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Message-ID: <23405391-1c54-bccb-ff4a-0ae096a042fa@loongson.cn>
Date: Tue, 9 Jul 2024 09:39:31 +0800
From: maobibo <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Tianrui Zhao <zhaotianrui@...ngson.cn>, Juergen Gross <jgross@...e.com>,
kvm@...r.kernel.org, loongarch@...ts.linux.dev,
linux-kernel@...r.kernel.org, x86@...nel.org, virtualization@...ts.linux.dev
Subject: Re: [PATCH v4 1/2] LoongArch: KVM: Add steal time support in kvm side
On 2024/7/8 下午5:47, Huacai Chen wrote:
> On Mon, Jul 8, 2024 at 9:16 AM maobibo <maobibo@...ngson.cn> wrote:
>>
>>
>>
>> On 2024/7/6 下午5:41, Huacai Chen wrote:
>>> On Sat, Jul 6, 2024 at 2:59 PM maobibo <maobibo@...ngson.cn> wrote:
>>>>
>>>> Huacai,
>>>>
>>>> On 2024/7/6 上午11:00, Huacai Chen wrote:
>>>>> Hi, Bibo,
>>>>>
>>>>> On Fri, May 24, 2024 at 3:38 PM Bibo Mao <maobibo@...ngson.cn> wrote:
>>>>>>
>>>>>> Steal time feature is added here in kvm side, VM can search supported
>>>>>> features provided by KVM hypervisor, feature KVM_FEATURE_STEAL_TIME
>>>>>> is added here. Like x86, steal time structure is saved in guest memory,
>>>>>> one hypercall function KVM_HCALL_FUNC_NOTIFY is added to notify KVM to
>>>>>> enable the feature.
>>>>>>
>>>>>> One cpu attr ioctl command KVM_LOONGARCH_VCPU_PVTIME_CTRL is added to
>>>>>> save and restore base address of steal time structure when VM is migrated.
>>>>>>
>>>>>> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
>>>>>> ---
>>>>>> arch/loongarch/include/asm/kvm_host.h | 7 ++
>>>>>> arch/loongarch/include/asm/kvm_para.h | 10 ++
>>>>>> arch/loongarch/include/asm/kvm_vcpu.h | 4 +
>>>>>> arch/loongarch/include/asm/loongarch.h | 1 +
>>>>>> arch/loongarch/include/uapi/asm/kvm.h | 4 +
>>>>>> arch/loongarch/kvm/Kconfig | 1 +
>>>>>> arch/loongarch/kvm/exit.c | 38 +++++++-
>>>>>> arch/loongarch/kvm/vcpu.c | 124 +++++++++++++++++++++++++
>>>>>> 8 files changed, 187 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
>>>>>> index c87b6ea0ec47..2eb2f7572023 100644
>>>>>> --- a/arch/loongarch/include/asm/kvm_host.h
>>>>>> +++ b/arch/loongarch/include/asm/kvm_host.h
>>>>>> @@ -30,6 +30,7 @@
>>>>>> #define KVM_PRIVATE_MEM_SLOTS 0
>>>>>>
>>>>>> #define KVM_HALT_POLL_NS_DEFAULT 500000
>>>>>> +#define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(1)
>>>>>>
>>>>>> #define KVM_GUESTDBG_SW_BP_MASK \
>>>>>> (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)
>>>>>> @@ -201,6 +202,12 @@ struct kvm_vcpu_arch {
>>>>>> struct kvm_mp_state mp_state;
>>>>>> /* cpucfg */
>>>>>> u32 cpucfg[KVM_MAX_CPUCFG_REGS];
>>>>>> + /* paravirt steal time */
>>>>>> + struct {
>>>>>> + u64 guest_addr;
>>>>>> + u64 last_steal;
>>>>>> + struct gfn_to_hva_cache cache;
>>>>>> + } st;
>>>>>> };
>>>>>>
>>>>>> static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int reg)
>>>>>> diff --git a/arch/loongarch/include/asm/kvm_para.h b/arch/loongarch/include/asm/kvm_para.h
>>>>>> index 4ba2312e5f8c..a9ba8185d4af 100644
>>>>>> --- a/arch/loongarch/include/asm/kvm_para.h
>>>>>> +++ b/arch/loongarch/include/asm/kvm_para.h
>>>>>> @@ -14,6 +14,7 @@
>>>>>>
>>>>>> #define KVM_HCALL_SERVICE HYPERCALL_ENCODE(HYPERVISOR_KVM, KVM_HCALL_CODE_SERVICE)
>>>>>> #define KVM_HCALL_FUNC_IPI 1
>>>>>> +#define KVM_HCALL_FUNC_NOTIFY 2
>>>>>>
>>>>>> #define KVM_HCALL_SWDBG HYPERCALL_ENCODE(HYPERVISOR_KVM, KVM_HCALL_CODE_SWDBG)
>>>>>>
>>>>>> @@ -24,6 +25,15 @@
>>>>>> #define KVM_HCALL_INVALID_CODE -1UL
>>>>>> #define KVM_HCALL_INVALID_PARAMETER -2UL
>>>>>>
>>>>>> +#define KVM_STEAL_PHYS_VALID BIT_ULL(0)
>>>>>> +#define KVM_STEAL_PHYS_MASK GENMASK_ULL(63, 6)
>>>>>> +struct kvm_steal_time {
>>>>>> + __u64 steal;
>>>>>> + __u32 version;
>>>>>> + __u32 flags;
>>>>> I found that x86 has a preempted field here, in our internal repo the
>>>>> LoongArch version also has this field. Moreover,
>>>>> kvm_steal_time_set_preempted() and kvm_steal_time_clear_preempted()
>>>>> seems needed.
>>>> By my understanding, macro vcpu_is_preempted() is used together with pv
>>>> spinlock, and pv spinlock depends on pv stealtime. So I think preempted
>>>> flag is not part of pv stealtime, it is part of pv spinlock.
>>>>
>>>> We are going to add preempted field if pv spinlock is added.
>>>>>
>>>>>> + __u32 pad[12];
>>>>>> +};
>>>>>> +
>>>>>> /*
>>>>>> * Hypercall interface for KVM hypervisor
>>>>>> *
>>>>>> diff --git a/arch/loongarch/include/asm/kvm_vcpu.h b/arch/loongarch/include/asm/kvm_vcpu.h
>>>>>> index 590a92cb5416..d7e51300a89f 100644
>>>>>> --- a/arch/loongarch/include/asm/kvm_vcpu.h
>>>>>> +++ b/arch/loongarch/include/asm/kvm_vcpu.h
>>>>>> @@ -120,4 +120,8 @@ static inline void kvm_write_reg(struct kvm_vcpu *vcpu, int num, unsigned long v
>>>>>> vcpu->arch.gprs[num] = val;
>>>>>> }
>>>>>>
>>>>>> +static inline bool kvm_pvtime_supported(void)
>>>>>> +{
>>>>>> + return !!sched_info_on();
>>>>>> +}
>>>>>> #endif /* __ASM_LOONGARCH_KVM_VCPU_H__ */
>>>>>> diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
>>>>>> index eb09adda54b7..7a4633ef284b 100644
>>>>>> --- a/arch/loongarch/include/asm/loongarch.h
>>>>>> +++ b/arch/loongarch/include/asm/loongarch.h
>>>>>> @@ -169,6 +169,7 @@
>>>>>> #define KVM_SIGNATURE "KVM\0"
>>>>>> #define CPUCFG_KVM_FEATURE (CPUCFG_KVM_BASE + 4)
>>>>>> #define KVM_FEATURE_IPI BIT(1)
>>>>>> +#define KVM_FEATURE_STEAL_TIME BIT(2)
>>>>>>
>>>>>> #ifndef __ASSEMBLY__
>>>>>>
>>>>>> diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h
>>>>>> index f9abef382317..ddc5cab0ffd0 100644
>>>>>> --- a/arch/loongarch/include/uapi/asm/kvm.h
>>>>>> +++ b/arch/loongarch/include/uapi/asm/kvm.h
>>>>>> @@ -81,7 +81,11 @@ struct kvm_fpu {
>>>>>> #define LOONGARCH_REG_64(TYPE, REG) (TYPE | KVM_REG_SIZE_U64 | (REG << LOONGARCH_REG_SHIFT))
>>>>>> #define KVM_IOC_CSRID(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CSR, REG)
>>>>>> #define KVM_IOC_CPUCFG(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CPUCFG, REG)
>>>>>> +
>>>>>> +/* Device Control API on vcpu fd */
>>>>>> #define KVM_LOONGARCH_VCPU_CPUCFG 0
>>>>>> +#define KVM_LOONGARCH_VCPU_PVTIME_CTRL 1
>>>>>> +#define KVM_LOONGARCH_VCPU_PVTIME_GPA 0
>>>>>>
>>>>>> struct kvm_debug_exit_arch {
>>>>>> };
>>>>>> diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
>>>>>> index c4ef2b4d9797..248744b4d086 100644
>>>>>> --- a/arch/loongarch/kvm/Kconfig
>>>>>> +++ b/arch/loongarch/kvm/Kconfig
>>>>>> @@ -29,6 +29,7 @@ config KVM
>>>>>> select KVM_MMIO
>>>>>> select HAVE_KVM_READONLY_MEM
>>>>>> select KVM_XFER_TO_GUEST_WORK
>>>>>> + select SCHED_INFO
>>>>>> help
>>>>>> Support hosting virtualized guest machines using
>>>>>> hardware virtualization extensions. You will need
>>>>>> diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
>>>>>> index c86e099af5ca..e2abd97fb13f 100644
>>>>>> --- a/arch/loongarch/kvm/exit.c
>>>>>> +++ b/arch/loongarch/kvm/exit.c
>>>>>> @@ -24,7 +24,7 @@
>>>>>> static int kvm_emu_cpucfg(struct kvm_vcpu *vcpu, larch_inst inst)
>>>>>> {
>>>>>> int rd, rj;
>>>>>> - unsigned int index;
>>>>>> + unsigned int index, ret;
>>>>>>
>>>>>> if (inst.reg2_format.opcode != cpucfg_op)
>>>>>> return EMULATE_FAIL;
>>>>>> @@ -50,7 +50,10 @@ static int kvm_emu_cpucfg(struct kvm_vcpu *vcpu, larch_inst inst)
>>>>>> vcpu->arch.gprs[rd] = *(unsigned int *)KVM_SIGNATURE;
>>>>>> break;
>>>>>> case CPUCFG_KVM_FEATURE:
>>>>>> - vcpu->arch.gprs[rd] = KVM_FEATURE_IPI;
>>>>>> + ret = KVM_FEATURE_IPI;
>>>>>> + if (sched_info_on())
>>>>> What about replacing it with your helper function kvm_pvtime_supported()?
>>>> Sure, will replace it with helper function kvm_pvtime_supported().
>>> If you are sure this is the only issue, then needn't submit a new version.
>> OK, thanks.
>>
>> By searching orginal submit of vcpu_is_preempt(), it can be located at
>> https://lore.kernel.org/lkml/1477642287-24104-1-git-send-email-xinhui.pan@linux.vnet.ibm.com/
>>
>> It is separated one, only that is depends on pv-spinlock and
>> pv-stealtime. And there is no capability indicator for guest kernel, it
>> is enabled by default.
> Series applied with some modifications here, you can double-check the
> correctness.
> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-kvm
Huacai,
I download and test. The stealtime works for me.
Regards
Bibo Mao
>
> Huacai
>>
>> Regards
>> Bibo Mao
>>
>>>
>>> Huacai
>>>
>>>>
>>>> Regards
>>>> Bibo Mao
>>>>>
>>>>> Huacai
>>>>>
>>>>>> + ret |= KVM_FEATURE_STEAL_TIME;
>>>>>> + vcpu->arch.gprs[rd] = ret;
>>>>>> break;
>>>>>> default:
>>>>>> vcpu->arch.gprs[rd] = 0;
>>>>>> @@ -687,6 +690,34 @@ static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
>>>>>> return RESUME_GUEST;
>>>>>> }
>>>>>>
>>>>>> +static long kvm_save_notify(struct kvm_vcpu *vcpu)
>>>>>> +{
>>>>>> + unsigned long id, data;
>>>>>> +
>>>>>> + id = kvm_read_reg(vcpu, LOONGARCH_GPR_A1);
>>>>>> + data = kvm_read_reg(vcpu, LOONGARCH_GPR_A2);
>>>>>> + switch (id) {
>>>>>> + case KVM_FEATURE_STEAL_TIME:
>>>>>> + if (!kvm_pvtime_supported())
>>>>>> + return KVM_HCALL_INVALID_CODE;
>>>>>> +
>>>>>> + if (data & ~(KVM_STEAL_PHYS_MASK | KVM_STEAL_PHYS_VALID))
>>>>>> + return KVM_HCALL_INVALID_PARAMETER;
>>>>>> +
>>>>>> + vcpu->arch.st.guest_addr = data;
>>>>>> + if (!(data & KVM_STEAL_PHYS_VALID))
>>>>>> + break;
>>>>>> +
>>>>>> + vcpu->arch.st.last_steal = current->sched_info.run_delay;
>>>>>> + kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>>>>>> + break;
>>>>>> + default:
>>>>>> + break;
>>>>>> + };
>>>>>> +
>>>>>> + return 0;
>>>>>> +};
>>>>>> +
>>>>>> /*
>>>>>> * kvm_handle_lsx_disabled() - Guest used LSX while disabled in root.
>>>>>> * @vcpu: Virtual CPU context.
>>>>>> @@ -758,6 +789,9 @@ static void kvm_handle_service(struct kvm_vcpu *vcpu)
>>>>>> kvm_send_pv_ipi(vcpu);
>>>>>> ret = KVM_HCALL_SUCCESS;
>>>>>> break;
>>>>>> + case KVM_HCALL_FUNC_NOTIFY:
>>>>>> + ret = kvm_save_notify(vcpu);
>>>>>> + break;
>>>>>> default:
>>>>>> ret = KVM_HCALL_INVALID_CODE;
>>>>>> break;
>>>>>> diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
>>>>>> index 9e8030d45129..382796f1d3e6 100644
>>>>>> --- a/arch/loongarch/kvm/vcpu.c
>>>>>> +++ b/arch/loongarch/kvm/vcpu.c
>>>>>> @@ -31,6 +31,117 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
>>>>>> sizeof(kvm_vcpu_stats_desc),
>>>>>> };
>>>>>>
>>>>>> +static void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
>>>>>> +{
>>>>>> + struct kvm_steal_time __user *st;
>>>>>> + struct gfn_to_hva_cache *ghc;
>>>>>> + struct kvm_memslots *slots;
>>>>>> + gpa_t gpa;
>>>>>> + u64 steal;
>>>>>> + u32 version;
>>>>>> +
>>>>>> + ghc = &vcpu->arch.st.cache;
>>>>>> + gpa = vcpu->arch.st.guest_addr;
>>>>>> + if (!(gpa & KVM_STEAL_PHYS_VALID))
>>>>>> + return;
>>>>>> +
>>>>>> + gpa &= KVM_STEAL_PHYS_MASK;
>>>>>> + slots = kvm_memslots(vcpu->kvm);
>>>>>> + if (slots->generation != ghc->generation || gpa != ghc->gpa) {
>>>>>> + if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, gpa,
>>>>>> + sizeof(*st))) {
>>>>>> + ghc->gpa = INVALID_GPA;
>>>>>> + return;
>>>>>> + }
>>>>>> + }
>>>>>> +
>>>>>> + st = (struct kvm_steal_time __user *)ghc->hva;
>>>>>> + unsafe_get_user(version, &st->version, out);
>>>>>> + if (version & 1)
>>>>>> + version += 1;
>>>>>> + version += 1;
>>>>>> + unsafe_put_user(version, &st->version, out);
>>>>>> + smp_wmb();
>>>>>> +
>>>>>> + unsafe_get_user(steal, &st->steal, out);
>>>>>> + steal += current->sched_info.run_delay -
>>>>>> + vcpu->arch.st.last_steal;
>>>>>> + vcpu->arch.st.last_steal = current->sched_info.run_delay;
>>>>>> + unsafe_put_user(steal, &st->steal, out);
>>>>>> +
>>>>>> + smp_wmb();
>>>>>> + version += 1;
>>>>>> + unsafe_put_user(version, &st->version, out);
>>>>>> +out:
>>>>>> + mark_page_dirty_in_slot(vcpu->kvm, ghc->memslot, gpa_to_gfn(ghc->gpa));
>>>>>> +}
>>>>>> +
>>>>>> +static int kvm_loongarch_pvtime_has_attr(struct kvm_vcpu *vcpu,
>>>>>> + struct kvm_device_attr *attr)
>>>>>> +{
>>>>>> + if (!kvm_pvtime_supported() ||
>>>>>> + attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
>>>>>> + return -ENXIO;
>>>>>> +
>>>>>> + return 0;
>>>>>> +}
>>>>>> +
>>>>>> +static int kvm_loongarch_pvtime_get_attr(struct kvm_vcpu *vcpu,
>>>>>> + struct kvm_device_attr *attr)
>>>>>> +{
>>>>>> + u64 __user *user = (u64 __user *)attr->addr;
>>>>>> + u64 gpa;
>>>>>> +
>>>>>> + if (!kvm_pvtime_supported() ||
>>>>>> + attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
>>>>>> + return -ENXIO;
>>>>>> +
>>>>>> + gpa = vcpu->arch.st.guest_addr;
>>>>>> + if (put_user(gpa, user))
>>>>>> + return -EFAULT;
>>>>>> +
>>>>>> + return 0;
>>>>>> +}
>>>>>> +
>>>>>> +static int kvm_loongarch_pvtime_set_attr(struct kvm_vcpu *vcpu,
>>>>>> + struct kvm_device_attr *attr)
>>>>>> +{
>>>>>> + u64 __user *user = (u64 __user *)attr->addr;
>>>>>> + struct kvm *kvm = vcpu->kvm;
>>>>>> + u64 gpa;
>>>>>> + int ret = 0;
>>>>>> + int idx;
>>>>>> +
>>>>>> + if (!kvm_pvtime_supported() ||
>>>>>> + attr->attr != KVM_LOONGARCH_VCPU_PVTIME_GPA)
>>>>>> + return -ENXIO;
>>>>>> +
>>>>>> + if (get_user(gpa, user))
>>>>>> + return -EFAULT;
>>>>>> +
>>>>>> + if (gpa & ~(KVM_STEAL_PHYS_MASK | KVM_STEAL_PHYS_VALID))
>>>>>> + return -EINVAL;
>>>>>> +
>>>>>> + if (!(gpa & KVM_STEAL_PHYS_VALID)) {
>>>>>> + vcpu->arch.st.guest_addr = gpa;
>>>>>> + return 0;
>>>>>> + }
>>>>>> +
>>>>>> + /* Check the address is in a valid memslot */
>>>>>> + idx = srcu_read_lock(&kvm->srcu);
>>>>>> + if (kvm_is_error_hva(gfn_to_hva(kvm, gpa >> PAGE_SHIFT)))
>>>>>> + ret = -EINVAL;
>>>>>> + srcu_read_unlock(&kvm->srcu, idx);
>>>>>> +
>>>>>> + if (!ret) {
>>>>>> + vcpu->arch.st.guest_addr = gpa;
>>>>>> + vcpu->arch.st.last_steal = current->sched_info.run_delay;
>>>>>> + kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>>>>>> + }
>>>>>> +
>>>>>> + return ret;
>>>>>> +}
>>>>>> +
>>>>>> /*
>>>>>> * kvm_check_requests - check and handle pending vCPU requests
>>>>>> *
>>>>>> @@ -48,6 +159,9 @@ static int kvm_check_requests(struct kvm_vcpu *vcpu)
>>>>>> if (kvm_dirty_ring_check_request(vcpu))
>>>>>> return RESUME_HOST;
>>>>>>
>>>>>> + if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
>>>>>> + kvm_update_stolen_time(vcpu);
>>>>>> +
>>>>>> return RESUME_GUEST;
>>>>>> }
>>>>>>
>>>>>> @@ -671,6 +785,9 @@ static int kvm_loongarch_vcpu_has_attr(struct kvm_vcpu *vcpu,
>>>>>> case KVM_LOONGARCH_VCPU_CPUCFG:
>>>>>> ret = kvm_loongarch_cpucfg_has_attr(vcpu, attr);
>>>>>> break;
>>>>>> + case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
>>>>>> + ret = kvm_loongarch_pvtime_has_attr(vcpu, attr);
>>>>>> + break;
>>>>>> default:
>>>>>> break;
>>>>>> }
>>>>>> @@ -703,6 +820,9 @@ static int kvm_loongarch_vcpu_get_attr(struct kvm_vcpu *vcpu,
>>>>>> case KVM_LOONGARCH_VCPU_CPUCFG:
>>>>>> ret = kvm_loongarch_get_cpucfg_attr(vcpu, attr);
>>>>>> break;
>>>>>> + case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
>>>>>> + ret = kvm_loongarch_pvtime_get_attr(vcpu, attr);
>>>>>> + break;
>>>>>> default:
>>>>>> break;
>>>>>> }
>>>>>> @@ -725,6 +845,9 @@ static int kvm_loongarch_vcpu_set_attr(struct kvm_vcpu *vcpu,
>>>>>> case KVM_LOONGARCH_VCPU_CPUCFG:
>>>>>> ret = kvm_loongarch_cpucfg_set_attr(vcpu, attr);
>>>>>> break;
>>>>>> + case KVM_LOONGARCH_VCPU_PVTIME_CTRL:
>>>>>> + ret = kvm_loongarch_pvtime_set_attr(vcpu, attr);
>>>>>> + break;
>>>>>> default:
>>>>>> break;
>>>>>> }
>>>>>> @@ -1084,6 +1207,7 @@ static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>>>>>>
>>>>>> /* Control guest page CCA attribute */
>>>>>> change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT);
>>>>>> + kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>>>>>>
>>>>>> /* Don't bother restoring registers multiple times unless necessary */
>>>>>> if (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE)
>>>>>> --
>>>>>> 2.39.3
>>>>>>
>>>>
>>
>>
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