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Subject: [PATCH v8 25/28] vfio-user: implement VFIO_USER_DMA_READ/WRITE
Date: Wed, 19 Feb 2025 15:48:55 +0100
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From: Jagannathan Raman <jag.raman@oracle.com>
Unlike most other messages, this is a server->client message, for when a
server wants to do "DMA"; this is slow, so normally the server has
memory directly mapped instead.
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio-user/common.c | 57 +++++++++++++++++++++
hw/vfio-user/common.h | 3 ++
hw/vfio-user/pci.c | 110 ++++++++++++++++++++++++++++++++++++++++
hw/vfio-user/protocol.h | 13 ++++-
4 files changed, 182 insertions(+), 1 deletion(-)
diff --git a/hw/vfio-user/common.c b/hw/vfio-user/common.c
index b78b9e57e8..38f8eef317 100644
--- a/hw/vfio-user/common.c
+++ b/hw/vfio-user/common.c
@@ -377,6 +377,10 @@ static int vfio_user_recv_one(VFIOUserProxy *proxy)
*msg->hdr =3D hdr;
data =3D (char *)msg->hdr + sizeof(hdr);
} else {
+ if (hdr.size > proxy->max_xfer_size + sizeof(VFIOUserDMARW)) {
+ error_setg(&local_err, "vfio_user_recv request larger than max=
");
+ goto err;
+ }
buf =3D g_malloc0(hdr.size);
memcpy(buf, &hdr, sizeof(hdr));
data =3D buf + sizeof(hdr);
@@ -762,6 +766,59 @@ void vfio_user_wait_reqs(VFIOUserProxy *proxy)
qemu_mutex_unlock(&proxy->lock);
}
=20
+/*
+ * Reply to an incoming request.
+ */
+void vfio_user_send_reply(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int size)
+{
+
+ if (size < sizeof(VFIOUserHdr)) {
+ error_printf("vfio_user_send_reply - size too small\n");
+ g_free(hdr);
+ return;
+ }
+
+ /*
+ * convert header to associated reply
+ */
+ hdr->flags =3D VFIO_USER_REPLY;
+ hdr->size =3D size;
+
+ vfio_user_send_async(proxy, hdr, NULL);
+}
+
+/*
+ * Send an error reply to an incoming request.
+ */
+void vfio_user_send_error(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int erro=
r)
+{
+
+ /*
+ * convert header to associated reply
+ */
+ hdr->flags =3D VFIO_USER_REPLY;
+ hdr->flags |=3D VFIO_USER_ERROR;
+ hdr->error_reply =3D error;
+ hdr->size =3D sizeof(*hdr);
+
+ vfio_user_send_async(proxy, hdr, NULL);
+}
+
+/*
+ * Close FDs erroneously received in an incoming request.
+ */
+void vfio_user_putfds(VFIOUserMsg *msg)
+{
+ VFIOUserFDs *fds =3D msg->fds;
+ int i;
+
+ for (i =3D 0; i < fds->recv_fds; i++) {
+ close(fds->fds[i]);
+ }
+ g_free(fds);
+ msg->fds =3D NULL;
+}
+
static QLIST_HEAD(, VFIOUserProxy) vfio_user_sockets =3D
QLIST_HEAD_INITIALIZER(vfio_user_sockets);
=20
diff --git a/hw/vfio-user/common.h b/hw/vfio-user/common.h
index f7cc02d2e7..f8c61f2128 100644
--- a/hw/vfio-user/common.h
+++ b/hw/vfio-user/common.h
@@ -105,6 +105,9 @@ void vfio_user_send_nowait(VFIOUserProxy *proxy, VFIOUs=
erHdr *hdr,
VFIOUserFDs *fds, int rsize);
void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr,
VFIOUserFDs *fds, int rsize);
+void vfio_user_send_reply(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int size=
);
+void vfio_user_send_error(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int erro=
r);
+void vfio_user_putfds(VFIOUserMsg *msg);
=20
extern VFIODeviceIO vfio_dev_io_sock;
=20
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index d520b7592b..e65c7eaf02 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -96,6 +96,95 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vdev)
vdev->msix->pba_region =3D NULL;
}
=20
+static void vfio_user_dma_read(VFIOPCIDevice *vdev, VFIOUserDMARW *msg)
+{
+ PCIDevice *pdev =3D &vdev->pdev;
+ VFIOUserProxy *proxy =3D vdev->vbasedev.proxy;
+ VFIOUserDMARW *res;
+ MemTxResult r;
+ size_t size;
+
+ if (msg->hdr.size < sizeof(*msg)) {
+ vfio_user_send_error(proxy, &msg->hdr, EINVAL);
+ return;
+ }
+ if (msg->count > proxy->max_xfer_size) {
+ vfio_user_send_error(proxy, &msg->hdr, E2BIG);
+ return;
+ }
+
+ /* switch to our own message buffer */
+ size =3D msg->count + sizeof(VFIOUserDMARW);
+ res =3D g_malloc0(size);
+ memcpy(res, msg, sizeof(*res));
+ g_free(msg);
+
+ r =3D pci_dma_read(pdev, res->offset, &res->data, res->count);
+
+ switch (r) {
+ case MEMTX_OK:
+ if (res->hdr.flags & VFIO_USER_NO_REPLY) {
+ g_free(res);
+ return;
+ }
+ vfio_user_send_reply(proxy, &res->hdr, size);
+ break;
+ case MEMTX_ERROR:
+ vfio_user_send_error(proxy, &res->hdr, EFAULT);
+ break;
+ case MEMTX_DECODE_ERROR:
+ vfio_user_send_error(proxy, &res->hdr, ENODEV);
+ break;
+ case MEMTX_ACCESS_ERROR:
+ vfio_user_send_error(proxy, &res->hdr, EPERM);
+ break;
+ default:
+ error_printf("vfio_user_dma_read unknown error %d\n", r);
+ vfio_user_send_error(vdev->vbasedev.proxy, &res->hdr, EINVAL);
+ }
+}
+
+static void vfio_user_dma_write(VFIOPCIDevice *vdev, VFIOUserDMARW *msg)
+{
+ PCIDevice *pdev =3D &vdev->pdev;
+ VFIOUserProxy *proxy =3D vdev->vbasedev.proxy;
+ MemTxResult r;
+
+ if (msg->hdr.size < sizeof(*msg)) {
+ vfio_user_send_error(proxy, &msg->hdr, EINVAL);
+ return;
+ }
+ /* make sure transfer count isn't larger than the message data */
+ if (msg->count > msg->hdr.size - sizeof(*msg)) {
+ vfio_user_send_error(proxy, &msg->hdr, E2BIG);
+ return;
+ }
+
+ r =3D pci_dma_write(pdev, msg->offset, &msg->data, msg->count);
+
+ switch (r) {
+ case MEMTX_OK:
+ if ((msg->hdr.flags & VFIO_USER_NO_REPLY) =3D=3D 0) {
+ vfio_user_send_reply(proxy, &msg->hdr, sizeof(msg->hdr));
+ } else {
+ g_free(msg);
+ }
+ break;
+ case MEMTX_ERROR:
+ vfio_user_send_error(proxy, &msg->hdr, EFAULT);
+ break;
+ case MEMTX_DECODE_ERROR:
+ vfio_user_send_error(proxy, &msg->hdr, ENODEV);
+ break;
+ case MEMTX_ACCESS_ERROR:
+ vfio_user_send_error(proxy, &msg->hdr, EPERM);
+ break;
+ default:
+ error_printf("vfio_user_dma_write unknown error %d\n", r);
+ vfio_user_send_error(vdev->vbasedev.proxy, &msg->hdr, EINVAL);
+ }
+}
+
/*
* Incoming request message callback.
*
@@ -103,7 +192,28 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vde=
v)
*/
static void vfio_user_pci_process_req(void *opaque, VFIOUserMsg *msg)
{
+ VFIOPCIDevice *vdev =3D opaque;
+ VFIOUserHdr *hdr =3D msg->hdr;
+
+ /* no incoming PCI requests pass FDs */
+ if (msg->fds !=3D NULL) {
+ vfio_user_send_error(vdev->vbasedev.proxy, hdr, EINVAL);
+ vfio_user_putfds(msg);
+ return;
+ }
=20
+ switch (hdr->command) {
+ case VFIO_USER_DMA_READ:
+ vfio_user_dma_read(vdev, (VFIOUserDMARW *)hdr);
+ break;
+ case VFIO_USER_DMA_WRITE:
+ vfio_user_dma_write(vdev, (VFIOUserDMARW *)hdr);
+ break;
+ default:
+ error_printf("vfio_user_pci_process_req unknown cmd %d\n",
+ hdr->command);
+ vfio_user_send_error(vdev->vbasedev.proxy, hdr, ENOSYS);
+ }
}
=20
/*
diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h
index 109076d820..6bc5809cce 100644
--- a/hw/vfio-user/protocol.h
+++ b/hw/vfio-user/protocol.h
@@ -201,7 +201,18 @@ typedef struct {
char data[];
} VFIOUserRegionRW;
=20
-/*imported from struct vfio_bitmap */
+/*
+ * VFIO_USER_DMA_READ
+ * VFIO_USER_DMA_WRITE
+ */
+typedef struct {
+ VFIOUserHdr hdr;
+ uint64_t offset;
+ uint32_t count;
+ char data[];
+} VFIOUserDMARW;
+
+/* imported from struct vfio_bitmap */
typedef struct {
uint64_t pgsize;
uint64_t size;
--=20
2.34.1