Re: [libvirt] [PATCH 3/3] qemu: use qemu-xhci USB controller by default for ppc64 and aarch64

On Thu, 2017-04-27 at 10:24 +0200, Pavel Hrdina wrote: > > You're technically correct[1]. However, piix3-uhci is > > another piece of Intel-derived hardware so in practice > > qemu-system-aarch64 is very unlikely to have it compiled > > in and most users will end up getting the error instead. >  > Isn't the nec-xhci also Intel hardware, so the same would apply to that > controller as well. Not quite:   Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] [8086:7020]   NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] The vendor for piix3-uhci is Intel Corporation, the vendor for nec-xhci is NEC Corporation. I guess both are unlikely to show up in actual aarch64 hardware, but the former is clearly x86-specific while the latter is somewhat more architecture-agnostic. > Moreover, this probably happens only for downstream > builds of QEMU (most likely only RHEL/CentOS) as there is no configure > option for that.  QEMU has some default configs for different architectures > but in upstream QEMU the set of UHCI usb controllers is enabled by default > for aarch64. The upstream QEMU configuration takes the kitchen sink approach, eg. qemu-system-ppc64 will include allwinner-ahci and other devices that clearly have no place in a ppc64 guest, so I don't think we should take that as an indication that piix-uhci is something anyone will want to reasonably use on aarch64 :)

--  Andrea Bolognani / Red Hat / Virtualization -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list