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2015-02-26virtio: use standard virtio_ring.hMichael S. Tsirkin
Switch to virtio_ring.h from standard headers. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-02-16dataplane: endianness-aware accessesCornelia Huck
The vring.c code currently assumes that guest and host endianness match, which is not true for a number of cases: - emulating targets with a different endianness than the host - bi-endian targets, where the correct endianness depends on the virtio device - upcoming support for the virtio-1 standard mandates little-endian accesses even for big-endian targets and hosts Make sure to use accessors that depend on the virtio device. Note that dataplane now needs to be built per-target. Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Fam Zheng <famz@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Tested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1422289602-17874-2-git-send-email-cornelia.huck@de.ibm.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22virtio: Import virtio_vring.hFam Zheng
This header has no further dependencies. It only has some stable data types and primitive functions, so we can copy it to include/hw/virtio in order to allow vring code (and its user virtio-blk dataplane) to be built unconditionally, even for cross compiling. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1410329871-28885-2-git-send-email-famz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-14virtio-blk: embed VirtQueueElement in VirtIOBlockReqStefan Hajnoczi
The memory allocation between hw/block/virtio-blk.c, hw/block/dataplane/virtio-blk.c, and hw/virtio/dataplane/vring.c is messy. Structs are allocated in different files than they are freed in. This is risky and makes memory leaks easier. Embed VirtQueueElement in VirtIOBlockReq to reduce the amount of memory allocation we need to juggle. This also makes vring.c and virtio.c slightly more similar. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-07-14dataplane: do not free VirtQueueElement in vring_push()Stefan Hajnoczi
VirtQueueElement is allocated in vring_pop() so it seems to make sense that vring_push() should free it. Alas, virtio-blk frees VirtQueueElement itself in virtio_blk_free_request(). This patch solves a double-free assertion in glib's g_slice_free(). Rename vring_free_element() to vring_unmap_element() since it no longer frees the VirtQueueElement. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-12-20dataplane: replace hostmem with memory_region_findPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-12-20dataplane: change vring API to use VirtQueueElementPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-19dataplane: sync virtio.c and vring.c virtqueue stateStefan Hajnoczi
Load the virtio.c state into vring.c when we start dataplane mode and vice versa when stopping dataplane mode. This patch makes it possible to start and stop dataplane any time while the guest is running. This will eventually allow us to go back to QEMU main loop for bdrv_drain_all() and live migration. In the meantime, this patch makes the dataplane lifecycle more robust but should make no visible difference. It may be useful in the virtio-net dataplane effort. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-04memory: add ref/unref callsPaolo Bonzini
Add ref/unref calls at the following places: - places where memory regions are stashed by a listener and used outside the BQL (including in Xen or KVM). - memory_region_find callsites - creation of aliases and containers (only the aliased/contained region gets a reference to avoid loops) - around calls to del_subregion/add_subregion, where the region could disappear after the first call Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-04-08hw: move headers to include/Paolo Bonzini
Many of these should be cleaned up with proper qdev-/QOM-ification. Right now there are many catch-all headers in include/hw/ARCH depending on cpu.h, and this makes it necessary to compile these files per-target. However, fixing this does not belong in these patches. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>