@@ -298,6 +298,34 @@ int rangeset_report_ranges(
return rc;
}
+int rangeset_consume_ranges(
+ struct rangeset *r,
+ int (*cb)(unsigned long s, unsigned long e, void *, unsigned long *c),
+ void *ctxt)
+{
+ int rc = 0;
+
+ write_lock(&r->lock);
+ while ( !rangeset_is_empty(r) )
+ {
+ unsigned long consumed = 0;
+ struct range *x = first_range(r);
+
+ rc = cb(x->s, x->e, ctxt, &consumed);
+
+ ASSERT(consumed <= x->e - x->s + 1);
+ x->s += consumed;
+ if ( x->s > x->e )
+ destroy_range(r, x);
+
+ if ( rc )
+ break;
+ }
+ write_unlock(&r->lock);
+
+ return rc;
+}
+
int rangeset_add_singleton(
struct rangeset *r, unsigned long s)
{
@@ -68,6 +68,16 @@ int rangeset_report_ranges(
struct rangeset *r, unsigned long s, unsigned long e,
int (*cb)(unsigned long s, unsigned long e, void *), void *ctxt);
+/*
+ * Note that the consume function can return an error value apart from
+ * -ERESTART, and that no cleanup is performed (ie: the user should call
+ * rangeset_destroy if needed).
+ */
+int rangeset_consume_ranges(struct rangeset *r,
+ int (*cb)(unsigned long s, unsigned long e,
+ void *, unsigned long *c),
+ void *ctxt);
+
/* Add/remove/query a single number. */
int __must_check rangeset_add_singleton(
struct rangeset *r, unsigned long s);
This function allows to iterate over a rangeset while removing the processed regions. This will be used in order to split processing of large memory areas when mapping them into the guest p2m. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> --- Cc: George Dunlap <George.Dunlap@eu.citrix.com> Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Jan Beulich <jbeulich@suse.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Tim Deegan <tim@xen.org> Cc: Wei Liu <wei.liu2@citrix.com> --- Changes since v6: - Expand commit message. - Add a comment to describe the expected function behavior. - Fix indentation. Changes since v5: - New in this version. --- xen/common/rangeset.c | 28 ++++++++++++++++++++++++++++ xen/include/xen/rangeset.h | 10 ++++++++++ 2 files changed, 38 insertions(+)