[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Query] Flow of PCI device dedicated to a domU
Hello Simon, Tuesday, July 22, 2014, 4:56:57 PM, you wrote: > Hello Stefano, >> The basic mechanism is that Xen assigns the PCI root complex/host >> bridge to Dom0. Dom0 walks the bus and finds out the devices available. >> When the user assigns a PCI device to a VM, the toolstack (xl/libxl) >> issues hypercalls to remap interrupts and MMIO regions of that device >> into the guest VM. > I am currently trying writing my own PCI front to access directly a > PCI device from my PV guest. > If I read this correctly you are saying that the MMIO region is > already mapped into my domain by xl? So when I go and read the BAR > register from the PCI configuration I can just go and access it > directly or do I have to update the VA mapping? Just a clarification here, when I say "go and access it" what I meant to say was "go and access directly in my PV the memory at the BAR address". -- Best regards, Simon mailto:furryfuttock@xxxxxxxxx _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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