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From: | Alistair |
Subject: | Re: [Qemu-devel] [PATCH v5 0/5] Connect a PCIe host and graphics support to RISC-V |
Date: | Wed, 10 Oct 2018 10:57:02 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 10/10/2018 05:26 AM, Andrea Bolognani wrote:
On Thu, 2018-10-04 at 20:06 +0000, Alistair Francis wrote:Alistair Francis (5): hw/riscv/virt: Increase the number of interrupts hw/riscv/virt: Connect the gpex PCIe riscv: Enable VGA and PCIE_VGA hw/riscv/sifive_u: Connect the Xilinx PCIe hw/riscv/virt: Connect a VirtIO net PCIe device default-configs/riscv32-softmmu.mak | 10 +++- default-configs/riscv64-softmmu.mak | 10 +++- hw/riscv/sifive_u.c | 64 +++++++++++++++++++++++++ hw/riscv/virt.c | 72 +++++++++++++++++++++++++++++ include/hw/riscv/sifive_u.h | 4 +- include/hw/riscv/virt.h | 6 ++- 6 files changed, 161 insertions(+), 5 deletions(-)I gave v4 a try a few weeks ago because I wanted to see what would be needed to wire this up on the libvirt side. Turns out, not much really :)
Great!
I still have a couple of questions that hopefully you'll be able to answer: * what should libvirt look for to figure out whether or not a RISC-V guest will have PCI support? For aarch64 we look for the presence of the 'gpex-pcihost' device, but of course that won't work for RISC-V so we need something else;
I'm not sure what you mean here. Why can we not do the same thing with RISC-V?
* I have succesfully started a RISC-V guest with virtio-pci devices attached but, while they show up in 'info qtree' and friends, the guest OS itself doesn't seem to recognize any of them - not even pcie.0! I'm using the guest images listed at [1] and following the corresponding instructions, but I think the BBL build (config at [2]) is missing some feature... Any ideas what we would need to add there?
I use this monolithic config: https://github.com/alistair23/meta-riscv/blob/7a950aa705b439b5ec19bb6f094930888335ba7b/recipes-kernel/linux/files/freedom-u540/defconfig
It has way too much enabled, but I think if you copy the PCIe part that should be enough.
My colleague Atish has Fedora booting on real hardware with the MicroSemi PCIe support. You can also see his config here: https://github.com/westerndigitalcorporation/RISC-V-Linux/blob/master/riscv-linux-conf/config_fedora_success_4.19_demo_sep11
Obviously on top of that you will need to enable the VirtIO support as that doesn't exist in the hardware.
Alistair
If you can help with these I'll give the patches another spin and gladly provide my Tested-by :) [1] https://fedoraproject.org/wiki/Architectures/RISC-V/Installing [2] https://github.com/rwmjones/fedora-riscv-kernel/blob/master/config
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