[Xen-changelog] [xen master] xen/arm: Add new platform specific callback device_is_blacklist

[patchbot@xxxxxxx]

commit 7cb187fa95931f3b704cd9f5820924eec1c7870c
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Fri Sep 13 13:49:26 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Sep 17 15:28:55 2013 +0100

    xen/arm: Add new platform specific callback device_is_blacklist
    
    Each platform code will list the device that must not pass-through to a 
guest.
    Theses devices are used for: power management, timer,...
    
    When theses devices are given to DOM0, it can controls the hardware and then
    break the whole platform.
    
    This callback is enough until we will start to care about power performance.
    For this purpose, we may need to extend this interface to implement 
per-device
    MMIO filtering to allow dom0 to continue to control devices which it owns 
which
    happen to share e.g. a clock controller with Xen.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c    |    3 ++-
 xen/arch/arm/platform.c        |   10 ++++++++++
 xen/include/asm-arm/platform.h |    7 +++++++
 3 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index cda1e13..300a64d 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -676,7 +676,8 @@ static int handle_node(struct domain *d, struct kernel_info 
*kinfo,
     DPRINT("handle %s\n", path);
 
     /* Skip theses nodes and the sub-nodes */
-    if ( dt_match_node(skip_matches, np ) )
+    if ( dt_match_node(skip_matches, np ) ||
+         platform_device_is_blacklisted(np) )
     {
         DPRINT("  Skip it!\n");
         return 0;
diff --git a/xen/arch/arm/platform.c b/xen/arch/arm/platform.c
index afda302..db79368 100644
--- a/xen/arch/arm/platform.c
+++ b/xen/arch/arm/platform.c
@@ -127,6 +127,16 @@ bool_t platform_has_quirk(uint32_t quirk)
     return !!(quirks & quirk);
 }
 
+bool_t platform_device_is_blacklisted(const struct dt_device_node *node)
+{
+    const struct dt_device_match *blacklist = NULL;
+
+    if ( platform && platform->blacklist_dev )
+        blacklist = platform->blacklist_dev;
+
+    return dt_match_node(blacklist, node);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/platform.h b/xen/include/asm-arm/platform.h
index f460e9c..a19dbf7 100644
--- a/xen/include/asm-arm/platform.h
+++ b/xen/include/asm-arm/platform.h
@@ -4,6 +4,7 @@
 #include <xen/init.h>
 #include <xen/sched.h>
 #include <xen/mm.h>
+#include <xen/device_tree.h>
 
 /* Describe specific operation for a board */
 struct platform_desc {
@@ -26,6 +27,11 @@ struct platform_desc {
      * board with different quirk on each
      */
     uint32_t (*quirks)(void);
+    /*
+     * Platform blacklist devices
+     * List of devices which must not pass-through to a guest
+     */
+    const struct dt_device_match *blacklist_dev;
 };
 
 /*
@@ -40,6 +46,7 @@ int __init platform_specific_mapping(struct domain *d);
 void platform_reset(void);
 void platform_poweroff(void);
 bool_t platform_has_quirk(uint32_t quirk);
+bool_t platform_device_is_blacklisted(const struct dt_device_node *node);
 
 #define PLATFORM_START(_name, _namestr)                         \
 static const struct platform_desc  __plat_desc_##_name __used   \
--
generated by git-patchbot for /home/xen/git/xen.git#master

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