1 files changed, 72 insertions, 0 deletions
diff --git a/hw/vfio/pci-quirks.h b/hw/vfio/pci-quirks.h
new file mode 100644
index 0000000000..d1532e379b
--- /dev/null
+++ b/hw/vfio/pci-quirks.h
@@ -0,0 +1,72 @@
+/*
+ * vfio generic region quirks (mostly backdoors to PCI config space)
+ *
+ * Copyright Red Hat, Inc. 2012-2015
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+#ifndef HW_VFIO_VFIO_PCI_QUIRKS_H
+#define HW_VFIO_VFIO_PCI_QUIRKS_H
+
+#include "qemu/osdep.h"
+#include "exec/memop.h"
+
+/*
+ * The generic window quirks operate on an address and data register,
+ * vfio_generic_window_address_quirk handles the address register and
+ * vfio_generic_window_data_quirk handles the data register.  These ops
+ * pass reads and writes through to hardware until a value matching the
+ * stored address match/mask is written.  When this occurs, the data
+ * register access emulated PCI config space for the device rather than
+ * passing through accesses.  This enables devices where PCI config space
+ * is accessible behind a window register to maintain the virtualization
+ * provided through vfio.
+ */
+typedef struct VFIOConfigWindowMatch {
+    uint32_t match;
+    uint32_t mask;
+} VFIOConfigWindowMatch;
+
+typedef struct VFIOConfigWindowQuirk {
+    struct VFIOPCIDevice *vdev;
+
+    uint32_t address_val;
+
+    uint32_t address_offset;
+    uint32_t data_offset;
+
+    bool window_enabled;
+    uint8_t bar;
+
+    MemoryRegion *addr_mem;
+    MemoryRegion *data_mem;
+
+    uint32_t nr_matches;
+    VFIOConfigWindowMatch matches[];
+} VFIOConfigWindowQuirk;
+
+extern const MemoryRegionOps vfio_generic_window_address_quirk;
+extern const MemoryRegionOps vfio_generic_window_data_quirk;
+
+/*
+ * The generic mirror quirk handles devices which expose PCI config space
+ * through a region within a BAR.  When enabled, reads and writes are
+ * redirected through to emulated PCI config space.  XXX if PCI config space
+ * used memory regions, this could just be an alias.
+ */
+typedef struct VFIOConfigMirrorQuirk {
+    struct VFIOPCIDevice *vdev;
+    uint32_t offset; /* Offset in BAR */
+    uint32_t config_offset; /* Offset in PCI config space */
+    uint8_t bar;
+    MemoryRegion *mem;
+    uint8_t data[];
+} VFIOConfigMirrorQuirk;
+
+extern const MemoryRegionOps vfio_generic_mirror_quirk;
+
+#endif /* HW_VFIO_VFIO_PCI_QUIRKS_H */