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: [email protected]
Cc: [email protected]
Signed-off-by: Adrian Moreno <[email protected]>
---
lib/librte_vhost/socket.c | 8 ++++++++
1 file changed, 8 insertions(+)
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.
--
2.21.0
