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From 3a5d325fcb2958318262efac31d5fd25fb062523 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Thu, 21 Jul 2022 15:38:55 +0200
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Subject: [PATCH 21/32] vdpa: Export vhost_vdpa_dma_map and unmap calls
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 108: Net Control Virtqueue shadow Support
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RH-Commit: [21/27] 97e7a583bbd3c12a0786d53132812ec41702c190 (eperezmartin/qemu-kvm)
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RH-Bugzilla: 1939363
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/1939363
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Upstream Status: git://git.qemu.org/qemu.git
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commit 463ba1e3b8cf080812895c5f26d95d8d7db2e692
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:40 2022 +0200
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vdpa: Export vhost_vdpa_dma_map and unmap calls
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Shadow CVQ will copy buffers on qemu VA, so we avoid TOCTOU attacks from
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the guest that could set a different state in qemu device model and vdpa
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device.
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To do so, it needs to be able to map these new buffers to the device.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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hw/virtio/vhost-vdpa.c | 7 +++----
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include/hw/virtio/vhost-vdpa.h | 4 ++++
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2 files changed, 7 insertions(+), 4 deletions(-)
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diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
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index 28df57b12e..14b02fe079 100644
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--- a/hw/virtio/vhost-vdpa.c
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+++ b/hw/virtio/vhost-vdpa.c
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@@ -71,8 +71,8 @@ static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section,
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return false;
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}
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-static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
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- void *vaddr, bool readonly)
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+int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
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+ void *vaddr, bool readonly)
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{
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struct vhost_msg_v2 msg = {};
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int fd = v->device_fd;
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@@ -97,8 +97,7 @@ static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
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return ret;
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}
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-static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova,
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- hwaddr size)
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+int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size)
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{
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struct vhost_msg_v2 msg = {};
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int fd = v->device_fd;
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diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
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index a29dbb3f53..7214eb47dc 100644
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--- a/include/hw/virtio/vhost-vdpa.h
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+++ b/include/hw/virtio/vhost-vdpa.h
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@@ -39,4 +39,8 @@ typedef struct vhost_vdpa {
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VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
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} VhostVDPA;
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+int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
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+ void *vaddr, bool readonly);
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+int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size);
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+
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#endif
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--
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2.31.1
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