Date:   Tue, 12 Sep 2023 17:47:51 +0800
From:   zhaotianrui <zhaotianrui@...ngson.cn>
To:     WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        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>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v20 28/30] LoongArch: KVM: Enable kvm config and add the
 makefile


在 2023/9/8 上午4:10, WANG Xuerui 写道:
>
> On 8/31/23 16:30, Tianrui Zhao wrote:
>> Enable LoongArch kvm config and add the makefile to support build kvm
>> module.
>>
>> Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Link: 
>> https://lore.kernel.org/oe-kbuild-all/202304131526.iXfLaVZc-lkp@intel.com/
>> Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
>> ---
>>   arch/loongarch/Kbuild                      |  1 +
>>   arch/loongarch/Kconfig                     |  3 ++
>>   arch/loongarch/configs/loongson3_defconfig |  2 +
>>   arch/loongarch/kvm/Kconfig                 | 45 ++++++++++++++++++++++
>>   arch/loongarch/kvm/Makefile                | 22 +++++++++++
>>   5 files changed, 73 insertions(+)
>>   create mode 100644 arch/loongarch/kvm/Kconfig
>>   create mode 100644 arch/loongarch/kvm/Makefile
>>
>> diff --git a/arch/loongarch/Kbuild b/arch/loongarch/Kbuild
>> index b01f5cdb27..40be8a1696 100644
>> --- a/arch/loongarch/Kbuild
>> +++ b/arch/loongarch/Kbuild
>> @@ -2,6 +2,7 @@ obj-y += kernel/
>>   obj-y += mm/
>>   obj-y += net/
>>   obj-y += vdso/
>> +obj-y += kvm/
> Do we want to keep the list alphabetically sorted here?
It could be resorted by alphabetical.
>>     # for cleaning
>>   subdir- += boot
>> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
>> index ecf282dee5..7f2f7ccc76 100644
>> --- a/arch/loongarch/Kconfig
>> +++ b/arch/loongarch/Kconfig
>> @@ -123,6 +123,7 @@ config LOONGARCH
>>       select HAVE_KPROBES
>>       select HAVE_KPROBES_ON_FTRACE
>>       select HAVE_KRETPROBES
>> +    select HAVE_KVM
>>       select HAVE_MOD_ARCH_SPECIFIC
>>       select HAVE_NMI
>>       select HAVE_PCI
>> @@ -650,3 +651,5 @@ source "kernel/power/Kconfig"
>>   source "drivers/acpi/Kconfig"
>>     endmenu
>> +
>> +source "arch/loongarch/kvm/Kconfig"
>> diff --git a/arch/loongarch/configs/loongson3_defconfig 
>> b/arch/loongarch/configs/loongson3_defconfig
>> index d64849b4cb..7acb4ae7af 100644
>> --- a/arch/loongarch/configs/loongson3_defconfig
>> +++ b/arch/loongarch/configs/loongson3_defconfig
>> @@ -63,6 +63,8 @@ CONFIG_EFI_ZBOOT=y
>>   CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER=y
>>   CONFIG_EFI_CAPSULE_LOADER=m
>>   CONFIG_EFI_TEST=m
>> +CONFIG_VIRTUALIZATION=y
>> +CONFIG_KVM=m
>>   CONFIG_MODULES=y
>>   CONFIG_MODULE_FORCE_LOAD=y
>>   CONFIG_MODULE_UNLOAD=y
>> diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
>> new file mode 100644
>> index 0000000000..bf7d6e7cde
>> --- /dev/null
>> +++ b/arch/loongarch/kvm/Kconfig
>> @@ -0,0 +1,45 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +#
>> +# KVM configuration
>> +#
>> +
>> +source "virt/kvm/Kconfig"
>> +
>> +menuconfig VIRTUALIZATION
>> +    bool "Virtualization"
>> +    help
>> +      Say Y here to get to see options for using your Linux host to run
>> +      other operating systems inside virtual machines (guests).
>> +      This option alone does not add any kernel code.
>> +
>> +      If you say N, all options in this submenu will be skipped and
>> +      disabled.
>> +
>> +if VIRTUALIZATION
>> +
>> +config AS_HAS_LVZ_EXTENSION
>> +    def_bool $(as-instr,hvcl 0)
>> +
>> +config KVM
>> +    tristate "Kernel-based Virtual Machine (KVM) support"
>> +    depends on HAVE_KVM
>> +    depends on AS_HAS_LVZ_EXTENSION
>> +    select MMU_NOTIFIER
>> +    select ANON_INODES
>> +    select PREEMPT_NOTIFIERS
>> +    select KVM_MMIO
>> +    select KVM_GENERIC_DIRTYLOG_READ_PROTECT
>> +    select KVM_GENERIC_HARDWARE_ENABLING
>> +    select KVM_XFER_TO_GUEST_WORK
>> +    select HAVE_KVM_DIRTY_RING_ACQ_REL
>> +    select HAVE_KVM_VCPU_ASYNC_IOCTL
>> +    select HAVE_KVM_EVENTFD
>> +    select SRCU
> Make the list of selects also alphabetically sorted?
It also could be resorted by alphabetical.
>> +    help
>> +      Support hosting virtualized guest machines using hardware
>> +      virtualization extensions. You will need a fairly processor
>> +      equipped with virtualization extensions.
>
> The word "fairly" seems extraneous here, and can be simply dropped.
Thanks, I will remove this "fairly" word.
>
> (I suppose you forgot to delete it after tweaking the original 
> sentence, that came from arch/x86/kvm: "You will need a fairly recent 
> processor ..." -- all LoongArch processors are recent!)
>
>> +
>> +      If unsure, say N.
>> +
>> +endif # VIRTUALIZATION
>> diff --git a/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
>> new file mode 100644
>> index 0000000000..2335e873a6
>> --- /dev/null
>> +++ b/arch/loongarch/kvm/Makefile
>> @@ -0,0 +1,22 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +#
>> +# Makefile for LOONGARCH KVM support
> "LoongArch" -- you may want to check the entire patch series for such 
> ALL-CAPS references to LoongArch in natural language paragraphs, they 
> all want to be spelled "LoongArch".
Thanks, I will fix it.
>> +#
>> +
>> +ccflags-y += -I $(srctree)/$(src)
>> +
>> +include $(srctree)/virt/kvm/Makefile.kvm
>> +
>> +obj-$(CONFIG_KVM) += kvm.o
>> +
>> +kvm-y += main.o
>> +kvm-y += vm.o
>> +kvm-y += vmid.o
>> +kvm-y += tlb.o
>> +kvm-y += mmu.o
>> +kvm-y += vcpu.o
>> +kvm-y += exit.o
>> +kvm-y += interrupt.o
>> +kvm-y += timer.o
>> +kvm-y += switch.o
>> +kvm-y += csr_ops.o
> I'd suggest sorting this list too to better avoid editing conflicts in 
> the future.
I will also resort them by alphabetical.

Thanks
Tianrui Zhao

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