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From: Adrian Moreno <amorenoz@redhat.com>
To: dev@dpdk.org
Cc: tiwei.bie@intel.com, zhihong.wang@intel.com,
	maxime.coquelin@redhat.com, Adrian Moreno <amorenoz@redhat.com>,
	stable@dpdk.org
Subject: [dpdk-dev] [PATCH v2 3/3] vhost: prevent zero copy mode if iommu is on
Date: Fri, 27 Sep 2019 20:14:46 +0200	[thread overview]
Message-ID: <20190927181446.14336-4-amorenoz@redhat.com> (raw)
In-Reply-To: <20190927181446.14336-1-amorenoz@redhat.com>

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(+)

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


      parent reply	other threads:[~2019-09-27 18:15 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27 18:14 [dpdk-dev] [PATCH v2 0/3] vhost: add support for IOVA_VA mode Adrian Moreno
2019-09-27 18:14 ` [dpdk-dev] [PATCH v2 1/3] vhost: translate incoming log address to gpa Adrian Moreno
2019-09-27 18:14 ` [dpdk-dev] [PATCH v2 2/3] vhost: convert buffer addresses to GPA for logging Adrian Moreno
2019-09-27 18:14 ` Adrian Moreno [this message]

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