[Minios-devel] [UNIKRAFT early RFC PATCH 06/11] plat/kvm: arm64: Add a parameter to start_mmu

[Jia He <justin.he@xxxxxxx>]

This is to bypass invalidate and clean pgtable D-cache. This is not
required when APs are booting up.

Signed-off-by: Jia He <justin.he@xxxxxxx>
---
 plat/kvm/arm/entry64.S     | 1 +
 plat/kvm/arm/pagetable64.S | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/plat/kvm/arm/entry64.S b/plat/kvm/arm/entry64.S
index ff63ee0..df59ef6 100644
--- a/plat/kvm/arm/entry64.S
+++ b/plat/kvm/arm/entry64.S
@@ -125,6 +125,7 @@ ENTRY(_libkvmplat_entry)
        msr VBAR_EL1, x29
 
        /* Enable the mmu */
+       mov x7, #0
        bl start_mmu
 
        /* Load dtb address to x0 as a parameter */
diff --git a/plat/kvm/arm/pagetable64.S b/plat/kvm/arm/pagetable64.S
index 7899c19..abb024f 100644
--- a/plat/kvm/arm/pagetable64.S
+++ b/plat/kvm/arm/pagetable64.S
@@ -36,6 +36,8 @@
 #include <uk/asm.h>
 #include <kvm-arm/mm.h>
 #include <arm/cpu_defs.h>
+#include <uk/config.h>
+
 /*
  * The following is the Memory Layout of AArch64 Virtual Machine
  * | 0 - 0x3FFFFFFF |   0x40000000 - 0x7FFFFFFFFF           |  512GB - 1TB   |
@@ -234,6 +236,9 @@ ENTRY(start_mmu)
        bfi x2, x3, #32, #3
        msr tcr_el1, x2
 
+       cmp x7, #1
+       beq 1f
+
        /* save lr */
        mov x22, x30
 
@@ -262,7 +267,7 @@ ENTRY(start_mmu)
 
        /* restore lr */
        mov x30, x22
-
+1:
        ret
 END(start_mmu)
 
-- 
2.17.1


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