linux-kernel - Re: [PATCH v12 58/84] KVM: RISC-V: Use kvm_faultin

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Message-ID: <CAAhSdy2whfRBm9HBkr=gSwxpFHGwGtB70fKNCqG1-MeHmB1K7w@mail.gmail.com>
Date: Tue, 6 Aug 2024 20:34:20 +0530
From: Anup Patel <anup@...infault.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Tianrui Zhao <zhaotianrui@...ngson.cn>, 
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>, 
	Michael Ellerman <mpe@...erman.id.au>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	loongarch@...ts.linux.dev, linux-mips@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	David Matlack <dmatlack@...gle.com>, David Stevens <stevensd@...omium.org>
Subject: Re: [PATCH v12 58/84] KVM: RISC-V: Use kvm_faultin_pfn() when mapping
 pfns into the guest

On Sat, Jul 27, 2024 at 5:24 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Convert RISC-V to __kvm_faultin_pfn()+kvm_release_faultin_page(), which
> are new APIs to consolidate arch code and provide consistent behavior
> across all KVM architectures.
>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

For KVM RISC-V:
Acked-by: Anup Patel <anup@...infault.org>

Regards,
Anup


> ---
>  arch/riscv/kvm/mmu.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
> index 806f68e70642..f73d6a79a78c 100644
> --- a/arch/riscv/kvm/mmu.c
> +++ b/arch/riscv/kvm/mmu.c
> @@ -601,6 +601,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
>         bool logging = (memslot->dirty_bitmap &&
>                         !(memslot->flags & KVM_MEM_READONLY)) ? true : false;
>         unsigned long vma_pagesize, mmu_seq;
> +       struct page *page;
>
>         /* We need minimum second+third level pages */
>         ret = kvm_mmu_topup_memory_cache(pcache, gstage_pgd_levels);
> @@ -631,7 +632,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
>
>         /*
>          * Read mmu_invalidate_seq so that KVM can detect if the results of
> -        * vma_lookup() or gfn_to_pfn_prot() become stale priort to acquiring
> +        * vma_lookup() or __kvm_faultin_pfn() become stale priort to acquiring
>          * kvm->mmu_lock.
>          *
>          * Rely on mmap_read_unlock() for an implicit smp_rmb(), which pairs
> @@ -647,7 +648,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
>                 return -EFAULT;
>         }
>
> -       hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writable);
> +       hfn = kvm_faultin_pfn(vcpu, gfn, is_write, &writable, &page);
>         if (hfn == KVM_PFN_ERR_HWPOISON) {
>                 send_sig_mceerr(BUS_MCEERR_AR, (void __user *)hva,
>                                 vma_pageshift, current);
> @@ -681,11 +682,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
>                 kvm_err("Failed to map in G-stage\n");
>
>  out_unlock:
> -       if ((!ret || ret == -EEXIST) && writable)
> -               kvm_set_pfn_dirty(hfn);
> -       else
> -               kvm_release_pfn_clean(hfn);
> -
> +       kvm_release_faultin_page(kvm, page, ret && ret != -EEXIST, writable);
>         spin_unlock(&kvm->mmu_lock);
>         return ret;
>  }
> --
> 2.46.0.rc1.232.g9752f9e123-goog
>