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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/7] xen: groundwork for xen support
- 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
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