On Mon, Feb 28, 2022 at 07:54:38PM +0000, Jag Raman wrote:
>
>
> > On Feb 22, 2022, at 5:40 AM, Stefan Hajnoczi <stefa...@redhat.com> wrote:
> >
> > On Thu, Feb 17, 2022 at 02:48:59AM -0500, Jagannathan Raman wrote:
> >> +struct RemoteIommuElem {
> >> + AddressSpace as;
> >> + MemoryRegion mr;
> >> +};
> >> +
> >> +GHashTable *remote_iommu_elem_by_bdf;
> >
> > A mutable global hash table requires synchronization when device
> > emulation runs in multiple threads.
> >
> > I suggest using pci_setup_iommu()'s iommu_opaque argument to avoid the
> > global. If there is only 1 device per remote PCI bus, then there are no
> > further synchronization concerns.
>
> OK, will avoid the global. We would need to access the hash table
> concurrently since there could be more than one device in the
> same bus - so a mutex would be needed here.I thought the PCIe topology can be set up with a separate buf for each x-vfio-user-server? I remember something like that in the previous revision where a root port was instantiated for each x-vfio-user-server. Stefan
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