[Xen-devel] [PATCH 4/4] libxc: set flag for support of linear p2m list in domain builder

[Juergen Gross <jgross@xxxxxxxx>]

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>
---
 tools/libxc/xc_dom_compat_linux.c | 2 +-
 tools/libxc/xc_dom_core.c         | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

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;
 
-- 
2.6.2


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