From patchwork Mon May 13 14:38:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Chartre X-Patchwork-Id: 10941117 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AEF7D1390 for ; Mon, 13 May 2019 14:41:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A1EFB28306 for ; Mon, 13 May 2019 14:41:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 95C6E28334; Mon, 13 May 2019 14:41:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 430F928306 for ; Mon, 13 May 2019 14:41:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730685AbfEMOlM (ORCPT ); Mon, 13 May 2019 10:41:12 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:47098 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730664AbfEMOlL (ORCPT ); Mon, 13 May 2019 10:41:11 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x4DEd3dB181544; Mon, 13 May 2019 14:39:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=bOd6NTuOO3w4Tse88wsGsS3lTxF7t3wBy812EA6WdBU=; b=Y9nXfUJNbdNXiy0WXZfnXcvJMfJnbW6Wd/jhOsfaH+Nku6LO73tegfk4kUXz6qGARmee jxG1wNCbZiHDX8SNNrTewc3cLIlDZsttlVSwGklecgW/HROVU+I3mtazS3Yvqh11anbo Zv4jHKjLPjfduxRLu4X8LAzZ3P36HyfHmP1W/DyLiXegpYJeMKnqKZFwITYW5qzlSHm5 RtesqMSGG/6fDOLSNgWvXF9bfkYj0YrLp3UqSNuvKowRK44FvGuaRvjBi3RpZ0NPhj/l QmdYQ9IaU3TVKzTuW8I6wo8hxvktW9E/r6qI9QWOuBYsblTK3/WgBv+O9a9uDwsYhX/x cg== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2130.oracle.com with ESMTP id 2sdnttfeja-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 May 2019 14:39:39 +0000 Received: from achartre-desktop.fr.oracle.com (dhcp-10-166-106-34.fr.oracle.com [10.166.106.34]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id x4DEcZQL022780; Mon, 13 May 2019 14:39:31 GMT From: Alexandre Chartre To: pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, alexandre.chartre@oracle.com Subject: [RFC KVM 18/27] kvm/isolation: function to copy page table entries for percpu buffer Date: Mon, 13 May 2019 16:38:26 +0200 Message-Id: <1557758315-12667-19-git-send-email-alexandre.chartre@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com> References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9255 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 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=8.0.1-1810050000 definitions=main-1905130103 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP pcpu_base_addr is already mapped to the KVM address space, but this represents the first percpu chunk. To access a per-cpu buffer not allocated in the first chunk, add a function which maps all cpu buffers corresponding to that per-cpu buffer. Also add function to clear page table entries for a percpu buffer. Signed-off-by: Alexandre Chartre --- arch/x86/kvm/isolation.c | 34 ++++++++++++++++++++++++++++++++++ arch/x86/kvm/isolation.h | 2 ++ 2 files changed, 36 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/isolation.c b/arch/x86/kvm/isolation.c index 539e287..2052abf 100644 --- a/arch/x86/kvm/isolation.c +++ b/arch/x86/kvm/isolation.c @@ -990,6 +990,40 @@ void kvm_clear_range_mapping(void *ptr) EXPORT_SYMBOL(kvm_clear_range_mapping); +void kvm_clear_percpu_mapping(void *percpu_ptr) +{ + void *ptr; + int cpu; + + pr_debug("PERCPU CLEAR percpu=%px\n", percpu_ptr); + for_each_possible_cpu(cpu) { + ptr = per_cpu_ptr(percpu_ptr, cpu); + kvm_clear_range_mapping(ptr); + } +} +EXPORT_SYMBOL(kvm_clear_percpu_mapping); + +int kvm_copy_percpu_mapping(void *percpu_ptr, size_t size) +{ + void *ptr; + int cpu, err; + + pr_debug("PERCPU COPY percpu=%px size=%lx\n", percpu_ptr, size); + for_each_possible_cpu(cpu) { + ptr = per_cpu_ptr(percpu_ptr, cpu); + pr_debug("PERCPU COPY cpu%d addr=%px\n", cpu, ptr); + err = kvm_copy_ptes(ptr, size); + if (err) { + kvm_clear_range_mapping(percpu_ptr); + return err; + } + } + + return 0; +} +EXPORT_SYMBOL(kvm_copy_percpu_mapping); + + static int kvm_isolation_init_mm(void) { pgd_t *kvm_pgd; diff --git a/arch/x86/kvm/isolation.h b/arch/x86/kvm/isolation.h index 7d3c985..3ef2060 100644 --- a/arch/x86/kvm/isolation.h +++ b/arch/x86/kvm/isolation.h @@ -18,5 +18,7 @@ static inline bool kvm_isolation(void) extern void kvm_may_access_sensitive_data(struct kvm_vcpu *vcpu); extern int kvm_copy_ptes(void *ptr, unsigned long size); extern void kvm_clear_range_mapping(void *ptr); +extern int kvm_copy_percpu_mapping(void *percpu_ptr, size_t size); +extern void kvm_clear_percpu_mapping(void *percpu_ptr); #endif