linux-kernel - Re: [PATCH -fixes v2] riscv: Fix missing PAGE_PFN

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Message-ID: <CAAhSdy1gr_WvCJUMXMwtZUux9qBsW-b_LGFg4=tdnkv5b538sg@mail.gmail.com>
Date:   Mon, 13 Jun 2022 15:01:28 +0530
From:   Anup Patel <anup@...infault.org>
To:     Alexandre Ghiti <alexandre.ghiti@...onical.com>,
        Palmer Dabbelt <palmer@...belt.com>
Cc:     Heiko Stübner <heiko@...ech.de>,
        Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atishp@...shpatra.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        KVM General <kvm@...r.kernel.org>,
        "open list:KERNEL VIRTUAL MACHINE FOR RISC-V (KVM/riscv)" 
        <kvm-riscv@...ts.infradead.org>
Subject: Re: [PATCH -fixes v2] riscv: Fix missing PAGE_PFN_MASK

On Mon, Jun 13, 2022 at 2:23 PM Alexandre Ghiti
<alexandre.ghiti@...onical.com> wrote:
>
> There are a bunch of functions that use the PFN from a page table entry
> that end up with the svpbmt upper-bits because they are missing the newly
> introduced PAGE_PFN_MASK which leads to wrong addresses conversions and
> then crash: fix this by adding this mask.
>
> Fixes: 100631b48ded ("riscv: Fix accessing pfn bits in PTEs for non-32bit variants")
> Signed-off-by: Alexandre Ghiti <alexandre.ghiti@...onical.com>

Looks good to me.

Reviewed-by: Anup Patel <anup@...infault.org>

@Palmer let me know if you want me to take this through the KVM repo.

Regards,
Anup

> ---
>  arch/riscv/include/asm/pgtable-64.h | 12 ++++++------
>  arch/riscv/include/asm/pgtable.h    |  6 +++---
>  arch/riscv/kvm/mmu.c                |  2 +-
>  3 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
> index 5c2aba5efbd0..dc42375c2357 100644
> --- a/arch/riscv/include/asm/pgtable-64.h
> +++ b/arch/riscv/include/asm/pgtable-64.h
> @@ -175,7 +175,7 @@ static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
>
>  static inline unsigned long _pud_pfn(pud_t pud)
>  {
> -       return pud_val(pud) >> _PAGE_PFN_SHIFT;
> +       return __page_val_to_pfn(pud_val(pud));
>  }
>
>  static inline pmd_t *pud_pgtable(pud_t pud)
> @@ -278,13 +278,13 @@ static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
>
>  static inline unsigned long _p4d_pfn(p4d_t p4d)
>  {
> -       return p4d_val(p4d) >> _PAGE_PFN_SHIFT;
> +       return __page_val_to_pfn(p4d_val(p4d));
>  }
>
>  static inline pud_t *p4d_pgtable(p4d_t p4d)
>  {
>         if (pgtable_l4_enabled)
> -               return (pud_t *)pfn_to_virt(p4d_val(p4d) >> _PAGE_PFN_SHIFT);
> +               return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d)));
>
>         return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
>  }
> @@ -292,7 +292,7 @@ static inline pud_t *p4d_pgtable(p4d_t p4d)
>
>  static inline struct page *p4d_page(p4d_t p4d)
>  {
> -       return pfn_to_page(p4d_val(p4d) >> _PAGE_PFN_SHIFT);
> +       return pfn_to_page(__page_val_to_pfn(p4d_val(p4d)));
>  }
>
>  #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
> @@ -347,7 +347,7 @@ static inline void pgd_clear(pgd_t *pgd)
>  static inline p4d_t *pgd_pgtable(pgd_t pgd)
>  {
>         if (pgtable_l5_enabled)
> -               return (p4d_t *)pfn_to_virt(pgd_val(pgd) >> _PAGE_PFN_SHIFT);
> +               return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd)));
>
>         return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
>  }
> @@ -355,7 +355,7 @@ static inline p4d_t *pgd_pgtable(pgd_t pgd)
>
>  static inline struct page *pgd_page(pgd_t pgd)
>  {
> -       return pfn_to_page(pgd_val(pgd) >> _PAGE_PFN_SHIFT);
> +       return pfn_to_page(__page_val_to_pfn(pgd_val(pgd)));
>  }
>  #define pgd_page(pgd)  pgd_page(pgd)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 1d1be9d9419c..5dbd6610729b 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -261,7 +261,7 @@ static inline pgd_t pfn_pgd(unsigned long pfn, pgprot_t prot)
>
>  static inline unsigned long _pgd_pfn(pgd_t pgd)
>  {
> -       return pgd_val(pgd) >> _PAGE_PFN_SHIFT;
> +       return __page_val_to_pfn(pgd_val(pgd));
>  }
>
>  static inline struct page *pmd_page(pmd_t pmd)
> @@ -590,14 +590,14 @@ static inline pmd_t pmd_mkinvalid(pmd_t pmd)
>         return __pmd(pmd_val(pmd) & ~(_PAGE_PRESENT|_PAGE_PROT_NONE));
>  }
>
> -#define __pmd_to_phys(pmd)  (pmd_val(pmd) >> _PAGE_PFN_SHIFT << PAGE_SHIFT)
> +#define __pmd_to_phys(pmd)  (__page_val_to_pfn(pmd_val(pmd)) << PAGE_SHIFT)
>
>  static inline unsigned long pmd_pfn(pmd_t pmd)
>  {
>         return ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT);
>  }
>
> -#define __pud_to_phys(pud)  (pud_val(pud) >> _PAGE_PFN_SHIFT << PAGE_SHIFT)
> +#define __pud_to_phys(pud)  (__page_val_to_pfn(pud_val(pud)) << PAGE_SHIFT)
>
>  static inline unsigned long pud_pfn(pud_t pud)
>  {
> diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
> index 1c00695ebee7..9826073fbc67 100644
> --- a/arch/riscv/kvm/mmu.c
> +++ b/arch/riscv/kvm/mmu.c
> @@ -54,7 +54,7 @@ static inline unsigned long gstage_pte_index(gpa_t addr, u32 level)
>
>  static inline unsigned long gstage_pte_page_vaddr(pte_t pte)
>  {
> -       return (unsigned long)pfn_to_virt(pte_val(pte) >> _PAGE_PFN_SHIFT);
> +       return (unsigned long)pfn_to_virt(__page_val_to_pfn(pte_val(pte)));
>  }
>
>  static int gstage_page_size_to_level(unsigned long page_size, u32 *out_level)
> --
> 2.34.1
>