[Xen-devel] [PATCH] xen/arm: Scrub heap pages during boot

[Julien Grall <julien.grall@xxxxxxxxxx>]

Scrub heap pages was disabled because it was slow on the models. Now that Xen
supports real hardware, it's possible to enable by default scrubbing.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>

---
    This patch should go to Xen 4.4. It avoid to give non-cleared page to
    a domain.

    The downside is it's now slow on models.

    The current implementation of scrub_heap_pages loop on every page in the
    frametable. On ARM, there is only which can contains MMIO. We are safe
    because when frametable is initialized, page are marked inuse. So the
    function won't clear theses pages.
---
 xen/arch/arm/setup.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 9fc40c8..d7c7f4d 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -764,10 +764,8 @@ void __init start_xen(unsigned long boot_phys_offset,
     if ( construct_dom0(dom0) != 0)
             panic("Could not set up DOM0 guest OS");
 
-    /* Scrub RAM that is still free and so may go to an unprivileged domain.
-       XXX too slow in simulator
-       scrub_heap_pages();
-    */
+    /* Scrub RAM that is still free and so may go to an unprivileged domain. */
+    scrub_heap_pages();
 
     init_constructors();
 
-- 
1.7.10.4


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