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[PULL 6/9] virtio: list legacy-capable devices
From: |
Michael S. Tsirkin |
Subject: |
[PULL 6/9] virtio: list legacy-capable devices |
Date: |
Wed, 22 Jul 2020 08:09:27 -0400 |
From: Cornelia Huck <cohuck@redhat.com>
Several types of virtio devices had already been around before the
virtio standard was specified. These devices support virtio in legacy
(and transitional) mode.
Devices that have been added in the virtio standard are considered
non-transitional (i.e. with no support for legacy virtio).
Provide a helper function so virtio transports can figure that out
easily.
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200707105446.677966-2-cohuck@redhat.com>
Cc: qemu-stable@nongnu.org
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/hw/virtio/virtio.h | 2 ++
hw/virtio/virtio.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index b69d517496..198ffc7626 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -396,4 +396,6 @@ static inline bool virtio_device_disabled(VirtIODevice
*vdev)
return unlikely(vdev->disabled || vdev->broken);
}
+bool virtio_legacy_allowed(VirtIODevice *vdev);
+
#endif
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 5bd2a2f621..546a198e79 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -27,6 +27,7 @@
#include "hw/virtio/virtio-access.h"
#include "sysemu/dma.h"
#include "sysemu/runstate.h"
+#include "standard-headers/linux/virtio_ids.h"
/*
* The alignment to use between consumer and producer parts of vring.
@@ -3279,6 +3280,30 @@ void virtio_init(VirtIODevice *vdev, const char *name,
vdev->use_guest_notifier_mask = true;
}
+/*
+ * Only devices that have already been around prior to defining the virtio
+ * standard support legacy mode; this includes devices not specified in the
+ * standard. All newer devices conform to the virtio standard only.
+ */
+bool virtio_legacy_allowed(VirtIODevice *vdev)
+{
+ switch (vdev->device_id) {
+ case VIRTIO_ID_NET:
+ case VIRTIO_ID_BLOCK:
+ case VIRTIO_ID_CONSOLE:
+ case VIRTIO_ID_RNG:
+ case VIRTIO_ID_BALLOON:
+ case VIRTIO_ID_RPMSG:
+ case VIRTIO_ID_SCSI:
+ case VIRTIO_ID_9P:
+ case VIRTIO_ID_RPROC_SERIAL:
+ case VIRTIO_ID_CAIF:
+ return true;
+ default:
+ return false;
+ }
+}
+
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
{
return vdev->vq[n].vring.desc;
--
MST
- [PULL 0/9] acpi,virtio,pc: bugfixes, Michael S. Tsirkin, 2020/07/22
- [PULL 1/9] acpi: accept byte and word access to core ACPI registers, Michael S. Tsirkin, 2020/07/22
- [PULL 2/9] virtio: Drop broken and superfluous object_property_set_link(), Michael S. Tsirkin, 2020/07/22
- [PULL 3/9] virtio-balloon: Prevent guest from starting a report when we didn't request one, Michael S. Tsirkin, 2020/07/22
- [PULL 4/9] virtio-balloon: Add locking to prevent possible race when starting hinting, Michael S. Tsirkin, 2020/07/22
- [PULL 5/9] virtio-balloon: Replace free page hinting references to 'report' with 'hint', Michael S. Tsirkin, 2020/07/22
- [PULL 6/9] virtio: list legacy-capable devices,
Michael S. Tsirkin <=
- [PULL 7/9] virtio: verify that legacy support is not accidentally on, Michael S. Tsirkin, 2020/07/22
- [PULL 8/9] intel_iommu: Use correct shift for 256 bits qi descriptor, Michael S. Tsirkin, 2020/07/22
- [PULL 9/9] virtio-pci: Changed vdev to proxy for VirtIO PCI BAR callbacks., Michael S. Tsirkin, 2020/07/22
- Re: [PULL 0/9] acpi,virtio,pc: bugfixes, Peter Maydell, 2020/07/23