[Xen-devel] [PATCH v2 3/3] arm64: remove the rest of asm-uaccess.h

[Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>]

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

Replace them with C wrappers and call C functions from
kernel_entry and kernel_exit.

Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
---
 arch/arm64/include/asm/asm-uaccess.h | 38 ----------------------------
 arch/arm64/kernel/entry.S            |  6 ++---
 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 -
 arch/arm64/mm/context.c              | 12 +++++++++
 8 files changed, 19 insertions(+), 46 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 8f763e5b41b1..000000000000
--- a/arch/arm64/include/asm/asm-uaccess.h
+++ /dev/null
@@ -1,38 +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..c7b571e6d0f2 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>
 
 /*
@@ -219,7 +219,7 @@ alternative_else_nop_endif
        and     x23, x23, #~PSR_PAN_BIT         // Clear the emulated PAN in 
the saved SPSR
        .endif
 
-       __uaccess_ttbr0_disable x21
+       bl __uaccess_ttbr0_disable_c
 1:
 #endif
 
@@ -293,7 +293,7 @@ alternative_else_nop_endif
        tbnz    x22, #22, 1f                    // Skip re-enabling TTBR0 
access if the PSR_PAN_BIT is set
        .endif
 
-       __uaccess_ttbr0_enable x0, x1
+       bl      __uaccess_ttbr0_enable_c
 
        .if     \el == 0
        /*
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 408d317a47d2..7940d6ef5da5 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>
 
 /*
  *     __arch_flush_icache_range(start,end)
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index b5e329fde2dd..4fc32c504dea 100644
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -237,6 +237,18 @@ void check_and_switch_context(struct mm_struct *mm, 
unsigned int cpu)
                cpu_switch_mm(mm->pgd, mm);
 }
 
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+asmlinkage void __uaccess_ttbr0_enable_c(void)
+{
+       __uaccess_ttbr0_enable();
+}
+
+asmlinkage void __uaccess_ttbr0_disable_c(void)
+{
+       __uaccess_ttbr0_disable();
+}
+#endif
+
 /* Errata workaround post TTBRx_EL1 update. */
 asmlinkage void post_ttbr_update_workaround(void)
 {
-- 
2.24.0


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