[Xen-devel] [PATCH] xen/arm: p2m: configure pa_range_info table to support 42 bit PA systems.

[Vishnu Pajjuri OS <vishnu@xxxxxxxxxxxxxxxxxxxxxx>]

Current pa_range_info table's configuration prevents 42 bit PA systems
from booting DOM0. This patch modifies t0sz=22 and root_order=3
to expose 42-bit IPA (Intermediate Physical Address).

It is required for hardware which is having peripherals above 40 bits.

Signed-off-by: Vishnu <vishnu@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Feng Kan <fengkan@xxxxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/p2m.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index c38bd7e16e..c8e7598d81 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1992,10 +1992,13 @@ void __init setup_virt_paging(void)
     } pa_range_info[] = {
         /* T0SZ minimum and SL0 maximum from ARM DDI 0487A.b Table D4-5 */
         /*      PA size, t0sz(min), root-order, sl0(max) */
+       /* TODO: 42 bit PA systems allocate 8 pages by default
+        * for both DOM0 and guests.
+        */
         [0] = { 32,      32/*32*/,  0,          1 },
         [1] = { 36,      28/*28*/,  0,          1 },
         [2] = { 40,      24/*24*/,  1,          1 },
-        [3] = { 42,      24/*22*/,  1,          1 },
+        [3] = { 42,      22/*22*/,  3,          1 },
         [4] = { 44,      20/*20*/,  0,          2 },
         [5] = { 48,      16/*16*/,  0,          2 },
         [6] = { 0 }, /* Invalid */
--
2.19.1


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