Merge remote-tracking branch 'origin/kvm-arm64/psci-relay' into kvmarm-master/next

Signed-off-by: Marc Zyngier <maz@kernel.org>

65 files changed, 1711 insertions, 823 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 526d65d8573a..ee9f13776388 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2259,6 +2259,16 @@
 			for all guests.
 			Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
 
+	kvm-arm.mode=
+			[KVM,ARM] Select one of KVM/arm64's modes of operation.
+
+			protected: nVHE-based mode with support for guests whose
+				   state is kept private from the host.
+				   Not valid if the kernel is running in EL2.
+
+			Defaults to VHE/nVHE based on hardware support and
+			the value of CONFIG_ARM64_VHE.
+
 	kvm-arm.vgic_v3_group0_trap=
 			[KVM,ARM] Trap guest accesses to GICv3 group-0
 			system registers
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1515f6f153a0..8d13b9135634 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -195,7 +195,6 @@ config ARM64
 	select PCI_SYSCALL if PCI
 	select POWER_RESET
 	select POWER_SUPPLY
-	select SET_FS
 	select SPARSE_IRQ
 	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
@@ -1388,6 +1387,9 @@ config ARM64_PAN
 	 The feature is detected at runtime, and will remain as a 'nop'
 	 instruction if the cpu does not implement the feature.
 
+config AS_HAS_LDAPR
+	def_bool $(as-instr,.arch_extension rcpc)
+
 config ARM64_LSE_ATOMICS
 	bool
 	default ARM64_USE_LSE_ATOMICS
@@ -1425,27 +1427,6 @@ endmenu
 
 menu "ARMv8.2 architectural features"
 
-config ARM64_UAO
-	bool "Enable support for User Access Override (UAO)"
-	default y
-	help
-	  User Access Override (UAO; part of the ARMv8.2 Extensions)
-	  causes the 'unprivileged' variant of the load/store instructions to
-	  be overridden to be privileged.
-
-	  This option changes get_user() and friends to use the 'unprivileged'
-	  variant of the load/store instructions. This ensures that user-space
-	  really did have access to the supplied memory. When addr_limit is
-	  set to kernel memory the UAO bit will be set, allowing privileged
-	  access to kernel memory.
-
-	  Choosing this option will cause copy_to_user() et al to use user-space
-	  memory permissions.
-
-	  The feature is detected at runtime, the kernel will use the
-	  regular load/store instructions if the cpu does not implement the
-	  feature.
-
 config ARM64_PMEM
 	bool "Enable support for persistent memory"
 	select ARCH_HAS_PMEM_API
diff --git a/arch/arm64/include/asm/alternative-macros.h b/arch/arm64/include/asm/alternative-macros.h
new file mode 100644
index 000000000000..5df500dcc627
--- /dev/null
+++ b/arch/arm64/include/asm/alternative-macros.h
@@ -0,0 +1,217 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ALTERNATIVE_MACROS_H
+#define __ASM_ALTERNATIVE_MACROS_H
+
+#include <asm/cpucaps.h>
+
+#define ARM64_CB_PATCH ARM64_NCAPS
+
+/* A64 instructions are always 32 bits. */
+#define	AARCH64_INSN_SIZE		4
+
+#ifndef __ASSEMBLY__
+
+#include <linux/stringify.h>
+
+#define ALTINSTR_ENTRY(feature)					              \
+	" .word 661b - .\n"				/* label           */ \
+	" .word 663f - .\n"				/* new instruction */ \
+	" .hword " __stringify(feature) "\n"		/* feature bit     */ \
+	" .byte 662b-661b\n"				/* source len      */ \
+	" .byte 664f-663f\n"				/* replacement len */
+
+#define ALTINSTR_ENTRY_CB(feature, cb)					      \
+	" .word 661b - .\n"				/* label           */ \
+	" .word " __stringify(cb) "- .\n"		/* callback */	      \
+	" .hword " __stringify(feature) "\n"		/* feature bit     */ \
+	" .byte 662b-661b\n"				/* source len      */ \
+	" .byte 664f-663f\n"				/* replacement len */
+
+/*
+ * alternative assembly primitive:
+ *
+ * If any of these .org directive fail, it means that insn1 and insn2
+ * don't have the same length. This used to be written as
+ *
+ * .if ((664b-663b) != (662b-661b))
+ * 	.error "Alternatives instruction length mismatch"
+ * .endif
+ *
+ * but most assemblers die if insn1 or insn2 have a .inst. This should
+ * be fixed in a binutils release posterior to 2.25.51.0.2 (anything
+ * containing commit 4e4d08cf7399b606 or c1baaddf8861).
+ *
+ * Alternatives with callbacks do not generate replacement instructions.
+ */
+#define __ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg_enabled)	\
+	".if "__stringify(cfg_enabled)" == 1\n"				\
+	"661:\n\t"							\
+	oldinstr "\n"							\
+	"662:\n"							\
+	".pushsection .altinstructions,\"a\"\n"				\
+	ALTINSTR_ENTRY(feature)						\
+	".popsection\n"							\
+	".subsection 1\n"						\
+	"663:\n\t"							\
+	newinstr "\n"							\
+	"664:\n\t"							\
+	".org	. - (664b-663b) + (662b-661b)\n\t"			\
+	".org	. - (662b-661b) + (664b-663b)\n\t"			\
+	".previous\n"							\
+	".endif\n"
+
+#define __ALTERNATIVE_CFG_CB(oldinstr, feature, cfg_enabled, cb)	\
+	".if "__stringify(cfg_enabled)" == 1\n"				\
+	"661:\n\t"							\
+	oldinstr "\n"							\
+	"662:\n"							\
+	".pushsection .altinstructions,\"a\"\n"				\
+	ALTINSTR_ENTRY_CB(feature, cb)					\
+	".popsection\n"							\
+	"663:\n\t"							\
+	"664:\n\t"							\
+	".endif\n"
+
+#define _ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg, ...)	\
+	__ALTERNATIVE_CFG(oldinstr, newinstr, feature, IS_ENABLED(cfg))
+
+#define ALTERNATIVE_CB(oldinstr, cb) \
+	__ALTERNATIVE_CFG_CB(oldinstr, ARM64_CB_PATCH, 1, cb)
+#else
+
+#include <asm/assembler.h>
+
+.macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len
+	.word \orig_offset - .
+	.word \alt_offset - .
+	.hword \feature
+	.byte \orig_len
+	.byte \alt_len
+.endm
+
+.macro alternative_insn insn1, insn2, cap, enable = 1
+	.if \enable
+661:	\insn1
+662:	.pushsection .altinstructions, "a"
+	altinstruction_entry 661b, 663f, \cap, 662b-661b, 664f-663f
+	.popsection
+	.subsection 1
+663:	\insn2
+664:	.previous
+	.org	. - (664b-663b) + (662b-661b)
+	.org	. - (662b-661b) + (664b-663b)
+	.endif
+.endm
+
+/*
+ * Alternative sequences
+ *
+ * The code for the case where the capability is not present will be
+ * assembled and linked as normal. There are no restrictions on this
+ * code.
+ *
+ * The code for the case where the capability is present will be
+ * assembled into a special section to be used for dynamic patching.
+ * Code for that case must:
+ *
+ * 1. Be exactly the same length (in bytes) as the default code
+ *    sequence.
+ *
+ * 2. Not contain a branch target that is used outside of the
+ *    alternative sequence it is defined in (branches into an
+ *    alternative sequence are not fixed up).
+ */
+
+/*
+ * Begin an alternative code sequence.
+ */
+.macro alternative_if_not cap
+	.set .Lasm_alt_mode, 0
+	.pushsection .altinstructions, "a"
+	altinstruction_entry 661f, 663f, \cap, 662f-661f, 664f-663f
+	.popsection
+661:
+.endm
+
+.macro alternative_if cap
+	.set .Lasm_alt_mode, 1
+	.pushsection .altinstructions, "a"
+	altinstruction_entry 663f, 661f, \cap, 664f-663f, 662f-661f
+	.popsection
+	.subsection 1
+	.align 2	/* So GAS knows label 661 is suitably aligned */
+661:
+.endm
+
+.macro alternative_cb cb
+	.set .Lasm_alt_mode, 0
+	.pushsection .altinstructions, "a"
+	altinstruction_entry 661f, \cb, ARM64_CB_PATCH, 662f-661f, 0
+	.popsection
+661:
+.endm
+
+/*
+ * Provide the other half of the alternative code sequence.
+ */
+.macro alternative_else
+662:
+	.if .Lasm_alt_mode==0
+	.subsection 1
+	.else
+	.previous
+	.endif
+663:
+.endm
+
+/*
+ * Complete an alternative code sequence.
+ */
+.macro alternative_endif
+664:
+	.if .Lasm_alt_mode==0
+	.previous
+	.endif
+	.org	. - (664b-663b) + (662b-661b)
+	.org	. - (662b-661b) + (664b-663b)
+.endm
+
+/*
+ * Callback-based alternative epilogue
+ */
+.macro alternative_cb_end
+662:
+.endm
+
+/*
+ * Provides a trivial alternative or default sequence consisting solely
+ * of NOPs. The number of NOPs is chosen automatically to match the
+ * previous case.
+ */
+.macro alternative_else_nop_endif
+alternative_else
+	nops	(662b-661b) / AARCH64_INSN_SIZE
+alternative_endif
+.endm
+
+#define _ALTERNATIVE_CFG(insn1, insn2, cap, cfg, ...)	\
+	alternative_insn insn1, insn2, cap, IS_ENABLED(cfg)
+
+.macro user_alt, label, oldinstr, newinstr, cond
+9999:	alternative_insn "\oldinstr", "\newinstr", \cond
+	_asm_extable 9999b, \label
+.endm
+
+#endif  /*  __ASSEMBLY__  */
+
+/*
+ * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature));
+ *
+ * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature, CONFIG_FOO));
+ * N.B. If CONFIG_FOO is specified, but not selected, the whole block
+ *      will be omitted, including oldinstr.
+ */
+#define ALTERNATIVE(oldinstr, newinstr, ...)   \
+	_ALTERNATIVE_CFG(oldinstr, newinstr, __VA_ARGS__, 1)
+
+#endif /* __ASM_ALTERNATIVE_MACROS_H */
diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
index 619db9b4c9d5..a38b92e11811 100644
--- a/arch/arm64/include/asm/alternative.h
+++ b/arch/arm64/include/asm/alternative.h
@@ -2,17 +2,13 @@
 #ifndef __ASM_ALTERNATIVE_H
 #define __ASM_ALTERNATIVE_H
 
-#include <asm/cpucaps.h>
-#include <asm/insn.h>
-
-#define ARM64_CB_PATCH ARM64_NCAPS
+#include <asm/alternative-macros.h>
 
 #ifndef __ASSEMBLY__
 
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/stddef.h>
-#include <linux/stringify.h>
 
 struct alt_instr {
 	s32 orig_offset;	/* offset to original instruction */
@@ -35,264 +31,5 @@ void apply_alternatives_module(void *start, size_t length);
 static inline void apply_alternatives_module(void *start, size_t length) { }
 #endif
 
-#define ALTINSTR_ENTRY(feature)					              \
-	" .word 661b - .\n"				/* label           */ \
-	" .word 663f - .\n"				/* new instruction */ \
-	" .hword " __stringify(feature) "\n"		/* feature bit     */ \
-	" .byte 662b-661b\n"				/* source len      */ \
-	" .byte 664f-663f\n"				/* replacement len */
-
-#define ALTINSTR_ENTRY_CB(feature, cb)					      \
-	" .word 661b - .\n"				/* label           */ \
-	" .word " __stringify(cb) "- .\n"		/* callback */	      \
-	" .hword " __stringify(feature) "\n"		/* feature bit     */ \
-	" .byte 662b-661b\n"				/* source len      */ \
-	" .byte 664f-663f\n"				/* replacement len */
-
-/*
- * alternative assembly primitive:
- *
- * If any of these .org directive fail, it means that insn1 and insn2
- * don't have the same length. This used to be written as
- *
- * .if ((664b-663b) != (662b-661b))
- * 	.error "Alternatives instruction length mismatch"
- * .endif
- *
- * but most assemblers die if insn1 or insn2 have a .inst. This should
- * be fixed in a binutils release posterior to 2.25.51.0.2 (anything
- * containing commit 4e4d08cf7399b606 or c1baaddf8861).
- *
- * Alternatives with callbacks do not generate replacement instructions.
- */
-#define __ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg_enabled)	\
-	".if "__stringify(cfg_enabled)" == 1\n"				\
-	"661:\n\t"							\
-	oldinstr "\n"							\
-	"662:\n"							\
-	".pushsection .altinstructions,\"a\"\n"				\
-	ALTINSTR_ENTRY(feature)						\
-	".popsection\n"							\
-	".subsection 1\n"						\
-	"663:\n\t"							\
-	newinstr "\n"							\
-	"664:\n\t"							\
-	".org	. - (664b-663b) + (662b-661b)\n\t"			\
-	".org	. - (662b-661b) + (664b-663b)\n\t"			\
-	".previous\n"							\
-	".endif\n"
-
-#define __ALTERNATIVE_CFG_CB(oldinstr, feature, cfg_enabled, cb)	\
-	".if "__stringify(cfg_enabled)" == 1\n"				\
-	"661:\n\t"							\
-	oldinstr "\n"							\
-	"662:\n"							\
-	".pushsection .altinstructions,\"a\"\n"				\
-	ALTINSTR_ENTRY_CB(feature, cb)					\
-	".popsection\n"							\
-	"663:\n\t"							\
-	"664:\n\t"							\
-	".endif\n"
-
-#define _ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg, ...)	\
-	__ALTERNATIVE_CFG(oldinstr, newinstr, feature, IS_ENABLED(cfg))
-
-#define ALTERNATIVE_CB(oldinstr, cb) \
-	__ALTERNATIVE_CFG_CB(oldinstr, ARM64_CB_PATCH, 1, cb)
-#else
-
-#include <asm/assembler.h>
-
-.macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len
-	.word \orig_offset - .
-	.word \alt_offset - .
-	.hword \feature
-	.byte \orig_len
-	.byte \alt_len
-.endm
-
-.macro alternative_insn insn1, insn2, cap, enable = 1
-	.if \enable
-661:	\insn1
-662:	.pushsection .altinstructions, "a"
-	altinstruction_entry 661b, 663f, \cap, 662b-661b, 664f-663f
-	.popsection
-	.subsection 1
-663:	\insn2
-664:	.previous
-	.org	. - (664b-663b) + (662b-661b)
-	.org	. - (662b-661b) + (664b-663b)
-	.endif
-.endm
-
-/*
- * Alternative sequences
- *
- * The code for the case where the capability is not present will be
- * assembled and linked as normal. There are no restrictions on this
- * code.
- *
- * The code for the case where the capability is present will be
- * assembled into a special section to be used for dynamic patching.
- * Code for that case must:
- *
- * 1. Be exactly the same length (in bytes) as the default code
- *    sequence.
- *
- * 2. Not contain a branch target that is used outside of the
- *    alternative sequence it is defined in (branches into an
- *    alternative sequence are not fixed up).
- */
-
-/*
- * Begin an alternative code sequence.
- */
-.macro alternative_if_not cap
-	.set .Lasm_alt_mode, 0
-	.pushsection .altinstructions, "a"
-	altinstruction_entry 661f, 663f, \cap, 662f-661f, 664f-663f
-	.popsection
-661:
-.endm
-
-.macro alternative_if cap
-	.set .Lasm_alt_mode, 1
-	.pushsection .altinstructions, "a"
-	altinstruction_entry 663f, 661f, \cap, 664f-663f, 662f-661f
-	.popsection
-	.subsection 1
-	.align 2	/* So GAS knows label 661 is suitably aligned */
-661:
-.endm
-
-.macro alternative_cb cb
-	.set .Lasm_alt_mode, 0
-	.pushsection .altinstructions, "a"
-	altinstruction_entry 661f, \cb, ARM64_CB_PATCH, 662f-661f, 0
-	.popsection
-661:
-.endm
-
-/*
- * Provide the other half of the alternative code sequence.
- */
-.macro alternative_else
-662:
-	.if .Lasm_alt_mode==0
-	.subsection 1
-	.else
-	.previous
-	.endif
-663:
-.endm
-
-/*
- * Complete an alternative code sequence.
- */
-.macro alternative_endif
-664:
-	.if .Lasm_alt_mode==0
-	.previous
-	.endif
-	.org	. - (664b-663b) + (662b-661b)
-	.org	. - (662b-661b) + (664b-663b)
-.endm
-
-/*
- * Callback-based alternative epilogue
- */
-.macro alternative_cb_end
-662:
-.endm
-
-/*
- * Provides a trivial alternative or default sequence consisting solely
- * of NOPs. The number of NOPs is chosen automatically to match the
- * previous case.
- */
-.macro alternative_else_nop_endif
-alternative_else
-	nops	(662b-661b) / AARCH64_INSN_SIZE
-alternative_endif
-.endm
-
-#define _ALTERNATIVE_CFG(insn1, insn2, cap, cfg, ...)	\
-	alternative_insn insn1, insn2, cap, IS_ENABLED(cfg)
-
-.macro user_alt, label, oldinstr, newinstr, cond
-9999:	alternative_insn "\oldinstr", "\newinstr", \cond
-	_asm_extable 9999b, \label
-.endm
-
-/*
- * Generate the assembly for UAO alternatives with exception table entries.
- * This is complicated as there is no post-increment or pair versions of the
- * unprivileged instructions, and USER() only works for single instructions.
- */
-#ifdef CONFIG_ARM64_UAO
-	.macro uao_ldp l, reg1, reg2, addr, post_inc
-		alternative_if_not ARM64_HAS_UAO
-8888:			ldp	\reg1, \reg2, [\addr], \post_inc;
-8889:			nop;
-			nop;
-		alternative_else
-			ldtr	\reg1, [\addr];
-			ldtr	\reg2, [\addr, #8];
-			add	\addr, \addr, \post_inc;
-		alternative_endif
-
-		_asm_extable	8888b,\l;
-		_asm_extable	8889b,\l;
-	.endm
-
-	.macro uao_stp l, reg1, reg2, addr, post_inc
-		alternative_if_not ARM64_HAS_UAO
-8888:			stp	\reg1, \reg2, [\addr], \post_inc;
-8889:			nop;
-			nop;
-		alternative_else
-			sttr	\reg1, [\addr];
-			sttr	\reg2, [\addr, #8];
-			add	\addr, \addr, \post_inc;
-		alternative_endif
-
-		_asm_extable	8888b,\l;
-		_asm_extable	8889b,\l;
-	.endm
-
-	.macro uao_user_alternative l, inst, alt_inst, reg, addr, post_inc
-		alternative_if_not ARM64_HAS_UAO
-8888:			\inst	\reg, [\addr], \post_inc;
-			nop;
-		alternative_else
-			\alt_inst	\reg, [\addr];
-			add		\addr, \addr, \post_inc;
-		alternative_endif
-
-		_asm_extable	8888b,\l;
-	.endm
-#else
-	.macro uao_ldp l, reg1, reg2, addr, post_inc
-		USER(\l, ldp \reg1, \reg2, [\addr], \post_inc)
-	.endm
-	.macro uao_stp l, reg1, reg2, addr, post_inc
-		USER(\l, stp \reg1, \reg2, [\addr], \post_inc)
-	.endm
-	.macro uao_user_alternative l, inst, alt_inst, reg, addr, post_inc
-		USER(\l, \inst \reg, [\addr], \post_inc)
-	.endm
-#endif
-
-#endif  /*  __ASSEMBLY__  */
-
-/*
- * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature));
- *
- * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature, CONFIG_FOO));
- * N.B. If CONFIG_FOO is specified, but not selected, the whole block
- *      will be omitted, including oldinstr.
- */
-#define ALTERNATIVE(oldinstr, newinstr, ...)   \
-	_ALTERNATIVE_CFG(oldinstr, newinstr, __VA_ARGS__, 1)
-
+#endif /* __ASSEMBLY__ */
 #endif /* __ASM_ALTERNATIVE_H */
diff --git a/arch/arm64/include/asm/asm-uaccess.h b/arch/arm64/include/asm/asm-uaccess.h
index f68a0e64482a..0fa95d1b311f 100644
--- a/arch/arm64/include/asm/asm-uaccess.h
+++ b/arch/arm64/include/asm/asm-uaccess.h
@@ -2,7 +2,7 @@
 #ifndef __ASM_ASM_UACCESS_H
 #define __ASM_ASM_UACCESS_H
 
-#include <