[Xen-devel] [PATCH] xen: arm: implement domain_page_map_to_mfn

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

This was recently (re?)introduced on x86 in 26447:f831d8dcf18f and is
now used in generic code (specifically tmem in 26454:38847c15d8cd).

This fixes the build on ARM.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/arm/mm.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 9c5c334..7621d1b 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -208,6 +208,18 @@ void unmap_domain_page(const void *va)
     local_irq_restore(flags);
 }
 
+unsigned long domain_page_map_to_mfn(const void *va)
+{
+    lpae_t *map = xen_second + second_linear_offset(DOMHEAP_VIRT_START);
+    int slot = ((unsigned long) va - DOMHEAP_VIRT_START) >> SECOND_SHIFT;
+    unsigned long offset = ((unsigned long)va>>THIRD_SHIFT) & LPAE_ENTRY_MASK;
+
+    ASSERT(slot >= 0 && slot < DOMHEAP_ENTRIES);
+    ASSERT(map[slot].pt.avail != 0);
+
+    return map[slot].pt.base + offset;
+}
+
 void __init arch_init_memory(void)
 {
     /*
-- 
1.7.9.1


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