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Date: Tue, 18 Jul 2023 10:49:30 +0800
From: Shaoqin Huang <shahuang@...hat.com>
To: Raghavendra Rao Ananta <rananta@...gle.com>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Huacai Chen <chenhuacai@...nel.org>,
Zenghui Yu <yuzenghui@...wei.com>,
Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...shpatra.org>,
Jing Zhang <jingzhangos@...gle.com>,
Colton Lewis <coltonlewis@...gle.com>,
David Matlack <dmatlack@...gle.com>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
linux-mips@...r.kernel.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, Gavin Shan <gshan@...hat.com>
Subject: Re: [PATCH v6 03/11] KVM: Allow range-based TLB invalidation from
common code
On 7/18/23 00:37, Raghavendra Rao Ananta wrote:
> On Mon, Jul 17, 2023 at 4:40 AM Shaoqin Huang <shahuang@...hat.com> wrote:
>>
>>
>>
>> On 7/15/23 08:53, Raghavendra Rao Ananta wrote:
>>> From: David Matlack <dmatlack@...gle.com>
>>>
>>> Make kvm_flush_remote_tlbs_range() visible in common code and create a
>>> default implementation that just invalidates the whole TLB.
>>>
>>> This paves the way for several future features/cleanups:
>>>
>>> - Introduction of range-based TLBI on ARM.
>>> - Eliminating kvm_arch_flush_remote_tlbs_memslot()
>>> - Moving the KVM/x86 TDP MMU to common code.
>>>
>>> No functional change intended.
>>>
>>> Signed-off-by: David Matlack <dmatlack@...gle.com>
>>> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
>>> Reviewed-by: Gavin Shan <gshan@...hat.com>
>>> ---
>>> arch/x86/include/asm/kvm_host.h | 3 +++
>>> arch/x86/kvm/mmu/mmu.c | 9 ++++-----
>>> arch/x86/kvm/mmu/mmu_internal.h | 3 ---
>>> include/linux/kvm_host.h | 9 +++++++++
>>> virt/kvm/kvm_main.c | 13 +++++++++++++
>>> 5 files changed, 29 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
>>> index a2d3cfc2eb75..08900afbf2ad 100644
>>> --- a/arch/x86/include/asm/kvm_host.h
>>> +++ b/arch/x86/include/asm/kvm_host.h
>>> @@ -1804,6 +1804,9 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
>>> return -ENOTSUPP;
>>> }
>>>
>>> +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
>>> +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages);
>>> +
>>> #define kvm_arch_pmi_in_guest(vcpu) \
>>> ((vcpu) && (vcpu)->arch.handling_intr_from_guest)
>>>
>>> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
>>> index ec169f5c7dce..aaa5e336703a 100644
>>> --- a/arch/x86/kvm/mmu/mmu.c
>>> +++ b/arch/x86/kvm/mmu/mmu.c
>>> @@ -278,16 +278,15 @@ static inline bool kvm_available_flush_remote_tlbs_range(void)
>>> return kvm_x86_ops.flush_remote_tlbs_range;
>>> }
>>>
>>> -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn,
>>> - gfn_t nr_pages)
>>> +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages)
>>> {
>>> int ret = -EOPNOTSUPP;
>>>
>>> if (kvm_x86_ops.flush_remote_tlbs_range)
>>> ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, start_gfn,
>>> - nr_pages);
>>> - if (ret)
>>> - kvm_flush_remote_tlbs(kvm);
>>> + pages);
>> This will be good if parameter pages aligned with parameter kvm.
>>
> Agreed, but pulling 'pages' above brings the char count to 83. If
> that's acceptable, I'm happy to do it in v7.
> Hi Raghavendra,
no need to pulling 'pages' above, just delete one tab, and add some
space before the pages, just like the original `nr_pages` position.
Thanks,
Shaoqin
> Thank you.
> Raghavendra
>> Reviewed-by: Shaoqin Huang <shahuang@...hat.com>
>>> +
>>> + return ret;
>>> }
>>>
>>> static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index);
>>> diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
>>> index d39af5639ce9..86cb83bb3480 100644
>>> --- a/arch/x86/kvm/mmu/mmu_internal.h
>>> +++ b/arch/x86/kvm/mmu/mmu_internal.h
>>> @@ -170,9 +170,6 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
>>> struct kvm_memory_slot *slot, u64 gfn,
>>> int min_level);
>>>
>>> -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn,
>>> - gfn_t nr_pages);
>>> -
>>> /* Flush the given page (huge or not) of guest memory. */
>>> static inline void kvm_flush_remote_tlbs_gfn(struct kvm *kvm, gfn_t gfn, int level)
>>> {
>>> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
>>> index e3f968b38ae9..a731967b24ff 100644
>>> --- a/include/linux/kvm_host.h
>>> +++ b/include/linux/kvm_host.h
>>> @@ -1359,6 +1359,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target);
>>> void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode);
>>>
>>> void kvm_flush_remote_tlbs(struct kvm *kvm);
>>> +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages);
>>>
>>> #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
>>> int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min);
>>> @@ -1486,6 +1487,14 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
>>> }
>>> #endif
>>>
>>> +#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
>>> +static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm,
>>> + gfn_t gfn, u64 pages)
>>> +{
>>> + return -EOPNOTSUPP;
>>> +}
>>> +#endif
>>> +
>>> #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
>>> void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
>>> void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
>>> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>>> index d6b050786155..804470fccac7 100644
>>> --- a/virt/kvm/kvm_main.c
>>> +++ b/virt/kvm/kvm_main.c
>>> @@ -366,6 +366,19 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>>> }
>>> EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
>>>
>>> +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages)
>>> +{
>>> + if (!kvm_arch_flush_remote_tlbs_range(kvm, gfn, pages))
>>> + return;
>>> +
>>> + /*
>>> + * Fall back to a flushing entire TLBs if the architecture range-based
>>> + * TLB invalidation is unsupported or can't be performed for whatever
>>> + * reason.
>>> + */
>>> + kvm_flush_remote_tlbs(kvm);
>>> +}
>>> +
>>> static void kvm_flush_shadow_all(struct kvm *kvm)
>>> {
>>> kvm_arch_flush_shadow_all(kvm);
>>
>> --
>> Shaoqin
>>
>
--
Shaoqin
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