WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH 1/7] xen: groundwork for xen support

To: qemu-devel@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 1/7] xen: groundwork for xen support
From: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date: Mon, 4 Aug 2008 17:50:39 +0200
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Delivery-date: Mon, 04 Aug 2008 08:57:30 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1217865045-10722-1-git-send-email-kraxel@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1217865045-10722-1-git-send-email-kraxel@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
- configure script and build system changes.
- wind up new machine type.
- add -domid command line option.
- allow xenpv machines run without disk and kernel specified
  by adding a nodisk_ok field to QEMUMachine.
- detect xen being present.

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
 Makefile.target       |    8 +++
 configure             |   27 +++++++++
 hw/boards.h           |    4 +
 hw/xen-machine.c      |  146 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/xen.h              |   18 ++++++
 target-i386/machine.c |    3 +
 vl.c                  |   19 ++++++-
 7 files changed, 223 insertions(+), 2 deletions(-)
 create mode 100644 hw/xen-machine.c
 create mode 100644 hw/xen.h

diff --git a/Makefile.target b/Makefile.target
index 42162c3..7edef6c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -515,6 +515,14 @@ CPPFLAGS += $(CONFIG_VNC_TLS_CFLAGS)
 LIBS += $(CONFIG_VNC_TLS_LIBS)
 endif
 
+# xen backend driver support
+XEN_OBJS := xen-machine.o
+ifeq ($(CONFIG_XEN), yes)
+  OBJS += $(XEN_OBJS)
+  LIBS += $(XEN_LIBS)
+  $(XEN_OBJS) : CFLAGS += -Wall -Wmissing-prototypes -Wstrict-prototypes
+endif
+
 # SCSI layer
 OBJS+= lsi53c895a.o esp.o
 
diff --git a/configure b/configure
index 0a3b7c9..5111b73 100755
--- a/configure
+++ b/configure
@@ -108,6 +108,7 @@ uname_release=""
 curses="yes"
 nptl="yes"
 mixemu="no"
+xen="no"
 
 # OS specific
 targetos=`uname -s`
@@ -202,6 +203,7 @@ linux="yes"
 linux_user="yes"
 if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
     kqemu="yes"
+    xen="yes"
     audio_possible_drivers="$audio_possible_drivers fmod"
 fi
 ;;
@@ -285,6 +287,8 @@ for opt do
   ;;
   --disable-kqemu) kqemu="no"
   ;;
+  --disable-xen) xen="no"
+  ;;
   --disable-brlapi) brlapi="no"
   ;;
   --enable-profiler) profiler="yes"
@@ -421,6 +425,7 @@ echo "                           Available drivers: 
$audio_possible_drivers"
 echo "  --audio-card-list=LIST   set list of additional emulated audio cards"
 echo "                           Available cards: ac97 adlib cs4231a gus"
 echo "  --enable-mixemu          enable mixer emulation"
+echo "  --disable-xen            disable xen backend driver support"
 echo "  --disable-brlapi         disable BrlAPI"
 echo "  --disable-vnc-tls        disable TLS encryption for VNC server"
 echo "  --disable-curses         disable curses output"
@@ -681,6 +686,22 @@ else
 fi
 
 ##########################################
+# xen probe
+
+if test "$xen" = "yes" ; then
+cat > $TMPC <<EOF
+#include <xs.h>
+#include <xenctrl.h>
+int main(void) { xs_daemon_open; xc_interface_open; }
+EOF
+   if $cc $ARCH_CFLAGS -c -o $TMPO $TMPC -lxenstore -lxenctrl 2> /dev/null ; 
then
+      :
+   else
+      xen="no"
+   fi
+fi
+
+##########################################
 # SDL probe
 
 sdl_too_old=no
@@ -917,6 +938,7 @@ if test -n "$sparc_cpu"; then
     echo "Target Sparc Arch $sparc_cpu"
 fi
 echo "kqemu support     $kqemu"
+echo "xen support       $xen"
 echo "brlapi support    $brlapi"
 echo "Documentation     $build_docs"
 [ ! -z "$uname_release" ] && \
@@ -1168,6 +1190,11 @@ if test "$brlapi" = "yes" ; then
   echo "#define CONFIG_BRLAPI 1" >> $config_h
   echo "BRLAPI_LIBS=-lbrlapi" >> $config_mak
 fi
+if test "$xen" = "yes" ; then
+  echo "CONFIG_XEN=yes" >> $config_mak
+  echo "#define CONFIG_XEN 1" >> $config_h
+  echo "XEN_LIBS=-lxenstore -lxenctrl" >> $config_mak
+fi
 
 # XXX: suppress that
 if [ "$bsd" = "yes" ] ; then
diff --git a/hw/boards.h b/hw/boards.h
index 22ac332..9af9939 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -16,6 +16,7 @@ typedef struct QEMUMachine {
     QEMUMachineInitFunc *init;
 #define RAMSIZE_FIXED  (1 << 0)
     ram_addr_t ram_require;
+    int nodisk_ok;
     struct QEMUMachine *next;
 } QEMUMachine;
 
@@ -29,6 +30,9 @@ extern QEMUMachine bareetraxfs_machine;
 extern QEMUMachine pc_machine;
 extern QEMUMachine isapc_machine;
 
+/* xen_machine.c */
+extern QEMUMachine xenpv_machine;
+
 /* ppc.c */
 extern QEMUMachine prep_machine;
 extern QEMUMachine core99_machine;
diff --git a/hw/xen-machine.c b/hw/xen-machine.c
new file mode 100644
index 0000000..7757bde
--- /dev/null
+++ b/hw/xen-machine.c
@@ -0,0 +1,146 @@
+/*
+ * QEMU Xen PV Machine
+ *
+ * Copyright (c) 2007,08 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw.h"
+#include "boards.h"
+
+#include <xenctrl.h>
+
+/* -------------------------------------------------------------------- */
+/* variables                                                            */
+
+int xen_domid;
+int xen_present = -1;
+int xen_emulate;
+int xen_domainbuild;
+
+/* -------------------------------------------------------------------- */
+/* initialization code                                                  */
+
+/*
+ * Figure the environment we are running in.
+ * Returns true when xen is present, false otherwise.
+ * Also checks whenever the domain specified via -domid
+ * exists (so we can attach) or whenever it must be created.
+ */
+int xen_detect(void)
+{
+    struct xc_dominfo info;
+    int xc, rc;
+
+    if (-1 != xen_present)
+        goto out;
+
+    /* running on xen? (priviledged domain) */
+    xen_present = 0;
+    xc = xc_interface_open();
+    if (-1 == xc)
+        goto out;
+    xen_present = 1;
+
+    /* does the domain exist?  Or should we create one? */
+    rc = xc_domain_getinfo(xc, xen_domid, 1, &info);
+    if ((1 != rc) || (info.domid != xen_domid))
+        xen_domainbuild = 1;
+    close(xc);
+
+out:
+    return xen_present;
+}
+
+static int xen_init(void)
+{
+    if (!xen_domid) {
+       fprintf(stderr, "%s: no domid specified\n", __FUNCTION__);
+       return -1;
+    }
+
+    if (!xen_detect()) {
+        fprintf(stderr, "%s: emulating Xen\n", __FUNCTION__);
+        xen_emulate = 1;
+    }
+
+    return 0;
+}
+
+static int xen_init_pv(DisplayState *ds)
+{
+    int rc;
+
+    rc = xen_init();
+    if (rc < 0)
+        return rc;
+
+    return 0;
+}
+
+/* -------------------------------------------------------------------- */
+/* paravirtualized xen machine                                          */
+
+static void xenpv_init(ram_addr_t ram_size, int vga_ram_size,
+                      const char *boot_device, DisplayState *ds,
+                      const char *kernel_filename,
+                      const char *kernel_cmdline,
+                      const char *initrd_filename,
+                      const char *cpu_model)
+{
+    CPUState *env;
+    int rc;
+
+    rc = xen_init_pv(ds);
+    if (-1 == rc)
+        goto err;
+
+    if (xen_emulate) {
+        fprintf(stderr, "xen pv emulation not implemented yet\n");
+        goto err;
+    }
+    if (xen_domainbuild) {
+        fprintf(stderr, "xen pv domain creation not implemented yet\n");
+        goto err;
+    }
+
+    /* create dummy cpu, halted */
+    if (cpu_model == NULL) {
+#ifdef TARGET_X86_64
+        cpu_model = "qemu64";
+#else
+        cpu_model = "qemu32";
+#endif
+    }
+    env = cpu_init(cpu_model);
+    env->halted = 1;
+
+    return;
+
+err:
+    exit(1);
+}
+
+QEMUMachine xenpv_machine = {
+    .name = "xenpv",
+    .desc = "paravirtualized Xen machine",
+    .init = xenpv_init,
+    .nodisk_ok = 1,
+};
diff --git a/hw/xen.h b/hw/xen.h
new file mode 100644
index 0000000..a772aad
--- /dev/null
+++ b/hw/xen.h
@@ -0,0 +1,18 @@
+#ifndef QEMU_XEN_H
+#define QEMU_XEN_H 1
+/*
+ * public xen header
+ *   stuff needed outside xen-*.c, i.e. interfaces to qemu.
+ *   must not depend on any xen headers being present in
+ *   /usr/include/xen, so it can be included unconditionally.
+ */
+
+/* xen-machine.c */
+extern int xen_domid;
+extern int xen_present;
+extern int xen_emulate;
+extern int xen_domainbuild;
+
+int xen_detect(void);
+
+#endif /* QEMU_XEN_H */
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 91dbd55..98ece17 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -9,6 +9,9 @@ void register_machines(void)
 {
     qemu_register_machine(&pc_machine);
     qemu_register_machine(&isapc_machine);
+#ifdef CONFIG_XEN
+    qemu_register_machine(&xenpv_machine);
+#endif
 }
 
 static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)
diff --git a/vl.c b/vl.c
index e929370..c3f2185 100644
--- a/vl.c
+++ b/vl.c
@@ -29,6 +29,7 @@
 #include "hw/audiodev.h"
 #include "hw/isa.h"
 #include "hw/baum.h"
+#include "hw/xen.h"
 #include "net.h"
 #include "console.h"
 #include "sysemu.h"
@@ -7744,6 +7745,9 @@ static void help(int exitcode)
            "-startdate      select initial date of the clock\n"
            "-icount [N|auto]\n"
            "                Enable virtual instruction counter with 2^N clock 
ticks per instruction\n"
+#ifdef CONFIG_XEN
+           "-domid          specify xen guest domain id\n"
+#endif
            "\n"
            "During emulation, the following keys are useful:\n"
            "ctrl-alt-f      toggle full screen\n"
@@ -7849,6 +7853,9 @@ enum {
     QEMU_OPTION_startdate,
     QEMU_OPTION_tb_size,
     QEMU_OPTION_icount,
+#ifdef CONFIG_XEN
+    QEMU_OPTION_domid,
+#endif
 };
 
 typedef struct QEMUOption {
@@ -7937,6 +7944,9 @@ const QEMUOption qemu_options[] = {
 #ifdef CONFIG_CURSES
     { "curses", 0, QEMU_OPTION_curses },
 #endif
+#ifdef CONFIG_XEN
+    { "domid", HAS_ARG, QEMU_OPTION_domid },
+#endif
 
     /* temporary options */
     { "usb", 0, QEMU_OPTION_usb },
@@ -8784,6 +8794,11 @@ int main(int argc, char **argv)
                     icount_time_shift = strtol(optarg, NULL, 0);
                 }
                 break;
+#ifdef CONFIG_XEN
+            case QEMU_OPTION_domid:
+                xen_domid = atoi(optarg);
+                break;
+#endif
             }
         }
     }
@@ -8858,9 +8873,9 @@ int main(int argc, char **argv)
     linux_boot = (kernel_filename != NULL);
     net_boot = (boot_devices_bitmap >> ('n' - 'a')) & 0xF;
 
-    /* XXX: this should not be: some embedded targets just have flash */
+    /* need a disk for this machine to boot ? */
     if (!linux_boot && net_boot == 0 &&
-        nb_drives_opt == 0)
+        !machine->nodisk_ok && nb_drives_opt == 0)
         help(1);
 
     if (!linux_boot && *kernel_cmdline != '\0') {
-- 
1.5.5.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>