From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E40FC433F4 for ; Fri, 24 Aug 2018 16:26:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E63721523 for ; Fri, 24 Aug 2018 16:26:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E63721523 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728298AbeHXUBy (ORCPT ); Fri, 24 Aug 2018 16:01:54 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:60374 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726488AbeHXUBx (ORCPT ); Fri, 24 Aug 2018 16:01:53 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7OGNqvq030801 for ; Fri, 24 Aug 2018 12:26:31 -0400 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0b-001b2d01.pphosted.com with ESMTP id 2m2kw9vama-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 24 Aug 2018 12:26:30 -0400 Received: from localhost by e34.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 24 Aug 2018 10:26:27 -0600 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7OGQPTn52101138 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 24 Aug 2018 09:26:25 -0700 Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8E2CF7805F; Fri, 24 Aug 2018 10:26:25 -0600 (MDT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0CE6778063; Fri, 24 Aug 2018 10:26:21 -0600 (MDT) Received: from morokweng.localdomain.com (unknown [9.80.232.133]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 24 Aug 2018 10:26:20 -0600 (MDT) From: Thiago Jung Bauermann To: linuxppc-dev@lists.ozlabs.org Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Alexey Kardashevskiy , Anshuman Khandual , Benjamin Herrenschmidt , Christoph Hellwig , Michael Ellerman , Mike Anderson , Paul Mackerras , Ram Pai , Anshuman Khandual , Thiago Jung Bauermann Subject: [RFC PATCH 07/11] powerpc/svm: Use shared memory for Debug Trace Log (DTL) Date: Fri, 24 Aug 2018 13:25:31 -0300 X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180824162535.22798-1-bauerman@linux.ibm.com> References: <20180824162535.22798-1-bauerman@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082416-0016-0000-0000-00000920D653 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009603; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01078233; UDB=6.00555984; IPR=6.00858207; MB=3.00022909; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-24 16:26:29 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082416-0017-0000-0000-0000401D2B19 Message-Id: <20180824162535.22798-8-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-24_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808240172 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anshuman Khandual On Ultravisor platform kmem_cache for DTL buffers must use a constructor function which converts the underlying buddy allocated SLUB cache pages into shared memory so that they are accessible to the hypervisor. Signed-off-by: Anshuman Khandual Signed-off-by: Thiago Jung Bauermann --- arch/powerpc/include/asm/svm.h | 1 + arch/powerpc/kernel/svm.c | 30 ++++++++++++++++++++++++++++++ arch/powerpc/platforms/pseries/setup.c | 5 ++++- 3 files changed, 35 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h index 95d69e472e52..e00688761704 100644 --- a/arch/powerpc/include/asm/svm.h +++ b/arch/powerpc/include/asm/svm.h @@ -16,6 +16,7 @@ static bool is_svm_platform(void) extern void mem_convert_shared(unsigned long pfn, unsigned long npages); extern void mem_convert_secure(unsigned long pfn, unsigned long npages); +extern void dtl_cache_ctor(void *addr); #else static inline bool is_svm_platform(void) { diff --git a/arch/powerpc/kernel/svm.c b/arch/powerpc/kernel/svm.c index 891db2de8c04..1af5caa955f5 100644 --- a/arch/powerpc/kernel/svm.c +++ b/arch/powerpc/kernel/svm.c @@ -66,3 +66,33 @@ int set_memory_decrypted(unsigned long addr, int numpages) return 0; } + +/* There's one dispatch log per CPU. */ +#define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE) + +static struct page *dtl_page_store[NR_DTL_PAGE]; +static long dtl_nr_pages; + +static bool is_dtl_page_shared(struct page *page) +{ + long i; + + for (i = 0; i < dtl_nr_pages; i++) + if (dtl_page_store[i] == page) + return true; + + return false; +} + +void dtl_cache_ctor(void *addr) +{ + unsigned long pfn = PHYS_PFN(__pa(addr)); + struct page *page = pfn_to_page(pfn); + + if (!is_dtl_page_shared(page)) { + dtl_page_store[dtl_nr_pages] = page; + dtl_nr_pages++; + WARN_ON(dtl_nr_pages >= NR_DTL_PAGE); + mem_convert_shared(pfn, PAGE_SIZE); + } +} diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 139f0af6c3d9..50ba77c802d2 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -69,6 +69,7 @@ #include #include #include +#include #include "pseries.h" @@ -288,8 +289,10 @@ static inline int alloc_dispatch_logs(void) static int alloc_dispatch_log_kmem_cache(void) { + void (*ctor)(void *) = is_svm_platform() ? dtl_cache_ctor : NULL; + dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, - DISPATCH_LOG_BYTES, 0, NULL); + DISPATCH_LOG_BYTES, 0, ctor); if (!dtl_cache) { pr_warn("Failed to create dispatch trace log buffer cache\n"); pr_warn("Stolen time statistics will be unreliable\n");