[Xen-changelog] [xen master] libxc: set flag for support of linear p2m list in domain builder

[patchbot@xxxxxxx]

commit dc6d609371217f0afb94531a015b8a8042d35ce4
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Jan 7 13:36:54 2016 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Jan 7 12:49:34 2016 +0000

    libxc: set flag for support of linear p2m list in domain builder
    
    Set the SIF_VIRT_P2M_4TOOLS flag for pv-domUs in the domain builder
    to indicate the Xen tools have full support for the virtual mapped
    linear p2m list.
    
    This will enable pv-domUs to drop support of the 3 level p2m tree
    and use the linear list only. Without setting this flag some kernels
    might limit themselves to 512 GB memory size in order not to break
    migration.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 docs/features/migration.pandoc    |    7 ++++---
 tools/libxc/xc_dom_compat_linux.c |    2 +-
 tools/libxc/xc_dom_core.c         |    2 ++
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/docs/features/migration.pandoc b/docs/features/migration.pandoc
index 9852a19..151c50d 100644
--- a/docs/features/migration.pandoc
+++ b/docs/features/migration.pandoc
@@ -1,5 +1,5 @@
 % Migration
-% Revision 1
+% Revision 2
 
 \clearpage
 
@@ -95,7 +95,6 @@ scenarios, which will involve starting with VMs from Xen 4.5
 # Areas for improvement
 
 * Arm support
-* Linear P2M support for x86 PV
 * Live looping parameters
 
 # Known issues
@@ -105,7 +104,8 @@ scenarios, which will involve starting with VMs from Xen 4.5
 * x86 HVM with nested-virt (no relevant information included in the
   stream)
 * x86 PV ballooning (P2M marked dirty, target frame not marked)
-* x86 PV P2M structure changes (not noticed, stale mappings used)
+* x86 PV P2M structure changes (not noticed, stale mappings used) for
+  guests not using the linear p2m layout
 
 # References
 
@@ -120,4 +120,5 @@ for Migration v2
 Date       Revision Version  Notes
 ---------- -------- -------- -------------------------------------------
 2015-10-24 1        Xen 4.6  Document written
+2015-12-11 2        Xen 4.7  Support of linear p2m list
 ---------- -------- -------- -------------------------------------------
diff --git a/tools/libxc/xc_dom_compat_linux.c 
b/tools/libxc/xc_dom_compat_linux.c
index abbc09f..c922c61 100644
--- a/tools/libxc/xc_dom_compat_linux.c
+++ b/tools/libxc/xc_dom_compat_linux.c
@@ -59,7 +59,7 @@ int xc_linux_build(xc_interface *xch, uint32_t domid,
          ((rc = xc_dom_ramdisk_file(dom, initrd_name)) != 0) )
         goto out;
 
-    dom->flags = flags;
+    dom->flags |= flags;
     dom->console_evtchn = console_evtchn;
     dom->xenstore_evtchn = store_evtchn;
 
diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index 2061ba6..55c779d 100644
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -777,6 +777,8 @@ struct xc_dom_image *xc_dom_allocate(xc_interface *xch,
     dom->parms.elf_paddr_offset = UNSET_ADDR;
     dom->parms.p2m_base = UNSET_ADDR;
 
+    dom->flags = SIF_VIRT_P2M_4TOOLS;
+
     dom->alloc_malloc += sizeof(*dom);
     return dom;
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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