linux-kernel - Re: [RESEND PATCH v5 08/11] KVM: arm64: Implement kvm_arch_flush_remote_tlbs

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Date:   Wed, 5 Jul 2023 10:33:12 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     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
Subject: Re: [RESEND PATCH v5 08/11] KVM: arm64: Implement
 kvm_arch_flush_remote_tlbs_range()

On 6/22/23 03:49, Raghavendra Rao Ananta wrote:
> Implement kvm_arch_flush_remote_tlbs_range() for arm64
> to invalidate the given range in the TLB.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> ---
>   arch/arm64/include/asm/kvm_host.h | 3 +++
>   arch/arm64/kvm/mmu.c              | 7 +++++++
>   2 files changed, 10 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>

> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 81ab41b84f436..343fb530eea9c 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -1081,6 +1081,9 @@ struct kvm *kvm_arch_alloc_vm(void);
>   #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
>   int kvm_arch_flush_remote_tlbs(struct kvm *kvm);
>   
> +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
> +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages);
> +
>   static inline bool kvm_vm_is_protected(struct kvm *kvm)
>   {
>   	return false;
> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index d0a0d3dca9316..c3ec2141c3284 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -92,6 +92,13 @@ int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
>   	return 0;
>   }
>   
> +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages)
> +{
> +	kvm_tlb_flush_vmid_range(&kvm->arch.mmu,
> +				start_gfn << PAGE_SHIFT, pages << PAGE_SHIFT);
> +	return 0;
> +}
> +
>   static bool kvm_is_device_pfn(unsigned long pfn)
>   {
>   	return !pfn_is_map_memory(pfn);