Hi Edward, On 02/08/2016 12:13 PM, Edward Cragg wrote: > Hi Eric, > > On Thu, Feb 04, 2016 at 06:30:34PM +0100, Eric Auger wrote: >> Hi Edward, >> On 02/04/2016 05:53 PM, Edward Cragg wrote: >>> Hi, >>> >>> I'm involved in planning a project for which there is a requirement for PCIe >>> passthrough in KVM on ARMv8. We have no hardware to test on at the moment. >>> >>> I understand that virtualisation support for ARM is quite young, and it seems >>> like support is trickling in at the moment for this sort of thing. >>> >>> Is anyone working on PCIe passthrough on ARM platforms who might be able to >>> share some insight into what would be required to support this? >> Yes I am currently working on this topic at the moment and especially on >> ARM PCIe passthrough with MSI enabled. I did not test PCIe passthrough >> with legacy INTx (MSI disabled) but this should work already with >> upstreamed QEMU and kernel. >> >> With MSI enabled, the code is not upstreamed yet. >> >> I have a QEMU series: >> >> [RFC v2 0/8] KVM PCI/MSI passthrough with mach-virt >> (https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg349574.html) >> >> and a kernel series: >> [PATCH 00/10] KVM PCIe/MSI passthrough on ARM/ARM64" >> (https://lkml.org/lkml/2016/1/26/371) >> >> This is functional, tested on v8 AMD HW with a GICv2M (single MSI frame). >> >> This is in an early stage, especially on kernel side since lots of >> issues still need to be addressed, especially handling proper IRQ isolation. > > Thank you, this is good to know. > >> What kind of MSI controller do you plan to use? > > Do you mean the GIC itself? From registers, it appears to be a standard ARM > GIC, though i'm not sure exactly which one yet. However, it's stated in the > processor's datasheet that legacy interrupts aren't supported. It's one of the > newer Samsung Exynos processors. I meant GICv2m (featuring single or multiple MSI frames) or GICv3 ITS or any other proprietary interrupt controller IP supporting MSIs. Best Regards Eric > > Thanks, > > Ed > >> Hope this helps >> >> Best Regards >> >> Eric >> >>> >>> Thanks, >>> >>> Ed >>> _______________________________________________ >>> kvmarm mailing list >>> kvmarm@xxxxxxxxxxxxxxxxxxxxx >>> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm >>> >> >> _______________________________________________ >> kvmarm mailing list >> kvmarm@xxxxxxxxxxxxxxxxxxxxx >> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
