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Message-ID: <3398bb30-a66a-c2ee-9f1f-da5e05db3a96@loongson.cn>
Date: Tue, 19 Sep 2023 13:07:29 +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 02/29] LoongArch: KVM: Implement kvm module related
interface
在 2023/9/19 上午10:41, Huacai Chen 写道:
> On Tue, Sep 19, 2023 at 10:38 AM zhaotianrui <zhaotianrui@...ngson.cn> wrote:
>>
>> 在 2023/9/17 下午12:21, Huacai Chen 写道:
>>> Hi, Tianrui,
>>>
>>> On Fri, Sep 15, 2023 at 9:50 AM Tianrui Zhao <zhaotianrui@...ngson.cn> wrote:
>>>> Implement LoongArch kvm module init, module exit interface,
>>>> using kvm context to save the vpid info and vcpu world switch
>>>> interface pointer.
>>>>
>>>> Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
>>>> Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
>>>> ---
>>>> arch/loongarch/kvm/main.c | 367 ++++++++++++++++++++++++++++++++++++++
>>>> 1 file changed, 367 insertions(+)
>>>> create mode 100644 arch/loongarch/kvm/main.c
>>>>
>>>> diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
>>>> new file mode 100644
>>>> index 0000000000..0deb9273d8
>>>> --- /dev/null
>>>> +++ b/arch/loongarch/kvm/main.c
>>>> @@ -0,0 +1,367 @@
>>>> +// SPDX-License-Identifier: GPL-2.0
>>>> +/*
>>>> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
>>>> + */
>>>> +
>>>> +#include <linux/err.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/kvm_host.h>
>>>> +#include <asm/cacheflush.h>
>>>> +#include <asm/cpufeature.h>
>>>> +#include <asm/kvm_csr.h>
>>>> +#include "trace.h"
>>>> +
>>>> +static struct kvm_context __percpu *vmcs;
>>>> +struct kvm_world_switch *kvm_loongarch_ops;
>>>> +unsigned long vpid_mask;
>>>> +static int gcsr_flag[CSR_MAX_NUMS];
>>>> +
>>>> +int get_gcsr_flag(int csr)
>>>> +{
>>>> + if (csr < CSR_MAX_NUMS)
>>>> + return gcsr_flag[csr];
>>>> +
>>>> + return INVALID_GCSR;
>>>> +}
>>>> +
>>>> +static inline void set_gcsr_sw_flag(int csr)
>>>> +{
>>>> + if (csr < CSR_MAX_NUMS)
>>>> + gcsr_flag[csr] |= SW_GCSR;
>>>> +}
>>>> +
>>>> +static inline void set_gcsr_hw_flag(int csr)
>>>> +{
>>>> + if (csr < CSR_MAX_NUMS)
>>>> + gcsr_flag[csr] |= HW_GCSR;
>>>> +}
>>>> +
>>>> +/*
>>>> + * The default value of gcsr_flag[CSR] is 0, and we use this
>>>> + * function to set the flag to 1(SW_GCSR) or 2(HW_GCSR) if the
>>>> + * gcsr is software or hardware. It will be used by get/set_gcsr,
>>>> + * if gcsr_flag is HW we should use gcsrrd/gcsrwr to access it,
>>>> + * else use sw csr to emulate it.
>>>> + */
>>>> +static void kvm_init_gcsr_flag(void)
>>>> +{
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_CRMD);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PRMD);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_EUEN);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_MISC);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_ECFG);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_ESTAT);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_ERA);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_BADV);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_BADI);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_EENTRY);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBIDX);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBEHI);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBELO0);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBELO1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_ASID);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PGDL);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PGDH);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PWCTL0);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PWCTL1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_STLBPGSIZE);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_RVACFG);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_CPUID);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG2);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG3);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS0);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS2);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS3);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS4);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS5);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS6);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_KS7);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TMID);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TCFG);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TVAL);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_CNTC);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_LLBCTL);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRENTRY);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRBADV);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRERA);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRSAVE);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRELO0);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRELO1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBREHI);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRPRMD);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN0);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN1);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN2);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN3);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_MWPS);
>>>> + set_gcsr_hw_flag(LOONGARCH_CSR_FWPS);
>>>> +
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IMPCTL1);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IMPCTL2);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRCTL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRINFO1);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRINFO2);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRENTRY);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRERA);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MERRSAVE);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_CTAG);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DEBUG);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DERA);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DESAVE);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG1);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG2);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG3);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PGD);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_TINTCLR);
>>>> +
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_FWPS);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_FWPC);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MWPS);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_MWPC);
>>>> +
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB0ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB0MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB0CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB0ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB1ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB1MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB1CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB1ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB2ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB2MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB2CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB2ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB3ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB3MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB3CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB3ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB4ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB4MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB4CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB4ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB5ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB5MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB5CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB5ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB6ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB6MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB6CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB6ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB7ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB7MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB7CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_DB7ASID);
>>>> +
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB0ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB0MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB0CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB0ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB1ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB1MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB1CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB1ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB2ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB2MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB2CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB2ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB3ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB3MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB3CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB3ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB4ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB4MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB4CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB4ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB5ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB5MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB5CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB5ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB6ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB6MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB6CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB6ASID);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB7ADDR);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB7MASK);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB7CTRL);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_IB7ASID);
>>>> +
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL0);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR0);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL1);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR1);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL2);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR2);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL3);
>>>> + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR3);
>>>> +}
>>>> +
>>>> +static void kvm_update_vpid(struct kvm_vcpu *vcpu, int cpu)
>>>> +{
>>>> + struct kvm_context *context;
>>>> + unsigned long vpid;
>>>> +
>>>> + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
>>>> + vpid = context->vpid_cache + 1;
>>>> + if (!(vpid & vpid_mask)) {
>>>> + /* finish round of 64 bit loop */
>>>> + if (unlikely(!vpid))
>>>> + vpid = vpid_mask + 1;
>>>> +
>>>> + /* vpid 0 reserved for root */
>>>> + ++vpid;
>>>> +
>>>> + /* start new vpid cycle */
>>>> + kvm_flush_tlb_all();
>>>> + }
>>>> +
>>>> + context->vpid_cache = vpid;
>>>> + vcpu->arch.vpid = vpid;
>>>> +}
>>>> +
>>>> +void kvm_check_vpid(struct kvm_vcpu *vcpu)
>>>> +{
>>>> + struct kvm_context *context;
>>>> + bool migrated;
>>>> + unsigned long ver, old, vpid;
>>>> + int cpu;
>>>> +
>>>> + cpu = smp_processor_id();
>>>> + /*
>>>> + * Are we entering guest context on a different CPU to last time?
>>>> + * If so, the vCPU's guest TLB state on this CPU may be stale.
>>>> + */
>>>> + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
>>>> + migrated = (vcpu->cpu != cpu);
>>>> +
>>>> + /*
>>>> + * Check if our vpid is of an older version
>>>> + *
>>>> + * We also discard the stored vpid if we've executed on
>>>> + * another CPU, as the guest mappings may have changed without
>>>> + * hypervisor knowledge.
>>>> + */
>>>> + ver = vcpu->arch.vpid & ~vpid_mask;
>>>> + old = context->vpid_cache & ~vpid_mask;
>>>> + if (migrated || (ver != old)) {
>>>> + kvm_update_vpid(vcpu, cpu);
>>>> + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid);
>>>> + vcpu->cpu = cpu;
>>>> + }
>>>> +
>>>> + /* Restore GSTAT(0x50).vpid */
>>>> + vpid = (vcpu->arch.vpid & vpid_mask) << CSR_GSTAT_GID_SHIFT;
>>>> + change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid);
>>>> +}
>>>> +
>>>> +static int kvm_loongarch_env_init(void)
>>>> +{
>>>> + struct kvm_context *context;
>>>> + int cpu, order;
>>>> + void *addr;
>>>> +
>>>> + vmcs = alloc_percpu(struct kvm_context);
>>>> + if (!vmcs) {
>>>> + pr_err("kvm: failed to allocate percpu kvm_context\n");
>>>> + return -ENOMEM;
>>>> + }
>>>> +
>>>> + kvm_loongarch_ops = kzalloc(sizeof(*kvm_loongarch_ops), GFP_KERNEL);
>>>> + if (!kvm_loongarch_ops) {
>>>> + free_percpu(vmcs);
>>>> + vmcs = NULL;
>>>> + return -ENOMEM;
>>>> + }
>>>> + /*
>>>> + * There will be problem in world switch code if there
>>>> + * is page fault reenter, since pgd register is shared
>>>> + * between root kernel and kvm hypervisor. World switch
>>>> + * entry need be unmapped area, cannot be tlb mapped area.
>>>> + * In future if hw pagetable walking is supported, or there
>>>> + * is separate pgd registers between root kernel and kvm
>>>> + * hypervisor, copying about world switch code will not be used.
>>>> + */
>>>> +
>>>> + order = get_order(kvm_vector_size + kvm_enter_guest_size);
>>>> + addr = (void *)__get_free_pages(GFP_KERNEL, order);
>>>> + if (!addr) {
>>>> + free_percpu(vmcs);
>>>> + vmcs = NULL;
>>>> + kfree(kvm_loongarch_ops);
>>>> + kvm_loongarch_ops = NULL;
>>>> + return -ENOMEM;
>>>> + }
>>>> +
>>>> + memcpy(addr, kvm_vector_entry, kvm_vector_size);
>>>> + memcpy(addr + kvm_vector_size, kvm_enter_guest, kvm_enter_guest_size);
>>> Why memcpy? In our internal repo, we use kvm_vector_entry and
>>> kvm_enter_guest directly. The long comments above make me nervous
>>> because Loongson-3A6000 already supports hardware pagetable walker.
>>>
>>> Huacai
>> As mentioned in the comments, it need not this memcpy if hardware page
>> walk is supported in 3A6000.
> But why in our internal repo we don't use memcpy() but kvm can still
> work on Loongson-3A5000?
>
> Huacai
Because in our internal repo, the KVM is build along with the linux
kernel, however, this KVM patch series is build in module.
Thanks
Tianrui Zhao
>
>> Thanks
>> Tianrui Zhao
>>>> + flush_icache_range((unsigned long)addr, (unsigned long)addr +
>>>> + kvm_vector_size + kvm_enter_guest_size);
>>>> + kvm_loongarch_ops->guest_eentry = addr;
>>>> + kvm_loongarch_ops->enter_guest = addr + kvm_vector_size;
>>>> + kvm_loongarch_ops->page_order = order;
>>>> +
>>>> + vpid_mask = read_csr_gstat();
>>>> + vpid_mask = (vpid_mask & CSR_GSTAT_GIDBIT) >> CSR_GSTAT_GIDBIT_SHIFT;
>>>> + if (vpid_mask)
>>>> + vpid_mask = GENMASK(vpid_mask - 1, 0);
>>>> +
>>>> + for_each_possible_cpu(cpu) {
>>>> + context = per_cpu_ptr(vmcs, cpu);
>>>> + context->vpid_cache = vpid_mask + 1;
>>>> + context->last_vcpu = NULL;
>>>> + }
>>>> +
>>>> + kvm_init_fault();
>>>> + kvm_init_gcsr_flag();
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static void kvm_loongarch_env_exit(void)
>>>> +{
>>>> + unsigned long addr;
>>>> +
>>>> + if (vmcs)
>>>> + free_percpu(vmcs);
>>>> +
>>>> + if (kvm_loongarch_ops) {
>>>> + if (kvm_loongarch_ops->guest_eentry) {
>>>> + addr = (unsigned long)kvm_loongarch_ops->guest_eentry;
>>>> + free_pages(addr, kvm_loongarch_ops->page_order);
>>>> + }
>>>> + kfree(kvm_loongarch_ops);
>>>> + }
>>>> +}
>>>> +
>>>> +static int kvm_loongarch_init(void)
>>>> +{
>>>> + int r;
>>>> +
>>>> + if (!cpu_has_lvz) {
>>>> + kvm_info("hardware virtualization not available\n");
>>>> + return -ENODEV;
>>>> + }
>>>> + r = kvm_loongarch_env_init();
>>>> + if (r)
>>>> + return r;
>>>> +
>>>> + return kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
>>>> +}
>>>> +
>>>> +static void kvm_loongarch_exit(void)
>>>> +{
>>>> + kvm_exit();
>>>> + kvm_loongarch_env_exit();
>>>> +}
>>>> +
>>>> +module_init(kvm_loongarch_init);
>>>> +module_exit(kvm_loongarch_exit);
>>>> +
>>>> +#ifdef MODULE
>>>> +static const struct cpu_feature loongarch_kvm_feature[] = {
>>>> + { .feature = cpu_feature(LOONGARCH_LVZ) },
>>>> + {},
>>>> +};
>>>> +MODULE_DEVICE_TABLE(cpu, loongarch_kvm_feature);
>>>> +#endif
>>>> --
>>>> 2.39.1
>>>>
>>
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