[Qemu-devel] [PATCH v2 0/5] Drop support for Xen 4.1 and older from qemu-xen

[Qemu-devel] [PATCH v2 0/5] Drop support for Xen 4.1 and older from qemu-xen

[Ian Campbell]

This is most easily explained by the commit log of the first patch:

    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.

The rest of the patches are just further cleanups which become possible.

[Qemu-devel] [PATCH v2 1/5] xen: drop support for Xen 4.1 and older.

[Ian Campbell]

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>
---
v2: Don't claim to support 4.1 for another 89 years in the commit
      message.
    Tweak message in configure.
---
 configure                   | 101 +-----------------------------
 hw/i386/xen/xen_apic.c      |   4 --
 include/hw/xen/xen.h        |   4 --
 include/hw/xen/xen_common.h | 146 ++------------------------------------------
 xen-hvm.c                   |  19 ------
 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)
-- 
2.1.4

[Qemu-devel] [PATCH v2 2/5] xen: drop xen_xc_hvm_inject_msi wrapper

[Ian Campbell]

The xc version is now always present.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 include/hw/xen/xen_common.h | 6 ------
 xen-hvm.c                   | 2 +-
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 3a5b537..ec3ca56 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -83,12 +83,6 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger,
 }
 #endif
 
-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);
-}
-
 void destroy_hvm_domain(bool reboot);
 
 /* shutdown/destroy current domain because of an error */
diff --git a/xen-hvm.c b/xen-hvm.c
index 8350ca2..918cabc 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -169,7 +169,7 @@ int xen_is_pirq_msi(uint32_t msi_data)
 
 void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
 {
-    xen_xc_hvm_inject_msi(xen_xc, xen_domid, addr, data);
+    xc_hvm_inject_msi(xen_xc, xen_domid, addr, data);
 }
 
 static void xen_suspend_notifier(Notifier *notifier, void *data)
-- 
2.1.4

[Qemu-devel] [PATCH v2 3/5] xen: drop XenXC and associated interface wrappers

[Ian Campbell]

Now that 4.2 and earlier are no longer supported "xc_interface *" is
always the right type for the xc interface handle.

With this we can also simplify the handling of the xenforeignmemory
compatibility wrapper by making xenforeignmemory_handle ==
xc_interface, instead of an xc_interface* and remove various uses of &
and *h.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
v2: Mention xenforeignmemory changes in commit message.
---
 hw/xen/xen_backend.c         |  4 +--
 include/hw/xen/xen_backend.h |  2 +-
 include/hw/xen/xen_common.h  | 82 +++++++++++++++++---------------------------
 xen-common.c                 |  4 +--
 xen-hvm.c                    | 16 ++++-----
 5 files changed, 44 insertions(+), 64 deletions(-)

diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index ef7843f..60575ad 100644
--- a/hw/xen/xen_backend.c
+++ b/hw/xen/xen_backend.c
@@ -36,7 +36,7 @@
 /* ------------------------------------------------------------- */
 
 /* public */
-XenXC xen_xc = XC_HANDLER_INITIAL_VALUE;
+xc_interface *xen_xc = NULL;
 xenforeignmemory_handle *xen_fmem = NULL;
 struct xs_handle *xenstore = NULL;
 const char *xen_protocol;
@@ -710,7 +710,7 @@ int xen_be_init(void)
 
     qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
 
-    if (xen_xc == XC_HANDLER_INITIAL_VALUE || xen_fmem == NULL) {
+    if (xen_xc == NULL || xen_fmem == NULL) {
         /* Check if xen_init() have been called */
         goto err;
     }
diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h
index e0d52ee..c839eeb 100644
--- a/include/hw/xen/xen_backend.h
+++ b/include/hw/xen/xen_backend.h
@@ -56,7 +56,7 @@ struct XenDevice {
 /* ------------------------------------------------------------- */
 
 /* variables */
-extern XenXC xen_xc;
+extern xc_interface *xen_xc;
 extern xenforeignmemory_handle *xen_fmem;
 extern struct xs_handle *xenstore;
 extern const char *xen_protocol;
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index ec3ca56..254ef14 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -32,14 +32,10 @@
 /* Xen 4.2 thru 4.6 */
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 471
 
-typedef xc_interface *XenXC;
-typedef xc_interface *xenforeignmemory_handle;
+typedef xc_interface xenforeignmemory_handle;
 typedef xc_evtchn xenevtchn_handle;
 typedef xc_gnttab xengnttab_handle;
 
-#  define XC_INTERFACE_FMT "%p"
-#  define XC_HANDLER_INITIAL_VALUE    NULL
-
 #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)
@@ -57,30 +53,14 @@ typedef xc_gnttab xengnttab_handle;
 #define xengnttab_map_grant_refs(h, c, d, r, p) \
     xc_gnttab_map_grant_refs(h, c, d, r, p)
 
-static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger,
-                                          unsigned int open_flags)
-{
-    return xc_interface_open(logger, dombuild_logger, open_flags);
-}
-
 /* See below for xenforeignmemory_* APIs */
 
 #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 471 */
 
-typedef xc_interface *XenXC;
-
-#  define XC_INTERFACE_FMT "%p"
-#  define XC_HANDLER_INITIAL_VALUE    NULL
-
 #include <xenevtchn.h>
 #include <xengnttab.h>
 #include <xenforeignmemory.h>
 
-static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger,
-                                          unsigned int open_flags)
-{
-    return xc_interface_open(logger, dombuild_logger, open_flags);
-}
 #endif
 
 void destroy_hvm_domain(bool reboot);
@@ -89,7 +69,7 @@ void destroy_hvm_domain(bool reboot);
 void xen_shutdown_fatal_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 
 #ifdef HVM_PARAM_VMPORT_REGS_PFN
-static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
+static inline int xen_get_vmport_regs_pfn(xc_interface *xc, domid_t dom,
                                           xen_pfn_t *vmport_regs_pfn)
 {
     int rc;
@@ -101,7 +81,7 @@ static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
     return rc;
 }
 #else
-static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
+static inline int xen_get_vmport_regs_pfn(xc_interface *xc, domid_t dom,
                                           xen_pfn_t *vmport_regs_pfn)
 {
     return -ENOSYS;
@@ -128,54 +108,54 @@ static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
 
 typedef uint16_t ioservid_t;
 
-static inline void xen_map_memory_section(XenXC xc, domid_t dom,
+static inline void xen_map_memory_section(xc_interface *xc, domid_t dom,
                                           ioservid_t ioservid,
                                           MemoryRegionSection *section)
 {
 }
 
-static inline void xen_unmap_memory_section(XenXC xc, domid_t dom,
+static inline void xen_unmap_memory_section(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid,
                                             MemoryRegionSection *section)
 {
 }
 
-static inline void xen_map_io_section(XenXC xc, domid_t dom,
+static inline void xen_map_io_section(xc_interface *xc, domid_t dom,
                                       ioservid_t ioservid,
                                       MemoryRegionSection *section)
 {
 }
 
-static inline void xen_unmap_io_section(XenXC xc, domid_t dom,
+static inline void xen_unmap_io_section(xc_interface *xc, domid_t dom,
                                         ioservid_t ioservid,
                                         MemoryRegionSection *section)
 {
 }
 
-static inline void xen_map_pcidev(XenXC xc, domid_t dom,
+static inline void xen_map_pcidev(xc_interface *xc, domid_t dom,
                                   ioservid_t ioservid,
                                   PCIDevice *pci_dev)
 {
 }
 
-static inline void xen_unmap_pcidev(XenXC xc, domid_t dom,
+static inline void xen_unmap_pcidev(xc_interface *xc, domid_t dom,
                                     ioservid_t ioservid,
                                     PCIDevice *pci_dev)
 {
 }
 
-static inline int xen_create_ioreq_server(XenXC xc, domid_t dom,
+static inline int xen_create_ioreq_server(xc_interface *xc, domid_t dom,
                                           ioservid_t *ioservid)
 {
     return 0;
 }
 
-static inline void xen_destroy_ioreq_server(XenXC xc, domid_t dom,
+static inline void xen_destroy_ioreq_server(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid)
 {
 }
 
-static inline int xen_get_ioreq_server_info(XenXC xc, domid_t dom,
+static inline int xen_get_ioreq_server_info(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid,
                                             xen_pfn_t *ioreq_pfn,
                                             xen_pfn_t *bufioreq_pfn,
@@ -212,7 +192,7 @@ static inline int xen_get_ioreq_server_info(XenXC xc, domid_t dom,
     return 0;
 }
 
-static inline int xen_set_ioreq_server_state(XenXC xc, domid_t dom,
+static inline int xen_set_ioreq_server_state(xc_interface *xc, domid_t dom,
                                              ioservid_t ioservid,
                                              bool enable)
 {
@@ -222,7 +202,7 @@ static inline int xen_set_ioreq_server_state(XenXC xc, domid_t dom,
 /* Xen 4.5 */
 #else
 
-static inline void xen_map_memory_section(XenXC xc, domid_t dom,
+static inline void xen_map_memory_section(xc_interface *xc, domid_t dom,
                                           ioservid_t ioservid,
                                           MemoryRegionSection *section)
 {
@@ -235,7 +215,7 @@ static inline void xen_map_memory_section(XenXC xc, domid_t dom,
                                         start_addr, end_addr);
 }
 
-static inline void xen_unmap_memory_section(XenXC xc, domid_t dom,
+static inline void xen_unmap_memory_section(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid,
                                             MemoryRegionSection *section)
 {
@@ -248,7 +228,7 @@ static inline void xen_unmap_memory_section(XenXC xc, domid_t dom,
                                             start_addr, end_addr);
 }
 
-static inline void xen_map_io_section(XenXC xc, domid_t dom,
+static inline void xen_map_io_section(xc_interface *xc, domid_t dom,
                                       ioservid_t ioservid,
                                       MemoryRegionSection *section)
 {
@@ -261,7 +241,7 @@ static inline void xen_map_io_section(XenXC xc, domid_t dom,
                                         start_addr, end_addr);
 }
 
-static inline void xen_unmap_io_section(XenXC xc, domid_t dom,
+static inline void xen_unmap_io_section(xc_interface *xc, domid_t dom,
                                         ioservid_t ioservid,
                                         MemoryRegionSection *section)
 {
@@ -274,7 +254,7 @@ static inline void xen_unmap_io_section(XenXC xc, domid_t dom,
                                             start_addr, end_addr);
 }
 
-static inline void xen_map_pcidev(XenXC xc, domid_t dom,
+static inline void xen_map_pcidev(xc_interface *xc, domid_t dom,
                                   ioservid_t ioservid,
                                   PCIDevice *pci_dev)
 {
@@ -286,7 +266,7 @@ static inline void xen_map_pcidev(XenXC xc, domid_t dom,
                                       PCI_FUNC(pci_dev->devfn));
 }
 
-static inline void xen_unmap_pcidev(XenXC xc, domid_t dom,
+static inline void xen_unmap_pcidev(xc_interface *xc, domid_t dom,
                                     ioservid_t ioservid,
                                     PCIDevice *pci_dev)
 {
@@ -298,7 +278,7 @@ static inline void xen_unmap_pcidev(XenXC xc, domid_t dom,
                                           PCI_FUNC(pci_dev->devfn));
 }
 
-static inline int xen_create_ioreq_server(XenXC xc, domid_t dom,
+static inline int xen_create_ioreq_server(xc_interface *xc, domid_t dom,
                                           ioservid_t *ioservid)
 {
     int rc = xc_hvm_create_ioreq_server(xc, dom, HVM_IOREQSRV_BUFIOREQ_ATOMIC,
@@ -311,14 +291,14 @@ static inline int xen_create_ioreq_server(XenXC xc, domid_t dom,
     return rc;
 }
 
-static inline void xen_destroy_ioreq_server(XenXC xc, domid_t dom,
+static inline void xen_destroy_ioreq_server(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid)
 {
     trace_xen_ioreq_server_destroy(ioservid);
     xc_hvm_destroy_ioreq_server(xc, dom, ioservid);
 }
 
-static inline int xen_get_ioreq_server_info(XenXC xc, domid_t dom,
+static inline int xen_get_ioreq_server_info(xc_interface *xc, domid_t dom,
                                             ioservid_t ioservid,
                                             xen_pfn_t *ioreq_pfn,
                                             xen_pfn_t *bufioreq_pfn,
@@ -329,7 +309,7 @@ static inline int xen_get_ioreq_server_info(XenXC xc, domid_t dom,
                                         bufioreq_evtchn);
 }
 
-static inline int xen_set_ioreq_server_state(XenXC xc, domid_t dom,
+static inline int xen_set_ioreq_server_state(xc_interface *xc, domid_t dom,
                                              ioservid_t ioservid,
                                              bool enable)
 {
@@ -340,7 +320,7 @@ static inline int xen_set_ioreq_server_state(XenXC xc, domid_t dom,
 #endif
 
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 460
-static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
+static inline int xen_xc_domain_add_to_physmap(xc_interface *xch, uint32_t domid,
                                                unsigned int space,
                                                unsigned long idx,
                                                xen_pfn_t gpfn)
@@ -348,7 +328,7 @@ static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
     return xc_domain_add_to_physmap(xch, domid, space, idx, gpfn);
 }
 #else
-static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
+static inline int xen_xc_domain_add_to_physmap(xc_interface *xch, uint32_t domid,
                                                unsigned int space,
                                                unsigned long idx,
                                                xen_pfn_t gpfn)
@@ -363,14 +343,14 @@ static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
 
 #ifdef CONFIG_XEN_PV_DOMAIN_BUILD
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 470
-static inline int xen_domain_create(XenXC xc, uint32_t ssidref,
+static inline int xen_domain_create(xc_interface *xc, uint32_t ssidref,
                                     xen_domain_handle_t handle, uint32_t flags,
                                     uint32_t *pdomid)
 {
     return xc_domain_create(xc, ssidref, handle, flags, pdomid);
 }
 #else
-static inline int xen_domain_create(XenXC xc, uint32_t ssidref,
+static inline int xen_domain_create(xc_interface *xc, uint32_t ssidref,
                                     xen_domain_handle_t handle, uint32_t flags,
                                     uint32_t *pdomid)
 {
@@ -381,17 +361,17 @@ static inline int xen_domain_create(XenXC xc, uint32_t ssidref,
 
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 471
 
-#define xenforeignmemory_open(l, f) &xen_xc
+#define xenforeignmemory_open(l, f) xen_xc
 
-static inline void *xenforeignmemory_map(XenXC *h, uint32_t dom,
+static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom,
                                          int prot, size_t pages,
                                          const xen_pfn_t arr[/*pages*/],
                                          int err[/*pages*/])
 {
     if (err)
-        return xc_map_foreign_bulk(*h, dom, prot, arr, err, pages);
+        return xc_map_foreign_bulk(h, dom, prot, arr, err, pages);
     else
-        return xc_map_foreign_pages(*h, dom, prot, arr, pages);
+        return xc_map_foreign_pages(h, dom, prot, arr, pages);
 }
 
 #define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE)
diff --git a/xen-common.c b/xen-common.c
index 4860b2e..e641ad1 100644
--- a/xen-common.c
+++ b/xen-common.c
@@ -114,8 +114,8 @@ static void xen_change_state_handler(void *opaque, int running,
 
 static int xen_init(MachineState *ms)
 {
-    xen_xc = xen_xc_interface_open(0, 0, 0);
-    if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
+    xen_xc = xc_interface_open(0, 0, 0);
+    if (xen_xc == NULL) {
         xen_be_printf(NULL, 0, "can't open xen interface\n");
         return -1;
     }
diff --git a/xen-hvm.c b/xen-hvm.c
index 918cabc..fbe0e3a 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -1224,7 +1224,7 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
                                    &ioreq_pfn, &bufioreq_pfn,
                                    &bufioreq_evtchn);
     if (rc < 0) {
-        error_report("failed to get ioreq server info: error %d handle=" XC_INTERFACE_FMT,
+        error_report("failed to get ioreq server info: error %d handle=%p",
                      errno, xen_xc);
         goto err;
     }
@@ -1237,7 +1237,7 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
                                               PROT_READ|PROT_WRITE,
                                               1, &ioreq_pfn, NULL);
     if (state->shared_page == NULL) {
-        error_report("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
+        error_report("map shared IO page returned error %d handle=%p",
                      errno, xen_xc);
         goto err;
     }
@@ -1249,8 +1249,8 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
             xenforeignmemory_map(xen_fmem, xen_domid, PROT_READ|PROT_WRITE,
                                  1, &ioreq_pfn, NULL);
         if (state->shared_vmport_page == NULL) {
-            error_report("map shared vmport IO page returned error %d handle="
-                         XC_INTERFACE_FMT, errno, xen_xc);
+            error_report("map shared vmport IO page returned error %d handle=%p",
+                         errno, xen_xc);
             goto err;
         }
     } else if (rc != -ENOSYS) {
@@ -1272,7 +1272,7 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
 
     rc = xen_set_ioreq_server_state(xen_xc, xen_domid, state->ioservid, true);
     if (rc < 0) {
-        error_report("failed to enable ioreq server info: error %d handle=" XC_INTERFACE_FMT,
+        error_report("failed to enable ioreq server info: error %d handle=%p",
                      errno, xen_xc);
         goto err;
     }
@@ -1333,11 +1333,11 @@ err:
 
 void destroy_hvm_domain(bool reboot)
 {
-    XenXC xc_handle;
+    xc_interface *xc_handle;
     int sts;
 
-    xc_handle = xen_xc_interface_open(0, 0, 0);
-    if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
+    xc_handle = xc_interface_open(0, 0, 0);
+    if (xc_handle == NULL) {
         fprintf(stderr, "Cannot acquire xenctrl handle\n");
     } else {
         sts = xc_domain_shutdown(xc_handle, xen_domid,
-- 
2.1.4

[Qemu-devel] [PATCH v2 4/5] xen: move xenforeignmemory compat layer into common place

[Ian Campbell]

Now that we no longer support Xen 4.2 and earlier only the <470 case
needs this so it can live with all the others.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 include/hw/xen/xen_common.h | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 254ef14..7a3cce0 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -53,7 +53,20 @@ typedef xc_gnttab xengnttab_handle;
 #define xengnttab_map_grant_refs(h, c, d, r, p) \
     xc_gnttab_map_grant_refs(h, c, d, r, p)
 
-/* See below for xenforeignmemory_* APIs */
+#define xenforeignmemory_open(l, f) xen_xc
+
+static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom,
+                                         int prot, size_t pages,
+                                         const xen_pfn_t arr[/*pages*/],
+                                         int err[/*pages*/])
+{
+    if (err)
+        return xc_map_foreign_bulk(h, dom, prot, arr, err, pages);
+    else
+        return xc_map_foreign_pages(h, dom, prot, arr, pages);
+}
+
+#define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE)
 
 #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 471 */
 
@@ -359,23 +372,4 @@ static inline int xen_domain_create(xc_interface *xc, uint32_t ssidref,
 #endif
 #endif
 
-#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 471
-
-#define xenforeignmemory_open(l, f) xen_xc
-
-static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom,
-                                         int prot, size_t pages,
-                                         const xen_pfn_t arr[/*pages*/],
-                                         int err[/*pages*/])
-{
-    if (err)
-        return xc_map_foreign_bulk(h, dom, prot, arr, err, pages);
-    else
-        return xc_map_foreign_pages(h, dom, prot, arr, pages);
-}
-
-#define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE)
-
-#endif
-
 #endif /* QEMU_HW_XEN_COMMON_H */
-- 
2.1.4

[Qemu-devel] [PATCH v2 5/5] xen: Drop __XEN_LATEST_INTERFACE_VERSION__ checks from prior to Xen 4.2

[Ian Campbell]

We assume (and check for in configure) 4.2 or later now. In reality
all of the removed checks are for far older versions.

FMT_ioreq_size is no longer needed.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
v2: Drop FMT_ioreq_size too
---
 hw/display/xenfb.c |  7 -------
 xen-hvm.c          | 19 ++-----------------
 2 files changed, 2 insertions(+), 24 deletions(-)

diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
index a533c3d..40b096a 100644
--- a/hw/display/xenfb.c
+++ b/hw/display/xenfb.c
@@ -241,9 +241,7 @@ static int xenfb_send_motion(struct XenInput *xenfb,
     event.type = XENKBD_TYPE_MOTION;
     event.motion.rel_x = rel_x;
     event.motion.rel_y = rel_y;
-#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030207
     event.motion.rel_z = rel_z;
-#endif
 
     return xenfb_kbd_event(xenfb, &event);
 }
@@ -258,12 +256,7 @@ static int xenfb_send_position(struct XenInput *xenfb,
     event.type = XENKBD_TYPE_POS;
     event.pos.abs_x = abs_x;
     event.pos.abs_y = abs_y;
-#if __XEN_LATEST_INTERFACE_VERSION__ == 0x00030207
-    event.pos.abs_z = z;
-#endif
-#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030208
     event.pos.rel_z = z;
-#endif
 
     return xenfb_kbd_event(xenfb, &event);
 }
diff --git a/xen-hvm.c b/xen-hvm.c
index fbe0e3a..039680a 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -67,17 +67,6 @@ struct shared_vmport_iopage {
 typedef struct shared_vmport_iopage shared_vmport_iopage_t;
 #endif
 
-#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
-static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
-{
-    return shared_page->vcpu_iodata[i].vp_eport;
-}
-static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
-{
-    return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
-}
-#  define FMT_ioreq_size PRIx64
-#else
 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
 {
     return shared_page->vcpu_ioreq[i].vp_eport;
@@ -86,8 +75,6 @@ static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
 {
     return &shared_page->vcpu_ioreq[vcpu];
 }
-#  define FMT_ioreq_size "u"
-#endif
 
 #define BUFFER_IO_MAX_DELAY  100
 
@@ -688,7 +675,7 @@ static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
     if (req->state != STATE_IOREQ_READY) {
         DPRINTF("I/O request not ready: "
                 "%x, ptr: %x, port: %"PRIx64", "
-                "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
+                "data: %"PRIx64", count: %u, size: %u\n",
                 req->state, req->data_is_ptr, req->addr,
                 req->data, req->count, req->size);
         return NULL;
@@ -1050,9 +1037,7 @@ static void cpu_handle_ioreq(void *opaque)
         if (req->state != STATE_IOREQ_INPROCESS) {
             fprintf(stderr, "Badness in I/O request ... not in service?!: "
                     "%x, ptr: %x, port: %"PRIx64", "
-                    "data: %"PRIx64", count: %" FMT_ioreq_size
-                    ", size: %" FMT_ioreq_size
-                    ", type: %"FMT_ioreq_size"\n",
+                    "data: %"PRIx64", count: %u, size: %u, type: %u\n",
                     req->state, req->data_is_ptr, req->addr,
                     req->data, req->count, req->size, req->type);
             destroy_hvm_domain(false);
-- 
2.1.4

Re: [Qemu-devel] [PATCH v2 1/5] xen: drop support for Xen 4.1 and older.

[Stefano Stabellini]

On Wed, 10 Feb 2016, Ian Campbell wrote:
> 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>


> v2: Don't claim to support 4.1 for another 89 years in the commit
>       message.
>     Tweak message in configure.
> ---
>  configure                   | 101 +-----------------------------
>  hw/i386/xen/xen_apic.c      |   4 --
>  include/hw/xen/xen.h        |   4 --
>  include/hw/xen/xen_common.h | 146 ++------------------------------------------
>  xen-hvm.c                   |  19 ------
>  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)
> -- 
> 2.1.4
> 

Re: [Qemu-devel] [PATCH v2 5/5] xen: Drop __XEN_LATEST_INTERFACE_VERSION__ checks from prior to Xen 4.2

[Stefano Stabellini]

On Wed, 10 Feb 2016, Ian Campbell wrote:
> We assume (and check for in configure) 4.2 or later now. In reality
> all of the removed checks are for far older versions.
> 
> FMT_ioreq_size is no longer needed.
> 
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


> v2: Drop FMT_ioreq_size too
> ---
>  hw/display/xenfb.c |  7 -------
>  xen-hvm.c          | 19 ++-----------------
>  2 files changed, 2 insertions(+), 24 deletions(-)
> 
> diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
> index a533c3d..40b096a 100644
> --- a/hw/display/xenfb.c
> +++ b/hw/display/xenfb.c
> @@ -241,9 +241,7 @@ static int xenfb_send_motion(struct XenInput *xenfb,
>      event.type = XENKBD_TYPE_MOTION;
>      event.motion.rel_x = rel_x;
>      event.motion.rel_y = rel_y;
> -#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030207
>      event.motion.rel_z = rel_z;
> -#endif
>  
>      return xenfb_kbd_event(xenfb, &event);
>  }
> @@ -258,12 +256,7 @@ static int xenfb_send_position(struct XenInput *xenfb,
>      event.type = XENKBD_TYPE_POS;
>      event.pos.abs_x = abs_x;
>      event.pos.abs_y = abs_y;
> -#if __XEN_LATEST_INTERFACE_VERSION__ == 0x00030207
> -    event.pos.abs_z = z;
> -#endif
> -#if __XEN_LATEST_INTERFACE_VERSION__ >= 0x00030208
>      event.pos.rel_z = z;
> -#endif
>  
>      return xenfb_kbd_event(xenfb, &event);
>  }
> diff --git a/xen-hvm.c b/xen-hvm.c
> index fbe0e3a..039680a 100644
> --- a/xen-hvm.c
> +++ b/xen-hvm.c
> @@ -67,17 +67,6 @@ struct shared_vmport_iopage {
>  typedef struct shared_vmport_iopage shared_vmport_iopage_t;
>  #endif
>  
> -#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
> -static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
> -{
> -    return shared_page->vcpu_iodata[i].vp_eport;
> -}
> -static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
> -{
> -    return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
> -}
> -#  define FMT_ioreq_size PRIx64
> -#else
>  static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
>  {
>      return shared_page->vcpu_ioreq[i].vp_eport;
> @@ -86,8 +75,6 @@ static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
>  {
>      return &shared_page->vcpu_ioreq[vcpu];
>  }
> -#  define FMT_ioreq_size "u"
> -#endif
>  
>  #define BUFFER_IO_MAX_DELAY  100
>  
> @@ -688,7 +675,7 @@ static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
>      if (req->state != STATE_IOREQ_READY) {
>          DPRINTF("I/O request not ready: "
>                  "%x, ptr: %x, port: %"PRIx64", "
> -                "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
> +                "data: %"PRIx64", count: %u, size: %u\n",
>                  req->state, req->data_is_ptr, req->addr,
>                  req->data, req->count, req->size);
>          return NULL;
> @@ -1050,9 +1037,7 @@ static void cpu_handle_ioreq(void *opaque)
>          if (req->state != STATE_IOREQ_INPROCESS) {
>              fprintf(stderr, "Badness in I/O request ... not in service?!: "
>                      "%x, ptr: %x, port: %"PRIx64", "
> -                    "data: %"PRIx64", count: %" FMT_ioreq_size
> -                    ", size: %" FMT_ioreq_size
> -                    ", type: %"FMT_ioreq_size"\n",
> +                    "data: %"PRIx64", count: %u, size: %u, type: %u\n",
>                      req->state, req->data_is_ptr, req->addr,
>                      req->data, req->count, req->size, req->type);
>              destroy_hvm_domain(false);
> -- 
> 2.1.4
> 

Re: [Qemu-devel] [PATCH v2 0/5] Drop support for Xen 4.1 and older from qemu-xen

[Stefano Stabellini]

[-- Attachment #1: Type: text/plain, Size: 1037 bytes --]

On Wed, 10 Feb 2016, Ian Campbell wrote:
> This is most easily explained by the commit log of the first patch:
> 
>     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.
> 
> The rest of the patches are just further cleanups which become possible.

I committed this series to my "next" branch.