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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 D7714C10F14 for ; Thu, 3 Oct 2019 21:39:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9F48521848 for ; Thu, 3 Oct 2019 21:39:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9F48521848 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 82CC58E0005; Thu, 3 Oct 2019 17:39:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7DCB76B000A; Thu, 3 Oct 2019 17:39:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 65CC68E0003; Thu, 3 Oct 2019 17:39:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0027.hostedemail.com [216.40.44.27]) by kanga.kvack.org (Postfix) with ESMTP id 375BC6B0007 for ; Thu, 3 Oct 2019 17:39:02 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id A7DFB180AD7C3 for ; Thu, 3 Oct 2019 21:39:01 +0000 (UTC) X-FDA: 76003788882.26.sort11_6bdb497705729 X-HE-Tag: sort11_6bdb497705729 X-Filterd-Recvd-Size: 2771 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Thu, 3 Oct 2019 21:39:00 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Oct 2019 14:38:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,253,1566889200"; d="scan'208";a="186051615" Received: from linksys13920.jf.intel.com (HELO rpedgeco-DESK5.jf.intel.com) ([10.54.75.11]) by orsmga008.jf.intel.com with ESMTP; 03 Oct 2019 14:38:57 -0700 From: Rick Edgecombe To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, luto@kernel.org, peterz@infradead.org, dave.hansen@intel.com, pbonzini@redhat.com, sean.j.christopherson@intel.com, keescook@chromium.org Cc: kristen@linux.intel.com, deneen.t.dock@intel.com, Rick Edgecombe Subject: [RFC PATCH 01/13] kvm: Enable MTRR to work with GFNs with perm bits Date: Thu, 3 Oct 2019 14:23:48 -0700 Message-Id: <20191003212400.31130-2-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191003212400.31130-1-rick.p.edgecombe@intel.com> References: <20191003212400.31130-1-rick.p.edgecombe@intel.com> 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: Mask gfn by maxphyaddr in kvm_mtrr_get_guest_memory_type so that the guests view of gfn is used when high bits of the physical memory are used as extra permissions bits. This supports the KVM XO feature. TODO: Since MTRR is emulated using EPT permissions, the XO version of the gpa range will not inherrit the MTRR type with this implementation. There shouldn't be any legacy use of KVM XO, but hypothetically it could interfere with the uncacheable MTRR type. Signed-off-by: Rick Edgecombe --- arch/x86/kvm/mtrr.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c index 25ce3edd1872..da38f3b83e51 100644 --- a/arch/x86/kvm/mtrr.c +++ b/arch/x86/kvm/mtrr.c @@ -621,6 +621,14 @@ u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) const int wt_wb_mask = (1 << MTRR_TYPE_WRBACK) | (1 << MTRR_TYPE_WRTHROUGH); + /* + * Handle situations where gfn bits are used as permissions bits by + * masking KVMs view of the gfn with the guests physical address bits + * in order to match the guests view of physical address. For normal + * situations this will have no effect. + */ + gfn &= (1ULL << (cpuid_maxphyaddr(vcpu) - PAGE_SHIFT)); + start = gfn_to_gpa(gfn); end = start + PAGE_SIZE; -- 2.17.1