[Qemu-devel] [PULL 0/5] Xen patch queue 2011-07-23

[Qemu-devel] [PULL 0/5] Xen patch queue 2011-07-23

[Alexander Graf]

Hi Anthony,

This is a rebase of the last xen-next pull request, this time without the
xen-mapcache build breakage fix, as that's been fixed meanwhile.

Please pull.

Alex

The following changes since commit 1167bfd63d983eaa4816ee0edb185f98ff070d6d:
  Anthony Liguori (1):
        Open 1.0 development branch.

are available in the git repository at:

  git://repo.or.cz/qemu/agraf.git xen-next

Alexander Graf (2):
      xen: remove CONFIG_XEN_MAPCACHE
      xen: make xen_enabled even more clever

Anthony PERARD (3):
      xen: introduce xen_change_state_handler
      xen: Fix xen_enabled().
      exec.c: Use ram_addr_t in cpu_physical_memory_rw(...).

 configure |    8 +++++---
 exec.c    |    4 ++--
 hw/xen.h  |    2 +-
 xen-all.c |   25 ++++++++++++++++++-------
 4 files changed, 26 insertions(+), 13 deletions(-)

[Qemu-devel] [PATCH 1/5] xen: introduce xen_change_state_handler

[Alexander Graf]

From: Anthony PERARD <anthony.perard@citrix.com>

Remove the call to xenstore_record_dm_state from xen_main_loop_prepare
that is HVM specific.
Add a new vm_change_state_handler shared between xen_pv and xen_hvm
machines to record the VM state to xenstore.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 xen-all.c |   25 ++++++++++++++++++-------
 1 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index 167bed6..83c5476 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -797,12 +797,17 @@ void xenstore_store_pv_console_info(int i, CharDriverState *chr)
     }
 }
 
-static void xenstore_record_dm_state(XenIOState *s, const char *state)
+static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
 {
     char path[50];
 
+    if (xs == NULL) {
+        fprintf(stderr, "xenstore connection not initialized\n");
+        exit(1);
+    }
+
     snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
-    if (!xs_write(s->xenstore, XBT_NULL, path, state, strlen(state))) {
+    if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
         fprintf(stderr, "error recording dm state\n");
         exit(1);
     }
@@ -823,15 +828,20 @@ static void xen_main_loop_prepare(XenIOState *state)
     if (evtchn_fd != -1) {
         qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
     }
-
-    /* record state running */
-    xenstore_record_dm_state(state, "running");
 }
 
 
 /* Initialise Xen */
 
-static void xen_vm_change_state_handler(void *opaque, int running, int reason)
+static void xen_change_state_handler(void *opaque, int running, int reason)
+{
+    if (running) {
+        /* record state running */
+        xenstore_record_dm_state(xenstore, "running");
+    }
+}
+
+static void xen_hvm_change_state_handler(void *opaque, int running, int reason)
 {
     XenIOState *state = opaque;
     if (running) {
@@ -854,6 +864,7 @@ int xen_init(void)
         xen_be_printf(NULL, 0, "can't open xen interface\n");
         return -1;
     }
+    qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 
     return 0;
 }
@@ -915,7 +926,7 @@ int xen_hvm_init(void)
     xen_map_cache_init();
     xen_ram_init(ram_size);
 
-    qemu_add_vm_change_state_handler(xen_vm_change_state_handler, state);
+    qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
 
     state->client = xen_cpu_phys_memory_client;
     QLIST_INIT(&state->physmap);
-- 
1.6.0.2

[Qemu-devel] [PATCH 2/5] xen: Fix xen_enabled().

[Alexander Graf]

From: Anthony PERARD <anthony.perard@citrix.com>

Use the "host" CONFIG_ define instead of the "target" one.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 hw/xen.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/xen.h b/hw/xen.h
index e432705..43b95d6 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -24,7 +24,7 @@ extern int xen_allowed;
 
 static inline int xen_enabled(void)
 {
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_BACKEND
     return xen_allowed;
 #else
     return 0;
-- 
1.6.0.2

[Qemu-devel] [PATCH 3/5] exec.c: Use ram_addr_t in cpu_physical_memory_rw(...).

[Alexander Graf]

From: Anthony PERARD <anthony.perard@citrix.com>

As the variable pd and addr1 inside the function cpu_physical_memory_rw
are mean to handle a RAM address, they should be of the ram_addr_t type
instead of unsigned long.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 exec.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index 2160ded..0393d39 100644
--- a/exec.c
+++ b/exec.c
@@ -3858,7 +3858,7 @@ void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf,
     uint8_t *ptr;
     uint32_t val;
     target_phys_addr_t page;
-    unsigned long pd;
+    ram_addr_t pd;
     PhysPageDesc *p;
 
     while (len > 0) {
@@ -3898,7 +3898,7 @@ void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf,
                     l = 1;
                 }
             } else {
-                unsigned long addr1;
+                ram_addr_t addr1;
                 addr1 = (pd & TARGET_PAGE_MASK) + (addr & ~TARGET_PAGE_MASK);
                 /* RAM case */
                 ptr = qemu_get_ram_ptr(addr1);
-- 
1.6.0.2

[Qemu-devel] [PATCH 4/5] xen: remove CONFIG_XEN_MAPCACHE

[Alexander Graf]

We were still exporting CONFIG_XEN_MAPCACHE, even though it's completely
unused by now. Remove it.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 configure |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 6911c3b..90fe09f 100755
--- a/configure
+++ b/configure
@@ -3277,9 +3277,6 @@ case "$target_arch2" in
     if test "$xen" = "yes" -a "$target_softmmu" = "yes" ; then
       target_phys_bits=64
       echo "CONFIG_XEN=y" >> $config_target_mak
-      if test "$cpu" = "i386" -o "$cpu" = "x86_64"; then
-          echo "CONFIG_XEN_MAPCACHE=y" >> $config_target_mak
-      fi
     fi
 esac
 case "$target_arch2" in
-- 
1.6.0.2

[Qemu-devel] [PATCH 5/5] xen: make xen_enabled even more clever

[Alexander Graf]

When using xen_enabled() we're currently only checking if xen is enabled
at all during the build. But what if you want to build multiple targets
out of which only one can potentially run xen code?

That means that for generic code we'll still have to fall back to the
variable and potentially slow the code down, but it's not as important as
that is mostly xen device emulation which is not touched for non-xen targets.

The target specific code however can with this patch see that it's unable to
ever execute xen code. We can thus always return 0 on xen_enabled(), giving
gcc enough hints to evict the mapcache code from the target memory management
code.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
---
 configure |    5 +++++
 hw/xen.h  |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/configure b/configure
index 90fe09f..e5ecec9 100755
--- a/configure
+++ b/configure
@@ -3277,7 +3277,12 @@ case "$target_arch2" in
     if test "$xen" = "yes" -a "$target_softmmu" = "yes" ; then
       target_phys_bits=64
       echo "CONFIG_XEN=y" >> $config_target_mak
+    else
+      echo "CONFIG_NO_XEN=y" >> $config_target_mak
     fi
+    ;;
+  *)
+    echo "CONFIG_NO_XEN=y" >> $config_target_mak
 esac
 case "$target_arch2" in
   i386|x86_64|ppcemb|ppc|ppc64|s390x)
diff --git a/hw/xen.h b/hw/xen.h
index 43b95d6..2162111 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -24,7 +24,7 @@ extern int xen_allowed;
 
 static inline int xen_enabled(void)
 {
-#ifdef CONFIG_XEN_BACKEND
+#if defined(CONFIG_XEN_BACKEND) && !defined(CONFIG_NO_XEN)
     return xen_allowed;
 #else
     return 0;
-- 
1.6.0.2