[Xen-devel] [PATCH v3 2/3] xen/arm: Add p2m_ipa_bits

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxx>]

From: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>

Export p2m_ipa_bits holding the bit size of IPA addresses used
in p2m tables.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
---
 xen/arch/arm/p2m.c        | 5 +++++
 xen/include/asm-arm/p2m.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 8dfee24..377e5e6 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -27,6 +27,9 @@ static unsigned int __read_mostly p2m_root_level;
 
 #define P2M_ROOT_PAGES    (1<<P2M_ROOT_ORDER)
 
+/* Size of IPA addresses in bits.  */
+unsigned int p2m_ipa_bits;
+
 static bool_t p2m_valid(lpae_t pte)
 {
     return pte.p2m.valid;
@@ -1515,6 +1518,7 @@ void __init setup_virt_paging(void)
 
 #ifdef CONFIG_ARM_32
     printk("P2M: 40-bit IPA\n");
+    p2m_ipa_bits = 40;
     val |= VTCR_T0SZ(0x18); /* 40 bit IPA */
     val |= VTCR_SL0(0x1); /* P2M starts at first level */
 #else /* CONFIG_ARM_64 */
@@ -1557,6 +1561,7 @@ void __init setup_virt_paging(void)
 
     p2m_root_order = pa_range_info[pa_range].root_order;
     p2m_root_level = 2 - pa_range_info[pa_range].sl0;
+    p2m_ipa_bits = 64 - pa_range_info[pa_range].t0sz;
 
     printk("P2M: %d-bit IPA with %d-bit PA\n",
            64 - pa_range_info[pa_range].t0sz,
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 341df55..0c808f4 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -10,6 +10,9 @@
 
 #define paddr_bits PADDR_BITS
 
+/* Holds the bitsize of IPA addresses in p2m tables.  */
+extern unsigned int p2m_ipa_bits;
+
 struct domain;
 
 extern void memory_type_changed(struct domain *);
-- 
1.9.1


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