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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-20 00:10:27 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-20 00:10:27 -0300
commitd0b2f91bede3bd5e3d24dd6803e56eee959c1797 (patch)
tree7fee4ab0509879c373c4f2cbd5b8a5be5b4041ee /arch/arm64/kvm/hyp-init.S
parente914f8eb445e8f74b00303c19c2ffceaedd16a05 (diff)
Linux-libre 4.8.2-gnupck-4.8.2-gnu
Diffstat (limited to 'arch/arm64/kvm/hyp-init.S')
-rw-r--r--arch/arm64/kvm/hyp-init.S61
1 files changed, 8 insertions, 53 deletions
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index a873a6d8b..6b29d3d9e 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -53,10 +53,9 @@ __invalid:
b .
/*
- * x0: HYP boot pgd
- * x1: HYP pgd
- * x2: HYP stack
- * x3: HYP vectors
+ * x0: HYP pgd
+ * x1: HYP stack
+ * x2: HYP vectors
*/
__do_hyp_init:
@@ -110,71 +109,27 @@ __do_hyp_init:
msr sctlr_el2, x4
isb
- /* Skip the trampoline dance if we merged the boot and runtime PGDs */
- cmp x0, x1
- b.eq merged
-
- /* MMU is now enabled. Get ready for the trampoline dance */
- ldr x4, =TRAMPOLINE_VA
- adr x5, target
- bfi x4, x5, #0, #PAGE_SHIFT
- br x4
-
-target: /* We're now in the trampoline code, switch page tables */
- msr ttbr0_el2, x1
- isb
-
- /* Invalidate the old TLBs */
- tlbi alle2
- dsb sy
-
-merged:
/* Set the stack and new vectors */
+ kern_hyp_va x1
+ mov sp, x1
kern_hyp_va x2
- mov sp, x2
- kern_hyp_va x3
- msr vbar_el2, x3
+ msr vbar_el2, x2
/* Hello, World! */
eret
ENDPROC(__kvm_hyp_init)
/*
- * Reset kvm back to the hyp stub. This is the trampoline dance in
- * reverse. If kvm used an extended idmap, __extended_idmap_trampoline
- * calls this code directly in the idmap. In this case switching to the
- * boot tables is a no-op.
- *
- * x0: HYP boot pgd
- * x1: HYP phys_idmap_start
+ * Reset kvm back to the hyp stub.
*/
ENTRY(__kvm_hyp_reset)
- /* We're in trampoline code in VA, switch back to boot page tables */
- msr ttbr0_el2, x0
- isb
-
- /* Ensure the PA branch doesn't find a stale tlb entry or stale code. */
- ic iallu
- tlbi alle2
- dsb sy
- isb
-
- /* Branch into PA space */
- adr x0, 1f
- bfi x1, x0, #0, #PAGE_SHIFT
- br x1
-
/* We're now in idmap, disable MMU */
-1: mrs x0, sctlr_el2
+ mrs x0, sctlr_el2
ldr x1, =SCTLR_ELx_FLAGS
bic x0, x0, x1 // Clear SCTL_M and etc
msr sctlr_el2, x0
isb
- /* Invalidate the old TLBs */
- tlbi alle2
- dsb sy
-
/* Install stub vectors */
adr_l x0, __hyp_stub_vectors
msr vbar_el2, x0