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

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Date:   Wed, 15 Mar 2023 16:12:19 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mike Rapoport <rppt@...nel.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 12:19:41PM +0100, Peter Zijlstra wrote:
> On Wed, Mar 15, 2023 at 01:16:24PM +0200, Mike Rapoport wrote:
> > 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
> 
> All I have is this one patch -- and the changelog doesn't mention this.
> HTF am I supposed to know that?

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