[Xen-devel] [PATCH for-4.12 v2 2/7] xen/arm: p2m: Provide an helper to generate the VTTBR

[Julien Grall <julien.grall@xxxxxxx>]

A follow-up patch will need to generate the VTTBR in a few places.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

---
    Changes in v2:
        - Add Andrii's and Stefano's reviewed-by
---
 xen/arch/arm/p2m.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 059a39157a..38bfa9964f 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -41,6 +41,11 @@ static const paddr_t level_masks[] =
 static const uint8_t level_orders[] =
     { ZEROETH_ORDER, FIRST_ORDER, SECOND_ORDER, THIRD_ORDER };
 
+static uint64_t generate_vttbr(uint16_t vmid, mfn_t root_mfn)
+{
+    return (mfn_to_maddr(root_mfn) | ((uint64_t)vmid << 48));
+}
+
 /* Unlock the flush and do a P2M TLB flush if necessary */
 void p2m_write_unlock(struct p2m_domain *p2m)
 {
@@ -1364,7 +1369,7 @@ static int p2m_alloc_table(struct domain *d)
 
     p2m->root = page;
 
-    p2m->vttbr = page_to_maddr(p2m->root) | ((uint64_t)p2m->vmid << 48);
+    p2m->vttbr = generate_vttbr(p2m->vmid, page_to_mfn(p2m->root));
 
     /*
      * Make sure that all TLBs corresponding to the new VMID are flushed
-- 
2.11.0


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