[Xen-devel] [PATCH 06/10] xen/setup: Only set identity mapping in E820 regions when privileged.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

We do not want to set the identity mapping on E820 reserved
regions when running as PV. This is b/c the 0->ISA_END_ADDRESS region
would be considered identity and we would try to read DMI information
and fail (since the pfn_to_mfn(mfn)==pfn) under PV guests.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/xen/setup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 752c865..34fb906 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -160,7 +160,7 @@ static unsigned long __init xen_set_identity(const struct 
e820map *e820)
                if (end < start)
                        continue;
 
-               if (e820->map[i].type != E820_RAM) {
+               if (xen_initial_domain() && e820->map[i].type != E820_RAM) {
                        for (pfn = PFN_UP(start); pfn < PFN_DOWN(end); pfn++)
                                set_phys_to_machine(pfn, pfn);
                        identity += pfn - PFN_UP(start);
-- 
1.7.1


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