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....@citrix.com>
---
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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