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authorMarc Zyngier <marc.zyngier@arm.com>2016-06-30 20:40:47 +0300
committerChristoffer Dall <christoffer.dall@linaro.org>2016-07-04 00:41:27 +0300
commitcd602a37e80c791adf2a256d2aedec60b898cd51 (patch)
tree5af07f63d90e1b9eddc1b3d4a2afdb798a824c7e /arch/arm/kvm/init.S
parent26781f9ce16801a9c680dae1a7c1ca2fd3d112bd (diff)
downloadlinux-cd602a37e80c791adf2a256d2aedec60b898cd51.tar.xz
arm: KVM: Simplify HYP init
Just like for arm64, we can now make the HYP setup a lot simpler, and we can now initialise it in one go (instead of the two phases we currently have). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/init.S')
-rw-r--r--arch/arm/kvm/init.S49
1 files changed, 9 insertions, 40 deletions
diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S
index 1f9ae17476f9..b82a99dcfb61 100644
--- a/arch/arm/kvm/init.S
+++ b/arch/arm/kvm/init.S
@@ -32,23 +32,13 @@
* r2,r3 = Hypervisor pgd pointer
*
* The init scenario is:
- * - We jump in HYP with four parameters: boot HYP pgd, runtime HYP pgd,
- * runtime stack, runtime vectors
- * - Enable the MMU with the boot pgd
- * - Jump to a target into the trampoline page (remember, this is the same
- * physical page!)
- * - Now switch to the runtime pgd (same VA, and still the same physical
- * page!)
+ * - We jump in HYP with 3 parameters: runtime HYP pgd, runtime stack,
+ * runtime vectors
* - Invalidate TLBs
* - Set stack and vectors
+ * - Setup the page tables
+ * - Enable the MMU
* - Profit! (or eret, if you only care about the code).
- *
- * As we only have four registers available to pass parameters (and we
- * need six), we split the init in two phases:
- * - Phase 1: r0 = 0, r1 = 0, r2,r3 contain the boot PGD.
- * Provides the basic HYP init, and enable the MMU.
- * - Phase 2: r0 = ToS, r1 = vectors, r2,r3 contain the runtime PGD.
- * Switches to the runtime PGD, set stack and vectors.
*/
.text
@@ -68,8 +58,11 @@ __kvm_hyp_init:
W(b) .
__do_hyp_init:
- cmp r0, #0 @ We have a SP?
- bne phase2 @ Yes, second stage init
+ @ Set stack pointer
+ mov sp, r0
+
+ @ Set HVBAR to point to the HYP vectors
+ mcr p15, 4, r1, c12, c0, 0 @ HVBAR
@ Set the HTTBR to point to the hypervisor PGD pointer passed
mcrr p15, 4, rr_lo_hi(r2, r3), c2
@@ -114,33 +107,9 @@ __do_hyp_init:
THUMB( ldr r2, =(HSCTLR_M | HSCTLR_A | HSCTLR_TE) )
orr r1, r1, r2
orr r0, r0, r1
- isb
mcr p15, 4, r0, c1, c0, 0 @ HSCR
-
- @ End of init phase-1
- eret
-
-phase2:
- @ Set stack pointer
- mov sp, r0
-
- @ Set HVBAR to point to the HYP vectors
- mcr p15, 4, r1, c12, c0, 0 @ HVBAR
-
- @ Jump to the trampoline page
- ldr r0, =TRAMPOLINE_VA
- adr r1, target
- bfi r0, r1, #0, #PAGE_SHIFT
- ret r0
-
-target: @ We're now in the trampoline code, switch page tables
- mcrr p15, 4, rr_lo_hi(r2, r3), c2
isb
- @ Invalidate the old TLBs
- mcr p15, 4, r0, c8, c7, 0 @ TLBIALLH
- dsb ish
-
eret
.ltorg