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Subject: Re: [PATCH v2 0/6] Extend vhost-user to support VFIO based accelerators
On Wed, Mar 28, 2018 at 08:24:07PM +0800, Tiwei Bie wrote: > > > Update notes > > > ============ > > > > > > IOMMU feature bit check is removed in this version, because: > > > > > > The IOMMU feature is negotiable, when an accelerator is used and > > > it doesn't support virtual IOMMU, its driver just won't provide > > > this feature bit when vhost library querying its features. And if > > > it supports the virtual IOMMU, its driver can provide this feature > > > bit. It's not reasonable to add this limitation in this patch set. > > > > Fair enough. Still: > > Can hardware on intel platforms actually support IOTLB requests? > > Don't you need to add support for vIOMMU shadowing instead? > > > > For the hardware I have, I guess they can't for now. So VFIO in QEMU has support for vIOMMU shadowing. Can you use that somehow? Ability to run dpdk within guest seems important. -- MST
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