ARM: kvm: replace open coded VA->PA calculations with adr_l call

Replace the open coded calculations of the actual physical address
of the KVM stub vector table with a single adr_l invocation.

Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 5b591dacbaaf60d3b1ba31c79cd97f47623125c0..9905fb7560df215d5a57b181135e266f379fd374 100644 (file)
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -468,15 +468,10 @@ dtb_check_done:
 
                /*
                 * Compute the address of the hyp vectors after relocation.
-                * This requires some arithmetic since we cannot directly
-                * reference __hyp_stub_vectors in a PC-relative way.
                 * Call __hyp_set_vectors with the new address so that we
                 * can HVC again after the copy.
                 */
-0:             adr     r0, 0b
-               movw    r1, #:lower16:__hyp_stub_vectors - 0b
-               movt    r1, #:upper16:__hyp_stub_vectors - 0b
-               add     r0, r0, r1
+               adr_l   r0, __hyp_stub_vectors
                sub     r0, r0, r5
                add     r0, r0, r10
                bl      __hyp_set_vectors
@@ -627,17 +622,11 @@ not_relocated:    mov     r0, #0
                cmp     r0, #HYP_MODE           @ if not booted in HYP mode...
                bne     __enter_kernel          @ boot kernel directly
 
-               adr     r12, .L__hyp_reentry_vectors_offset
-               ldr     r0, [r12]
-               add     r0, r0, r12
-
+               adr_l   r0, __hyp_reentry_vectors
                bl      __hyp_set_vectors
                __HVC(0)                        @ otherwise bounce to hyp mode
 
                b       .                       @ should never be reached
-
-               .align  2
-.L__hyp_reentry_vectors_offset:        .long   __hyp_reentry_vectors - .
 #else
                b       __enter_kernel
 #endif

diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
index 26d8e03b1dd336daecabcdba10480ffa83801d2a..103d0bdb2b7e44c3aab86609165b93e7df08df4e 100644 (file)
--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -24,41 +24,38 @@ ENTRY(__boot_cpu_mode)
 .text
 
        /*
-        * Save the primary CPU boot mode. Requires 3 scratch registers.
+        * Save the primary CPU boot mode. Requires 2 scratch registers.
         */
-       .macro  store_primary_cpu_mode  reg1, reg2, reg3
+       .macro  store_primary_cpu_mode  reg1, reg2
        mrs     \reg1, cpsr
        and     \reg1, \reg1, #MODE_MASK
-       adr     \reg2, .L__boot_cpu_mode_offset
-       ldr     \reg3, [\reg2]
-       str     \reg1, [\reg2, \reg3]
+       str_l   \reg1, __boot_cpu_mode, \reg2
        .endm
 
        /*
         * Compare the current mode with the one saved on the primary CPU.
         * If they don't match, record that fact. The Z bit indicates
         * if there's a match or not.
-        * Requires 3 additionnal scratch registers.
+        * Requires 2 additional scratch registers.
         */
-       .macro  compare_cpu_mode_with_primary mode, reg1, reg2, reg3
-       adr     \reg2, .L__boot_cpu_mode_offset
-       ldr     \reg3, [\reg2]
-       ldr     \reg1, [\reg2, \reg3]
+       .macro  compare_cpu_mode_with_primary mode, reg1, reg2
+       adr_l   \reg2, __boot_cpu_mode
+       ldr     \reg1, [\reg2]
        cmp     \mode, \reg1            @ matches primary CPU boot mode?
        orrne   \reg1, \reg1, #BOOT_CPU_MODE_MISMATCH
-       strne   \reg1, [\reg2, \reg3]   @ record what happened and give up
+       strne   \reg1, [\reg2]          @ record what happened and give up
        .endm
 
 #else  /* ZIMAGE */
 
-       .macro  store_primary_cpu_mode  reg1:req, reg2:req, reg3:req
+       .macro  store_primary_cpu_mode  reg1:req, reg2:req
        .endm
 
 /*
  * The zImage loader only runs on one CPU, so we don't bother with mult-CPU
  * consistency checking:
  */
-       .macro  compare_cpu_mode_with_primary mode, reg1, reg2, reg3
+       .macro  compare_cpu_mode_with_primary mode, reg1, reg2
        cmp     \mode, \mode
        .endm
 
@@ -73,7 +70,7 @@ ENTRY(__boot_cpu_mode)
  */
 @ Call this from the primary CPU
 ENTRY(__hyp_stub_install)
-       store_primary_cpu_mode  r4, r5, r6
+       store_primary_cpu_mode  r4, r5
 ENDPROC(__hyp_stub_install)
 
        @ fall through...
@@ -87,7 +84,7 @@ ENTRY(__hyp_stub_install_secondary)
         * If the secondary has booted with a different mode, give up
         * immediately.
         */
-       compare_cpu_mode_with_primary   r4, r5, r6, r7
+       compare_cpu_mode_with_primary   r4, r5, r6
        retne   lr
 
        /*