[Xen-devel] [PATCH 4/7] ioreq: allow registering internal ioreq server handler

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Provide a routine to register the handler for an internal ioreq
server. Note the handler can only be set once.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/hvm/ioreq.c        | 32 ++++++++++++++++++++++++++++++++
 xen/include/asm-x86/hvm/ioreq.h |  3 +++
 2 files changed, 35 insertions(+)

diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index 3fb6fe9585..d8fea191aa 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -486,6 +486,38 @@ static int hvm_add_ioreq_gfn(struct hvm_ioreq_server *s, 
bool buf)
     return rc;
 }
 
+int hvm_add_ioreq_handler(struct domain *d, ioservid_t id,
+                          int (*handler)(struct vcpu *v, ioreq_t *))
+{
+    struct hvm_ioreq_server *s;
+    int rc = 0;
+
+    spin_lock_recursive(&d->arch.hvm.ioreq_server.lock);
+    s = get_ioreq_server(d, id);
+    if ( !s )
+    {
+        rc = -ENOENT;
+        goto out;
+    }
+    if ( !s->internal )
+    {
+        rc = -EINVAL;
+        goto out;
+    }
+    if ( s->handler != NULL )
+    {
+        rc = -EBUSY;
+        goto out;
+    }
+
+    s->handler = handler;
+
+ out:
+    spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock);
+
+    return rc;
+}
+
 static void hvm_update_ioreq_evtchn(struct hvm_ioreq_server *s,
                                     struct hvm_ioreq_vcpu *sv)
 {
diff --git a/xen/include/asm-x86/hvm/ioreq.h b/xen/include/asm-x86/hvm/ioreq.h
index e8119b26a6..2131c944d4 100644
--- a/xen/include/asm-x86/hvm/ioreq.h
+++ b/xen/include/asm-x86/hvm/ioreq.h
@@ -55,6 +55,9 @@ unsigned int hvm_broadcast_ioreq(ioreq_t *p, bool buffered);
 
 void hvm_ioreq_init(struct domain *d);
 
+int hvm_add_ioreq_handler(struct domain *d, ioservid_t id,
+                          int (*handler)(struct vcpu *v, ioreq_t *));
+
 #endif /* __ASM_X86_HVM_IOREQ_H__ */
 
 /*
-- 
2.22.0


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