[Xen-devel] [PATCH v2] xen/arm: p2m: configure stage-2 page table to support upto 42-bit PA systems

[Vishnu Pajjuri OS <vishnu@xxxxxxxxxxxxxxxxxxxxxx>]

XEN configures stage-2 page table to expose 40 bits of IPA
(Intermediate Physical Address) bits for systems with 42 bits of PA
(Physical Address). This setting prevents the 42-bit PA systems from booting
DOM0's kernel since access above 40 bits results in a fault.

This patch adds support for 42-bit system
which has a full 42-bit address range.

The fix will allocate 8 pages for stage 2 mapping for both DOM0 and guests.
It is a bit wasteful but not an issue since most of these systems should have
sufficiently large memory capacity.

Signed-off-by: Feng Kan <fengkan@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vishnu <vishnu@xxxxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/p2m.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 92c2413..7712991 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1995,7 +1995,7 @@ void __init setup_virt_paging(void)
         [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 */
--
1.8.3.1

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