[Xen-devel] [PATCH V5 2/6] xen, Introduce unregister_io_handler

[anthony.perard@xxxxxxxxxx]

From: Anthony PERARD <anthony.perard@xxxxxxxxxx>

To remove a handler of the io handler list, by replacing it with the
last one.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 xen/arch/x86/hvm/intercept.c |   26 ++++++++++++++++++++++++++
 xen/include/asm-x86/hvm/io.h |    8 ++++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/intercept.c b/xen/arch/x86/hvm/intercept.c
index 4af9e3d..93dffc2 100644
--- a/xen/arch/x86/hvm/intercept.c
+++ b/xen/arch/x86/hvm/intercept.c
@@ -244,6 +244,32 @@ void register_io_handler(
     handler->num_slot++;
 }
 
+void unregister_io_handler(
+    struct domain *d, unsigned long addr, unsigned long size, int type)
+{
+    struct hvm_io_handler *handler = &d->arch.hvm_domain.io_handler;
+    int last = handler->num_slot - 1;
+    int i = 0;
+
+    for (i = 0; i <= last; i++) {
+        if (handler->hdl_list[i].addr == addr
+            && handler->hdl_list[i].size == size
+            && handler->hdl_list[i].type == type) {
+
+            handler->hdl_list[i].addr = handler->hdl_list[last].addr;
+            handler->hdl_list[i].size = handler->hdl_list[last].size;
+            handler->hdl_list[i].type = handler->hdl_list[last].type;
+            if (handler->hdl_list[i].type == HVM_PORTIO) {
+                handler->hdl_list[i].action.portio = 
handler->hdl_list[last].action.portio;
+            } else {
+                handler->hdl_list[i].action.mmio = 
handler->hdl_list[last].action.mmio;
+            }
+            handler->num_slot--;
+            return;
+        }
+    }
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-x86/hvm/io.h b/xen/include/asm-x86/hvm/io.h
index c10a0be..2ce8bc9 100644
--- a/xen/include/asm-x86/hvm/io.h
+++ b/xen/include/asm-x86/hvm/io.h
@@ -68,6 +68,8 @@ int hvm_io_intercept(ioreq_t *p, int type);
 void register_io_handler(
     struct domain *d, unsigned long addr, unsigned long size,
     void *action, int type);
+void unregister_io_handler(
+    struct domain *d, unsigned long addr, unsigned long size, int type);
 
 static inline int hvm_portio_intercept(ioreq_t *p)
 {
@@ -89,6 +91,12 @@ static inline void register_portio_handler(
     register_io_handler(d, addr, size, action, HVM_PORTIO);
 }
 
+static inline void unregister_portio_handler(
+    struct domain *d, unsigned long addr, unsigned long size)
+{
+    unregister_io_handler(d, addr, size, HVM_PORTIO);
+}
+
 static inline void register_buffered_io_handler(
     struct domain *d, unsigned long addr,
     unsigned long size, mmio_action_t action)
-- 
1.7.1


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