[v2,3/3] vhost: prevent zero copy mode if iommu is on
diff mbox series

Message ID 20190927181446.14336-4-amorenoz@redhat.com
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series
  • vhost: add support for IOVA_VA mode
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Checks

Context Check Description
ci/checkpatch warning coding style issues
ci/Intel-compilation fail Compilation issues

Commit Message

Adrian Moreno Sept. 27, 2019, 6:14 p.m. UTC
The simltaneous use of dequeue_zero_copy and IOMMU is problematic.
Not only because IOVA_VA mode is not supported but also because the
potential invalidation of guest pages while the buffers are in use
is not handled.

Prevent these two features to be enabled simultaneosly.

Fixes: 69c90e98f483 ("vhost: enable IOMMU support")
Cc: maxime.coquelin@redhat.com
Cc: stable@dpdk.org

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
---
 lib/librte_vhost/socket.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Patch
diff mbox series

diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c
index 274988c4d..63f73d2c9 100644
--- a/lib/librte_vhost/socket.c
+++ b/lib/librte_vhost/socket.c
@@ -871,6 +871,14 @@  rte_vhost_driver_register(const char *path, uint64_t flags)
 	}
 	vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
 
+	if(vsocket->dequeue_zero_copy &&
+	   (flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"error: enabling dequeue zero copy and IOMMU features "
+			"simultaneously is not supported\n");
+		goto out_mutex;
+	}
+
 	/*
 	 * Set the supported features correctly for the builtin vhost-user
 	 * net driver.