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From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
	linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
	will@kernel.org, steve.capper@arm.com,
	linux-arm-kernel@lists.infradead.org, maz@kernel.org,
	james.morse@arm.com, vladimir.murzin@arm.com,
	mark.rutland@arm.com, tglx@linutronix.de,
	gregkh@linuxfoundation.org, allison@lohutok.net, info@metux.net,
	alexios.zavras@intel.com, sstabellini@kernel.org,
	boris.ostrovsky@oracle.com, jgross@suse.com, stefan@agner.ch,
	yamada.masahiro@socionext.com, xen-devel@lists.xenproject.org,
	linux@armlinux.org.uk, andrew.cooper3@citrix.com, julien@xen.org
Subject: [Xen-devel] [PATCH v4 6/6] arm64: remove the rest of asm-uaccess.h
Date: Wed,  4 Dec 2019 18:20:58 -0500
Message-ID: <20191204232058.2500117-7-pasha.tatashin@soleen.com> (raw)
In-Reply-To: <20191204232058.2500117-1-pasha.tatashin@soleen.com>

The __uaccess_ttbr0_disable and __uaccess_ttbr0_enable,
are the last two macros defined in asm-uaccess.h.

For now move them to entry.S where they are used. Eventually,
these macros should be replaced with C wrappers to reduce the
maintenance burden.

Also, once these macros are unified with the C counterparts, it
is a good idea to check that PAN is in correct state on every
enable/disable calls.

Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
---
 arch/arm64/include/asm/asm-uaccess.h | 39 ----------------------------
 arch/arm64/kernel/entry.S            | 27 ++++++++++++++++++-
 arch/arm64/lib/clear_user.S          |  2 +-
 arch/arm64/lib/copy_from_user.S      |  2 +-
 arch/arm64/lib/copy_in_user.S        |  2 +-
 arch/arm64/lib/copy_to_user.S        |  2 +-
 arch/arm64/mm/cache.S                |  1 -
 7 files changed, 30 insertions(+), 45 deletions(-)
 delete mode 100644 arch/arm64/include/asm/asm-uaccess.h

diff --git a/arch/arm64/include/asm/asm-uaccess.h b/arch/arm64/include/asm/asm-uaccess.h
deleted file mode 100644
index fba2a69f7fef..000000000000
--- a/arch/arm64/include/asm/asm-uaccess.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_ASM_UACCESS_H
-#define __ASM_ASM_UACCESS_H
-
-#include <asm/alternative.h>
-#include <asm/kernel-pgtable.h>
-#include <asm/mmu.h>
-#include <asm/sysreg.h>
-#include <asm/assembler.h>
-
-/*
- * User access enabling/disabling macros.
- */
-#ifdef CONFIG_ARM64_SW_TTBR0_PAN
-	.macro	__uaccess_ttbr0_disable, tmp1
-	mrs	\tmp1, ttbr1_el1			// swapper_pg_dir
-	bic	\tmp1, \tmp1, #TTBR_ASID_MASK
-	sub	\tmp1, \tmp1, #RESERVED_TTBR0_SIZE	// reserved_ttbr0 just before swapper_pg_dir
-	msr	ttbr0_el1, \tmp1			// set reserved TTBR0_EL1
-	isb
-	add	\tmp1, \tmp1, #RESERVED_TTBR0_SIZE
-	msr	ttbr1_el1, \tmp1		// set reserved ASID
-	isb
-	.endm
-
-	.macro	__uaccess_ttbr0_enable, tmp1, tmp2
-	get_current_task \tmp1
-	ldr	\tmp1, [\tmp1, #TSK_TI_TTBR0]	// load saved TTBR0_EL1
-	mrs	\tmp2, ttbr1_el1
-	extr    \tmp2, \tmp2, \tmp1, #48
-	ror     \tmp2, \tmp2, #16
-	msr	ttbr1_el1, \tmp2		// set the active ASID
-	isb
-	msr	ttbr0_el1, \tmp1		// set the non-PAN TTBR0_EL1
-	isb
-	.endm
-#endif
-
-#endif
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 583f71abbe98..446d90ab31af 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -22,8 +22,8 @@
 #include <asm/mmu.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
+#include <asm/kernel-pgtable.h>
 #include <asm/thread_info.h>
-#include <asm/asm-uaccess.h>
 #include <asm/unistd.h>
 
 /*
@@ -143,6 +143,31 @@ alternative_cb_end
 #endif
 	.endm
 
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+	.macro	__uaccess_ttbr0_disable, tmp1
+	mrs	\tmp1, ttbr1_el1		// swapper_pg_dir
+	bic	\tmp1, \tmp1, #TTBR_ASID_MASK
+	sub	\tmp1, \tmp1, #RESERVED_TTBR0_SIZE // reserved_ttbr0 just before swapper_pg_dir
+	msr	ttbr0_el1, \tmp1		// set reserved TTBR0_EL1
+	isb
+	add	\tmp1, \tmp1, #RESERVED_TTBR0_SIZE
+	msr	ttbr1_el1, \tmp1		// set reserved ASID
+	isb
+	.endm
+
+	.macro	__uaccess_ttbr0_enable, tmp1, tmp2
+	get_current_task \tmp1
+	ldr	\tmp1, [\tmp1, #TSK_TI_TTBR0]	// load saved TTBR0_EL1
+	mrs	\tmp2, ttbr1_el1
+	extr	\tmp2, \tmp2, \tmp1, #48
+	ror	\tmp2, \tmp2, #16
+	msr	ttbr1_el1, \tmp2		// set the active ASID
+	isb
+	msr	ttbr0_el1, \tmp1		// set the non-PAN TTBR0_EL1
+	isb
+	.endm
+#endif
+
 	.macro	kernel_entry, el, regsize = 64
 	.if	\regsize == 32
 	mov	w0, w0				// zero upper 32 bits of x0
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S
index aeafc03e961a..b0b4a86a09e2 100644
--- a/arch/arm64/lib/clear_user.S
+++ b/arch/arm64/lib/clear_user.S
@@ -6,7 +6,7 @@
  */
 #include <linux/linkage.h>
 
-#include <asm/asm-uaccess.h>
+#include <asm/alternative.h>
 #include <asm/assembler.h>
 
 	.text
diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
index ebb3c06cbb5d..142bc7505518 100644
--- a/arch/arm64/lib/copy_from_user.S
+++ b/arch/arm64/lib/copy_from_user.S
@@ -5,7 +5,7 @@
 
 #include <linux/linkage.h>
 
-#include <asm/asm-uaccess.h>
+#include <asm/alternative.h>
 #include <asm/assembler.h>
 #include <asm/cache.h>
 
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S
index 3d8153a1ebce..04dc48ca26f7 100644
--- a/arch/arm64/lib/copy_in_user.S
+++ b/arch/arm64/lib/copy_in_user.S
@@ -7,7 +7,7 @@
 
 #include <linux/linkage.h>
 
-#include <asm/asm-uaccess.h>
+#include <asm/alternative.h>
 #include <asm/assembler.h>
 #include <asm/cache.h>
 
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
index 357eae2c18eb..8f3218ae88ab 100644
--- a/arch/arm64/lib/copy_to_user.S
+++ b/arch/arm64/lib/copy_to_user.S
@@ -5,7 +5,7 @@
 
 #include <linux/linkage.h>
 
-#include <asm/asm-uaccess.h>
+#include <asm/alternative.h>
 #include <asm/assembler.h>
 #include <asm/cache.h>
 
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 0093bb9fcd12..627be857b8d0 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S
@@ -12,7 +12,6 @@
 #include <asm/assembler.h>
 #include <asm/cpufeature.h>
 #include <asm/alternative.h>
-#include <asm/asm-uaccess.h>
 
 /*
  *	__asm_flush_cache_user_range(start,end)
-- 
2.24.0


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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 23:20 [Xen-devel] [PATCH v4 0/6] Use C inlines for uaccess Pavel Tatashin
2019-12-04 23:20 ` [Xen-devel] [PATCH v4 1/6] arm/arm64/xen: hypercall.h add includes guards Pavel Tatashin
2019-12-04 23:20 ` [Xen-devel] [PATCH v4 2/6] arm/arm64/xen: use C inlines for privcmd_call Pavel Tatashin
2019-12-04 23:20 ` [Xen-devel] [PATCH v4 3/6] arm64: remove uaccess_ttbr0 asm macros from cache functions Pavel Tatashin
2019-12-07 20:33   ` kbuild test robot
2019-12-04 23:20 ` [Xen-devel] [PATCH v4 4/6] arm64: remove __asm_flush_icache_range Pavel Tatashin
2019-12-04 23:20 ` [Xen-devel] [PATCH v4 5/6] arm64: move ARM64_HAS_CACHE_DIC/_IDC from asm to C Pavel Tatashin
2019-12-04 23:20 ` Pavel Tatashin [this message]

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