[Xen-devel] [PATCH v3 09/38] arm/p2m: Add backpointer to the domain in p2m_domain

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

With the introduction of altp2m, many functions have been adapted to
receive an argument of type "struct p2m_domain*" instead of "struct
domain*". A backpointer to the associated domain within the "struct
p2m_domain*" reduces the number of function parameters without losing
the accessibility of the "struct domain". The need for this pointer is
shown in the following commits.

Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/p2m.c        | 1 +
 xen/include/asm-arm/p2m.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index bfbccca..e859fca 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1280,6 +1280,7 @@ int p2m_init(struct domain *d)
     p2m->max_mapped_gfn = _gfn(0);
     p2m->lowest_mapped_gfn = _gfn(ULONG_MAX);
 
+    p2m->domain = d;
     p2m->default_access = p2m_access_rwx;
     p2m->mem_access_enabled = false;
     radix_tree_init(&p2m->mem_access_settings);
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 040ca13..fa07e19 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -100,6 +100,9 @@ struct p2m_domain {
 
     /* Choose between: host/alternate. */
     p2m_class_t p2m_class;
+
+    /* Back pointer to struct domain. */
+    struct domain *domain;
 };
 
 /*
-- 
2.9.0


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