From patchwork Mon May 13 14:38:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Chartre X-Patchwork-Id: 10941121 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 43E8E1390 for ; Mon, 13 May 2019 14:41:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3670D27861 for ; Mon, 13 May 2019 14:41:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2A27C2832D; Mon, 13 May 2019 14:41:32 +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 CE01F27861 for ; Mon, 13 May 2019 14:41:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730452AbfEMOkB (ORCPT ); Mon, 13 May 2019 10:40:01 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:37252 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730420AbfEMOkA (ORCPT ); Mon, 13 May 2019 10:40:00 -0400 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x4DEd28F193025; Mon, 13 May 2019 14:39:16 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=3oQZsnmQ7NshrUK5gBFOiQdwJCmvyMk7rTDgLZ4eiR8=; b=cackC5e/rN14Atf5QlnsuYve24xrmHKk5OAv4LozaAp9vhiUL7E7xPH3kbnOM8VYLH+M qQZDMDajYAWzXDX4pYfxSi/cFR9+miTzGtpQvwsGANTuO936Hac7155wikox7cO9zHM6 D6VSW0wFlH4kS9hhjEHDuhBzZL61Y1YPaaQ9QapuqevDj5phnii9KR4rMc6oFyvj+0cK chnwMcSACXVNjOAa1xqmZO14HcVVu9E4v0xi+ZQhdjbaq/Q1oelYLJg/hz12bN7CBmtg 1H1C0ZDiqvGmCSUtMdjVlrxOudApkaffggciBhogmTfWK5aks2i24a2IdgYkJ3LSxlPk OA== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp2130.oracle.com with ESMTP id 2sdkwdfkwq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 May 2019 14:39:16 +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 x4DEcZQF022780; Mon, 13 May 2019 14:39:13 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 12/27] kvm/isolation: add KVM page table entry allocation functions Date: Mon, 13 May 2019 16:38:20 +0200 Message-Id: <1557758315-12667-13-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=2 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 These functions allocate p4d/pud/pmd/pte pages and ensure that pages are in the KVM page table. Signed-off-by: Alexandre Chartre --- arch/x86/kvm/isolation.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 94 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/isolation.c b/arch/x86/kvm/isolation.c index b29a09b..6ec86df 100644 --- a/arch/x86/kvm/isolation.c +++ b/arch/x86/kvm/isolation.c @@ -248,6 +248,100 @@ static inline void kvm_p4d_free(struct mm_struct *mm, p4d_t *p4d) p4d_free(mm, PGTD_ALIGN(p4d)); } +/* + * kvm_pXX_alloc() functions are equivalent to kernel pXX_alloc() + * functions but, in addition, they ensure that page table pointers + * are in the KVM page table. Otherwise an error is returned. + */ + +static pte_t *kvm_pte_alloc(struct mm_struct *mm, pmd_t *pmd, + unsigned long addr) +{ + pte_t *pte; + + if (pmd_none(*pmd)) { + pte = pte_alloc_kernel(pmd, addr); + if (!pte) { + pr_debug("PTE: ERR ALLOC\n"); + return ERR_PTR(-ENOMEM); + } + if (!kvm_add_pgt_directory(pte, PGT_LEVEL_PTE)) { + kvm_pte_free(mm, pte); + return ERR_PTR(-EINVAL); + } + } else { + pte = kvm_pte_offset(pmd, addr); + } + + return pte; +} + +static pmd_t *kvm_pmd_alloc(struct mm_struct *mm, pud_t *pud, + unsigned long addr) +{ + pmd_t *pmd; + + if (pud_none(*pud)) { + pmd = pmd_alloc(mm, pud, addr); + if (!pmd) { + pr_debug("PMD: ERR ALLOC\n"); + return ERR_PTR(-ENOMEM); + } + if (!kvm_add_pgt_directory(pmd, PGT_LEVEL_PMD)) { + kvm_pmd_free(mm, pmd); + return ERR_PTR(-EINVAL); + } + } else { + pmd = kvm_pmd_offset(pud, addr); + } + + return pmd; +} + +static pud_t *kvm_pud_alloc(struct mm_struct *mm, p4d_t *p4d, + unsigned long addr) +{ + pud_t *pud; + + if (p4d_none(*p4d)) { + pud = pud_alloc(mm, p4d, addr); + if (!pud) { + pr_debug("PUD: ERR ALLOC\n"); + return ERR_PTR(-ENOMEM); + } + if (!kvm_add_pgt_directory(pud, PGT_LEVEL_PUD)) { + kvm_pud_free(mm, pud); + return ERR_PTR(-EINVAL); + } + } else { + pud = kvm_pud_offset(p4d, addr); + } + + return pud; +} + +static p4d_t *kvm_p4d_alloc(struct mm_struct *mm, pgd_t *pgd, + unsigned long addr) +{ + p4d_t *p4d; + + if (pgd_none(*pgd)) { + p4d = p4d_alloc(mm, pgd, addr); + if (!p4d) { + pr_debug("P4D: ERR ALLOC\n"); + return ERR_PTR(-ENOMEM); + } + if (!kvm_add_pgt_directory(p4d, PGT_LEVEL_P4D)) { + kvm_p4d_free(mm, p4d); + return ERR_PTR(-EINVAL); + } + } else { + p4d = kvm_p4d_offset(pgd, addr); + } + + return p4d; +} + static int kvm_isolation_init_mm(void) {