Re: [PATCH v20 28/30] LoongArch: KVM: Enable kvm config and add the makefile
From: bibo mao
Date: Thu Sep 07 2023 - 21:50:00 EST
在 2023/9/8 09:40, Huacai Chen 写道:
> On Fri, Sep 8, 2023 at 4:10 AM WANG Xuerui <kernel@xxxxxxxxxx> wrote:
>>
>>
>> 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@xxxxxxxxxxx>
>>> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>>> Link: https://lore.kernel.org/oe-kbuild-all/202304131526.iXfLaVZc-lkp@xxxxxxxxx/
>>> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
>>> ---
>>> 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?
> kvm directory can be at last, but I'm afraid that it should be
>
> ifdef CONFIG_KVM
> obj-y += kvm/
> endif
Agree, how about this like other architectures.
obj-$(CONFIG_KVM) += kvm/
>
> If such a guard is unnecessary, then I agree to use alphabetical order.
Is there any document about "alphabetical order"? I check Kbuild in other
directories, it is not sorted by alphabetical order.
$ cat arch/riscv/Kbuild
obj-y += kernel/ mm/ net/
obj-$(CONFIG_BUILTIN_DTB) += boot/dts/
obj-y += errata/
obj-$(CONFIG_KVM) += kvm/
obj-$(CONFIG_ARCH_HAS_KEXEC_PURGATORY) += purgatory/
# for cleaning
subdir- += boot
$ cat arch/arm64/Kbuild
obj-y += kernel/ mm/ net/
obj-$(CONFIG_KVM) += kvm/
obj-$(CONFIG_XEN) += xen/
obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/
obj-$(CONFIG_CRYPTO) += crypto/
# for cleaning
subdir- += boot
Regards
Bibo Mao
>
> Huacai
>
>>>
>>> # 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?
>>> + 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.
>>
>> (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".
>>> +#
>>> +
>>> +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.
>>
>> --
>> WANG "xen0n" Xuerui
>>
>> Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/
>>
>>