Message-ID: <1f13e290-4655-99c2-7edd-d62c71e13498@loongson.cn>
Date:   Sat, 16 Sep 2023 14:29:47 +0800
From:   zhaotianrui <zhaotianrui@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
        Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH v21 00/29] Add KVM LoongArch support


在 2023/9/16 上午11:17, Huacai Chen 写道:
> Hi, Tianrui,
>
> On Fri, Sep 15, 2023 at 3:53 PM zhaotianrui <zhaotianrui@...ngson.cn> wrote:
>>
>> 在 2023/9/15 下午3:10, Huacai Chen 写道:
>>> Hi, Tianrui,
>>>
>>> On Fri, Sep 15, 2023 at 2:58 PM zhaotianrui <zhaotianrui@...ngson.cn> 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@...ngson.cn> 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
>> Sorry, I have resolved this mistake and submit to the source, you could
>> update it.
> I can test now, during my tests I may ask some other questions about
> your patches. You just need to answer my questions and I will adjust
> the code myself if needed. After that I will give you a final version
> with Tested-by and you can simply send that as V22.
>
> Huacai
Ok, thanks for your reviewing carefully.

Thanks
Tianrui Zhao
>
>> Thanks
>> Tianrui Zhao
>>>> 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@intel.com/
>>>>>> 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
>>>>>>

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