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vhost-vdpa: print warning when vhost_vdpa_alloc_domain fails 

Add a print explaining why vhost_vdpa_alloc_domain failed if the device
is not IOMMU cache coherent capable.

Without this print, we have no hint why the operation failed.

For example:

$ virsh start <domain>
	error: Failed to start domain <domain>
	error: Unable to open '/dev/vhost-vdpa-<idx>' for vdpa device:
	       Unknown error 524

Suggested-by: Eugenio Perez Martin <eperezma@redhat.com>
Signed-off-by: Alvaro Karsz <alvaro.karsz@solid-run.com>

Message-Id: <20230202084212.1328530-1-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eugenio Pérez Martin <eperezma@redhat.com>
This commit is contained in:
Alvaro Karsz 2023-02-02 10:42:12 +02:00 committed by Michael S. Tsirkin
parent 08707b5c33
commit 6830a6aba9
1 changed files with 4 additions and 1 deletions
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5
drivers/vhost/vdpa.c
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@ -1151,8 +1151,11 @@ static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)
if (!bus)
return -EFAULT;
if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY))
if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) {
dev_warn_once(&v->dev,
"Failed to allocate domain, device is not IOMMU cache coherent capable\n");
return -ENOTSUPP;
}
v->domain = iommu_domain_alloc(bus);
if (!v->domain)