[Xen-devel] [PATCH v3 3/7] x86/pvh: allow PVH Dom0 to use the debug IO port console

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Force trapping accesses to IO port 0xe9 for a PVH Dom0, so it can
print to the HVM debug console.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes since v2:
 - Always enable the E9 debug console.

Changes since v1:
 - Use a define for 0xe9.
 - Expand 'List of' in the Xen command doc.
---
 xen/arch/x86/dom0_build.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index fe73cef899..038e37132a 100644
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -433,6 +433,12 @@ int __init dom0_setup_permissions(struct domain *d)
         rc |= ioports_deny_access(d, pmtmr_ioport, pmtmr_ioport + 3);
     /* PCI configuration space (NB. 0xcf8 has special treatment). */
     rc |= ioports_deny_access(d, 0xcfc, 0xcff);
+#ifdef CONFIG_HVM
+    if ( is_hvm_domain(d) )
+        /* HVM debug console IO port. */
+        rc |= ioports_deny_access(d, XEN_HVM_DEBUGCONS_IOPORT,
+                                  XEN_HVM_DEBUGCONS_IOPORT);
+#endif
     /* Command-line I/O ranges. */
     process_dom0_ioports_disable(d);
 
-- 
2.19.1


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