long)target - (addr+5);
+ 
+-	if (len < 5)
++	if (len < 5) {
++#ifdef CONFIG_RETPOLINE
++		WARN_ONCE("Failing to patch indirect JMP in %ps\n", (void *)addr);
++#endif
+ 		return len;	/* call too long for patch site */
++	}
+ 
+ 	b->opcode = 0xe9;	/* jmp */
+ 	b->delta = delta;
+diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
+index bbaae4cf9e8e..31c4bc0d3372 100644
+--- a/arch/x86/kernel/setup.c
++++ b/arch/x86/kernel/setup.c
+@@ -851,6 +851,12 @@ void __init setup_arch(char **cmdline_p)
+ 	memblock_reserve(__pa_symbol(_text),
+ 			 (unsigned long)__bss_stop - (unsigned long)_text);
+ 
++	/*
++	 * Make sure page 0 is always reserved because on systems with
++	 * L1TF its contents can be leaked to user processes.
++	 */
++	memblock_reserve(0, PAGE_SIZE);
++
+ 	early_reserve_initrd();
+ 
+ 	/*
+diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
+index 151fd33e9043..4954a6cef50a 100644
+--- a/arch/x86/mm/init.c
++++ b/arch/x86/mm/init.c
+@@ -4,6 +4,8 @@
+ #include <linux/swap.h>
+ #include <linux/memblock.h>
+ #include <linux/bootmem.h>	/* for max_low_pfn */
++#include <linux/swapfile.h>
++#include <linux/swapops.h>
+ 
+ #include <asm/cacheflush.h>
+ #include <asm/e820.h>
+@@ -767,3 +769,26 @@ void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
+ 	__cachemode2pte_tbl[cache] = __cm_idx2pte(entry);
+ 	__pte2cachemode_tbl[entry] = cache;
+ }
++
++#ifdef CONFIG_SWAP
++unsigned long max_swapfile_size(void)
++{
++	unsigned long pages;
++
++	pages = generic_max_swapfile_size();
++
++	if (boot_cpu_has_bug(X86_BUG_L1TF)) {
++		/* Limit the swap file size to MAX_PA/2 for L1TF workaround */
++		unsigned long l1tf_limit = l1tf_pfn_limit() + 1;
++		/*
++		 * We encode swap offsets also with 3 bits below those for pfn
++		 * which makes the usable limit higher.
++		 */
++#if CONFIG_PGTABLE_LEVELS > 2
++		l1tf_limit <<= PAGE_SHIFT - SWP_OFFSET_FIRST_BIT;
++#endif
++		pages = min_t(unsigned long, l1tf_limit, pages);
++	}
++	return pages;
++}
++#endif
+diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c
+index 76604c8a2a48..7bf14e74fc8f 100644
+--- a/arch/x86/mm/kmmio.c
++++ b/arch/x86/mm/kmmio.c
+@@ -125,24 +125,29 @@ static struct kmmio_fault_page *get_kmmio_fault_page(unsigned long addr)
+ 
+ static void clear_pmd_presence(pmd_t *pmd, bool clear, pmdval_t *old)
+ {
++	pmd_t new_pmd;
+ 	pmdval_t v = pmd_val(*pmd);
+ 	if (clear) {
+-		*old = v & _PAGE_PRESENT;
+-		v &= ~_PAGE_PRESENT;
+-	} else	/* presume this has been called with clear==true previously */
+-		v |= *old;
+-	set_pmd(pmd, __pmd(v));
++		*old = v;
++		new_pmd = pmd_mknotpresent(*pmd);
++	} else {
++		/* Presume this has been called with clear==true previously */
++		new_pmd = __pmd(*old);
++	}
++	set_pmd(pmd, new_pmd);
+ }
+ 
+ static void clear_pte_presence(pte_t *pte, bool clear, pteval_t *old)
+ {
+ 	pteval_t v = pte_val(*pte);
+ 	if (clear) {
+-		*old = v & _PAGE_PRESENT;
+-		v &= ~_PAGE_PRESENT;
+-	} else	/* presume this has been called with clear==true previously */
+-		v |= *old;
+-	set_pte_atomic(pte, __pte(v));
++		*old = v;
++		/* Nothing should care about address */
++		pte_clear(&init_mm, 0, pte);
++	} else {
++		/* Presume this has been called with clear==true previously */
++		set_pte_atomic(pte, __pte(*old));
++	}
+ }
+ 
+ static int clear_page_presence(struct kmmio_fault_page *f, bool clear)
+diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
+index 307f60ecfc6d..9a055ea279eb 100644
+--- a/arch/x86/mm/mmap.c
++++ b/arch/x86/mm/mmap.c
+@@ -121,3 +121,24 @@ const char *arch_vma_name(struct vm_area_struct *vma)
+ 		return "[mpx]";
+ 	return NULL;
+ }
++
++/*
++ * Only allow root to set high MMIO mappings to PROT_NONE.
++ * This prevents an unpriv. user to set them to PROT_NONE and invert
++ * them, then pointing to valid memory for L1TF speculation.
++ *
++ * Note: for locked down kernels may want to disable the root override.
++ */
++bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
++{
++	if (!boot_cpu_has_bug(X86_BUG_L1TF))
++		return true;
++	if (!__pte_needs_invert(pgprot_val(prot)))
++		return true;
++	/* If it's real memory always allow */
++	if (pfn_valid(pfn))
++		return true;
++	if (pfn > l1tf_pfn_limit() && !capable(CAP_SYS_ADMIN))
++		return false;
++	return true;
++}
+diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
+index 79377e2a7bcd..27610c2d1821 100644
+--- a/arch/x86/mm/pageattr.c
++++ b/arch/x86/mm/pageattr.c
+@@ -1006,8 +1006,8 @@ static int populate_pmd(struct cpa_data *cpa,
+ 
+ 		pmd = pmd_offset(pud, start);
+ 
+-		set_pmd(pmd, __pmd(cpa->pfn | _PAGE_PSE |
+-				   massage_pgprot(pmd_pgprot)));
++		set_pmd(pmd, pmd_mkhuge(pfn_pmd(cpa->pfn,
++					canon_pgprot(pmd_pgprot))));
+ 
+ 		start	  += PMD_SIZE;
+ 		cpa->pfn  += PMD_SIZE;
+@@ -1079,8 +1079,8 @@ static int populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
+ 	 * Map everything starting from the Gb boundary, possibly with 1G pages
+ 	 */
+ 	while (end - start >= PUD_SIZE) {
+-		set_pud(pud, __pud(cpa->pfn | _PAGE_PSE |
+-				   massage_pgprot(pud_pgprot)));
++		set_pud(pud, pud_mkhuge(pfn_pud(cpa->pfn,
++				   canon_pgprot(pud_pgprot))));
+ 
+ 		start	  += PUD_SIZE;
+ 		cpa->pfn  += PUD_SIZE;
+diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
+index f9e0d09f7c66..8a0f77fb5181 100644
+--- a/drivers/acpi/acpi_lpss.c
++++ b/drivers/acpi/acpi_lpss.c
+@@ -154,10 +154,12 @@ static const struct lpss_device_desc lpt_sdio_dev_desc = {
+ 
+ static const struct lpss_device_desc byt_pwm_dev_desc = {
+ 	.flags = LPSS_SAVE_CTX,
++	.prv_offset = 0x800,
+ };
+ 
+ static const struct lpss_device_desc bsw_pwm_dev_desc = {
+ 	.flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
++	.prv_offset = 0x800,
+ };
+ 
+ static const struct lpss_device_desc byt_uart_dev_desc = {
+diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
+index 143edea1076f..41090ef5facb 100644
+--- a/drivers/base/cpu.c
++++ b/drivers/base/cpu.c
+@@ -524,16 +524,24 @@ ssize_t __weak cpu_show_spec_store_bypass(struct device *dev,
+ 	return sprintf(buf, "Not affected\n");
+ }
+ 
++ssize_t __weak cpu_show_l1tf(struct device *dev,
++			     struct device_attribute *attr, char *buf)
++{
++	return sprintf(buf, "Not affected\n");
++}
++
+ static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
+ static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL);
+ static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL);
+ static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL);
++static DEVICE_ATTR(l1tf, 0444, cpu_show_l1tf, NULL);
+ 
+ static struct attribute *cpu_root_vulnerabilities_attrs[] = {
+ 	&dev_attr_meltdown.attr,
+ 	&dev_attr_spectre_v1.attr,
+ 	&dev_attr_spectre_v2.attr,
+ 	&dev_attr_spec_store_bypass.attr,
++	&dev_attr_l1tf.attr,
+ 	NULL
+ };
+ 
+diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
+index 912ad30be585..4719aa781bf2 100644
+--- a/drivers/char/tpm/tpm-dev.c
++++ b/drivers/char/tpm/tpm-dev.c
+@@ -25,7 +25,7 @@ struct file_priv {
+ 	struct tpm_chip *chip;
+ 
+ 	/* Data passed to and from the tpm via the read/write calls */
+-	atomic_t data_pending;
++	size_t data_pending;
+ 	struct mutex buffer_mutex;
+ 
+ 	struct timer_list user_read_timer;      /* user needs to claim result */
+@@ -46,7 +46,7 @@ static void timeout_work(struct work_struct *work)
+ 	struct file_priv *priv = container_of(work, struct file_priv, work);
+ 
+ 	mutex_lock(&priv->buffer_mutex);
+-	atomic_set(&priv->data_pending, 0);
++	priv->data_pending = 0;
+ 	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
+ 	mutex_unlock(&priv->buffer_mutex);
+ }
+@@ -72,7 +72,6 @@ static int tpm_open(struct inode *inode, struct file *file)
+ 	}
+ 
+ 	priv->chip = chip;
+-	atomic_set(&priv->data_pending, 0);
+ 	mutex_init(&priv->buffer_mutex);
+ 	setup_timer(&priv->user_read_timer, user_reader_timeout,
+ 			(unsigned long)priv);
+@@ -86,28 +85,24 @@ static ssize_t tpm_read(struct file *file, char __user *buf,
+ 			size_t size, loff_t *off)
+ {
+ 	struct file_priv *priv = file->private_data;
+-	ssize_t ret_size;
++	ssize_t ret_size = 0;
+ 	int rc;
+ 
+ 	del_singleshot_timer_sync(&priv->user_read_timer);
+ 	flush_work(&priv->work);
+-	ret_size = atomic_read(&priv->data_pending);
+-	if (ret_size > 0) {	/* relay data */
+-		ssize_t orig_ret_size = ret_size;
+-		if (size < ret_size)
+-			ret_size = size;
++	mutex_lock(&priv->buffer_mutex);
+ 
+-		mutex_lock(&priv->buffer_mutex);
++	if (priv->data_pending) {
++		ret_size = min_t(ssize_t, size, priv->data_pending);
+ 		rc = copy_to_user(buf, priv->data_buffer, ret_size);
+-		memset(priv->data_buffer, 0, orig_ret_size);
++		memset(priv->data_buffer, 0, priv->data_pending);
+ 		if (rc)
+ 			ret_size = -EFAULT;
+ 
+-		mutex_unlock(&priv->buffer_mutex);
++		priv->data_pending = 0;
+ 	}
+ 
+-	atomic_set(&priv->data_pending, 0);
+-
++	mutex_unlock(&priv->buffer_mutex);
+ 	return ret_size;
+ }
+ 
+@@ -118,18 +113,20 @@ static ssize_t tpm_write(struct file *file, const char __user *buf,
+ 	size_t in_size = size;
+ 	ssize_t out_size;
+ 
+-	/* cannot perform a write until the read has cleared
+-	   either via tpm_read or a user_read_timer timeout.
+-	   This also prevents splitted buffered writes from blocking here.
+-	*/
+-	if (atomic_read(&priv->data_pending) != 0)
+-		return -EBUSY;
+-
+ 	if (in_size > TPM_BUFSIZE)
+ 		return -E2BIG;
+ 
+ 	mutex_lock(&priv->buffer_mutex);
+ 
++	/* Cannot perform a write until the read has cleared either via
++	 * tpm_read or a user_read_timer timeout. This also prevents split
++	 * buffered writes from blocking here.
++	 */
++	if (priv->data_pending != 0) {
++		mutex_unlock(&priv->buffer_mutex);
++		return -EBUSY;
++	}
++
+ 	if (copy_from_user
+ 	    (priv->data_buffer, (void __user *) buf, in_size)) {
+ 		mutex_unlock(&priv->buffer_mutex);
+@@ -153,7 +150,7 @@ static ssize_t tpm_write(struct file *file, const char __user *buf,
+ 		return out_size;
+ 	}
+ 
+-	atomic_set(&priv->data_pending, out_size);
++	priv->data_pending = out_size;
+ 	mutex_unlock(&priv->buffer_mutex);
+ 
+ 	/* Set a timeout by which the reader must come claim the result */
+@@ -172,7 +169,7 @@ static int tpm_release(struct inode *inode, struct file *file)
+ 	del_singleshot_timer_sync(&priv->user_read_timer);
+ 	flush_work(&priv->work);
+ 	file->private_data = NULL;
+-	atomic_set(&priv->data_pending, 0);
++	priv->data_pending = 0;
+ 	clear_bit(0, &priv->chip->is_open);
+ 	kfree(priv);
+ 	return 0;
+diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
+index 6790ebb366dd..98fd9a594841 100644
+--- a/drivers/infiniband/core/umem.c
++++ b/drivers/infiniband/core/umem.c
+@@ -122,16 +122,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
+ 	umem->address   = addr;
+ 	umem->page_size = PAGE_SIZE;
+ 	umem->pid       = get_task_pid(current, PIDTYPE_PID);
+-	/*
+-	 * We ask for writable memory if any of the following
+-	 * access flags are set.  "Local write" and "remote write"
+-	 * obviously require write access.  "Remote atomic" can do
+-	 * things like fetch and add, which will modify memory, and
+-	 * "MW bind" can change permissions by binding a window.
+-	 */
+-	umem->writable  = !!(access &
+-		(IB_ACCESS_LOCAL_WRITE   | IB_ACCESS_REMOTE_WRITE |
+-		 IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND));
++	umem->writable   = ib_access_writable(access);
+ 
+ 	if (access & IB_ACCESS_ON_DEMAND) {
+ 		put_pid(umem->pid);
+diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
+index ce87e9cc7eff..bf52e35dd506 100644
+--- a/drivers/infiniband/hw/mlx4/mr.c
++++ b/drivers/infiniband/hw/mlx4/mr.c
+@@ -130,6 +130,40 @@ out:
+ 	return err;
+ }
+ 
++static struct ib_umem *mlx4_get_umem_mr(struct ib_ucontext *context, u64 start,
++					u64 length, u64 virt_addr,
++					int access_flags)
++{
++	/*
++	 * Force registering the memory as writable if the underlying pages
++	 * are writable.  This is so rereg can change the access permissions
++	 * from readable to writable without having to run through ib_umem_get
++	 * again
++	 */
++	if (!ib_access_writable(access_flags)) {
++		struct vm_area_struct *vma;
++
++		down_read(&current->mm->mmap_sem);
++		/*
++		 * FIXME: Ideally this would iterate over all the vmas that
++		 * cover the memory, but for now it requires a single vma to
++		 * entirely cover the MR to support RO mappings.
++		 */
++		vma = find_vma(current->mm, start);
++		if (vma && vma->vm_end >= start + length &&
++		    vma->vm_start <= start) {
++			if (vma->vm_flags & VM_WRITE)
++				access_flags |= IB_ACCESS_LOCAL_WRITE;
++		} else {
++			access_flags |= IB_ACCESS_LOCAL_WRITE;
++		}
++
++		up_read(&current->mm->mmap_sem);
++	}
++
++	return ib_umem_get(context, start, length, access_flags, 0);
++}
++
+ struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
+ 				  u64 virt_addr, int access_flags,
+ 				  struct ib_udata *udata)
+@@ -144,10 +178,8 @@ struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
+ 	if (!mr)
+ 		return ERR_PTR(-ENOMEM);
+ 
+-	/* Force registering the memory as writable. */
+-	/* Used for memory re-registeration. HCA protects the access */
+-	mr->umem = ib_umem_get(pd->uobject->context, start, length,
+-			       access_flags | IB_ACCESS_LOCAL_WRITE, 0);
++	mr->umem = mlx4_get_umem_mr(pd->uobject->context, start, length,
++				    virt_addr, access_flags);
+ 	if (IS_ERR(mr->umem)) {
+ 		err = PTR_ERR(mr->umem);
+ 		goto err_free;
+@@ -214,6 +246,9 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
+ 	}
+ 
+ 	if (flags & IB_MR_REREG_ACCESS) {
++		if (ib_access_writable(mr_access_flags) && !mmr->umem->writable)
++			return -EPERM;
++
+ 		err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry,
+ 					       convert_access(mr_access_flags));
+ 
+@@ -227,10 +262,9 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
+ 
+ 		mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
+ 		ib_umem_release(mmr->umem);
+-		mmr->umem = ib_umem_get(mr->uobject->context, start, length,
+-					mr_access_flags |
+-					IB_ACCESS_LOCAL_WRITE,
+-					0);
++		mmr->umem =
++			mlx4_get_umem_mr(mr->uobject->context, start, length,
++					 virt_addr, mr_access_flags);
+ 		if (IS_ERR(mmr->umem)) {
+ 			err = PTR_ERR(mmr->umem);
+ 			/* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */
+diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_stats.c b/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
+index 748b63b86cbc..40242ead096f 100644
+--- a/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
++++ b/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
+@@ -643,7 +643,7 @@ static ssize_t ocrdma_dbgfs_ops_write(struct file *filp,
+ 	struct ocrdma_stats *pstats = filp->private_data;
+ 	struct ocrdma_dev *dev = pstats->dev;
+ 
+-	if (count > 32)
++	if (*ppos != 0 || count == 0 || count > sizeof(tmp_str))
+ 		goto err;
+ 
+ 	if (copy_from_user(tmp_str, buffer, count))
+diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
+index bec9f099573b..68d0a5c9d437 100644
+--- a/drivers/net/xen-netfront.c
++++ b/drivers/net/xen-netfront.c
+@@ -879,7 +879,6 @@ static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
+ 				  struct sk_buff *skb,
+ 				  struct sk_buff_head *list)
+ {
+-	struct skb_shared_info *shinfo = skb_shinfo(skb);
+ 	RING_IDX cons = queue->rx.rsp_cons;
+ 	struct sk_buff *nskb;
+ 
+@@ -888,15 +887,16 @@ static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
+ 			RING_GET_RESPONSE(&queue->rx, ++cons);
+ 		skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
+ 
+-		if (shinfo->nr_frags == MAX_SKB_FRAGS) {
++		if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) {
+ 			unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
+ 
+ 			BUG_ON(pull_to <= skb_headlen(skb));
+ 			__pskb_pull_tail(skb, pull_to - skb_headlen(skb));
+ 		}
+-		BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
++		BUG_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS);
+ 
+-		skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
++		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
++				skb_frag_page(nfrag),
+ 				rx->offset, rx->status, PAGE_SIZE);
+ 
+ 		skb_shinfo(nskb)->nr_frags = 0;
+diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
+index de53c9694b68..5dc288fecace 100644
+--- a/drivers/scsi/sr.c
++++ b/drivers/scsi/sr.c
+@@ -520,18 +520,26 @@ static int sr_init_command(struct scsi_cmnd *SCpnt)
+ static int sr_block_open(struct block_device *bdev, fmode_t mode)
+ {
+ 	struct scsi_cd *cd;
++	struct scsi_device *sdev;
+ 	int ret = -ENXIO;
+ 
++	cd = scsi_cd_get(bdev->bd_disk);
++	if (!cd)
++		goto out;
++
++	sdev = cd->device;
++	scsi_autopm_get_device(sdev);
+ 	check_disk_change(bdev);
+ 
+ 	mutex_lock(&sr_mutex);
+-	cd = scsi_cd_get(bdev->bd_disk);
+-	if (cd) {
+-		ret = cdrom_open(&cd->cdi, bdev, mode);
+-		if (ret)
+-			scsi_cd_put(cd);
+-	}
++	ret = cdrom_open(&cd->cdi, bdev, mode);
+ 	mutex_unlock(&sr_mutex);
++
++	scsi_autopm_put_device(sdev);
++	if (ret)
++		scsi_cd_put(cd);
++
++out:
+ 	return ret;
+ }
+ 
+@@ -559,6 +567,8 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
+ 	if (ret)
+ 		goto out;
+ 
++	scsi_autopm_get_device(sdev);
++
+ 	/*
+ 	 * Send SCSI addressing ioctls directly to mid level, send other
+ 	 * ioctls to cdrom/block level.
+@@ -567,15 +577,18 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
+ 	case SCSI_IOCTL_GET_IDLUN:
+ 	case SCSI_IOCTL_GET_BUS_NUMBER:
+ 		ret = scsi_ioctl(sdev, cmd, argp);
+-		goto out;
++		goto put;
+ 	}
+ 
+ 	ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
+ 	if (ret != -ENOSYS)
+-		goto out;
++		goto put;
+ 
+ 	ret = scsi_ioctl(sdev, cmd, argp);
+ 
++put:
++	scsi_autopm_put_device(sdev);
++
+ out:
+ 	mutex_unlock(&sr_mutex);
+ 	return ret;
+diff --git a/fs/dcache.c b/fs/dcache.c
+index 250c1222e30c..807efaab838e 100644
+--- a/fs/dcache.c
++++ b/fs/dcache.c
+@@ -1954,10 +1954,12 @@ struct dentry *d_make_root(struct inode *root_inode)
+ 		static const struct qstr name = QSTR_INIT("/", 1);
+ 
+ 		res = __d_alloc(root_inode->i_sb, &name);
+-		if (res)
++		if (res) {
++			res->d_flags |= DCACHE_RCUACCESS;
+ 			d_instantiate(res, root_inode);
+-		else
++		} else {
+ 			iput(root_inode);
++		}
+ 	}
+ 	return res;
+ }
+diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
+index 041117fd8fd7..0963213e9cd3 100644
+--- a/fs/ext4/ialloc.c
++++ b/fs/ext4/ialloc.c
+@@ -1308,7 +1308,10 @@ int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
+ 			    ext4_itable_unused_count(sb, gdp)),
+ 			    sbi->s_inodes_per_block);
+ 
+-	if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) {
++	if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group) ||
++	    ((group == 0) && ((EXT4_INODES_PER_GROUP(sb) -
++			       ext4_itable_unused_count(sb, gdp)) <
++			      EXT4_FIRST_INO(sb)))) {
+ 		ext4_error(sb, "Something is wrong with group %u: "
+ 			   "used itable blocks: %d; "
+ 			   "itable unused count: %u",
+diff --git a/fs/ext4/super.c b/fs/ext4/super.c
+index 3e4d8ac1974e..8d18f6142da5 100644
+--- a/fs/ext4/super.c
++++ b/fs/ext4/super.c
+@@ -2875,14 +2875,8 @@ static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
+ 		if (!gdp)
+ 			continue;
+ 
+-		if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
+-			continue;
+-		if (group != 0)
++		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
+ 			break;
+-		ext4_error(sb, "Inode table for bg 0 marked as "
+-			   "needing zeroing");
+-		if (sb->s_flags & MS_RDONLY)
+-			return ngroups;
+ 	}
+ 
+ 	return group;
+diff --git a/fs/namespace.c b/fs/namespace.c
+index a879560ea144..b56b50e3da11 100644
+--- a/fs/namespace.c
++++ b/fs/namespace.c
+@@ -603,12 +603,21 @@ int __legitimize_mnt(struct vfsmount *bastard, unsigned seq)
+ 		return 0;
+ 	mnt = real_mount(bastard);
+ 	mnt_add_count(mnt, 1);
++	smp_mb();			// see mntput_no_expire()
+ 	if (likely(!read_seqretry(&mount_lock, seq)))
+ 		return 0;
+ 	if (bastard->mnt_flags & MNT_SYNC_UMOUNT) {
+ 		mnt_add_count(mnt, -1);
+ 		return 1;
+ 	}
++	lock_mount_hash();
++	if (unlikely(bastard->mnt_flags & MNT_DOOMED)) {
++		mnt_add_count(mnt, -1);
++		unlock_mount_hash();
++		return 1;
++	}
++	unlock_mount_hash();
++	/* caller will mntput() */
+ 	return -1;
+ }
+ 
+@@ -1124,12 +1133,27 @@ static DECLARE_DELAYED_WORK(delayed_mntput_work, delayed_mntput);
+ static void mntput_no_expire(struct mount *mnt)
+ {
+ 	rcu_read_lock();
+-	mnt_add_count(mnt, -1);
+-	if (likely(mnt->mnt_ns)) { /* shouldn't be the last one */
++	if (likely(READ_ONCE(mnt->mnt_ns))) {
++		/*
++		 * Since we don't do lock_mount_hash() here,
++		 * ->mnt_ns can change under us.  However, if it's
++		 * non-NULL, then there's a reference that won't
++		 * be dropped until after an RCU delay done after
++		 * turning ->mnt_ns NULL.  So if we observe it
++		 * non-NULL under rcu_read_lock(), the reference
++		 * we are dropping is not the final one.
++		 */
++		mnt_add_count(mnt, -1);
+ 		rcu_read_unlock();
+ 		return;
+ 	}
+ 	lock_mount_hash();
++	/*
++	 * make sure that if __legitimize_mnt() has not seen us grab
++	 * mount_lock, we'll see their refcount increment here.
++	 */
++	smp_mb();
++	mnt_add_count(mnt, -1);
+ 	if (mnt_get_count(mnt)) {
+ 		rcu_read_unlock();
+ 		unlock_mount_hash();
+diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
+index 25b793325b09..dabecb661264 100644
+--- a/include/asm-generic/pgtable.h
++++ b/include/asm-generic/pgtable.h
+@@ -799,6 +799,18 @@ static inline int pmd_free_pte_page(pmd_t *pmd)
+ }
+ #endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
+ 
++#ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED
++static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
++{
++	return true;
++}
++
++static inline bool arch_has_pfn_modify_check(void)
++{
++	return false;
++}
++#endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */
++
+ #endif /* !__ASSEMBLY__ */
+ 
+ #ifndef io_remap_pfn_range
+diff --git a/include/linux/cpu.h b/include/linux/cpu.h
+index 2f9d12022100..063c73ed6d78 100644
+--- a/include/linux/cpu.h
++++ b/include/linux/cpu.h
+@@ -48,6 +48,8 @@ extern ssize_t cpu_show_spectre_v2(struct device *dev,
+ 				   struct device_attribute *attr, char *buf);
+ extern ssize_t cpu_show_spec_store_bypass(struct device *dev,
+ 					  struct device_attribute *attr, char *buf);
++extern ssize_t cpu_show_l1tf(struct device *dev,
++			     struct device_attribute *attr, char *buf);
+ 
+ extern __printf(4, 5)
+ struct device *cpu_device_create(struct device *parent, void *drvdata,
+diff --git a/include/linux/mm.h b/include/linux/mm.h
+index a100946607a5..1f4366567e7d 100644
+--- a/include/linux/mm.h
++++ b/include/linux/mm.h
+@@ -2083,6 +2083,8 @@ int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
+ int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
+ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
+ 			unsigned long pfn);
++int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
++			unsigned long pfn, pgprot_t pgprot);
+ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
+ 			unsigned long pfn);
+ int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
+diff --git a/include/linux/swapfile.h b/include/linux/swapfile.h
+index 388293a91e8c..e4594de79bc4 100644
+--- a/include/linux/swapfile.h
++++ b/include/linux/swapfile.h
+@@ -9,5 +9,7 @@ extern spinlock_t swap_lock;
+ extern struct plist_head swap_active_head;
+ extern struct swap_info_struct *swap_info[];
+ extern int try_to_unuse(unsigned int, bool, unsigned long);
++extern unsigned long generic_max_swapfile_size(void);
++extern unsigned long max_swapfile_size(void);
+ 
+ #endif /* _LINUX_SWAPFILE_H */
+diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
+index ff307b548ed3..646891f3bc1e 100644
+--- a/include/linux/thread_info.h
++++ b/include/linux/thread_info.h
+@@ -55,11 +55,7 @@ extern long do_no_restart_syscall(struct restart_block *parm);
+ 
+ #ifdef __KERNEL__
+ 
+-#ifdef CONFIG_DEBUG_STACK_USAGE
+-# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
+-#else
+-# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK)
+-#endif
++#define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
+ 
+ /*
+  * flag set/clear/test wrappers
+diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
+index 120da1d7f57e..10fefb0dc640 100644
+--- a/include/rdma/ib_verbs.h
++++ b/include/rdma/ib_verbs.h
+@@ -3007,6 +3007,20 @@ static inline int ib_check_mr_access(int flags)
+ 	return 0;
+ }
+ 
++static inline bool ib_access_writable(int access_flags)
++{
++	/*
++	 * We have writable memory backing the MR if any of the following
++	 * access flags are set.  "Local write" and "remote write" obviously
++	 * require write access.  "Remote atomic" can do things like fetch and
++	 * add, which will modify memory, and "MW bind" can change permissions
++	 * by binding a window.
++	 */
++	return access_flags &
++		(IB_ACCESS_LOCAL_WRITE   | IB_ACCESS_REMOTE_WRITE |
++		 IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND);
++}
++
+ /**
+  * ib_check_mr_status: lightweight check of MR status.
+  *     This routine may provide status checks on a selected
+diff --git a/mm/memory.c b/mm/memory.c
+index 177cb7d111a9..d5bb1465d30c 100644
+--- a/mm/memory.c
++++ b/mm/memory.c
+@@ -1604,9 +1604,30 @@ out:
+  */
+ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
+ 			unsigned long pfn)
++{
++	return vm_insert_pfn_prot(vma, addr, pfn, vma->vm_page_prot);
++}
++EXPORT_SYMBOL(vm_insert_pfn);
++
++/**
++ * vm_insert_pfn_prot - insert single pfn into user vma with specified pgprot
++ * @vma: user vma to map to
++ * @addr: target user address of this page
++ * @pfn: source kernel pfn
++ * @pgprot: pgprot flags for the inserted page
++ *
++ * This is exactly like vm_insert_pfn, except that it allows drivers to
++ * to override pgprot on a per-page basis.
++ *
++ * This only makes sense for IO mappings, and it makes no sense for
++ * cow mappings.  In general, using multiple vmas is preferable;
++ * vm_insert_pfn_prot should only be used if using multiple VMAs is
++ * impractical.
++ */
++int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
++			unsigned long pfn, pgprot_t pgprot)
+ {
+ 	int ret;
+-	pgprot_t pgprot = vma->vm_page_prot;
+ 	/*
+ 	 * Technically, architectures with pte_special can avoid all these
+ 	 * restrictions (same for remap_pfn_range).  However we would like
+@@ -1624,19 +1645,29 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
+ 	if (track_pfn_insert(vma, &pgprot, pfn))
+ 		return -EINVAL;
+ 
++	if (!pfn_modify_allowed(pfn, pgprot))
++		return -EACCES;
++
+ 	ret = insert_pfn(vma, addr, pfn, pgprot);
+ 
+ 	return ret;
+ }
+-EXPORT_SYMBOL(vm_insert_pfn);
++EXPORT_SYMBOL(vm_insert_pfn_prot);
+ 
+ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
+ 			unsigned long pfn)
+ {
++	pgprot_t pgprot = vma->vm_page_prot;
++
+ 	BUG_ON(!(vma->vm_flags & VM_MIXEDMAP));
+ 
+ 	if (addr < vma->vm_start || addr >= vma->vm_end)
+ 		return -EFAULT;
++	if (track_pfn_insert(vma, &pgprot, pfn))
++		return -EINVAL;
++
++	if (!pfn_modify_allowed(pfn, pgprot))
++		return -EACCES;
+ 
+ 	/*
+ 	 * If we don't have pte special, then we have to use the pfn_valid()
+@@ -1649,9 +1680,9 @@ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
+ 		struct page *page;
+ 
+ 		page = pfn_to_page(pfn);
+-		return insert_page(vma, addr, page, vma->vm_page_prot);
++		return insert_page(vma, addr, page, pgprot);
+ 	}
+-	return insert_pfn(vma, addr, pfn, vma->vm_page_prot);
++	return insert_pfn(vma, addr, pfn, pgprot);
+ }
+ EXPORT_SYMBOL(vm_insert_mixed);
+ 
+@@ -1666,6 +1697,7 @@ static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
+ {
+ 	pte_t *pte;
+ 	spinlock_t *ptl;
++	int err = 0;
+ 
+ 	pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
+ 	if (!pte)
+@@ -1673,12 +1705,16 @@ static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
+ 	arch_enter_lazy_mmu_mode();
+ 	do {
+ 		BUG_ON(!pte_none(*pte));
++		if (!pfn_modify_allowed(pfn, prot)) {
++			err = -EACCES;
++			break;
++		}
+ 		set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot)));
+ 		pfn++;
+ 	} while (pte++, addr += PAGE_SIZE, addr != end);
+ 	arch_leave_lazy_mmu_mode();
+ 	pte_unmap_unlock(pte - 1, ptl);
+-	return 0;
++	return err;
+ }
+ 
+ static inline int remap_pmd_range(struct mm_struct *mm, pud_t *pud,
+@@ -1687,6 +1723,7 @@ static inline int remap_pmd_range(struct mm_struct *mm, pud_t *pud,
+ {
+ 	pmd_t *pmd;
+ 	unsigned long next;
++	int err;
+ 
+ 	pfn -= addr >> PAGE_SHIFT;
+ 	pmd = pmd_alloc(mm, pud, addr);
+@@ -1695,9 +1732,10 @@ static inline int remap_pmd_range(struct mm_struct *mm, pud_t *pud,
+ 	VM_BUG_ON(pmd_trans_huge(*pmd));
+ 	do {
+ 		next = pmd_addr_end(addr, end);
+-		if (remap_pte_range(mm, pmd, addr, next,
+-				pfn + (addr >> PAGE_SHIFT), prot))
+-			return -ENOMEM;
++		err = remap_pte_range(mm, pmd, addr, next,
++				pfn + (addr >> PAGE_SHIFT), prot);
++		if (err)
++			return err;
+ 	} while (pmd++, addr = next, addr != end);
+ 	return 0;
+ }
+@@ -1708,6 +1746,7 @@ static inline int remap_pud_range(struct mm_struct *mm, pgd_t *pgd,
+ {
+ 	pud_t *pud;
+ 	unsigned long next;
++	int err;
+ 
+ 	pfn -= addr >> PAGE_SHIFT;
+ 	pud = pud_alloc(mm, pgd, addr);
+@@ -1715,9 +1754,10 @@ static inline int remap_pud_range(struct mm_struct *mm, pgd_t *pgd,
+ 		return -ENOMEM;
+ 	do {
+ 		next = pud_addr_end(addr, end);
+-		if (remap_pmd_range(mm, pud, addr, next,
+-				pfn + (addr >> PAGE_SHIFT), prot))
+-			return -ENOMEM;
++		err = remap_pmd_range(mm, pud, addr, next,
++				pfn + (addr >> PAGE_SHIFT), prot);
++		if (err)
++			return err;
+ 	} while (pud++, addr = next, addr != end);
+ 	return 0;
+ }
+diff --git a/mm/mprotect.c b/mm/mprotect.c
+index c0b4b2a49462..a277f3412a5d 100644
+--- a/mm/mprotect.c
++++ b/mm/mprotect.c
+@@ -255,6 +255,42 @@ unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
+ 	return pages;
+ }
+ 
++static int prot_none_pte_entry(pte_t *pte, unsigned long addr,
++			       unsigned long next, struct mm_walk *walk)
++{
++	return pfn_modify_allowed(pte_pfn(*pte), *(pgprot_t *)(walk->private)) ?
++		0 : -EACCES;
++}
++
++static int prot_none_hugetlb_entry(pte_t *pte, unsigned long hmask,
++				   unsigned long addr, unsigned long next,
++				   struct mm_walk *walk)
++{
++	return pfn_modify_allowed(pte_pfn(*pte), *(pgprot_t *)(walk->private)) ?
++		0 : -EACCES;
++}
++
++static int prot_none_test(unsigned long addr, unsigned long next,
++			  struct mm_walk *walk)
++{
++	return 0;
++}
++
++static int prot_none_walk(struct vm_area_struct *vma, unsigned long start,
++			   unsigned long end, unsigned long newflags)
++{
++	pgprot_t new_pgprot = vm_get_page_prot(newflags);
++	struct mm_walk prot_none_walk = {
++		.pte_entry = prot_none_pte_entry,
++		.hugetlb_entry = prot_none_hugetlb_entry,
++		.test_walk = prot_none_test,
++		.mm = current->mm,
++		.private = &new_pgprot,
++	};
++
++	return walk_page_range(start, end, &prot_none_walk);
++}
++
+ int
+ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
+ 	unsigned long start, unsigned long end, unsigned long newflags)
+@@ -272,6 +308,19 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
+ 		return 0;
+ 	}
+ 
++	/*
++	 * Do PROT_NONE PFN permission checks here when we can still
++	 * bail out without undoing a lot of state. This is a rather
++	 * uncommon case, so doesn't need to be very optimized.
++	 */
++	if (arch_has_pfn_modify_check() &&
++	    (vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) &&
++	    (newflags & (VM_READ|VM_WRITE|VM_EXEC)) == 0) {
++		error = prot_none_walk(vma, start, end, newflags);
++		if (error)
++			return error;
++	}
++
+ 	/*
+ 	 * If we make a private mapping writable we increase our commit;
+ 	 * but (without finer accounting) cannot reduce our commit if we
+diff --git a/mm/swapfile.c b/mm/swapfile.c
+index 674bf177ce44..8e25ff2b693a 100644
+--- a/mm/swapfile.c
++++ b/mm/swapfile.c
+@@ -2206,6 +2206,35 @@ static int claim_swapfile(struct swap_info_struct *p, struct inode *inode)
+ 	return 0;
+ }
+ 
++
++/*
++ * Find out how many pages are allowed for a single swap device. There
++ * are two limiting factors:
++ * 1) the number of bits for the swap offset in the swp_entry_t type, and
++ * 2) the number of bits in the swap pte, as defined by the different
++ * architectures.
++ *
++ * In order to find the largest possible bit mask, a swap entry with
++ * swap type 0 and swap offset ~0UL is created, encoded to a swap pte,
++ * decoded to a swp_entry_t again, and finally the swap offset is
++ * extracted.
++ *
++ * This will mask all the bits from the initial ~0UL mask that can't
++ * be encoded in either the swp_entry_t or the architecture definition
++ * of a swap pte.
++ */
++unsigned long generic_max_swapfile_size(void)
++{
++	return swp_offset(pte_to_swp_entry(
++			swp_entry_to_pte(swp_entry(0, ~0UL)))) + 1;
++}
++
++/* Can be overridden by an architecture for additional checks. */
++__weak unsigned long max_swapfile_size(void)
++{
++	return generic_max_swapfile_size();
++}
++
+ static unsigned long read_swap_header(struct swap_info_struct *p,
+ 					union swap_header *swap_header,
+ 					struct inode *inode)
+@@ -2241,22 +2270,7 @@ static unsigned long read_swap_header(struct swap_info_struct *p,
+ 	p->cluster_next = 1;
+ 	p->cluster_nr = 0;
+ 
+-	/*
+-	 * Find out how many pages are allowed for a single swap
+-	 * device. There are two limiting factors: 1) the number
+-	 * of bits for the swap offset in the swp_entry_t type, and
+-	 * 2) the number of bits in the swap pte as defined by the
+-	 * different architectures. In order to find the
+-	 * largest possible bit mask, a swap entry with swap type 0
+-	 * and swap offset ~0UL is created, encoded to a swap pte,
+-	 * decoded to a swp_entry_t again, and finally the swap
+-	 * offset is extracted. This will mask all the bits from
+-	 * the initial ~0UL mask that can't be encoded in either
+-	 * the swp_entry_t or the architecture definition of a
+-	 * swap pte.
+-	 */
+-	maxpages = swp_offset(pte_to_swp_entry(
+-			swp_entry_to_pte(swp_entry(0, ~0UL)))) + 1;
++	maxpages = max_swapfile_size();
+ 	last_page = swap_header->info.last_page;
+ 	if (!last_page) {
+ 		pr_warn("Empty swap-file\n");
+diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
+index 93581bba8643..09d6c4a6b53d 100644
+--- a/net/ipv4/Kconfig
++++ b/net/ipv4/Kconfig
+@@ -354,6 +354,7 @@ config INET_ESP
+ 	select CRYPTO_CBC
+ 	select CRYPTO_SHA1
+ 	select CRYPTO_DES
++	select CRYPTO_ECHAINIV
+ 	---help---
+ 	  Support for IPsec ESP.
+ 
+diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
+index 851d5c9e3ecc..0f50248bad17 100644
+--- a/net/ipv6/Kconfig
++++ b/net/ipv6/Kconfig
+@@ -69,6 +69,7 @@ config INET6_ESP
+ 	select CRYPTO_CBC
+ 	select CRYPTO_SHA1
+ 	select CRYPTO_DES
++	select CRYPTO_ECHAINIV
+ 	---help---
+ 	  Support for IPsec ESP.
+