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Author SHA1 Message Date
Stefano Stabellini f9e98e5d7a xen/blkif: Avoid double access to src->nr_segments 
src is stored in shared memory and src->nr_segments is dereferenced
twice at the end of the function.  If a compiler decides to compile this
into two separate memory accesses then the size limitation could be
bypassed.

Fix it by removing the double access to src->nr_segments.

This is part of XSA-155.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
 2015-12-18 15:09:58 +00:00
Olaf Hering f31352041b xen_disk: add discard support 
Implement discard support for xen_disk. It makes use of the existing
discard code in qemu.

The discard support is enabled unconditionally. The tool stack may
provide a property "discard-enable" in the backend node to optionally
disable discard support.  This is helpful in case the backing file was
intentionally created non-sparse to avoid fragmentation.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
 2014-05-07 16:18:04 +00:00
Paolo Bonzini 47b43a1f41 hw: move private headers to hw/ subdirectories. 
Many headers are used only in a single directory.  These can be
kept in hw/.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 2013-04-08 18:13:16 +02:00