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Thu, 10 Jun 2021 15:42:22 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B495C42045; Thu, 10 Jun 2021 15:42:21 +0000 (GMT) Received: from ibm-vm.ibmuc.com (unknown [9.145.5.240]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 10 Jun 2021 15:42:21 +0000 (GMT) From: Claudio Imbrenda To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, frankja@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, david@redhat.com, linux-mm@kvack.org, Andrew Morton , Nicholas Piggin , Uladzislau Rezki , Catalin Marinas , Thomas Gleixner , Ingo Molnar , David Rientjes , Christoph Hellwig Subject: [PATCH v3 1/2] mm/vmalloc: add vmalloc_no_huge Date: Thu, 10 Jun 2021 17:42:19 +0200 Message-Id: <20210610154220.529122-2-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210610154220.529122-1-imbrenda@linux.ibm.com> References: <20210610154220.529122-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: zyArlWDvrVWhy5c4PKKsxS6DEZSDGhAV X-Proofpoint-ORIG-GUID: yYfALIzOA1g5D1szFX7LNQTRxnyVsT7D X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-06-10_10:2021-06-10,2021-06-10 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 impostorscore=0 mlxscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 spamscore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106100099 Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=I30T5W3t; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf21.hostedemail.com: domain of imbrenda@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=imbrenda@linux.ibm.com X-Rspamd-Server: rspam02 X-Stat-Signature: gouzdcmepyyu8nnk8xxrrkrjuyi9tsyp X-Rspamd-Queue-Id: 3D698E00026B X-HE-Tag: 1623339748-880404 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 recent patches to add support for hugepage vmalloc mappings added a flag for __vmalloc_node_range to allow to request small pages. This flag is not accessible when calling vmalloc, the only option is to call directly __vmalloc_node_range, which is not exported. This means that a module can't vmalloc memory with small pages. Case in point: KVM on s390x needs to vmalloc a large area, and it needs to be mapped with small pages, because of a hardware limitation. This patch adds the function vmalloc_no_huge, which works like vmalloc, but it is guaranteed to always back the mapping using small pages. This function is exported, therefore it is usable by modules. Signed-off-by: Claudio Imbrenda Cc: Andrew Morton Cc: Nicholas Piggin Cc: Uladzislau Rezki (Sony) Cc: Catalin Marinas Cc: Thomas Gleixner Cc: Ingo Molnar Cc: David Rientjes Cc: Christoph Hellwig Reviewed-by: Uladzislau Rezki (Sony) Acked-by: Nicholas Piggin --- include/linux/vmalloc.h | 1 + mm/vmalloc.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 4d668abb6391..bfaaf0b6fa76 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -135,6 +135,7 @@ extern void *__vmalloc_node_range(unsigned long size, unsigned long align, const void *caller); void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, int node, const void *caller); +void *vmalloc_no_huge(unsigned long size); extern void vfree(const void *addr); extern void vfree_atomic(const void *addr); diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a13ac524f6ff..296a2fcc3fbe 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2998,6 +2998,22 @@ void *vmalloc(unsigned long size) } EXPORT_SYMBOL(vmalloc); +/** + * vmalloc_no_huge - allocate virtually contiguous memory using small pages + * @size: allocation size + * + * Allocate enough non-huge pages to cover @size from the page level + * allocator and map them into contiguous kernel virtual space. + * + * Return: pointer to the allocated memory or %NULL on error + */ +void *vmalloc_no_huge(unsigned long size) +{ + return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, GFP_KERNEL, PAGE_KERNEL, + VM_NO_HUGE_VMAP, NUMA_NO_NODE, __builtin_return_address(0)); +} +EXPORT_SYMBOL(vmalloc_no_huge); + /** * vzalloc - allocate virtually contiguous memory with zero fill * @size: allocation size