Hi, Jiaxun, On Mon, Apr 13, 2020 at 4:19 PM Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: > > On Mon, 13 Apr 2020 15:30:09 +0800 > Huacai Chen <chenhc@xxxxxxxxxx> wrote: > > > We are preparing to add KVM support for Loongson-3. VZ extension is > > fully supported in Loongson-3A R4+, and we will not care about old > > CPUs (at least now). We already have a full functional Linux kernel > > (based on Linux-5.4.x LTS) and QEMU (based on 5.0.0-rc2) and their git > > repositories are here: > > > > QEMU: https://github.com/chenhuacai/qemu > > Kernel: https://github.com/chenhuacai/linux > > > > Of course these two repositories need to be rework and not suitable > > for upstream (especially the commits need to be splitted). We show > > them here is just to tell others what we have done, and how > > KVM/Loongson will look like. > > > > Our plan is make the KVM host side be upstream first, and after that, > > we will make the KVM guest side and QEMU emulator be upstream. > > + Aleksandar as QEMU/MIPS mainatiner > > I was involved in KVM/Loongson development a bit and also intend to > help with mainline these works. > > After dealing with basic LS7A PCH kernel support, I'm going to > cooperate with Huacai and anyone who interested in to deal with > following stuff: > > - Basic QEMU/TCG support for Loongson64 instructions. > Well, it seems unrelated with KVM, but that would make > development easier with cross ISA emulation. I'm not going to > implement all the features like Loongson's page table fast walk > extension and binary translation extension but I'll ensure any > binary compiled with march=loongson3a can run flawlessly on > TCG. > > - Design of Loongson-VIRT QEMU machine > It is nearly impossible to bring a real Loongson system into > QEMU. Both RS780E and LS7A PCH have tons of unreasonable design > that would make the emulation extremely complex, Loongson > company's KVM implementation[1] has already proofed that, > thay're now in the hell. So we all agreed that we should build > a machine from draft. I think we should reuse existing infra as > far as possible to reduce our work load. I'm planing to use > pci-host-cam-generic together with VIRTIO PCI devices and a > a strip down version of loongson,liointc-1.0a to build a pure > PCI based system. But if any one have better idea please just > tell us, I'm still considering how to implement SMP-IPI and ACPI > stuff. > > - BIOS in VM > This has a lower priority. But BIOS is required to make a > emulated machine looks like a real machine. Loongson have their > open-sourced PMON and close-sourced UEFI(Based on tianocore). > I'd really with Loongson or Lemote will open-source their UEFI > but PMON is also a option. There will be an open source BIOS, we have completed 98%. > > Any kind of feedback is appreciated. > > Thanks. > > Wish you good health :-) > > > [1]: http://cgit.loongnix.org/cgit/linux-3.10/ & > http://cgit.loongnix.org/cgit/qemu-2.7.0/ > > Btw: I think Cc qemu-devel for the whole series is a little bit > disturb, probably we should only Cc qemu-devel for the cover letter. Sorrry, its my mistake. > > > > > Mike Rapoport(1): > > mips: define pud_index() regardless of page table folding > > > > Xing Li(2): > > KVM: MIPS: Define KVM_ENTRYHI_ASID to cpu_asid_mask(&boot_cpu_data) > > KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits > > > > Huacai Chen(12): > > KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16 > > KVM: MIPS: Add EVENTFD support which is needed by VHOST > > KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd > > KVM: MIPS: Introduce and use cpu_guest_has_ldpte > > KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 > > KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3 > > KVM: MIPS: Add more types of virtual interrupts > > KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support > > KVM: MIPS: Add CPUCFG emulation for Loongson-3 > > KVM: MIPS: Add CONFIG6 and DIAG registers emulation > > KVM: MIPS: Add more MMIO load/store instructions emulation > > KVM: MIPS: Enable KVM support for Loongson-3 > > > > Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx> > > --- > > arch/mips/Kconfig | 1 + > > arch/mips/include/asm/cpu-features.h | 3 + > > arch/mips/include/asm/kvm_host.h | 50 +++- > > arch/mips/include/asm/mipsregs.h | 7 + > > arch/mips/include/asm/pgtable-64.h | 4 +- > > arch/mips/include/uapi/asm/inst.h | 11 + > > arch/mips/kernel/cpu-probe.c | 2 + > > arch/mips/kvm/Kconfig | 1 + > > arch/mips/kvm/Makefile | 5 +- > > arch/mips/kvm/emulate.c | 461 > > ++++++++++++++++++++++++++++++++++- arch/mips/kvm/entry.c > > | 19 +- arch/mips/kvm/interrupt.c | 93 +------ > > arch/mips/kvm/interrupt.h | 14 +- > > arch/mips/kvm/loongson_ipi.c | 215 ++++++++++++++++ > > arch/mips/kvm/mips.c | 49 +++- > > arch/mips/kvm/tlb.c | 39 +++ > > arch/mips/kvm/trap_emul.c | 3 + > > arch/mips/kvm/vz.c | 204 +++++++++++----- > > 18 files changed, 1013 insertions(+), 168 deletions(-) > > create mode 100644 arch/mips/kvm/loongson_ipi.c > > -- > > 2.7.0 > Huacai
