x86/mm: Provide support for multiple frame buffers in HVM guests.

Support is provided for both shadow and hardware assisted paging (HAP)
modes. This code bookkeeps the set of video frame buffers (vram),
detects when the guest has modified any of those buffers and, upon request,
returns a bitmap of the modified pages.
This lets other software components re-paint the portions of the monitor
(or monitors) that have changed.
Each monitor has a frame buffer of some size at some position
in guest physical memory.
The set of frame buffers being tracked can change over time as monitors
are plugged and unplugged.

Signed-off-by: Robert Phillips <robert.phillips@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>

Removed a stray #include and a few hard tabs.

Signed-off-by: Tim Deegan <tim@xen.org>

Committed-by: Tim Deegan <tim@xen.org>

1 files changed, 5 insertions, 10 deletions

diff --git a/xen/include/asm-x86/paging.h b/xen/include/asm-x86/paging.h
index c3a8848a56..e22df388ba 100644
--- a/xen/include/asm-x86/paging.h
+++ b/xen/include/asm-x86/paging.h
@@ -154,9 +154,13 @@ void paging_log_dirty_init(struct domain *d,
                            int  (*disable_log_dirty)(struct domain *d),
                            void (*clean_dirty_bitmap)(struct domain *d));
 
-/* mark a page as dirty */
+/* mark a gmfn as dirty, a wrapper around marking a gpfn as dirty */
 void paging_mark_dirty(struct domain *d, unsigned long guest_mfn);
 
+/* mark a gpfn as dirty */
+void paging_mark_dirty_gpfn(struct domain *d, unsigned long gpfn);
+
+
 /* is this guest page dirty? 
  * This is called from inside paging code, with the paging lock held. */
 int paging_mfn_is_dirty(struct domain *d, mfn_t gmfn);
@@ -183,15 +187,6 @@ int paging_mfn_is_dirty(struct domain *d, mfn_t gmfn);
 #define L4_LOGDIRTY_IDX(pfn) 0
 #endif
 
-/* VRAM dirty tracking support */
-struct sh_dirty_vram {
-    unsigned long begin_pfn;
-    unsigned long end_pfn;
-    paddr_t *sl1ma;
-    uint8_t *dirty_bitmap;
-    s_time_t last_dirty;
-};
-
 /*****************************************************************************
  * Entry points into the paging-assistance code */