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[141.146.126.79]) by mx.google.com with ESMTPS id c17si82803itc.40.2019.05.13.07.39.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 07:39:26 -0700 (PDT) Received-SPF: pass (google.com: domain of alexandre.chartre@oracle.com designates 141.146.126.79 as permitted sender) client-ip=141.146.126.79; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b="cackC5e/"; spf=pass (google.com: domain of alexandre.chartre@oracle.com designates 141.146.126.79 as permitted sender) smtp.mailfrom=alexandre.chartre@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com 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 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: 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) { -- 1.7.1