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Wed, 19 Aug 2020 13:01:39 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, akpm@linux-foundation.org Subject: [PATCH v2 07/13] mm/debug_vm_pgtable/set_pte/pmd/pud: Don't use set_*_at to update an existing pte entry Date: Wed, 19 Aug 2020 18:31:01 +0530 Message-Id: <20200819130107.478414-8-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200819130107.478414-1-aneesh.kumar@linux.ibm.com> References: <20200819130107.478414-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-08-19_04:2020-08-19, 2020-08-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 mlxscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxlogscore=383 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008190110 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" , Anshuman Khandual Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" set_pte_at() should not be used to set a pte entry at locations that already holds a valid pte entry. Architectures like ppc64 don't do TLB invalidate in set_pte_at() and hence expect it to be used to set locations that are not a valid PTE. Signed-off-by: Aneesh Kumar K.V --- mm/debug_vm_pgtable.c | 35 +++++++++++++++-------------------- 1 file changed, 15 insertions(+), 20 deletions(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 76f4c713e5a3..9c7e2c9cfc76 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -74,15 +74,18 @@ static void __init pte_advanced_tests(struct mm_struct *mm, { pte_t pte = pfn_pte(pfn, prot); + /* + * Architectures optimize set_pte_at by avoiding TLB flush. + * This requires set_pte_at to be not used to update an + * existing pte entry. Clear pte before we do set_pte_at + */ + pr_debug("Validating PTE advanced\n"); pte = pfn_pte(pfn, prot); set_pte_at(mm, vaddr, ptep, pte); ptep_set_wrprotect(mm, vaddr, ptep); pte = ptep_get(ptep); WARN_ON(pte_write(pte)); - - pte = pfn_pte(pfn, prot); - set_pte_at(mm, vaddr, ptep, pte); ptep_get_and_clear(mm, vaddr, ptep); pte = ptep_get(ptep); WARN_ON(!pte_none(pte)); @@ -96,13 +99,11 @@ static void __init pte_advanced_tests(struct mm_struct *mm, ptep_set_access_flags(vma, vaddr, ptep, pte, 1); pte = ptep_get(ptep); WARN_ON(!(pte_write(pte) && pte_dirty(pte))); - - pte = pfn_pte(pfn, prot); - set_pte_at(mm, vaddr, ptep, pte); ptep_get_and_clear_full(mm, vaddr, ptep, 1); pte = ptep_get(ptep); WARN_ON(!pte_none(pte)); + pte = pfn_pte(pfn, prot); pte = pte_mkyoung(pte); set_pte_at(mm, vaddr, ptep, pte); ptep_test_and_clear_young(vma, vaddr, ptep); @@ -164,9 +165,6 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmdp_set_wrprotect(mm, vaddr, pmdp); pmd = READ_ONCE(*pmdp); WARN_ON(pmd_write(pmd)); - - pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); - set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_huge_get_and_clear(mm, vaddr, pmdp); pmd = READ_ONCE(*pmdp); WARN_ON(!pmd_none(pmd)); @@ -180,13 +178,11 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); pmd = READ_ONCE(*pmdp); WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); - - pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); - set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); pmd = READ_ONCE(*pmdp); WARN_ON(!pmd_none(pmd)); + pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); pmd = pmd_mkyoung(pmd); set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_test_and_clear_young(vma, vaddr, pmdp); @@ -283,18 +279,10 @@ static void __init pud_advanced_tests(struct mm_struct *mm, WARN_ON(pud_write(pud)); #ifndef __PAGETABLE_PMD_FOLDED - - pud = pud_mkhuge(pfn_pud(pfn, prot)); - set_pud_at(mm, vaddr, pudp, pud); pudp_huge_get_and_clear(mm, vaddr, pudp); pud = READ_ONCE(*pudp); WARN_ON(!pud_none(pud)); - pud = pud_mkhuge(pfn_pud(pfn, prot)); - set_pud_at(mm, vaddr, pudp, pud); - pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); - pud = READ_ONCE(*pudp); - WARN_ON(!pud_none(pud)); #endif /* __PAGETABLE_PMD_FOLDED */ pud = pud_mkhuge(pfn_pud(pfn, prot)); @@ -307,6 +295,13 @@ static void __init pud_advanced_tests(struct mm_struct *mm, pud = READ_ONCE(*pudp); WARN_ON(!(pud_write(pud) && pud_dirty(pud))); +#ifndef __PAGETABLE_PMD_FOLDED + pudp_huge_get_and_clear_full(vma, vaddr, pudp, 1); + pud = READ_ONCE(*pudp); + WARN_ON(!pud_none(pud)); +#endif /* __PAGETABLE_PMD_FOLDED */ + + pud = pud_mkhuge(pfn_pud(pfn, prot)); pud = pud_mkyoung(pud); set_pud_at(mm, vaddr, pudp, pud); pudp_test_and_clear_young(vma, vaddr, pudp); -- 2.26.2