George Dunlap
2008-Dec-23 13:36 UTC
[Xen-devel] [RFC][PATCH] 1/9 Populate-on-demand memory: p2m query type
Add a p2m query type.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
diff -r e9c8cd6c3de7 xen/arch/x86/mm/hap/p2m-ept.c
--- a/xen/arch/x86/mm/hap/p2m-ept.c Wed Nov 19 15:49:55 2008 +0000
+++ b/xen/arch/x86/mm/hap/p2m-ept.c Wed Nov 19 16:00:04 2008 +0000
@@ -274,7 +274,8 @@
}
/* Read ept p2m entries */
-static mfn_t ept_get_entry(struct domain *d, unsigned long gfn, p2m_type_t *t)
+static mfn_t ept_get_entry(struct domain *d, unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
ept_entry_t *table
map_domain_page(mfn_x(pagetable_get_mfn(d->arch.phys_table)));
@@ -359,9 +360,10 @@
return content;
}
-static mfn_t ept_get_entry_current(unsigned long gfn, p2m_type_t *t)
+static mfn_t ept_get_entry_current(unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
- return ept_get_entry(current->domain, gfn, t);
+ return ept_get_entry(current->domain, gfn, t, q);
}
void ept_change_entry_emt_with_range(struct domain *d, unsigned long start_gfn,
diff -r e9c8cd6c3de7 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c Wed Nov 19 15:49:55 2008 +0000
+++ b/xen/arch/x86/mm/p2m.c Wed Nov 19 16:00:04 2008 +0000
@@ -345,7 +345,8 @@
}
static mfn_t
-p2m_gfn_to_mfn(struct domain *d, unsigned long gfn, p2m_type_t *t)
+p2m_gfn_to_mfn(struct domain *d, unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
mfn_t mfn;
paddr_t addr = ((paddr_t)gfn) << PAGE_SHIFT;
@@ -436,7 +437,8 @@
}
/* Read the current domain''s p2m table (through the linear mapping).
*/
-static mfn_t p2m_gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t)
+static mfn_t p2m_gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
mfn_t mfn = _mfn(INVALID_MFN);
p2m_type_t p2mt = p2m_mmio_dm;
diff -r e9c8cd6c3de7 xen/include/asm-x86/guest_pt.h
--- a/xen/include/asm-x86/guest_pt.h Wed Nov 19 15:49:55 2008 +0000
+++ b/xen/include/asm-x86/guest_pt.h Wed Nov 19 16:00:04 2008 +0000
@@ -49,7 +49,7 @@
/* Override gfn_to_mfn to work with gfn_t */
#undef gfn_to_mfn
-#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), gfn_x(g), (t))
+#define gfn_to_mfn(d, g, t) _gfn_to_mfn_type((d), gfn_x(g), (t), p2m_alloc)
/* Types of the guest''s page tables and access functions for them */
diff -r e9c8cd6c3de7 xen/include/asm-x86/p2m.h
--- a/xen/include/asm-x86/p2m.h Wed Nov 19 15:49:55 2008 +0000
+++ b/xen/include/asm-x86/p2m.h Wed Nov 19 16:00:04 2008 +0000
@@ -66,6 +66,12 @@
p2m_mmio_direct = 5, /* Read/write mapping of genuine MMIO area */
} p2m_type_t;
+typedef enum {
+ p2m_query = 0, /* Do not populate a PoD entries */
+ p2m_alloc = 1, /* Automatically populate PoD entries */
+ p2m_guest = 2, /* Guest demand-fault; implies alloc */
+} p2m_query_t;
+
/* We use bitmaps and maks to handle groups of types */
#define p2m_to_mask(_t) (1UL << (_t))
@@ -105,9 +111,11 @@
mfn_t mfn, unsigned int page_order,
p2m_type_t p2mt);
mfn_t (*get_entry )(struct domain *d, unsigned long gfn,
- p2m_type_t *p2mt);
+ p2m_type_t *p2mt,
+ p2m_query_t q);
mfn_t (*get_entry_current)(unsigned long gfn,
- p2m_type_t *p2mt);
+ p2m_type_t *p2mt,
+ p2m_query_t q);
void (*change_entry_type_global)(struct domain *d,
p2m_type_t ot,
p2m_type_t nt);
@@ -123,23 +131,26 @@
return (flags >> 9) & 0x7;
}
-/* Read the current domain''s p2m table. */
-static inline mfn_t gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t)
+/* Read the current domain''s p2m table. Do not populate PoD pages. */
+static inline mfn_t gfn_to_mfn_type_current(unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
- return current->domain->arch.p2m->get_entry_current(gfn, t);
+ return current->domain->arch.p2m->get_entry_current(gfn, t, q);
}
-/* Read another domain''s P2M table, mapping pages as we go */
+/* Read another domain''s P2M table, mapping pages as we go.
+ * Do not populate PoD pages. */
static inline
-mfn_t gfn_to_mfn_foreign(struct domain *d, unsigned long gfn, p2m_type_t *t)
+mfn_t gfn_to_mfn_type_foreign(struct domain *d, unsigned long gfn,
p2m_type_t *t,
+ p2m_query_t q)
{
- return d->arch.p2m->get_entry(d, gfn, t);
+ return d->arch.p2m->get_entry(d, gfn, t, q);
}
/* General conversion function from gfn to mfn */
-#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), (g), (t))
-static inline mfn_t _gfn_to_mfn(struct domain *d,
- unsigned long gfn, p2m_type_t *t)
+static inline mfn_t _gfn_to_mfn_type(struct domain *d,
+ unsigned long gfn, p2m_type_t *t,
+ p2m_query_t q)
{
if ( !paging_mode_translate(d) )
{
@@ -149,10 +160,17 @@
return _mfn(gfn);
}
if ( likely(current->domain == d) )
- return gfn_to_mfn_current(gfn, t);
+ return gfn_to_mfn_type_current(gfn, t, q);
else
- return gfn_to_mfn_foreign(d, gfn, t);
+ return gfn_to_mfn_type_foreign(d, gfn, t, q);
}
+
+#define gfn_to_mfn(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_alloc)
+#define gfn_to_mfn_query(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_query)
+#define gfn_to_mfn_guest(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_guest)
+
+#define gfn_to_mfn_current(g, t) gfn_to_mfn_type_current((g), (t), p2m_alloc)
+#define gfn_to_mfn_foreign(d, g, t) gfn_to_mfn_type_foreign((d), (g),
(t), p2m_alloc)
/* Compatibility function exporting the old untyped interface */
static inline unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn)
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel