xen: Drop support for Xen versions below 4.7.1

In restructuring to allow for internal emulation of Xen functionality,
I broke compatibility for Xen 4.6 and earlier. Fix this by explicitly
removing support for anything older than 4.7.1, which is also ancient
but it does still build, and the compatibility support for it is fairly
unintrusive.

Fixes: 15e283c5b684 ("hw/xen: Add foreignmem operations to allow redirection to internal emulation")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-Id: <20230412185102.441523-4-dwmw2@infradead.org>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

1 files changed, 1 insertions, 56 deletions

diff --git a/hw/xen/xen-operations.c b/hw/xen/xen-operations.c
index 3d213d2..e00983e 100644
--- a/hw/xen/xen-operations.c
+++ b/hw/xen/xen-operations.c
@@ -28,46 +28,13 @@
 #include <xenctrl.h>
 
 /*
- * We don't support Xen prior to 4.2.0.
+ * We don't support Xen prior to 4.7.1.
  */
 
-/* Xen 4.2 through 4.6 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
-
-typedef xc_evtchn xenevtchn_handle;
-typedef evtchn_port_or_error_t xenevtchn_port_or_error_t;
-
-#define xenevtchn_open(l, f) xc_evtchn_open(l, f);
-#define xenevtchn_close(h) xc_evtchn_close(h)
-#define xenevtchn_fd(h) xc_evtchn_fd(h)
-#define xenevtchn_pending(h) xc_evtchn_pending(h)
-#define xenevtchn_notify(h, p) xc_evtchn_notify(h, p)
-#define xenevtchn_bind_interdomain(h, d, p) xc_evtchn_bind_interdomain(h, d, p)
-#define xenevtchn_unmask(h, p) xc_evtchn_unmask(h, p)
-#define xenevtchn_unbind(h, p) xc_evtchn_unbind(h, p)
-
-typedef xc_gnttab xengnttab_handle;
-
-#define xengnttab_open(l, f) xc_gnttab_open(l, f)
-#define xengnttab_close(h) xc_gnttab_close(h)
-#define xengnttab_set_max_grants(h, n) xc_gnttab_set_max_grants(h, n)
-#define xengnttab_map_grant_ref(h, d, r, p) xc_gnttab_map_grant_ref(h, d, r, p)
-#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n)
-#define xengnttab_map_grant_refs(h, c, d, r, p) \
-    xc_gnttab_map_grant_refs(h, c, d, r, p)
-#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \
-    xc_gnttab_map_domain_grant_refs(h, c, d, r, p)
-
-typedef xc_interface xenforeignmemory_handle;
-
-#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
-
 #include <xenevtchn.h>
 #include <xengnttab.h>
 #include <xenforeignmemory.h>
 
-#endif
-
 /* Xen before 4.8 */
 
 static int libxengnttab_fallback_grant_copy(xengnttab_handle *xgt,
@@ -223,26 +190,6 @@ static struct gnttab_backend_ops libxengnttab_backend_ops = {
     .unmap = libxengnttab_backend_unmap,
 };
 
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
-
-static void *libxenforeignmem_backend_map(uint32_t dom, void *addr, int prot,
-                                          size_t pages, xfn_pfn_t *pfns,
-                                          int *errs)
-{
-    if (errs) {
-        return xc_map_foreign_bulk(xen_xc, dom, prot, pfns, errs, pages);
-    } else {
-        return xc_map_foreign_pages(xen_xc, dom, prot, pfns, pages);
-    }
-}
-
-static int libxenforeignmem_backend_unmap(void *addr, size_t pages)
-{
-    return munmap(addr, pages * XC_PAGE_SIZE);
-}
-
-#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
-
 static void *libxenforeignmem_backend_map(uint32_t dom, void *addr, int prot,
                                           size_t pages, xen_pfn_t *pfns,
                                           int *errs)
@@ -256,8 +203,6 @@ static int libxenforeignmem_backend_unmap(void *addr, size_t pages)
     return xenforeignmemory_unmap(xen_fmem, addr, pages);
 }
 
-#endif
-
 struct foreignmem_backend_ops libxenforeignmem_backend_ops = {
     .map = libxenforeignmem_backend_map,
     .unmap = libxenforeignmem_backend_unmap,