This is needed so Xen can properly trap 4 byte accesses to 0xcf8 in order to
keep consistency with accesses to 0xcfc.
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
Cc: Jan Beulich <jbeul...@suse.com>
Cc: Andrew Cooper <andrew.coop...@citrix.com>
---
Changes since v1:
- Only trap on accesses to 0xcf8.
---
xen/arch/x86/setup.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 3b9aee5..6d44e71 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1535,6 +1535,11 @@ void __hwdom_init setup_io_bitmap(struct domain *d)
rc = rangeset_report_ranges(d->arch.ioport_caps, 0, 0x10000,
io_bitmap_cb, d);
BUG_ON(rc);
+ /*
+ * NB: we need to trap accesses to 0xcf8 in order
+ * to intercept 4 byte accesses.
+ */
+ __set_bit(0xcf8, d->arch.hvm_domain.io_bitmap);
}
}
--
1.9.5 (Apple Git-50.3)
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