Hi Paolo & Huacai, Sorry to bother you, I do not know flow of kernel code reviewing and merging. I want to know who should give a reviewed-by comments for these piece of code about loongarch kvm patch. It should be kvm maintainer or LoongArch maintianer? And any suggestion is welcome. Regards Bibo, Mao 在 2023/5/15 10:14, Tianrui Zhao 写道: > This series adds KVM LoongArch support. Loongson 3A5000 supports hardware > assisted virtualization. With cpu virtualization, there are separate > hw-supported user mode and kernel mode in guest mode. With memory > virtualization, there are two-level hw mmu table for guest mode and host > mode. Also there is separate hw cpu timer with consant frequency in > guest mode, so that vm can migrate between hosts with different freq. > Currently, we are able to boot LoongArch Linux Guests. > > Few key aspects of KVM LoongArch added by this series are: > 1. Enable kvm hardware function when kvm module is loaded. > 2. Implement VM and vcpu related ioctl interface such as vcpu create, > vcpu run etc. GET_ONE_REG/SET_ONE_REG ioctl commands are use to > get general registers one by one. > 3. Hardware access about MMU, timer and csr are emulated in kernel. > 4. Hardwares such as mmio and iocsr device are emulated in user space > such as APIC, IPI, pci devices etc. > > The running environment of LoongArch virt machine: > 1. Cross tools to build kernel and uefi: > $ wget https://github.com/loongson/build-tools/releases/download/2022.09.06/loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz > tar -vxf loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz -C /opt > export PATH=/opt/cross-tools/bin:$PATH > export LD_LIBRARY_PATH=/opt/cross-tools/lib:$LD_LIBRARY_PATH > export LD_LIBRARY_PATH=/opt/cross-tools/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH > 2. This series is based on the linux source code: > https://github.com/loongson/linux-loongarch-kvm > Build command: > git checkout kvm-loongarch > make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig > make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- > 3. QEMU hypervisor with LoongArch supported: > https://github.com/loongson/qemu > Build command: > git checkout kvm-loongarch > ./configure --target-list="loongarch64-softmmu" --enable-kvm > make > 4. Uefi bios of LoongArch virt machine: > Link: https://github.com/tianocore/edk2-platforms/tree/master/Platform/Loongson/LoongArchQemuPkg#readme > 5. you can also access the binary files we have already build: > https://github.com/yangxiaojuan-loongson/qemu-binary > The command to boot loongarch virt machine: > $ qemu-system-loongarch64 -machine virt -m 4G -cpu la464 \ > -smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd ramdisk \ > -serial stdio -monitor telnet:localhost:4495,server,nowait \ > -append "root=/dev/ram rdinit=/sbin/init console=ttyS0,115200" \ > --nographic > > Changes for v10: > 1. Fix grammatical problems in LoongArch documentation. > 2. It is not necessary to save or restore the LOONGARCH_CSR_PGD when > vcpu put and vcpu load, so we remove it. > > Changes for v9: > 1. Apply the new defined interrupt number macros in loongarch.h to kvm, > such as INT_SWI0, INT_HWI0, INT_TI, INT_IPI, etc. And remove the > previous unused macros. > 2. Remove unused variables in kvm_vcpu_arch, and reorder the variables > to make them more standard. > > Changes for v8: > 1. Adjust the cpu_data.guest.options structure, add the ases flag into > it, and remove the previous guest.ases. We do this to keep consistent > with host cpu_data.options structure. > 2. Remove the "#include <asm/kvm_host.h>" in some files which also > include the "<linux/kvm_host.h>". As linux/kvm_host.h already include > the asm/kvm_host.h. > 3. Fix some unstandard spelling and grammar errors in comments, and > improve a little code format to make it easier and standard. > > Changes for v7: > 1. Fix the kvm_save/restore_hw_gcsr compiling warnings reported by > kernel test robot. The report link is: > https://lore.kernel.org/oe-kbuild-all/202304131526.iXfLaVZc-lkp@xxxxxxxxx/ > 2. Fix loongarch kvm trace related compiling problems. > > Changes for v6: > 1. Fix the Documentation/virt/kvm/api.rst compile warning about > loongarch parts. > > Changes for v5: > 1. Implement get/set mp_state ioctl interface, and only the > KVM_MP_STATE_RUNNABLE state is supported now, and other states > will be completed in the future. The state is also used when vcpu > run idle instruction, if vcpu state is changed to RUNNABLE, the > vcpu will have the possibility to be woken up. > 2. Supplement kvm document about loongarch-specific part, such as add > api introduction for GET/SET_ONE_REG, GET/SET_FPU, GET/SET_MP_STATE, > etc. > 3. Improve the kvm_switch_to_guest function in switch.S, remove the > previous tmp,tmp1 arguments and replace it with t0,t1 reg. > > Changes for v4: > 1. Add a csr_need_update flag in _vcpu_put, as most csr registers keep > unchanged during process context switch, so we need not to update it > every time. We can do this only if the soft csr is different form hardware. > That is to say all of csrs should update after vcpu enter guest, as for > set_csr_ioctl, we have written soft csr to keep consistent with hardware. > 2. Improve get/set_csr_ioctl interface, we set SW or HW or INVALID flag > for all csrs according to it's features when kvm init. In get/set_csr_ioctl, > if csr is HW, we use gcsrrd/ gcsrwr instruction to access it, else if csr is > SW, we use software to emulate it, and others return false. > 3. Add set_hw_gcsr function in csr_ops.S, and it is used in set_csr_ioctl. > We have splited hw gcsr into three parts, so we can calculate the code offset > by gcsrid and jump here to run the gcsrwr instruction. We use this function to > make the code easier and avoid to use the previous SET_HW_GCSR(XXX) interface. > 4. Improve kvm mmu functions, such as flush page table and make clean page table > interface. > > Changes for v3: > 1. Remove the vpid array list in kvm_vcpu_arch and use a vpid variable here, > because a vpid will never be recycled if a vCPU migrates from physical CPU A > to B and back to A. > 2. Make some constant variables in kvm_context to global such as vpid_mask, > guest_eentry, enter_guest, etc. > 3. Add some new tracepoints, such as kvm_trace_idle, kvm_trace_cache, > kvm_trace_gspr, etc. > 4. There are some duplicate codes in kvm_handle_exit and kvm_vcpu_run, > so we move it to a new function kvm_pre_enter_guest. > 5. Change the RESUME_HOST, RESUME_GUEST value, return 1 for resume guest > and "<= 0" for resume host. > 6. Fcsr and fpu registers are saved/restored together. > > Changes for v2: > 1. Seprate the original patch-01 and patch-03 into small patches, and the > patches mainly contain kvm module init, module exit, vcpu create, vcpu run, > etc. > 2. Remove the original KVM_{GET,SET}_CSRS ioctl in the kvm uapi header, > and we use the common KVM_{GET,SET}_ONE_REG to access register. > 3. Use BIT(x) to replace the "1 << n_bits" statement. > > Tianrui Zhao (30): > LoongArch: KVM: Add kvm related header files > LoongArch: KVM: Implement kvm module related interface > LoongArch: KVM: Implement kvm hardware enable, disable interface > LoongArch: KVM: Implement VM related functions > LoongArch: KVM: Add vcpu related header files > LoongArch: KVM: Implement vcpu create and destroy interface > LoongArch: KVM: Implement vcpu run interface > LoongArch: KVM: Implement vcpu handle exit interface > LoongArch: KVM: Implement vcpu get, vcpu set registers > LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface > LoongArch: KVM: Implement fpu related operations for vcpu > LoongArch: KVM: Implement vcpu interrupt operations > LoongArch: KVM: Implement misc vcpu related interfaces > LoongArch: KVM: Implement vcpu load and vcpu put operations > LoongArch: KVM: Implement vcpu status description > LoongArch: KVM: Implement update VM id function > LoongArch: KVM: Implement virtual machine tlb operations > LoongArch: KVM: Implement vcpu timer operations > LoongArch: KVM: Implement kvm mmu operations > LoongArch: KVM: Implement handle csr excption > LoongArch: KVM: Implement handle iocsr exception > LoongArch: KVM: Implement handle idle exception > LoongArch: KVM: Implement handle gspr exception > LoongArch: KVM: Implement handle mmio exception > LoongArch: KVM: Implement handle fpu exception > LoongArch: KVM: Implement kvm exception vector > LoongArch: KVM: Implement vcpu world switch > LoongArch: KVM: Implement probe virtualization when LoongArch cpu init > LoongArch: KVM: Enable kvm config and add the makefile > LoongArch: KVM: Supplement kvm document about LoongArch-specific part > > Documentation/virt/kvm/api.rst | 71 +- > arch/loongarch/Kbuild | 1 + > arch/loongarch/Kconfig | 2 + > arch/loongarch/configs/loongson3_defconfig | 2 + > arch/loongarch/include/asm/cpu-features.h | 22 + > arch/loongarch/include/asm/cpu-info.h | 10 + > arch/loongarch/include/asm/inst.h | 16 + > arch/loongarch/include/asm/kvm_csr.h | 57 ++ > arch/loongarch/include/asm/kvm_host.h | 252 ++++++ > arch/loongarch/include/asm/kvm_types.h | 11 + > arch/loongarch/include/asm/kvm_vcpu.h | 97 +++ > arch/loongarch/include/asm/loongarch.h | 211 ++++- > arch/loongarch/include/uapi/asm/kvm.h | 107 +++ > arch/loongarch/kernel/asm-offsets.c | 32 + > arch/loongarch/kernel/cpu-probe.c | 53 ++ > arch/loongarch/kvm/Kconfig | 38 + > arch/loongarch/kvm/Makefile | 22 + > arch/loongarch/kvm/csr_ops.S | 76 ++ > arch/loongarch/kvm/exit.c | 707 +++++++++++++++++ > arch/loongarch/kvm/interrupt.c | 126 +++ > arch/loongarch/kvm/main.c | 339 ++++++++ > arch/loongarch/kvm/mmu.c | 729 +++++++++++++++++ > arch/loongarch/kvm/switch.S | 301 +++++++ > arch/loongarch/kvm/timer.c | 266 +++++++ > arch/loongarch/kvm/tlb.c | 31 + > arch/loongarch/kvm/trace.h | 168 ++++ > arch/loongarch/kvm/vcpu.c | 880 +++++++++++++++++++++ > arch/loongarch/kvm/vm.c | 78 ++ > arch/loongarch/kvm/vmid.c | 64 ++ > include/uapi/linux/kvm.h | 9 + > 30 files changed, 4764 insertions(+), 14 deletions(-) > create mode 100644 arch/loongarch/include/asm/kvm_csr.h > create mode 100644 arch/loongarch/include/asm/kvm_host.h > create mode 100644 arch/loongarch/include/asm/kvm_types.h > create mode 100644 arch/loongarch/include/asm/kvm_vcpu.h > create mode 100644 arch/loongarch/include/uapi/asm/kvm.h > create mode 100644 arch/loongarch/kvm/Kconfig > create mode 100644 arch/loongarch/kvm/Makefile > create mode 100644 arch/loongarch/kvm/csr_ops.S > create mode 100644 arch/loongarch/kvm/exit.c > create mode 100644 arch/loongarch/kvm/interrupt.c > create mode 100644 arch/loongarch/kvm/main.c > create mode 100644 arch/loongarch/kvm/mmu.c > create mode 100644 arch/loongarch/kvm/switch.S > create mode 100644 arch/loongarch/kvm/timer.c > create mode 100644 arch/loongarch/kvm/tlb.c > create mode 100644 arch/loongarch/kvm/trace.h > create mode 100644 arch/loongarch/kvm/vcpu.c > create mode 100644 arch/loongarch/kvm/vm.c > create mode 100644 arch/loongarch/kvm/vmid.c >
