[Xen-devel] [PATCH 09/12] xenpaging: prevent page-out of gfn 0x80

[Olaf Hering <olaf@xxxxxxxxx>]

Add a workaround for missing handling of paged-out pages during BIOS startup.
For some reason, only gfn 0x80 is affected.

(XEN) HVM3: HVM Loader
(XEN) traps.c:649:d3 Bad GMFN 80 (MFN ffffffffff) to MSR 40000000
(XEN) HVM3: Detected Xen v4.1
(XEN) HVM3: HVMLoader bug at util.c:604
(XEN) hvm.c:1085:d3 Triple fault on VCPU0 - invoking HVM system reset.

(XEN) HVM4: HVM Loader
(XEN) traps.c:649:d4 Bad GMFN 80 (MFN ffffffffff) to MSR 40000000
(XEN) io.c:194:d4 MMIO emulation failed @ 0018:9ffff: 00 6a 10 80 c4 82
(XEN) hvm.c:1085:d4 Triple fault on VCPU0 - invoking HVM system reset.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

---
Another part of the bugfix is the missing p2m_mem_paging_populate() call in
gfn_to_mfn()

 tools/xenpaging/policy_default.c |    3 +++
 1 file changed, 3 insertions(+)

--- xen-unstable.hg-4.1.22571.orig/tools/xenpaging/policy_default.c
+++ xen-unstable.hg-4.1.22571/tools/xenpaging/policy_default.c
@@ -76,6 +76,9 @@ int policy_init(xenpaging_t *paging)
     /* Don't page out page 0 */
     set_bit(0, bitmap);
 
+    /* this is the trap page, disabled for the time being */
+    set_bit(0x80, bitmap);
+
  out:
     return rc;
 }


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