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Shutemov" To: Bibo Mao Cc: Andrew Morton , Thomas Bogendoerfer , Paul Burton , Anshuman Khandual , Mike Rapoport , Daniel Silsby , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 1/3] mm: set page fault address for update_mmu_cache_pmd Message-ID: <20200630100940.wo5l5fcs44xhrqo7@box> References: <1592990792-1923-1-git-send-email-maobibo@loongson.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1592990792-1923-1-git-send-email-maobibo@loongson.cn> X-Rspamd-Queue-Id: D6ADA3000109DF15 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jun 24, 2020 at 05:26:30PM +0800, Bibo Mao wrote: > update_mmu_cache_pmd is used to update tlb for the pmd entry by > software. On MIPS system, the tlb entry indexed by page fault > address maybe exists already, only that tlb entry may be small > page, also it may be huge page. Before updating pmd entry with > huge page size, older tlb entry need to be invalidated. > > Here page fault address is passed to function update_mmu_cache_pmd, > rather than pmd huge page start address. The page fault address > can be used for invalidating older tlb entry. > > Signed-off-by: Bibo Mao > --- > arch/mips/include/asm/pgtable.h | 9 +++++++++ > mm/huge_memory.c | 7 ++++--- > mm/memory.c | 2 +- > 3 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h > index dd7a0f5..bd81661 100644 > --- a/arch/mips/include/asm/pgtable.h > +++ b/arch/mips/include/asm/pgtable.h > @@ -554,11 +554,20 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, > #define __HAVE_ARCH_UPDATE_MMU_TLB > #define update_mmu_tlb update_mmu_cache > > +extern void local_flush_tlb_page(struct vm_area_struct *vma, > + unsigned long page); > static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, > unsigned long address, pmd_t *pmdp) > { > pte_t pte = *(pte_t *)pmdp; > > + /* > + * If pmd_none is true, older tlb entry will be normal page. > + * here to invalidate older tlb entry indexed by address > + * parameter address must be page fault address rather than > + * start address of pmd huge page > + */ > + local_flush_tlb_page(vma, address); Can't say I follow what is going on. Why local? What happens on SMP? And don't you want to flush PMD_SIZE range around the address? > __update_tlb(vma, address, pte); > } > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 78c84be..0f9187b 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -780,6 +780,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, > pgtable_t pgtable) > { > struct mm_struct *mm = vma->vm_mm; > + unsigned long start = addr & PMD_MASK; > pmd_t entry; > spinlock_t *ptl; > > @@ -792,7 +793,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, > } > entry = pmd_mkyoung(*pmd); > entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); > - if (pmdp_set_access_flags(vma, addr, pmd, entry, 1)) > + if (pmdp_set_access_flags(vma, start, pmd, entry, 1)) > update_mmu_cache_pmd(vma, addr, pmd); > } > > @@ -813,7 +814,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, > pgtable = NULL; > } > > - set_pmd_at(mm, addr, pmd, entry); > + set_pmd_at(mm, start, pmd, entry); > update_mmu_cache_pmd(vma, addr, pmd); > > out_unlock: > @@ -864,7 +865,7 @@ vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn, > > track_pfn_insert(vma, &pgprot, pfn); > > - insert_pfn_pmd(vma, addr, vmf->pmd, pfn, pgprot, write, pgtable); > + insert_pfn_pmd(vma, vmf->address, vmf->pmd, pfn, pgprot, write, pgtable); > return VM_FAULT_NOPAGE; > } > EXPORT_SYMBOL_GPL(vmf_insert_pfn_pmd_prot); > diff --git a/mm/memory.c b/mm/memory.c > index dc7f354..c703458 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3592,7 +3592,7 @@ static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page) > > set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry); > > - update_mmu_cache_pmd(vma, haddr, vmf->pmd); > + update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); > > /* fault is handled */ > ret = 0; > -- > 1.8.3.1 > > -- Kirill A. Shutemov