xen/x86: consolidate vram tracking support

Flag PG_log_dirty is for paging log dirty support, not vram tracking support.
However data structure sh_dirty_vram{} and function paging_log_dirty_range()
designed for vram tracking support, are guarded with PG_log_dirty.
We release both from PG_log_dirty, and also move paging_log_dirty_range(),
remamed with p2m_log_dirty_range(), into p2m.c, where it logically belongs.

Signed-off-by: Penny Zheng <Penny.Zheng@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/include/asm/p2m.h

@@ -1110,6 +1110,10 @@ static inline int p2m_entry_modify(struct p2m_domain *p2m, p2m_type_t nt,
 
 #endif /* CONFIG_HVM */
 
+/* Get the dirty bitmap for a specific range of pfns */
+void p2m_log_dirty_range(struct domain *d, unsigned long begin_pfn,
+                         unsigned long nr, uint8_t *dirty_bitmap);
+
 #endif /* _XEN_ASM_X86_P2M_H */
 
 /*

xen/arch/x86/include/asm/paging.h

@@ -133,13 +133,20 @@ struct paging_mode {
     (DIV_ROUND_UP(PADDR_BITS - PAGE_SHIFT - (PAGE_SHIFT + 3), \
                   PAGE_SHIFT - ilog2(sizeof(mfn_t))) + 1)
 
-#if PG_log_dirty
+#ifdef CONFIG_HVM
+/* VRAM dirty tracking support */
+struct sh_dirty_vram {
+    unsigned long begin_pfn;
+    unsigned long end_pfn;
+#ifdef CONFIG_SHADOW_PAGING
+    paddr_t *sl1ma;
+    uint8_t *dirty_bitmap;
+    s_time_t last_dirty;
+#endif
+};
+#endif
 
-/* get the dirty bitmap for a specific range of pfns */
-void paging_log_dirty_range(struct domain *d,
-                            unsigned long begin_pfn,
-                            unsigned long nr,
-                            uint8_t *dirty_bitmap);
+#if PG_log_dirty
 
 /* log dirty initialization */
 void paging_log_dirty_init(struct domain *d, const struct log_dirty_ops *ops);
@@ -171,19 +178,6 @@ bool paging_mfn_is_dirty(const struct domain *d, mfn_t gmfn);
 #define L4_LOGDIRTY_IDX(pfn) ((pfn_x(pfn) >> (PAGE_SHIFT + 3 + PAGETABLE_ORDER * 2)) & \
                               (LOGDIRTY_NODE_ENTRIES-1))
 
-#ifdef CONFIG_HVM
-/* VRAM dirty tracking support */
-struct sh_dirty_vram {
-    unsigned long begin_pfn;
-    unsigned long end_pfn;
-#ifdef CONFIG_SHADOW_PAGING
-    paddr_t *sl1ma;
-    uint8_t *dirty_bitmap;
-    s_time_t last_dirty;
-#endif
-};
-#endif
-
 #else /* !PG_log_dirty */
 
 static inline void paging_log_dirty_init(struct domain *d,

xen/arch/x86/mm/hap/hap.c

@@ -42,7 +42,7 @@
  * Create a dirty vram range on demand when some [begin_pfn:begin_pfn+nr] is
  * first encountered.
  * Collect the guest_dirty bitmask, a bit mask of the dirty vram pages, by
- * calling paging_log_dirty_range(), which interrogates each vram
+ * calling p2m_log_dirty_range(), which interrogates each vram
  * page's p2m type looking for pages that have been made writable.
  */
 
@@ -119,7 +119,7 @@ int hap_track_dirty_vram(struct domain *d,
             p2m_flush_hardware_cached_dirty(d);
 
             /* get the bitmap */
-            paging_log_dirty_range(d, begin_pfn, nr_frames, dirty_bitmap);
+            p2m_log_dirty_range(d, begin_pfn, nr_frames, dirty_bitmap);
 
             domain_unpause(d);
         }

xen/arch/x86/mm/p2m.c

@@ -2161,6 +2161,34 @@ int relinquish_p2m_mapping(struct domain *d)
     return rc;
 }
 
+void p2m_log_dirty_range(struct domain *d, unsigned long begin_pfn,
+                         unsigned long nr, uint8_t *dirty_bitmap)
+{
+    struct p2m_domain *p2m = p2m_get_hostp2m(d);
+    unsigned int i;
+    unsigned long pfn;
+
+    /*
+     * Set l1e entries of P2M table to be read-only.
+     *
+     * On first write, it page faults, its entry is changed to read-write,
+     * and on retry the write succeeds.
+     *
+     * We populate dirty_bitmap by looking for entries that have been
+     * switched to read-write.
+     */
+
+    p2m_lock(p2m);
+
+    for ( i = 0, pfn = begin_pfn; pfn < begin_pfn + nr; i++, pfn++ )
+        if ( !p2m_change_type_one(d, pfn, p2m_ram_rw, p2m_ram_logdirty) )
+            dirty_bitmap[i >> 3] |= (1 << (i & 7));
+
+    p2m_unlock(p2m);
+
+    guest_flush_tlb_mask(d, d->dirty_cpumask);
+}
+
 /*
  * Local variables:
  * mode: C

xen/arch/x86/mm/paging.c

@@ -583,38 +583,6 @@ static int paging_log_dirty_op(struct domain *d,
     return rv;
 }
 
-#ifdef CONFIG_HVM
-void paging_log_dirty_range(struct domain *d,
-                           unsigned long begin_pfn,
-                           unsigned long nr,
-                           uint8_t *dirty_bitmap)
-{
-    struct p2m_domain *p2m = p2m_get_hostp2m(d);
-    int i;
-    unsigned long pfn;
-
-    /*
-     * Set l1e entries of P2M table to be read-only.
-     *
-     * On first write, it page faults, its entry is changed to read-write,
-     * and on retry the write succeeds.
-     *
-     * We populate dirty_bitmap by looking for entries that have been
-     * switched to read-write.
-     */
-
-    p2m_lock(p2m);
-
-    for ( i = 0, pfn = begin_pfn; pfn < begin_pfn + nr; i++, pfn++ )
-        if ( !p2m_change_type_one(d, pfn, p2m_ram_rw, p2m_ram_logdirty) )
-            dirty_bitmap[i >> 3] |= (1 << (i & 7));
-
-    p2m_unlock(p2m);
-
-    guest_flush_tlb_mask(d, d->dirty_cpumask);
-}
-#endif
-
 /*
  * Callers must supply log_dirty_ops for the log dirty code to call. This
  * function usually is invoked when paging is enabled. Check shadow_enable()