> Am 24.06.2016 um 20:16 schrieb Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>: > >> On 24 June 2016 at 16:04, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: >> [...] >> Note that this issue not only affects framebuffers on PCI cards, it >> also affects emulated USB host controllers (perhaps Alex can remind us >> which one exactly?) > > Actually, looking at the QEMU source code, I am not able to spot the > USB hcd emulation code that backs a PCI MMIO BAR using host memory, > and in fact, the only instance I *can* find is vga-pci.c > > @Alex: could you please explain which exact issue with USB emulation > is suspected to be caused by this? IIRC Linux put thhe usb rings into guest memory and mapped them as NC inside the guest. So the host will see stale data from the cache. Alex _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
