[Xen-devel] [PATCH 9 of 9] x86/mm: Allow pages typed as log dirty to also be shared

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 xen/arch/x86/mm/mem_sharing.c |  3 +++
 xen/include/asm-x86/p2m.h     |  3 ++-
 2 files changed, 5 insertions(+), 1 deletions(-)


Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

diff -r 3489152b3a56 -r 4ee6d40edc2c xen/arch/x86/mm/mem_sharing.c
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -697,6 +697,9 @@ private_page_found:
     /* Update m2p entry */
     set_gpfn_from_mfn(mfn_x(page_to_mfn(page)), gfn);
 
+    /* Now that the gfn<->mfn map is properly established,
+     * marking dirty is feasible */
+    paging_mark_dirty(d, mfn_x(page_to_mfn(page)));
     put_gfn(d, gfn);
     shr_unlock();
     return 0;
diff -r 3489152b3a56 -r 4ee6d40edc2c xen/include/asm-x86/p2m.h
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -163,7 +163,8 @@ typedef enum {
 /* Shared types */
 /* XXX: Sharable types could include p2m_ram_ro too, but we would need to
  * reinit the type correctly after fault */
-#define P2M_SHARABLE_TYPES (p2m_to_mask(p2m_ram_rw))
+#define P2M_SHARABLE_TYPES (p2m_to_mask(p2m_ram_rw) \
+                            | p2m_to_mask(p2m_ram_logdirty) )
 #define P2M_SHARED_TYPES   (p2m_to_mask(p2m_ram_shared))
 
 /* Broken type: the frame backing this pfn has failed in hardware

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