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Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Christophe Leroy , Randy Dunlap , Mina Almasry , Peter Xu , Nitesh Narayan Lal , Andrew Morton , Mike Kravetz , Gerald Schaefer Subject: [PATCH v4 1/4] hugetlbfs: add arch_hugetlb_valid_size Date: Tue, 28 Apr 2020 13:56:11 -0700 Message-Id: <20200428205614.246260-2-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200428205614.246260-1-mike.kravetz@oracle.com> References: <20200428205614.246260-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9605 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 suspectscore=0 adultscore=0 mlxlogscore=999 bulkscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004280163 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9605 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 clxscore=1015 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004280163 Content-Transfer-Encoding: quoted-printable 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: The architecture independent routine hugetlb_default_setup sets up the default huge pages size. It has no way to verify if the passed value is valid, so it accepts it and attempts to validate at a later time. This requires undocumented cooperation between the arch specific and arch independent code. For architectures that support more than one huge page size, provide a routine arch_hugetlb_valid_size to validate a huge page size. hugetlb_default_setup can use this to validate passed values. arch_hugetlb_valid_size will also be used in a subsequent patch to move processing of the "hugepagesz=3D" in arch specific code to a common routine in arch independent code. Signed-off-by: Mike Kravetz Acked-by: Gerald Schaefer [s390] Acked-by: Will Deacon --- arch/arm64/mm/hugetlbpage.c | 17 +++++++++++++---- arch/powerpc/mm/hugetlbpage.c | 20 +++++++++++++------- arch/riscv/mm/hugetlbpage.c | 26 +++++++++++++++++--------- arch/s390/mm/hugetlbpage.c | 16 ++++++++++++---- arch/sparc/mm/init_64.c | 24 ++++++++++++++++-------- arch/x86/mm/hugetlbpage.c | 17 +++++++++++++---- include/linux/hugetlb.h | 1 + mm/hugetlb.c | 21 ++++++++++++++++++--- 8 files changed, 103 insertions(+), 39 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index bbeb6a5a6ba6..069b96ee2aec 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -462,17 +462,26 @@ static int __init hugetlbpage_init(void) } arch_initcall(hugetlbpage_init); =20 -static __init int setup_hugepagesz(char *opt) +bool __init arch_hugetlb_valid_size(unsigned long size) { - unsigned long ps =3D memparse(opt, &opt); - - switch (ps) { + switch (size) { #ifdef CONFIG_ARM64_4K_PAGES case PUD_SIZE: #endif case CONT_PMD_SIZE: case PMD_SIZE: case CONT_PTE_SIZE: + return true; + } + + return false; +} + +static __init int setup_hugepagesz(char *opt) +{ + unsigned long ps =3D memparse(opt, &opt); + + if (arch_hugetlb_valid_size(ps)) { add_huge_page_size(ps); return 1; } diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.= c index 33b3461d91e8..de54d2a37830 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -558,7 +558,7 @@ unsigned long vma_mmu_pagesize(struct vm_area_struct = *vma) return vma_kernel_pagesize(vma); } =20 -static int __init add_huge_page_size(unsigned long long size) +bool __init arch_hugetlb_valid_size(unsigned long size) { int shift =3D __ffs(size); int mmu_psize; @@ -566,20 +566,26 @@ static int __init add_huge_page_size(unsigned long = long size) /* Check that it is a page size supported by the hardware and * that it fits within pagetable and slice limits. */ if (size <=3D PAGE_SIZE || !is_power_of_2(size)) - return -EINVAL; + return false; =20 mmu_psize =3D check_and_get_huge_psize(shift); if (mmu_psize < 0) - return -EINVAL; + return false; =20 BUG_ON(mmu_psize_defs[mmu_psize].shift !=3D shift); =20 - /* Return if huge page size has already been setup */ - if (size_to_hstate(size)) - return 0; + return true; +} =20 - hugetlb_add_hstate(shift - PAGE_SHIFT); +static int __init add_huge_page_size(unsigned long long size) +{ + int shift =3D __ffs(size); + + if (!arch_hugetlb_valid_size((unsigned long)size)) + return -EINVAL; =20 + if (!size_to_hstate(size)) + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } =20 diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index a6189ed36c5f..da1f516bc451 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -12,21 +12,29 @@ int pmd_huge(pmd_t pmd) return pmd_leaf(pmd); } =20 +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (size =3D=3D HPAGE_SIZE) + return true; + else if (IS_ENABLED(CONFIG_64BIT) && size =3D=3D PUD_SIZE) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long ps =3D memparse(opt, &opt); =20 - if (ps =3D=3D HPAGE_SIZE) { - hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); - } else if (IS_ENABLED(CONFIG_64BIT) && ps =3D=3D PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); - return 0; + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); + return 1; } =20 - return 1; + hugetlb_bad_size(); + pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); + return 0; + } __setup("hugepagesz=3D", setup_hugepagesz); =20 diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index f01daddcbc5e..ac25b207624c 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -251,16 +251,24 @@ follow_huge_pud(struct mm_struct *mm, unsigned long= address, return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); } =20 +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (MACHINE_HAS_EDAT1 && size =3D=3D PMD_SIZE) + return true; + else if (MACHINE_HAS_EDAT2 && size =3D=3D PUD_SIZE) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long size; char *string =3D opt; =20 size =3D memparse(opt, &opt); - if (MACHINE_HAS_EDAT1 && size =3D=3D PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (MACHINE_HAS_EDAT2 && size =3D=3D PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + if (arch_hugetlb_valid_size(size)) { + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); } else { hugetlb_bad_size(); pr_err("hugepagesz=3D specifies an unsupported page size %s\n", diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 1cf0d666dea3..2bfe8e22b706 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -360,16 +360,11 @@ static void __init pud_huge_patch(void) __asm__ __volatile__("flush %0" : : "r" (addr)); } =20 -static int __init setup_hugepagesz(char *string) +bool __init arch_hugetlb_valid_size(unsigned long size) { - unsigned long long hugepage_size; - unsigned int hugepage_shift; + unsigned int hugepage_shift =3D ilog2(size); unsigned short hv_pgsz_idx; unsigned int hv_pgsz_mask; - int rc =3D 0; - - hugepage_size =3D memparse(string, &string); - hugepage_shift =3D ilog2(hugepage_size); =20 switch (hugepage_shift) { case HPAGE_16GB_SHIFT: @@ -397,7 +392,20 @@ static int __init setup_hugepagesz(char *string) hv_pgsz_mask =3D 0; } =20 - if ((hv_pgsz_mask & cpu_pgsz_mask) =3D=3D 0U) { + if ((hv_pgsz_mask & cpu_pgsz_mask) =3D=3D 0U) + return false; + + return true; +} + +static int __init setup_hugepagesz(char *string) +{ + unsigned long long hugepage_size; + int rc =3D 0; + + hugepage_size =3D memparse(string, &string); + + if (!arch_hugetlb_valid_size((unsigned long)hugepage_size)) { hugetlb_bad_size(); pr_err("hugepagesz=3D%llu not supported by MMU.\n", hugepage_size); diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 5bfd5aef5378..1c4372bfe782 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -181,13 +181,22 @@ hugetlb_get_unmapped_area(struct file *file, unsign= ed long addr, #endif /* CONFIG_HUGETLB_PAGE */ =20 #ifdef CONFIG_X86_64 +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (size =3D=3D PMD_SIZE) + return true; + else if (size =3D=3D PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long ps =3D memparse(opt, &opt); - if (ps =3D=3D PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (ps =3D=3D PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); } else { hugetlb_bad_size(); printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 43a1cef8f0f1..2eb15f5ab01e 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -521,6 +521,7 @@ int __init alloc_bootmem_huge_page(struct hstate *h); =20 void __init hugetlb_bad_size(void); void __init hugetlb_add_hstate(unsigned order); +bool __init arch_hugetlb_valid_size(unsigned long size); struct hstate *size_to_hstate(unsigned long size); =20 #ifndef HUGE_MAX_HSTATE diff --git a/mm/hugetlb.c b/mm/hugetlb.c index bcabbe02192b..63ca4241ea87 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3256,6 +3256,12 @@ static int __init hugetlb_init(void) } subsys_initcall(hugetlb_init); =20 +/* Overwritten by architectures with more huge page sizes */ +bool __init __attribute((weak)) arch_hugetlb_valid_size(unsigned long si= ze) +{ + return size =3D=3D HPAGE_SIZE; +} + /* Should be called on processing a hugepagesz=3D... option */ void __init hugetlb_bad_size(void) { @@ -3331,12 +3337,21 @@ static int __init hugetlb_nrpages_setup(char *s) } __setup("hugepages=3D", hugetlb_nrpages_setup); =20 -static int __init hugetlb_default_setup(char *s) +static int __init default_hugepagesz_setup(char *s) { - default_hstate_size =3D memparse(s, &s); + unsigned long size; + + size =3D (unsigned long)memparse(s, NULL); + + if (!arch_hugetlb_valid_size(size)) { + pr_err("HugeTLB: unsupported default_hugepagesz %s\n", s); + return 0; + } + + default_hstate_size =3D size; return 1; } -__setup("default_hugepagesz=3D", hugetlb_default_setup); +__setup("default_hugepagesz=3D", default_hugepagesz_setup); =20 static unsigned int cpuset_mems_nr(unsigned int *array) { --=20 2.25.4