xen/pass-through: constify some static data

This is done indirectly by adjusting two typedefs and helps emphasizing
that the respective tables aren't supposed to be modified at runtime
(as they may be shared between devices).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

2 files changed, 5 insertions, 6 deletions

diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h
index 4bba559763..232165a7d1 100644
--- a/hw/xen/xen_pt.h
+++ b/hw/xen/xen_pt.h
@@ -31,7 +31,7 @@ void xen_pt_log(const PCIDevice *d, const char *f, ...) GCC_FMT_ATTR(2, 3);
 /* Helper */
 #define XEN_PFN(x) ((x) >> XC_PAGE_SHIFT)
 
-typedef struct XenPTRegInfo XenPTRegInfo;
+typedef const struct XenPTRegInfo XenPTRegInfo;
 typedef struct XenPTReg XenPTReg;
 
 typedef struct XenPCIPassthroughState XenPCIPassthroughState;
@@ -133,11 +133,11 @@ struct XenPTReg {
     uint32_t data; /* emulated value */
 };
 
-typedef struct XenPTRegGroupInfo XenPTRegGroupInfo;
+typedef const struct XenPTRegGroupInfo XenPTRegGroupInfo;
 
 /* emul reg group size initialize method */
 typedef int (*xen_pt_reg_size_init_fn)
-    (XenPCIPassthroughState *, const XenPTRegGroupInfo *,
+    (XenPCIPassthroughState *, XenPTRegGroupInfo *,
      uint32_t base_offset, uint8_t *size);
 
 /* emulated register group information */
@@ -152,7 +152,7 @@ struct XenPTRegGroupInfo {
 /* emul register group management table */
 typedef struct XenPTRegGroup {
     QLIST_ENTRY(XenPTRegGroup) entries;
-    const XenPTRegGroupInfo *reg_grp;
+    XenPTRegGroupInfo *reg_grp;
     uint32_t base_offset;
     uint8_t size;
     QLIST_HEAD(, XenPTReg) reg_tbl_list;
diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index f3730928d7..dd37be38a4 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -96,8 +96,7 @@ XenPTReg *xen_pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address)
 }
 
 static uint32_t get_throughable_mask(const XenPCIPassthroughState *s,
-                                     const XenPTRegInfo *reg,
-                                     uint32_t valid_mask)
+                                     XenPTRegInfo *reg, uint32_t valid_mask)
 {
     uint32_t throughable_mask = ~(reg->emu_mask | reg->ro_mask);