Re: [PATCH] vfio-pci: Use io_remap_pfn_range() for PCI IO memory

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On Tue, Nov 17, 2020 at 10:37:18AM -0600, Tom Lendacky wrote:

> > Ideally it won't, but trapping through QEMU is a common debugging
> > technique and required if we implement virtualization quirks for a
> > device in QEMU.  So I believe what you're saying is that device
> > assignment on SEV probably works only when we're using direct mapping
> > of the mmap into the VM and tracing or quirks would currently see
> > encrypted data.  Has anyone had the opportunity to check that we don't
> > break device assignment to VMs with this patch?  Thanks,
> 
> I have not been able to test device assignment with this patch, yet. Jason?

I don't have SME systems, we have a customer that reported RDMA didn't
work and confirmed the similar RDMA patch worked.

I know VFIO is basically identical, so it should be applicable here
too.

Jasnon



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