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[PATCH 3/3] vhost: correctly detect the enabling IOMMU
From: |
Jason Wang |
Subject: |
[PATCH 3/3] vhost: correctly detect the enabling IOMMU |
Date: |
Wed, 4 Aug 2021 11:48:03 +0800 |
Vhost used to compare the dma_as against the address_space_memory to
detect whether the IOMMU is enabled or not. This might not work well
since the virito-bus may call get_dma_as if VIRTIO_F_IOMMU_PLATFORM is
set without an actual IOMMU enabled when device is plugged. In the
case of PCI where pci_get_address_space() is used, the bus master as
is returned. So vhost actually tries to enable device IOTLB even if
the IOMMU is not enabled. This will lead a lots of unnecessary
transactions between vhost and Qemu and will introduce a huge drop of
the performance.
For PCI, an ideal approach is to use pci_device_iommu_address_space()
just for get_dma_as. But Qemu may choose to initialize the IOMMU after
the virtio-pci which lead a wrong address space is returned during
device plugged. So this patch switch to use transport specific way via
iommu_enabled() to detect the IOMMU during vhost start. In this case,
we are fine since we know the IOMMU is initialized correctly.
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/virtio/vhost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 7b7bde7657..d2097b7423 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -286,7 +286,7 @@ static int vhost_dev_has_iommu(struct vhost_dev *dev)
* does not have IOMMU, there's no need to enable this feature
* which may cause unnecessary IOTLB miss/update trnasactions.
*/
- return vdev->dma_as != &address_space_memory &&
+ return virtio_bus_device_iommu_enabled(vdev) &&
virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
}
--
2.25.1