linux-kernel - Re: [PATCH v4 27/36] x86: Implement the new page table range API

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Message-ID: <ZBGpCC21vygomEkr@kernel.org>
Date:   Wed, 15 Mar 2023 13:16:24 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v4 27/36] x86: Implement the new page table range API

On Wed, Mar 15, 2023 at 11:34:36AM +0100, Peter Zijlstra wrote:
> On Wed, Mar 15, 2023 at 05:14:35AM +0000, Matthew Wilcox (Oracle) wrote:
> > Add PFN_PTE_SHIFT and a noop update_mmu_cache_range().
> > 
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> > Cc: x86@...nel.org
> > Cc: "H. Peter Anvin" <hpa@...or.com>
> > ---
> >  arch/x86/include/asm/pgtable.h | 13 ++++++-------
> >  1 file changed, 6 insertions(+), 7 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> > index 1031025730d0..b237878061c4 100644
> > --- a/arch/x86/include/asm/pgtable.h
> > +++ b/arch/x86/include/asm/pgtable.h
> > @@ -184,6 +184,8 @@ static inline int pte_special(pte_t pte)
> >  
> >  static inline u64 protnone_mask(u64 val);
> >  
> > +#define PFN_PTE_SHIFT	PAGE_SHIFT
> > +
> >  static inline unsigned long pte_pfn(pte_t pte)
> >  {
> >  	phys_addr_t pfn = pte_val(pte);
> > @@ -1019,13 +1021,6 @@ static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
> >  	return res;
> >  }
> >  
> > -static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
> > -			      pte_t *ptep, pte_t pte)
> > -{
> > -	page_table_check_ptes_set(mm, addr, ptep, pte, 1);
> > -	set_pte(ptep, pte);
> > -}
> > -
> 
> And remove set_pte_at() apparently.. whut?!?

It's now in include/linux/pgtable.h
 
> >  static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
> >  			      pmd_t *pmdp, pmd_t pmd)
> >  {
> > @@ -1291,6 +1286,10 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
> >  		unsigned long addr, pte_t *ptep)
> >  {
> >  }
> > +static inline void update_mmu_cache_range(struct vm_area_struct *vma,
> > +		unsigned long addr, pte_t *ptep, unsigned int nr)
> > +{
> > +}
> >  static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
> >  		unsigned long addr, pmd_t *pmd)
> >  {
> > -- 
> > 2.39.2
> > 
> 

-- 
Sincerely yours,
Mike.