linux-kernel - Re: [PATCH] KVM: RISC-V: Fix wrong usage of PGDIR_SIZE to check page sizes

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Message-ID: <20230123110337.3pmsk7nvip3sxlc4@orel>
Date:   Mon, 23 Jan 2023 12:03:37 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: RISC-V: Fix wrong usage of PGDIR_SIZE to check page
 sizes

On Mon, Jan 23, 2023 at 10:29:28AM +0100, Alexandre Ghiti wrote:
> At the moment, riscv only supports PMD and PUD hugepages. For sv39,
> PGDIR_SIZE == PUD_SIZE but not for sv48 and sv57. So fix this by changing
> PGDIR_SIZE into PUD_SIZE.

Can you please add a sentence as to how you found this? Some test case
or just by analysis?

Anyway,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/kvm/mmu.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
> index 34b57e0be2ef..dbc4ca060174 100644
> --- a/arch/riscv/kvm/mmu.c
> +++ b/arch/riscv/kvm/mmu.c
> @@ -585,7 +585,7 @@ bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
>  	if (!kvm->arch.pgd)
>  		return false;
>  
> -	WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
> +	WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
>  
>  	if (!gstage_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
>  				   &ptep, &ptep_level))
> @@ -603,7 +603,7 @@ bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
>  	if (!kvm->arch.pgd)
>  		return false;
>  
> -	WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
> +	WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
>  
>  	if (!gstage_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
>  				   &ptep, &ptep_level))
> @@ -645,12 +645,12 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
>  	if (logging || (vma->vm_flags & VM_PFNMAP))
>  		vma_pagesize = PAGE_SIZE;
>  
> -	if (vma_pagesize == PMD_SIZE || vma_pagesize == PGDIR_SIZE)
> +	if (vma_pagesize == PMD_SIZE || vma_pagesize == PUD_SIZE)
>  		gfn = (gpa & huge_page_mask(hstate_vma(vma))) >> PAGE_SHIFT;
>  
>  	mmap_read_unlock(current->mm);
>  
> -	if (vma_pagesize != PGDIR_SIZE &&
> +	if (vma_pagesize != PUD_SIZE &&
>  	    vma_pagesize != PMD_SIZE &&
>  	    vma_pagesize != PAGE_SIZE) {
>  		kvm_err("Invalid VMA page size 0x%lx\n", vma_pagesize);
> -- 
> 2.37.2
> 
> 
> -- 
> kvm-riscv mailing list
> kvm-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kvm-riscv

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