Hi, Tianrui, On Fri, Sep 15, 2023 at 2:58 PM zhaotianrui <zhaotianrui@xxxxxxxxxxx> wrote: > > > 在 2023/9/15 下午12:11, Huacai Chen 写道: > > Hi, Tianrui, > > > > On Fri, Sep 15, 2023 at 9:50 AM Tianrui Zhao <zhaotianrui@xxxxxxxxxxx> wrote: > >> 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 for building kernel and uefi: > >> https://github.com/loongson/build-tools > >> 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 > > When I build qemu, I get: > > [3/964] Compiling C object > > libqemu-loongarch64-softmmu.fa.p/target_loongarch_loongarch-qmp-cmds.c.o > > FAILED: libqemu-loongarch64-softmmu.fa.p/target_loongarch_loongarch-qmp-cmds.c.o > > cc -Ilibqemu-loongarch64-softmmu.fa.p -I. -I.. -Itarget/loongarch > > -I../target/loongarch -Isubprojects/dtc/libfdt > > -I../subprojects/dtc/libfdt -Iqapi -Itrace c > > In file included from ../target/loongarch/loongarch-qmp-cmds.c:11: > > ../target/loongarch/cpu.h:351:14: error: duplicate member 'CSR_CPUID' > > 351 | uint64_t CSR_CPUID; > > | ^~~~~~~~~ > > ninja: build stopped: subcommand failed. > > make[1]: *** [Makefile:162: run-ninja] Error 1 > > make[1]: Leaving directory '/root/qemu/build' > > make: *** [GNUmakefile:11: all] Error 2 > > > > Huacai > Sorry, I have submitted patch to fix this error, you could git pull to > update it. After git pull, I get a new error: [70/912] Compiling C object libqemu-loongarch64-softmmu.fa.p/accel_tcg_tcg-accel-ops-icount.c.o [71/912] Compiling C object libqemu-loongarch64-softmmu.fa.p/accel_tcg_tcg-accel-ops-rr.c.o [72/912] Linking target qemu-system-loongarch64 FAILED: qemu-system-loongarch64 cc -o qemu-system-loongarch64 libcommon.fa.p/hw_core_cpu-common.c.o libcommon.fa.p/hw_core_machine-smp.c.o libcommon.fa.p/gdbstub_syscalls.c.o libcommon.fap /usr/bin/ld: libqemu-loongarch64-softmmu.fa.p/accel_kvm_kvm-all.c.o: in function `kvm_init': /root/qemu/build/../accel/kvm/kvm-all.c:2525:(.text+0x66f4): undefined reference to `kvm_arch_get_default_type' collect2: error: ld returned 1 exit status ninja: build stopped: subcommand failed. make[1]: *** [Makefile:162: run-ninja] Error 1 make[1]: Leaving directory '/root/qemu/build' make: *** [GNUmakefile:11: all] Error 2 Huacai > > Thanks > Tianrui Zhao > > > >> 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 v21: > >> 1. Remove unnecessary prefix '_' in some kvm function names. > >> 2. Replace check_vmid with check_vpid, and move the functions > >> to main.c. > >> 3. Re-order the file names and config names by alphabetical > >> in KVM makefile and Kconfig. > >> 4. Code clean up for KVM mmu and get,set gcsr and vcpu_arch > >> ioctl functions. > >> > >> changes for v20: > >> 1. Remove the binary code of virtualization instructions in > >> insn_def.h and csr_ops.S and directly use the default csrrd, > >> csrwr,csrxchg instructions. And let CONFIG_KVM depends on the > >> AS_HAS_LVZ_EXTENSION, so we should use the binutils that have > >> already supported them to compile the KVM. This can make our > >> LoongArch KVM codes more maintainable and easier. > >> > >> changes for v19: > >> 1. Use the common interface xfer_to_guest_mode_handle_work to > >> Check conditions before entering the guest. > >> 2. Add vcpu dirty ring support. > >> > >> changes for v18: > >> 1. Code cleanup for vcpu timer: remove unnecessary timer_period_ns, > >> timer_bias, timer_dyn_bias variables in kvm_vcpu_arch and rename > >> the stable_ktime_saved variable to expire. > >> 2. Change the value of KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE to 40. > >> > >> changes for v17: > >> 1. Add CONFIG_AS_HAS_LVZ_EXTENSION config option which depends on > >> binutils that support LVZ assemble instruction. > >> 2. Change kvm mmu related functions, such as rename level2_ptw_pgd > >> to kvm_ptw_pgd, replace kvm_flush_range with kvm_ptw_pgd pagewalk > >> framework, replace kvm_arch.gpa_mm with kvm_arch.pgd, set > >> mark_page_dirty/kvm_set_pfn_dirty out of mmu_lock in kvm page fault > >> handling. > >> 3. Replace kvm_loongarch_interrupt with standard kvm_interrupt > >> when injecting IRQ. > >> 4. Replace vcpu_arch.last_exec_cpu with existing vcpu.cpu, remove > >> kvm_arch.online_vcpus and kvm_arch.is_migrating, > >> 5. Remove EXCCODE_TLBNR and EXCCODE_TLBNX in kvm exception table, > >> since NR/NX bit is not set in kvm page fault handling. > >> > >> Changes for v16: > >> 1. Free allocated memory of vmcs,kvm_loongarch_ops in kvm module init, > >> exit to avoid memory leak problem. > >> 2. Simplify some assemble codes in switch.S which are necessary to be > >> replaced with pseudo-instructions. And any other instructions do not need > >> to be replaced anymore. > >> 3. Add kvm_{save,restore}_guest_gprs macros to replace these ld.d,st.d > >> guest regs instructions when vcpu world switch. > >> 4. It is more secure to disable irq when flush guest tlb by gpa, so replace > >> preempt_disable with loacl_irq_save in kvm_flush_tlb_gpa. > >> > >> Changes for v15: > >> 1. Re-order some macros and variables in LoongArch kvm headers, put them > >> together which have the same meaning. > >> 2. Make some function definitions in one line, as it is not needed to split > >> them. > >> 3. Re-name some macros such as KVM_REG_LOONGARCH_GPR. > >> > >> Changes for v14: > >> 1. Remove the macro CONFIG_KVM_GENERIC_HARDWARE_ENABLING in > >> loongarch/kvm/main.c, as it is not useful. > >> 2. Add select KVM_GENERIC_HARDWARE_ENABLING in loongarch/kvm/Kconfig, > >> as it is used by virt/kvm. > >> 3. Fix the LoongArch KVM source link in MAINTAINERS. > >> 4. Improve LoongArch KVM documentation, such as add comment for > >> LoongArch kvm_regs. > >> > >> Changes for v13: > >> 1. Remove patch-28 "Implement probe virtualization when cpu init", as the > >> virtualization information about FPU,PMP,LSX in guest.options,options_dyn > >> is not used and the gcfg reg value can be read in kvm_hardware_enable, so > >> remove the previous cpu_probe_lvz function. > >> 2. Fix vcpu_enable_cap interface, it should return -EINVAL directly, as > >> FPU cap is enable by default, and do not support any other caps now. > >> 3. Simplify the jirl instruction with jr when without return addr, > >> simplify case HW0 ... HW7 statment in interrupt.c > >> 4. Rename host_stack,host_gp in kvm_vcpu_arch to host_sp,host_tp. > >> 5. Remove 'cpu' parameter in _kvm_check_requests, as 'cpu' is not used, > >> and remove 'cpu' parameter in kvm_check_vmid function, as it can get > >> cpu number by itself. > >> > >> Changes for v12: > >> 1. Improve the gcsr write/read/xchg interface to avoid the previous > >> instruction statment like parse_r and make the code easy understanding, > >> they are implemented in asm/insn-def.h and the instructions consistent > >> of "opcode" "rj" "rd" "simm14" arguments. > >> 2. Fix the maintainers list of LoongArch KVM. > >> > >> Changes for v11: > >> 1. Add maintainers for LoongArch KVM. > >> > >> 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 (29): > >> 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 virtual machine tlb operations > >> LoongArch: KVM: Implement vcpu timer operations > >> LoongArch: KVM: Implement kvm mmu operations > >> LoongArch: KVM: Implement handle csr exception > >> 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: Enable kvm config and add the makefile > >> LoongArch: KVM: Supplement kvm document about LoongArch-specific part > >> LoongArch: KVM: Add maintainers for LoongArch KVM > >> > >> Documentation/virt/kvm/api.rst | 70 +- > >> MAINTAINERS | 12 + > >> arch/loongarch/Kbuild | 1 + > >> arch/loongarch/Kconfig | 3 + > >> arch/loongarch/configs/loongson3_defconfig | 2 + > >> arch/loongarch/include/asm/inst.h | 16 + > >> arch/loongarch/include/asm/kvm_csr.h | 221 +++++ > >> arch/loongarch/include/asm/kvm_host.h | 245 ++++++ > >> arch/loongarch/include/asm/kvm_mmu.h | 138 +++ > >> arch/loongarch/include/asm/kvm_types.h | 11 + > >> arch/loongarch/include/asm/kvm_vcpu.h | 107 +++ > >> arch/loongarch/include/asm/loongarch.h | 19 +- > >> arch/loongarch/include/uapi/asm/kvm.h | 108 +++ > >> arch/loongarch/kernel/asm-offsets.c | 32 + > >> arch/loongarch/kvm/Kconfig | 45 + > >> arch/loongarch/kvm/Makefile | 20 + > >> arch/loongarch/kvm/exit.c | 711 ++++++++++++++++ > >> arch/loongarch/kvm/interrupt.c | 185 ++++ > >> arch/loongarch/kvm/main.c | 429 ++++++++++ > >> arch/loongarch/kvm/mmu.c | 922 ++++++++++++++++++++ > >> arch/loongarch/kvm/switch.S | 255 ++++++ > >> arch/loongarch/kvm/timer.c | 200 +++++ > >> arch/loongarch/kvm/tlb.c | 34 + > >> arch/loongarch/kvm/trace.h | 166 ++++ > >> arch/loongarch/kvm/vcpu.c | 940 +++++++++++++++++++++ > >> arch/loongarch/kvm/vm.c | 92 ++ > >> include/uapi/linux/kvm.h | 9 + > >> 27 files changed, 4979 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_mmu.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/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 > >> > >> -- > >> 2.39.1 > >> >
