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Date: Thu, 16 Feb 2017 18:07:26 +0100
From: Radim Krčmář <rkrcmar@...hat.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
"Cao, Lei" <Lei.Cao@...atus.com>
Subject: Re: [PATCH 3/3] KVM: Support vCPU-based gfn->hva cache
2017-02-15 23:00+0100, Paolo Bonzini:
> From: "Cao, Lei" <Lei.Cao@...atus.com>
>
> Provide versions of struct gfn_to_hva_cache functions that
> take vcpu as a parameter instead of struct kvm. The existing functions
> are not needed anymore, so delete them. This allows dirty pages to
> be logged in the vcpu dirty ring, instead of the global dirty ring,
> for ring-based dirty memory tracking.
>
> Signed-off-by: Lei Cao <lei.cao@...atus.com>
> Message-Id: <CY1PR08MB19929BD2AC47A291FD680E83F04F0@...PR08MB1992.namprd08.prod.outlook.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
Reviewd-by: Radim Krčmář <rkrcmar@...hat.com>
> arch/x86/kvm/lapic.c | 22 ++++++++++------------
> arch/x86/kvm/x86.c | 41 ++++++++++++++++++++---------------------
> include/linux/kvm_host.h | 16 ++++++++--------
> virt/kvm/kvm_main.c | 34 +++++++++++++++++-----------------
> 4 files changed, 55 insertions(+), 58 deletions(-)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 9fa5b8164961..acf959441778 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -529,16 +529,14 @@ int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
>
> static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
> {
> -
> - return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
> - sizeof(val));
> + return kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.pv_eoi.data, &val,
> + sizeof(val));
> }
>
> static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
> {
> -
> - return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
> - sizeof(*val));
> + return kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.pv_eoi.data, val,
> + sizeof(*val));
> }
>
> static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
> @@ -2287,8 +2285,8 @@ void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
> if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
> return;
>
> - if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
> - sizeof(u32)))
> + if (kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.apic->vapic_cache, &data,
> + sizeof(u32)))
> return;
>
> apic_set_tpr(vcpu->arch.apic, data & 0xff);
> @@ -2340,14 +2338,14 @@ void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
> max_isr = 0;
> data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
>
> - kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
> - sizeof(u32));
> + kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.apic->vapic_cache, &data,
> + sizeof(u32));
> }
>
> int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
> {
> if (vapic_addr) {
> - if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
> + if (kvm_vcpu_gfn_to_hva_cache_init(vcpu,
> &vcpu->arch.apic->vapic_cache,
> vapic_addr, sizeof(u32)))
> return -EINVAL;
> @@ -2441,7 +2439,7 @@ int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
> vcpu->arch.pv_eoi.msr_val = data;
> if (!pv_eoi_enabled(vcpu))
> return 0;
> - return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
> + return kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.pv_eoi.data,
> addr, sizeof(u8));
> }
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 2a0974383ffe..8d3047c8cce7 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1811,7 +1811,7 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
> struct kvm_vcpu_arch *vcpu = &v->arch;
> struct pvclock_vcpu_time_info guest_hv_clock;
>
> - if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
> + if (unlikely(kvm_vcpu_read_guest_cached(v, &vcpu->pv_time,
> &guest_hv_clock, sizeof(guest_hv_clock))))
> return;
>
> @@ -1832,9 +1832,9 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
> BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0);
>
> vcpu->hv_clock.version = guest_hv_clock.version + 1;
> - kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
> - &vcpu->hv_clock,
> - sizeof(vcpu->hv_clock.version));
> + kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
> + &vcpu->hv_clock,
> + sizeof(vcpu->hv_clock.version));
>
> smp_wmb();
>
> @@ -1848,16 +1848,16 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
>
> trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
>
> - kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
> - &vcpu->hv_clock,
> - sizeof(vcpu->hv_clock));
> + kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
> + &vcpu->hv_clock,
> + sizeof(vcpu->hv_clock));
>
> smp_wmb();
>
> vcpu->hv_clock.version++;
> - kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
> - &vcpu->hv_clock,
> - sizeof(vcpu->hv_clock.version));
> + kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
> + &vcpu->hv_clock,
> + sizeof(vcpu->hv_clock.version));
> }
>
> static int kvm_guest_time_update(struct kvm_vcpu *v)
> @@ -2090,7 +2090,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
> return 0;
> }
>
> - if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
> + if (kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.apf.data, gpa,
> sizeof(u32)))
> return 1;
>
> @@ -2109,7 +2109,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
> if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
> return;
>
> - if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
> + if (unlikely(kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.st.stime,
> &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
> return;
>
> @@ -2120,7 +2120,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
>
> vcpu->arch.st.steal.version += 1;
>
> - kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
> + kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
> &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
>
> smp_wmb();
> @@ -2129,14 +2129,14 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
> vcpu->arch.st.last_steal;
> vcpu->arch.st.last_steal = current->sched_info.run_delay;
>
> - kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
> + kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
> &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
>
> smp_wmb();
>
> vcpu->arch.st.steal.version += 1;
>
> - kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
> + kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
> &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
> }
>
> @@ -2241,7 +2241,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> if (!(data & 1))
> break;
>
> - if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
> + if (kvm_vcpu_gfn_to_hva_cache_init(vcpu,
> &vcpu->arch.pv_time, data & ~1ULL,
> sizeof(struct pvclock_vcpu_time_info)))
> vcpu->arch.pv_time_enabled = false;
> @@ -2262,7 +2262,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> if (data & KVM_STEAL_RESERVED_MASK)
> return 1;
>
> - if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
> + if (kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.st.stime,
> data & KVM_STEAL_VALID_BITS,
> sizeof(struct kvm_steal_time)))
> return 1;
> @@ -2876,7 +2876,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
>
> vcpu->arch.st.steal.preempted = 1;
>
> - kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime,
> + kvm_vcpu_write_guest_offset_cached(vcpu, &vcpu->arch.st.stime,
> &vcpu->arch.st.steal.preempted,
> offsetof(struct kvm_steal_time, preempted),
> sizeof(vcpu->arch.st.steal.preempted));
> @@ -8537,9 +8537,8 @@ static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
>
> static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
> {
> -
> - return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
> - sizeof(val));
> + return kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.apf.data, &val,
> + sizeof(val));
> }
>
> void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index cda457bcedc1..17fa466cd5f4 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -641,18 +641,18 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
> int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
> unsigned long len);
> int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
> -int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, unsigned long len);
> +int kvm_vcpu_read_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
> + void *data, unsigned long len);
> int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
> int offset, int len);
> int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
> unsigned long len);
> -int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, unsigned long len);
> -int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, int offset, unsigned long len);
> -int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - gpa_t gpa, unsigned long len);
> +int kvm_vcpu_write_guest_cached(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
> + void *data, unsigned long len);
> +int kvm_vcpu_write_guest_offset_cached(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
> + void *data, int offset, unsigned long len);
> +int kvm_vcpu_gfn_to_hva_cache_init(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
> + gpa_t gpa, unsigned long len);
> int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
> int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
> struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index a83c186cefc1..263a80513ad9 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1981,18 +1981,18 @@ static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
> return 0;
> }
>
> -int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> +int kvm_vcpu_gfn_to_hva_cache_init(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
> gpa_t gpa, unsigned long len)
> {
> - struct kvm_memslots *slots = kvm_memslots(kvm);
> + struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu);
> return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
> }
> -EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
> +EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva_cache_init);
>
> -int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, int offset, unsigned long len)
> +int kvm_vcpu_write_guest_offset_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
> + void *data, int offset, unsigned long len)
> {
> - struct kvm_memslots *slots = kvm_memslots(kvm);
> + struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu);
> int r;
> gpa_t gpa = ghc->gpa + offset;
>
> @@ -2002,7 +2002,7 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
>
> if (unlikely(!ghc->memslot))
> - return kvm_write_guest(kvm, gpa, data, len);
> + return kvm_vcpu_write_guest(vcpu, gpa, data, len);
>
> if (kvm_is_error_hva(ghc->hva))
> return -EFAULT;
> @@ -2014,19 +2014,19 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
> +EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_offset_cached);
>
> -int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, unsigned long len)
> +int kvm_vcpu_write_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
> + void *data, unsigned long len)
> {
> - return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
> + return kvm_vcpu_write_guest_offset_cached(vcpu, ghc, data, 0, len);
> }
> -EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
> +EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_cached);
>
> -int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> - void *data, unsigned long len)
> +int kvm_vcpu_read_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
> + void *data, unsigned long len)
> {
> - struct kvm_memslots *slots = kvm_memslots(kvm);
> + struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu);
> int r;
>
> BUG_ON(len > ghc->len);
> @@ -2035,7 +2035,7 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
> __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
>
> if (unlikely(!ghc->memslot))
> - return kvm_read_guest(kvm, ghc->gpa, data, len);
> + return kvm_vcpu_read_guest(vcpu, ghc->gpa, data, len);
>
> if (kvm_is_error_hva(ghc->hva))
> return -EFAULT;
> @@ -2046,7 +2046,7 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
> +EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_cached);
>
> int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
> {
> --
> 1.8.3.1
>
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