xen: drop support for Xen 4.1 and older.

Xen 4.2 become unsupported upstream in 09/2015 (see
http://wiki.xen.org/wiki/Xen_Release_Features). However as far as the
interfaces provided by the toolstack libraries go 4.2 and 4.3 are
indistinguishable.

Therefore drop support for Xen 4.1 and earlier which removes a whole
pile of compatibility code which makes future work (to use stable
library interfaces provided by upstream) more difficult. In particular
all supported versions now use a pointer as a libxc handle (4.1 and
earlier used an integer, resulting in various shim layers).

Also Xen 4.2 was the first version of Xen to formally support upstream
QEMU (as a preview) so that makes sense as a cut-off now.

This change drops all the configure-y and resulting ifdefs in a mostly
mechanical way. A follow up will refactor wrappers which are now
unused.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

5 files changed, 7 insertions, 267 deletions

diff --git a/configure b/configure
index d4411a1..16c7956 100755
--- a/configure
+++ b/configure
@@ -2111,100 +2111,10 @@ EOF
     xen_ctrl_version=420
     xen=yes
 
-  elif
-      cat > $TMPC <<EOF &&
-#include <xenctrl.h>
-#include <xs.h>
-#include <stdint.h>
-#include <xen/hvm/hvm_info_table.h>
-#if !defined(HVM_MAX_VCPUS)
-# error HVM_MAX_VCPUS not defined
-#endif
-int main(void) {
-  xs_daemon_open();
-  xc_interface_open(0, 0, 0);
-  xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-  xc_gnttab_open(NULL, 0);
-  xc_domain_add_to_physmap(0, 0, XENMAPSPACE_gmfn, 0, 0);
-  return 0;
-}
-EOF
-      compile_prog "" "$xen_libs"
-    then
-    xen_ctrl_version=410
-    xen=yes
-
-  # Xen 4.0.0
-  elif
-      cat > $TMPC <<EOF &&
-#include <xenctrl.h>
-#include <xs.h>
-#include <stdint.h>
-#include <xen/hvm/hvm_info_table.h>
-#if !defined(HVM_MAX_VCPUS)
-# error HVM_MAX_VCPUS not defined
-#endif
-int main(void) {
-  struct xen_add_to_physmap xatp = {
-    .domid = 0, .space = XENMAPSPACE_gmfn, .idx = 0, .gpfn = 0,
-  };
-  xs_daemon_open();
-  xc_interface_open();
-  xc_gnttab_open();
-  xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-  xc_memory_op(0, XENMEM_add_to_physmap, &xatp);
-  return 0;
-}
-EOF
-      compile_prog "" "$xen_libs"
-    then
-    xen_ctrl_version=400
-    xen=yes
-
-  # Xen 3.4.0
-  elif
-      cat > $TMPC <<EOF &&
-#include <xenctrl.h>
-#include <xs.h>
-int main(void) {
-  struct xen_add_to_physmap xatp = {
-    .domid = 0, .space = XENMAPSPACE_gmfn, .idx = 0, .gpfn = 0,
-  };
-  xs_daemon_open();
-  xc_interface_open();
-  xc_gnttab_open();
-  xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-  xc_memory_op(0, XENMEM_add_to_physmap, &xatp);
-  return 0;
-}
-EOF
-      compile_prog "" "$xen_libs"
-    then
-    xen_ctrl_version=340
-    xen=yes
-
-  # Xen 3.3.0
-  elif
-      cat > $TMPC <<EOF &&
-#include <xenctrl.h>
-#include <xs.h>
-int main(void) {
-  xs_daemon_open();
-  xc_interface_open();
-  xc_gnttab_open();
-  xc_hvm_set_mem_type(0, 0, HVMMEM_ram_ro, 0, 0);
-  return 0;
-}
-EOF
-      compile_prog "" "$xen_libs"
-    then
-    xen_ctrl_version=330
-    xen=yes
-
-  # Xen version unsupported
   else
     if test "$xen" = "yes" ; then
-      feature_not_found "xen (unsupported version)" "Install supported xen (e.g. 4.0, 3.4, 3.3)"
+      feature_not_found "xen (unsupported version)" \
+                        "Install a supported xen (xen 4.2 or newer)"
     fi
     xen=no
   fi
@@ -2218,15 +2128,10 @@ EOF
 fi
 
 if test "$xen_pci_passthrough" != "no"; then
-  if test "$xen" = "yes" && test "$linux" = "yes" &&
-    test "$xen_ctrl_version" -ge 340; then
+  if test "$xen" = "yes" && test "$linux" = "yes"; then
     xen_pci_passthrough=yes
   else
     if test "$xen_pci_passthrough" = "yes"; then
-      if test "$xen_ctrl_version" -lt 340; then
-        error_exit "User requested feature Xen PCI Passthrough" \
-            "This feature does not work with Xen 3.3"
-      fi
       error_exit "User requested feature Xen PCI Passthrough" \
           " but this feature requires /sys from Linux"
     fi
diff --git a/hw/i386/xen/xen_apic.c b/hw/i386/xen/xen_apic.c
index 5128146..2b8d709 100644
--- a/hw/i386/xen/xen_apic.c
+++ b/hw/i386/xen/xen_apic.c
@@ -44,11 +44,7 @@ static void xen_apic_realize(DeviceState *dev, Error **errp)
     s->vapic_control = 0;
     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
                           "xen-apic-msi", APIC_SPACE_SIZE);
-
-#if defined(CONFIG_XEN_CTRL_INTERFACE_VERSION) \
-    && CONFIG_XEN_CTRL_INTERFACE_VERSION >= 420
     msi_supported = true;
-#endif
 }
 
 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index c577354..df33481 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -48,8 +48,4 @@ void xen_modified_memory(ram_addr_t start, ram_addr_t length);
 
 void xen_register_framebuffer(struct MemoryRegion *mr);
 
-#if defined(CONFIG_XEN) && CONFIG_XEN_CTRL_INTERFACE_VERSION < 400
-#  define HVM_MAX_VCPUS 32
-#endif
-
 #endif /* QEMU_HW_XEN_H */
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 0d83891..3a5b537 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -16,11 +16,7 @@
 #undef XC_WANT_COMPAT_MAP_FOREIGN_API
 
 #include <xenctrl.h>
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 420
-#  include <xs.h>
-#else
-#  include <xenstore.h>
-#endif
+#include <xenstore.h>
 #include <xen/io/xenbus.h>
 
 #include "hw/hw.h"
@@ -30,129 +26,11 @@
 #include "trace.h"
 
 /*
- * We don't support Xen prior to 3.3.0.
+ * We don't support Xen prior to 4.2.0.
  */
 
-/* Xen before 4.0 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 400
-static inline void *xc_map_foreign_bulk(int xc_handle, uint32_t dom, int prot,
-                                        xen_pfn_t *arr, int *err,
-                                        unsigned int num)
-{
-    return xc_map_foreign_batch(xc_handle, dom, prot, arr, num);
-}
-#endif
-
-
-/* Xen before 4.1 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 410
-
-typedef int XenXC;
-typedef int xenevtchn_handle;
-typedef int xengnttab_handle;
-typedef int xenforeignmemory_handle;
-
-#  define XC_INTERFACE_FMT "%i"
-#  define XC_HANDLER_INITIAL_VALUE    -1
-
-static inline xenevtchn_handle *xenevtchn_open(void *logger,
-                                               unsigned int open_flags)
-{
-    xenevtchn_handle *h = malloc(sizeof(*h));
-    if (!h) {
-        return NULL;
-    }
-    *h = xc_evtchn_open();
-    if (*h == -1) {
-        free(h);
-        h = NULL;
-    }
-    return h;
-}
-static inline int xenevtchn_close(xenevtchn_handle *h)
-{
-    int rc = xc_evtchn_close(*h);
-    free(h);
-    return rc;
-}
-#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_unmask(*h, p)
-
-static inline xengnttab_handle *xengnttab_open(void *logger,
-                                               unsigned int open_flags)
-{
-    xengnttab_handle *h = malloc(sizeof(*h));
-    if (!h) {
-        return NULL;
-    }
-    *h = xc_gnttab_open();
-    if (*h == -1) {
-        free(h);
-        h = NULL;
-    }
-    return h;
-}
-static inline int xengnttab_close(xengnttab_handle *h)
-{
-    int rc = xc_gnttab_close(*h);
-    free(h);
-    return rc;
-}
-#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_map_grant_refs(h, c, d, r, p) \
-    xc_gnttab_map_grant_refs(*h, c, d, r, p)
-#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(*h, a, n)
-
-static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger,
-                                          unsigned int open_flags)
-{
-    return xc_interface_open();
-}
-
-/* See below for xenforeignmemory_* APIs */
-
-static inline int xc_domain_populate_physmap_exact
-    (XenXC xc_handle, uint32_t domid, unsigned long nr_extents,
-     unsigned int extent_order, unsigned int mem_flags, xen_pfn_t *extent_start)
-{
-    return xc_domain_memory_populate_physmap
-        (xc_handle, domid, nr_extents, extent_order, mem_flags, extent_start);
-}
-
-static inline int xc_domain_add_to_physmap(int xc_handle, uint32_t domid,
-                                           unsigned int space, unsigned long idx,
-                                           xen_pfn_t gpfn)
-{
-    struct xen_add_to_physmap xatp = {
-        .domid = domid,
-        .space = space,
-        .idx = idx,
-        .gpfn = gpfn,
-    };
-
-    return xc_memory_op(xc_handle, XENMEM_add_to_physmap, &xatp);
-}
-
-static inline struct xs_handle *xs_open(unsigned long flags)
-{
-    return xs_daemon_open();
-}
-
-static inline void xs_close(struct xs_handle *xsh)
-{
-    if (xsh != NULL) {
-        xs_daemon_close(xsh);
-    }
-}
-
-
-/* Xen 4.1 thru 4.6 */
-#elif CONFIG_XEN_CTRL_INTERFACE_VERSION < 471
+/* Xen 4.2 thru 4.6 */
+#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 471
 
 typedef xc_interface *XenXC;
 typedef xc_interface *xenforeignmemory_handle;
@@ -205,27 +83,11 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger,
 }
 #endif
 
-/* Xen before 4.2 */
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 420
-static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
-        uint64_t addr, uint32_t data)
-{
-    return -ENOSYS;
-}
-/* The followings are only to compile op_discard related code on older
- * Xen releases. */
-#define BLKIF_OP_DISCARD 5
-struct blkif_request_discard {
-    uint64_t nr_sectors;
-    uint64_t sector_number;
-};
-#else
 static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
         uint64_t addr, uint32_t data)
 {
     return xc_hvm_inject_msi(xen_xc, dom, addr, data);
 }
-#endif
 
 void destroy_hvm_domain(bool reboot);
 
diff --git a/xen-hvm.c b/xen-hvm.c
index 6861c51..8350ca2 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -316,7 +316,6 @@ static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr,
     return start_addr;
 }
 
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
 static int xen_add_to_physmap(XenIOState *state,
                               hwaddr start_addr,
                               ram_addr_t size,
@@ -451,24 +450,6 @@ static int xen_remove_from_physmap(XenIOState *state,
     return 0;
 }
 
-#else
-static int xen_add_to_physmap(XenIOState *state,
-                              hwaddr start_addr,
-                              ram_addr_t size,
-                              MemoryRegion *mr,
-                              hwaddr offset_within_region)
-{
-    return -ENOSYS;
-}
-
-static int xen_remove_from_physmap(XenIOState *state,
-                                   hwaddr start_addr,
-                                   ram_addr_t size)
-{
-    return -ENOSYS;
-}
-#endif
-
 static void xen_set_memory(struct MemoryListener *listener,
                            MemoryRegionSection *section,
                            bool add)