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Re: [Xen-devel] [PATCH v8 8/8] xen/arm: map reserved-memory regions as normal memory in dom0


On 09/10/2018 00:37, Stefano Stabellini wrote:
reserved-memory regions should be mapped as normal memory.

This is already the case with p2m_mmio_direct_c. The hardware domain should have full control on the resulting attributes via its stage-1 mappings. So what's wrong with that p2m type?


 At the
moment, they get remapped as device memory because Xen doesn't know
better. Add an explicit check for it.

Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
  xen/arch/arm/domain_build.c | 7 +++++++
  1 file changed, 7 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index f552154..c7df4cf 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1307,6 +1307,13 @@ static int __init handle_node(struct domain *d, struct 
kernel_info *kinfo,
                 "WARNING: Path %s is reserved, skip the node as we may re-use the 
+ /*
+     * reserved-memory ranges should be mapped as normal memory in the
+     * p2m.
+     */
+    if ( !strcmp(dt_node_name(node), "reserved-memory") )
+        p2mt = p2m_ram_rw;
      res = handle_device(d, node, p2mt);
      if ( res)
          return res;

Julien Grall

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