* [PATCH v6 04/19] powerpc: mm: Add p?d_large() definitions [not found] <20190326162624.20736-1-steven.price@arm.com> @ 2019-03-26 16:26 ` Steven Price 2019-03-26 16:58 ` Christophe Leroy 0 siblings, 1 reply; 3+ messages in thread From: Steven Price @ 2019-03-26 16:26 UTC (permalink / raw) To: linux-mm Cc: Mark Rutland, Peter Zijlstra, Dave Hansen, Will Deacon, Paul Mackerras, H. Peter Anvin, Liang, Kan, x86, Steven Price, Ingo Molnar, Catalin Marinas, Arnd Bergmann, kvm-ppc, Jérôme Glisse, Borislav Petkov, Andy Lutomirski, Thomas Gleixner, linux-arm-kernel, Ard Biesheuvel, linux-kernel, James Morse, linuxppc-dev walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information is provided by the p?d_large() functions/macros. For powerpc pmd_large() was already implemented, so hoist it out of the CONFIG_TRANSPARENT_HUGEPAGE condition and implement the other levels. Also since we now have a pmd_large always implemented we can drop the pmd_is_leaf() function. CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: Paul Mackerras <paulus@samba.org> CC: Michael Ellerman <mpe@ellerman.id.au> CC: linuxppc-dev@lists.ozlabs.org CC: kvm-ppc@vger.kernel.org Signed-off-by: Steven Price <steven.price@arm.com> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 30 ++++++++++++++------ arch/powerpc/kvm/book3s_64_mmu_radix.c | 12 ++------ 2 files changed, 24 insertions(+), 18 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 581f91be9dd4..f6d1ac8b832e 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -897,6 +897,12 @@ static inline int pud_present(pud_t pud) return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT)); } +#define pud_large pud_large +static inline int pud_large(pud_t pud) +{ + return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE)); +} + extern struct page *pud_page(pud_t pud); extern struct page *pmd_page(pmd_t pmd); static inline pte_t pud_pte(pud_t pud) @@ -940,6 +946,12 @@ static inline int pgd_present(pgd_t pgd) return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT)); } +#define pgd_large pgd_large +static inline int pgd_large(pgd_t pgd) +{ + return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE)); +} + static inline pte_t pgd_pte(pgd_t pgd) { return __pte_raw(pgd_raw(pgd)); @@ -1093,6 +1105,15 @@ static inline bool pmd_access_permitted(pmd_t pmd, bool write) return pte_access_permitted(pmd_pte(pmd), write); } +#define pmd_large pmd_large +/* + * returns true for pmd migration entries, THP, devmap, hugetlb + */ +static inline int pmd_large(pmd_t pmd) +{ + return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); +} + #ifdef CONFIG_TRANSPARENT_HUGEPAGE extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); @@ -1119,15 +1140,6 @@ pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set); } -/* - * returns true for pmd migration entries, THP, devmap, hugetlb - * But compile time dependent on THP config - */ -static inline int pmd_large(pmd_t pmd) -{ - return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); -} - static inline pmd_t pmd_mknotpresent(pmd_t pmd) { return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT); diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index f55ef071883f..1b57b4e3f819 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -363,12 +363,6 @@ static void kvmppc_pte_free(pte_t *ptep) kmem_cache_free(kvm_pte_cache, ptep); } -/* Like pmd_huge() and pmd_large(), but works regardless of config options */ -static inline int pmd_is_leaf(pmd_t pmd) -{ - return !!(pmd_val(pmd) & _PAGE_PTE); -} - static pmd_t *kvmppc_pmd_alloc(void) { return kmem_cache_alloc(kvm_pmd_cache, GFP_KERNEL); @@ -460,7 +454,7 @@ static void kvmppc_unmap_free_pmd(struct kvm *kvm, pmd_t *pmd, bool full, for (im = 0; im < PTRS_PER_PMD; ++im, ++p) { if (!pmd_present(*p)) continue; - if (pmd_is_leaf(*p)) { + if (pmd_large(*p)) { if (full) { pmd_clear(p); } else { @@ -593,7 +587,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, else if (level <= 1) new_pmd = kvmppc_pmd_alloc(); - if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_is_leaf(*pmd))) + if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_large(*pmd))) new_ptep = kvmppc_pte_alloc(); /* Check if we might have been invalidated; let the guest retry if so */ @@ -662,7 +656,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, new_pmd = NULL; } pmd = pmd_offset(pud, gpa); - if (pmd_is_leaf(*pmd)) { + if (pmd_large(*pmd)) { unsigned long lgpa = gpa & PMD_MASK; /* Check if we raced and someone else has set the same thing */ -- 2.20.1 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v6 04/19] powerpc: mm: Add p?d_large() definitions 2019-03-26 16:26 ` [PATCH v6 04/19] powerpc: mm: Add p?d_large() definitions Steven Price @ 2019-03-26 16:58 ` Christophe Leroy 2019-03-28 11:00 ` Steven Price 0 siblings, 1 reply; 3+ messages in thread From: Christophe Leroy @ 2019-03-26 16:58 UTC (permalink / raw) To: Steven Price, linux-mm Cc: Mark Rutland, x86, James Morse, Arnd Bergmann, Ard Biesheuvel, Peter Zijlstra, Catalin Marinas, Dave Hansen, Will Deacon, linux-kernel, kvm-ppc, Jérôme Glisse, Ingo Molnar, Paul Mackerras, Andy Lutomirski, H. Peter Anvin, Borislav Petkov, Thomas Gleixner, linuxppc-dev, linux-arm-kernel, Liang, Kan Le 26/03/2019 à 17:26, Steven Price a écrit : > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_large() functions/macros. > > For powerpc pmd_large() was already implemented, so hoist it out of the > CONFIG_TRANSPARENT_HUGEPAGE condition and implement the other levels. > > Also since we now have a pmd_large always implemented we can drop the > pmd_is_leaf() function. Wouldn't it be better to drop the pmd_is_leaf() in a second patch ? Christophe > > CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: Paul Mackerras <paulus@samba.org> > CC: Michael Ellerman <mpe@ellerman.id.au> > CC: linuxppc-dev@lists.ozlabs.org > CC: kvm-ppc@vger.kernel.org > Signed-off-by: Steven Price <steven.price@arm.com> > --- > arch/powerpc/include/asm/book3s/64/pgtable.h | 30 ++++++++++++++------ > arch/powerpc/kvm/book3s_64_mmu_radix.c | 12 ++------ > 2 files changed, 24 insertions(+), 18 deletions(-) > > diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h > index 581f91be9dd4..f6d1ac8b832e 100644 > --- a/arch/powerpc/include/asm/book3s/64/pgtable.h > +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h > @@ -897,6 +897,12 @@ static inline int pud_present(pud_t pud) > return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT)); > } > > +#define pud_large pud_large > +static inline int pud_large(pud_t pud) > +{ > + return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE)); > +} > + > extern struct page *pud_page(pud_t pud); > extern struct page *pmd_page(pmd_t pmd); > static inline pte_t pud_pte(pud_t pud) > @@ -940,6 +946,12 @@ static inline int pgd_present(pgd_t pgd) > return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT)); > } > > +#define pgd_large pgd_large > +static inline int pgd_large(pgd_t pgd) > +{ > + return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE)); > +} > + > static inline pte_t pgd_pte(pgd_t pgd) > { > return __pte_raw(pgd_raw(pgd)); > @@ -1093,6 +1105,15 @@ static inline bool pmd_access_permitted(pmd_t pmd, bool write) > return pte_access_permitted(pmd_pte(pmd), write); > } > > +#define pmd_large pmd_large > +/* > + * returns true for pmd migration entries, THP, devmap, hugetlb > + */ > +static inline int pmd_large(pmd_t pmd) > +{ > + return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); > +} > + > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); > extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); > @@ -1119,15 +1140,6 @@ pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, > return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set); > } > > -/* > - * returns true for pmd migration entries, THP, devmap, hugetlb > - * But compile time dependent on THP config > - */ > -static inline int pmd_large(pmd_t pmd) > -{ > - return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); > -} > - > static inline pmd_t pmd_mknotpresent(pmd_t pmd) > { > return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT); > diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c > index f55ef071883f..1b57b4e3f819 100644 > --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c > +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c > @@ -363,12 +363,6 @@ static void kvmppc_pte_free(pte_t *ptep) > kmem_cache_free(kvm_pte_cache, ptep); > } > > -/* Like pmd_huge() and pmd_large(), but works regardless of config options */ > -static inline int pmd_is_leaf(pmd_t pmd) > -{ > - return !!(pmd_val(pmd) & _PAGE_PTE); > -} > - > static pmd_t *kvmppc_pmd_alloc(void) > { > return kmem_cache_alloc(kvm_pmd_cache, GFP_KERNEL); > @@ -460,7 +454,7 @@ static void kvmppc_unmap_free_pmd(struct kvm *kvm, pmd_t *pmd, bool full, > for (im = 0; im < PTRS_PER_PMD; ++im, ++p) { > if (!pmd_present(*p)) > continue; > - if (pmd_is_leaf(*p)) { > + if (pmd_large(*p)) { > if (full) { > pmd_clear(p); > } else { > @@ -593,7 +587,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, > else if (level <= 1) > new_pmd = kvmppc_pmd_alloc(); > > - if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_is_leaf(*pmd))) > + if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_large(*pmd))) > new_ptep = kvmppc_pte_alloc(); > > /* Check if we might have been invalidated; let the guest retry if so */ > @@ -662,7 +656,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, > new_pmd = NULL; > } > pmd = pmd_offset(pud, gpa); > - if (pmd_is_leaf(*pmd)) { > + if (pmd_large(*pmd)) { > unsigned long lgpa = gpa & PMD_MASK; > > /* Check if we raced and someone else has set the same thing */ > ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v6 04/19] powerpc: mm: Add p?d_large() definitions 2019-03-26 16:58 ` Christophe Leroy @ 2019-03-28 11:00 ` Steven Price 0 siblings, 0 replies; 3+ messages in thread From: Steven Price @ 2019-03-28 11:00 UTC (permalink / raw) To: Christophe Leroy, linux-mm Cc: Mark Rutland, Dave Hansen, Arnd Bergmann, Ard Biesheuvel, Peter Zijlstra, Catalin Marinas, x86, Will Deacon, linux-kernel, kvm-ppc, Jérôme Glisse, Ingo Molnar, James Morse, Andy Lutomirski, H. Peter Anvin, Borislav Petkov, Paul Mackerras, Thomas Gleixner, linuxppc-dev, linux-arm-kernel, Liang, Kan On 26/03/2019 16:58, Christophe Leroy wrote: > > > Le 26/03/2019 à 17:26, Steven Price a écrit : >> walk_page_range() is going to be allowed to walk page tables other than >> those of user space. For this it needs to know when it has reached a >> 'leaf' entry in the page tables. This information is provided by the >> p?d_large() functions/macros. >> >> For powerpc pmd_large() was already implemented, so hoist it out of the >> CONFIG_TRANSPARENT_HUGEPAGE condition and implement the other levels. >> >> Also since we now have a pmd_large always implemented we can drop the >> pmd_is_leaf() function. > > Wouldn't it be better to drop the pmd_is_leaf() in a second patch ? Fair point, I'll split this patch. Thanks for the review, Steve > Christophe > >> >> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> CC: Paul Mackerras <paulus@samba.org> >> CC: Michael Ellerman <mpe@ellerman.id.au> >> CC: linuxppc-dev@lists.ozlabs.org >> CC: kvm-ppc@vger.kernel.org >> Signed-off-by: Steven Price <steven.price@arm.com> >> --- >> arch/powerpc/include/asm/book3s/64/pgtable.h | 30 ++++++++++++++------ >> arch/powerpc/kvm/book3s_64_mmu_radix.c | 12 ++------ >> 2 files changed, 24 insertions(+), 18 deletions(-) >> >> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h >> b/arch/powerpc/include/asm/book3s/64/pgtable.h >> index 581f91be9dd4..f6d1ac8b832e 100644 >> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h >> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h >> @@ -897,6 +897,12 @@ static inline int pud_present(pud_t pud) >> return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT)); >> } >> +#define pud_large pud_large >> +static inline int pud_large(pud_t pud) >> +{ >> + return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE)); >> +} >> + >> extern struct page *pud_page(pud_t pud); >> extern struct page *pmd_page(pmd_t pmd); >> static inline pte_t pud_pte(pud_t pud) >> @@ -940,6 +946,12 @@ static inline int pgd_present(pgd_t pgd) >> return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT)); >> } >> +#define pgd_large pgd_large >> +static inline int pgd_large(pgd_t pgd) >> +{ >> + return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE)); >> +} >> + >> static inline pte_t pgd_pte(pgd_t pgd) >> { >> return __pte_raw(pgd_raw(pgd)); >> @@ -1093,6 +1105,15 @@ static inline bool pmd_access_permitted(pmd_t >> pmd, bool write) >> return pte_access_permitted(pmd_pte(pmd), write); >> } >> +#define pmd_large pmd_large >> +/* >> + * returns true for pmd migration entries, THP, devmap, hugetlb >> + */ >> +static inline int pmd_large(pmd_t pmd) >> +{ >> + return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); >> +} >> + >> #ifdef CONFIG_TRANSPARENT_HUGEPAGE >> extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); >> extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); >> @@ -1119,15 +1140,6 @@ pmd_hugepage_update(struct mm_struct *mm, >> unsigned long addr, pmd_t *pmdp, >> return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set); >> } >> -/* >> - * returns true for pmd migration entries, THP, devmap, hugetlb >> - * But compile time dependent on THP config >> - */ >> -static inline int pmd_large(pmd_t pmd) >> -{ >> - return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)); >> -} >> - >> static inline pmd_t pmd_mknotpresent(pmd_t pmd) >> { >> return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT); >> diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c >> b/arch/powerpc/kvm/book3s_64_mmu_radix.c >> index f55ef071883f..1b57b4e3f819 100644 >> --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c >> +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c >> @@ -363,12 +363,6 @@ static void kvmppc_pte_free(pte_t *ptep) >> kmem_cache_free(kvm_pte_cache, ptep); >> } >> -/* Like pmd_huge() and pmd_large(), but works regardless of config >> options */ >> -static inline int pmd_is_leaf(pmd_t pmd) >> -{ >> - return !!(pmd_val(pmd) & _PAGE_PTE); >> -} >> - >> static pmd_t *kvmppc_pmd_alloc(void) >> { >> return kmem_cache_alloc(kvm_pmd_cache, GFP_KERNEL); >> @@ -460,7 +454,7 @@ static void kvmppc_unmap_free_pmd(struct kvm *kvm, >> pmd_t *pmd, bool full, >> for (im = 0; im < PTRS_PER_PMD; ++im, ++p) { >> if (!pmd_present(*p)) >> continue; >> - if (pmd_is_leaf(*p)) { >> + if (pmd_large(*p)) { >> if (full) { >> pmd_clear(p); >> } else { >> @@ -593,7 +587,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t >> *pgtable, pte_t pte, >> else if (level <= 1) >> new_pmd = kvmppc_pmd_alloc(); >> - if (level == 0 && !(pmd && pmd_present(*pmd) && >> !pmd_is_leaf(*pmd))) >> + if (level == 0 && !(pmd && pmd_present(*pmd) && !pmd_large(*pmd))) >> new_ptep = kvmppc_pte_alloc(); >> /* Check if we might have been invalidated; let the guest >> retry if so */ >> @@ -662,7 +656,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t >> *pgtable, pte_t pte, >> new_pmd = NULL; >> } >> pmd = pmd_offset(pud, gpa); >> - if (pmd_is_leaf(*pmd)) { >> + if (pmd_large(*pmd)) { >> unsigned long lgpa = gpa & PMD_MASK; >> /* Check if we raced and someone else has set the same >> thing */ >> > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-03-28 11:02 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <20190326162624.20736-1-steven.price@arm.com>
2019-03-26 16:26 ` [PATCH v6 04/19] powerpc: mm: Add p?d_large() definitions Steven Price
2019-03-26 16:58 ` Christophe Leroy
2019-03-28 11:00 ` Steven Price
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox