linux-kernel - [PATCH v3] virtio: add VIRTIO_RING_NO

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Message-ID: <20190911124942.243713-1-matej.genci@nutanix.com>
Date:   Wed, 11 Sep 2019 12:49:53 +0000
From:   Matej Genci <matej.genci@...anix.com>
To:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Matej Genci <matej.genci@...anix.com>
Subject: [PATCH v3] virtio: add VIRTIO_RING_NO_LEGACY

Add macro to disable legacy vring functions.

Signed-off-by: Matej Genci <matej.genci@...anix.com>
---

v3: Removed struct vring from inside the #ifndef since
    include/linux/vring.h depends on its definition.

---
 drivers/virtio/virtio_pci_modern.c | 1 +
 include/uapi/linux/virtio_ring.h   | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 7abcc50838b8..db93cedd262f 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -16,6 +16,7 @@
 
 #include <linux/delay.h>
 #define VIRTIO_PCI_NO_LEGACY
+#define VIRTIO_RING_NO_LEGACY
 #include "virtio_pci_common.h"
 
 /*
diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 4c4e24c291a5..fb3e573bdd37 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -135,6 +135,8 @@ struct vring {
 #define VRING_USED_ALIGN_SIZE 4
 #define VRING_DESC_ALIGN_SIZE 16
 
+#ifndef VIRTIO_RING_NO_LEGACY
+
 /* The standard layout for the ring is a continuous chunk of memory which looks
  * like this.  We assume num is a power of 2.
  *
@@ -181,6 +183,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align)
 		+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
 }
 
+#endif /* VIRTIO_RING_NO_LEGACY */
+
 /* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */
 /* Assuming a given event_idx value from the other side, if
  * we have just incremented index from old to new_idx,
-- 
2.22.0