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[23.128.96.33]) by mx.google.com with ESMTPS id eh14-20020a056a00808e00b0068e3c6a9e95si8868891pfb.19.2023.09.12.15.21.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Sep 2023 15:21:38 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) client-ip=23.128.96.33; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=beoIYyLF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by lipwig.vger.email (Postfix) with ESMTP id 3FE4A804C216; Tue, 12 Sep 2023 11:46:49 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237473AbjILSqF (ORCPT + 36 others); Tue, 12 Sep 2023 14:46:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236045AbjILSqD (ORCPT ); Tue, 12 Sep 2023 14:46:03 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15B7D10D9 for ; Tue, 12 Sep 2023 11:45:59 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-59b6083fa00so47053377b3.0 for ; Tue, 12 Sep 2023 11:45:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694544358; x=1695149158; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=KxsKqPZq5p15xyDVXXLvft8EHyxkBVs3E9jtZwaSo4E=; b=beoIYyLFM6CO3BCIy1jNFebumt2d2ns9gQYUKwO8+Q9KedfEyiM4fjqVxRku4Xi7By YiS6U3jeonxaFNPbMT83ihaXc6eX/exIotwuQoDt/WDBId7nUhZbEC9jEqvlc8ikl4AQ KOTd41NHeMWUCF2Dg7r56FsABJwdmU1NZ72sBuEEqqdeKnMdNfrdj/9iQq2LzKaosplr hAC232JS3B43leablPeUM8hxRkbAsGBs+UYAf51jXBeXh1SzFTBT/tPLdXTKRjSewhBv 7DaeH5chbzOTuY/V7Vq/F8LxMAMkgelzhGo2+dEQ18hzESGTZZEp7Vx8UxFhPwuKEdMT 5PmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694544358; x=1695149158; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=KxsKqPZq5p15xyDVXXLvft8EHyxkBVs3E9jtZwaSo4E=; b=bn+59xeS+X3OnerE/96ygX9AzWTSdsegd4oZP2XjAW97iQStRb9wk0gO3APx45DDs5 5+W/gSTUWTanbldvQjb93O2x9L3nTzficmTJK1DHze+iWk4O2Mtqthlmw3BxCF2r/JEd NVoN6lDHW9VamI0oYNK3Q2gGvKgRa08o6zRHiOZk+qpHDgQcAHuIM06tnavO+XkwqXGh Z0LjLflGbKNx673T17+XE3Tbf+B9iolUkNx9l4NSI9QOegailaGnZCmE3PO1Z9VBIMEW IIqTiv8pQkBSOjXXLxqGrjABvcfR2t1qTEuaRzvyiqHx+Zs6+o3jV3tfaSkCZTYccnAn 6Xgw== X-Gm-Message-State: AOJu0YwGYYuIMs4spMbJgq3gcDL2daYpQjrZ6XQeRz7IBozm/MKVbKKI sVm6ouQC0HOWYVFRqZ/eGNssPqC/5gza X-Received: from mizhang-super.c.googlers.com ([34.105.13.176]) (user=mizhang job=sendgmr) by 2002:a81:ac55:0:b0:581:3899:91bc with SMTP id z21-20020a81ac55000000b00581389991bcmr10628ywj.6.1694544358303; Tue, 12 Sep 2023 11:45:58 -0700 (PDT) Reply-To: Mingwei Zhang Date: Tue, 12 Sep 2023 18:45:48 +0000 In-Reply-To: <20230912184553.1887764-1-mizhang@google.com> Mime-Version: 1.0 References: <20230912184553.1887764-1-mizhang@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230912184553.1887764-2-mizhang@google.com> Subject: [PATCH v4 1/6] KVM: Documentation: Add the missing description for guest_mode in kvm_mmu_page_role From: Mingwei Zhang To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mingwei Zhang , Kai Huang , Jim Mattson , David Matlack , Ben Gardon , Xu Yilun , Zhi Wang , Randy Dunlap Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 12 Sep 2023 11:46:49 -0700 (PDT) X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1776872113749965446 X-GMAIL-MSGID: 1776872113749965446 Add the missing description for guest_mode in kvm_mmu_page_role description. guest_mode tells KVM whether a shadow page is used for the L1 or an L2. Update the missing field in documentation. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 26f62034b6f3..23c20455d4e7 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -202,6 +202,8 @@ Shadow pages contain the following information: Is 1 if the MMU instance cannot use A/D bits. EPT did not have A/D bits before Haswell; shadow EPT page tables also cannot use A/D bits if the L1 hypervisor does not enable them. + role.guest_mode: + Indicates the shadow page is created for a nested guest. role.passthrough: The page is not backed by a guest page table, but its first entry points to one. This is set if NPT uses 5-level page tables (host From patchwork Tue Sep 12 18:45:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mingwei Zhang X-Patchwork-Id: 138483 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9ecd:0:b0:3f2:4152:657d with SMTP id t13csp742236vqx; Tue, 12 Sep 2023 16:30:31 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGpCOYbeSlXBZkuoCzUaW7NLgQOGZniYTbGbHn1QyP1b4PzkMb66sCPDlhHvJoXllVggJj0 X-Received: by 2002:a17:902:d70a:b0:1b8:76fc:5bf6 with SMTP id w10-20020a170902d70a00b001b876fc5bf6mr1145077ply.43.1694561431730; Tue, 12 Sep 2023 16:30:31 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694561431; cv=none; d=google.com; s=arc-20160816; b=Roft6rplqNf8byRusWUXqoLJJpJwS0fu92opm+NygK260VznDIWGkBDAbv1xdOlLuQ ikiNeysom+oTIawik9glbAdeIavl6H1Qd+EZ6ATI5yoa39empj+zEaHzMJ100rVwu78W /YGhmk0B9XByZf/eyRD3M/rhCyV+utEK7HNvBk2dS7rqe1Ccs0EcGyUu3ABQHvmk+qxy MJIYQlBrqmtXdfPNmRBHov641xwGKUYpLhfxHBT1+u54aB66n+O5HriDp0Yh6zhUogH5 BM5+T/MWQtyIVnSFuQqvtprJWbNND9fUQWlU4Mzqo22WO/0wXg2fyiOyJMGfyrqQBcvl X7dQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:reply-to:dkim-signature; bh=qTWRNy0B9f+ysXrRobFDRO6uVjKtmJ5Zj+3oA+uRqFw=; fh=oepeMie6ME0MwNRfBVLnM5ecOy8V5MJ/o7dp7J50CP0=; b=NcyTOauPWEFGFqrOaTbegp+gLxXK2OoKdlfqlAVvZYWVsd4hHI2hQhfP4QxF6atOqO CGz7aoKEHZL118SJMy5aHoLwTkZBqQLmWKDVD0ZyUiFSaU3tf0Inb6QBJyBWbm17DZwi ETQM+9ppjsOwINsuPt+UUdW0jECO/jhQzJGgx1ALaIU/66HnVX2zyBCMeS0buZJunYLt W9tdu0E0gnFtsDbIDq8HGutgy5dhXW4+rD5gqn3NHYHcox40t+j422OkHXiTIn1tDCjs hw8hAfwkeLMX8AHkbQI9uQE3FVJfeMVaJSXRHjOp+Q7n70qBfLJ2GBil75BEfwoNvgQa ovIQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=SCrNki8J; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from lipwig.vger.email (lipwig.vger.email. [2620:137:e000::3:3]) by mx.google.com with ESMTPS id n13-20020a170903110d00b001bbcddc33dasi9202993plh.180.2023.09.12.16.30.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Sep 2023 16:30:31 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=SCrNki8J; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by lipwig.vger.email (Postfix) with ESMTP id 63B0F8160387; Tue, 12 Sep 2023 11:46:25 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237520AbjILSqI (ORCPT + 36 others); Tue, 12 Sep 2023 14:46:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52804 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237472AbjILSqE (ORCPT ); Tue, 12 Sep 2023 14:46:04 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9A0210D3 for ; Tue, 12 Sep 2023 11:46:00 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-59224c40275so65957377b3.3 for ; Tue, 12 Sep 2023 11:46:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694544360; x=1695149160; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=qTWRNy0B9f+ysXrRobFDRO6uVjKtmJ5Zj+3oA+uRqFw=; b=SCrNki8Jh/KDjueh7CYSf8v07IBDd9cSO/+obsBUIryLQl7iWKfUYdvrOP/lP4xd12 pUB6Q9ptoCMePKL0iBY3/KqftWHmf2MpHdnvDsGEKJwgQvlMGH0+lpOa/Xyz01zV/PIR rhn8WPzS6ljB3+62B7C3ZQ+Ish0RWVTcq376F5xXgAZt8TgiQRwhzalmvzjTRDa7fMJz TqfjDKafiSVCk6Wro+5heXmfd3NbS6aXrDYiZU5c47CdyEM+QU39EofFWnrAoUs+u2yQ yB2dGwwl9pz2fSygR3HGud1CQUHAv+bh5xXalmEOZq00EyvEIOc8EWW5hgQtMBrvmbDz zajg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694544360; x=1695149160; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=qTWRNy0B9f+ysXrRobFDRO6uVjKtmJ5Zj+3oA+uRqFw=; b=k8rcEhUtx51oo+0poVQqAh88xnDfl+FIF9SC7dq/ZpzDDZ2qw1bvlJSH5tJexzLIbb Lqlgdqhn0YPzowEqKyLSHeqi7lrPSXwQfZrN2v+YA51Spq9r9AbEgHF831NXcVxYjoIN RSeq1LyTe7F8nC/yn03rxxtWl5JhDbODRR6x5q4D1lx8GEGKoNEYQw2e2V+pjjZwXJV0 9Qe+XSKvYASbHQr+elBlZI28YiL+V1PtVIGOg1WdM7C4CLroumXJolHj5z8TRExMYxWm JYyGKNEX8f8SmBTbGJJg6EqhCj5g4HJ/IT3CM8qH08bPh9dnVk36VqUu9S7IV7aT/9b9 x9kQ== X-Gm-Message-State: AOJu0Yw6BwktWVF83AnOyzeno/yrcDHDFENqNmIiEzkHx/q1jSbQHNy4 81vdj5EKbTWxVCQZqJsQJ70in53kFnZa X-Received: from mizhang-super.c.googlers.com ([35.247.89.60]) (user=mizhang job=sendgmr) by 2002:a25:949:0:b0:d80:ff9:d19e with SMTP id u9-20020a250949000000b00d800ff9d19emr4790ybm.9.1694544360050; Tue, 12 Sep 2023 11:46:00 -0700 (PDT) Reply-To: Mingwei Zhang Date: Tue, 12 Sep 2023 18:45:49 +0000 In-Reply-To: <20230912184553.1887764-1-mizhang@google.com> Mime-Version: 1.0 References: <20230912184553.1887764-1-mizhang@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230912184553.1887764-3-mizhang@google.com> Subject: [PATCH v4 2/6] KVM: Documentation: Update the field name gfns and its description in kvm_mmu_page From: Mingwei Zhang To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mingwei Zhang , Kai Huang , Jim Mattson , David Matlack , Ben Gardon , Xu Yilun , Zhi Wang , Randy Dunlap Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 12 Sep 2023 11:46:25 -0700 (PDT) X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1776876447846334829 X-GMAIL-MSGID: 1776876447846334829 Update the field 'gfns' in kvm_mmu_page to 'shadowed_translation' to be consistent with the code. Also update the corresponding 'gfns' in the comments. The more detailed description of 'shadowed_translation' is already inlined in the data structure definition, so no need to duplicate the text but simply just update the names. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 23c20455d4e7..f659f282357d 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -221,11 +221,14 @@ Shadow pages contain the following information: at __pa(sp2->spt). sp2 will point back at sp1 through parent_pte. The spt array forms a DAG structure with the shadow page as a node, and guest pages as leaves. - gfns: - An array of 512 guest frame numbers, one for each present pte. Used to - perform a reverse map from a pte to a gfn. When role.direct is set, any - element of this array can be calculated from the gfn field when used, in - this case, the array of gfns is not allocated. See role.direct and gfn. + shadowed_translation: + An array of 512 shadow translation entries, one for each present pte. Used + to perform a reverse map from a pte to a gfn as well as its access + permission. When role.direct is set, the shadow_translation array is not + allocated. This is because the gfn contained in any element of this array + can be calculated from the gfn field when used. In addition, when + role.direct is set, KVM does not track access permission for each of the + gfn. See role.direct and gfn. root_count: A counter keeping track of how many hardware registers (guest cr3 or pdptrs) are now pointing at the page. While this counter is nonzero, the From patchwork Tue Sep 12 18:45:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mingwei Zhang X-Patchwork-Id: 138879 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9ecd:0:b0:3f2:4152:657d with SMTP id t13csp1146269vqx; Wed, 13 Sep 2023 08:01:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEdD5TZb7gQt08o6S1RI8KIXOBgjao+IhaAVcBL19C1T57+x2wKM8FhyFoQiYwuzX3nYi5R X-Received: by 2002:a05:6a00:1821:b0:68a:4102:e483 with SMTP id y33-20020a056a00182100b0068a4102e483mr9872502pfa.14.1694617296677; Wed, 13 Sep 2023 08:01:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694617296; cv=none; d=google.com; s=arc-20160816; b=kaZeHFodFsPHZ0XhhjzGiS57UTRQxW2UPITVSzOKgmUjrCJqSN1lj3yHm6fEymSa55 xwgzzE5CmpX8v1+K5se25fp2ctDNfptW3/EGxFOZXDnsoJZbEpoXHbj4Fz+f6TaNMvZm WDb3B1+9hKf4pDyBPvp2Trz7skiY/Lo8x+TT33miDAfU0cBky6mghg64hEbFayfQQVV6 07BmcZ+JEEevg/n1cNGlRMayIU96DlJ1pyTGA0U2NGwC803QfKI3TU2NuPdVkDjO5jf2 wcTNEZsfs8l3+74+/cjIAy4w9zPOANGieAZSuLHcY5a9n2nzUvsUHtiTWNbcINjd7Pc6 gfTA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:reply-to:dkim-signature; bh=mMn9wfgwSNeBQXqC1xBrAj9DL3zD7p3ffh9VRzzCD10=; fh=oepeMie6ME0MwNRfBVLnM5ecOy8V5MJ/o7dp7J50CP0=; b=GbDX1jPsum5V9/dXFcREJdw6nlKTn+T5Z0CLyKfq3JRQJLx5V8EVRc5oMws2KSHtLh 8ZCFVAxpNh5FaOXP8hLNCSRdP05Qli1f991hXR+83RKPHWrnT9TNwujF9EinDKcMAStO HYsGTACDJdopVK2C0YrQ1JaHEZRgX6I9pw/+zIjHFUdGGlm29pk3k4I9QdElpKXU7KG3 bW+sJ1NWH0Qxy40IjWg7vPNl4cb4OcJAl+PS8KgcJ1wf4k+MHGbIl585mz2Qc8dhoSko qFlNMk8an0OkboWj6xqWi8pbHfQvnHxZxus8xR3GSDXcLjJfLx3lBjh/EwYCSi3aUFYN h3ZA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=S3Rp41f5; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from snail.vger.email (snail.vger.email. [2620:137:e000::3:7]) by mx.google.com with ESMTPS id t64-20020a638143000000b0056a1ed17deasi9797877pgd.675.2023.09.13.08.01.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Sep 2023 08:01:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=S3Rp41f5; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id A0CC4801BFDE; Tue, 12 Sep 2023 11:46:28 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237528AbjILSqJ (ORCPT + 36 others); Tue, 12 Sep 2023 14:46:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237489AbjILSqG (ORCPT ); Tue, 12 Sep 2023 14:46:06 -0400 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FE2A10EF for ; Tue, 12 Sep 2023 11:46:02 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id 98e67ed59e1d1-26f49625bffso7076580a91.1 for ; Tue, 12 Sep 2023 11:46:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694544362; x=1695149162; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=mMn9wfgwSNeBQXqC1xBrAj9DL3zD7p3ffh9VRzzCD10=; b=S3Rp41f5pj9Xq0M0JICGfaFghn6ICKnxgTM9yCGAeXmGyJlC44I732tpv1fT+chYcQ ZDtTodqENBFq1gDBu65cXYQvK9sjFeu+gm/exz1DJ3Rvpqhcz6hbBkrI0hSn9j/4eUE8 CJq9qtA0y6x3jnfuta+LmY5WQeTrbxalxrFavt4DsyRKKQ2rFTrvZEwyDp9sNlCNp6oV daau+6OQLLmTIq3dNVmRIohVO9tVZkThMw3Gyh3VrtML9u+e05ppukjKjI7ElQlo4Y8F TtQzpcBTL7Hm4Kv0g9CJJLm2SlwkKZHsFMrwu6T383d+kYoZwAK8ZhngosHyqRYq6Xsd FPXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694544362; x=1695149162; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=mMn9wfgwSNeBQXqC1xBrAj9DL3zD7p3ffh9VRzzCD10=; b=ngTTMOhPSxrPZXUF70BzX2Hd8oJYWe0dNfMovuodeqPqsa9osNEqpM3/RkFog0Kmnp uDX8sqUH2wN71niyViFYJvYIcbukvXo+v0OoWJgJsPMGYJSSlvIXBWXXodNOkF2zvp/x ZRM5DMDLa9jTq0esiBDoZvIqzL6V3FrNdpjjDjtJ0bLD4X6Mp5zW1sfdmSNTlcaTLyCm 4Y61v027uk0ZdKSHwgNih4H37grxTtrsqTovpL/4cSuIKaQuk6BsH9J0eKmx3bRV99OV 8YjBPcleyca56UA/NTqRWUxuUpjQssZVssiQ7GnXVAZZrUQbr0KFztbq1WKh0/KcvCrv ghQQ== X-Gm-Message-State: AOJu0Yx6IjKuaCITMoPx9BmvX6KHxomH/0u8SzCXf1zNjNX+qmsxzeKm ysudZFnFu/4cV93YbSgQq3IjbHZxSihF X-Received: from mizhang-super.c.googlers.com ([35.247.89.60]) (user=mizhang job=sendgmr) by 2002:a17:90b:110a:b0:268:2de3:e6b2 with SMTP id gi10-20020a17090b110a00b002682de3e6b2mr2664pjb.5.1694544361761; Tue, 12 Sep 2023 11:46:01 -0700 (PDT) Reply-To: Mingwei Zhang Date: Tue, 12 Sep 2023 18:45:50 +0000 In-Reply-To: <20230912184553.1887764-1-mizhang@google.com> Mime-Version: 1.0 References: <20230912184553.1887764-1-mizhang@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230912184553.1887764-4-mizhang@google.com> Subject: [PATCH v4 3/6] KVM: Documentation: Add the missing description for ptep in kvm_mmu_page From: Mingwei Zhang To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mingwei Zhang , Kai Huang , Jim Mattson , David Matlack , Ben Gardon , Xu Yilun , Zhi Wang , Randy Dunlap Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Tue, 12 Sep 2023 11:46:28 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1776935026653205940 X-GMAIL-MSGID: 1776935026653205940 Add the missing description for ptep in kvm_mmu_page description. ptep is used when TDP MMU is enabled and it shares the storage with parent_ptes. Update the doc to help readers to get up-to-date info. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index f659f282357d..22d221c180d7 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -239,6 +239,9 @@ Shadow pages contain the following information: parent_ptes points at this single spte, otherwise, there exists multiple sptes pointing at this page and (parent_ptes & ~0x1) points at a data structure with a list of parent sptes. + ptep: + The kernel virtual address of the SPTE that points at this shadow page. + Used exclusively by the TDP MMU, this field is a union with parent_ptes. unsync: If true, then the translations in this page may not match the guest's translation. This is equivalent to the state of the tlb when a pte is From patchwork Tue Sep 12 18:45:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mingwei Zhang X-Patchwork-Id: 138405 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9ecd:0:b0:3f2:4152:657d with SMTP id t13csp642676vqx; Tue, 12 Sep 2023 12:48:05 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHwjcvIHUboSsvZrdvK7IrKS72PoDyb2d5o+aJkn/KWnPaWhtg8oj/JfGeTt1XaQrfmGHaA X-Received: by 2002:a17:903:2289:b0:1b8:a67f:1c15 with SMTP id b9-20020a170903228900b001b8a67f1c15mr5197169plh.25.1694548085674; Tue, 12 Sep 2023 12:48:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694548085; cv=none; d=google.com; s=arc-20160816; b=ErqKNgoQy0xUtvKOXcSmyVeJ06rcsYT0TlsveHKdlhrmSqAl91epI+XVoLGFMIo7V+ u+THBo+cqYeZdY8Gv2fXC6qTbblcPypBJleF8/33+xLmk/Oquk3tOkv4x9n+Ni/fViJ1 g0pjmWIxKLzDNqYZCcvsx43eRvqxBSq6XEClwMKeUkvV1S2i0h59QpMcZpomh7cG2YaR peFTM7iI6/facbMpslBUipfksnpe4cL2ZkIpOiyanpol6tKuB5wiJz86nxRAHddC2Igf qPSfon1HrErAFwKJkyS7H1A1M1xkGM31fY7bDRgsG3x9cnoRAgPVUitLWgcvoVZRSi5n mqrw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:reply-to:dkim-signature; bh=1yc1t1cPhcaHcfI5EVv9bF1nMQXNiuICbyEqqARRk08=; fh=oepeMie6ME0MwNRfBVLnM5ecOy8V5MJ/o7dp7J50CP0=; b=AovKNkMW/9TEbgmlGKaPLNobK/5kf/sC1XW3zH+UxRNEb9Yd/u2yYL1saQ40Rdy/Hn jTdZ2+w9Tz0vKdoRH1DUJ0fByPrROk1E+h5belR4/sUaKoihP37ivYMLe5oEKBNunqTd jIt4NWxxQsFNt20NOv3xTT9N7HR9URQkCmf8t5hd5i733XbdEDc94OSfNDU6hsrpjnSy kkPg2LdkV+sevjLb81hYvp6n7Bi0inJTHlwrGwpnAnsQQSJaNjMwHKLQsDrdQa0w8zQU Jo9gth1+e2GY1iwbCikHWcEc60OGp1CiX6/mawjrpRHbtuv2eoniCesEZuCEd9QYBtxG 2PcQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b="0D+IFsg/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:1 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from morse.vger.email (morse.vger.email. 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Update the doc. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 22d221c180d7..4a82fa016833 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -229,10 +229,13 @@ Shadow pages contain the following information: can be calculated from the gfn field when used. In addition, when role.direct is set, KVM does not track access permission for each of the gfn. See role.direct and gfn. - root_count: - A counter keeping track of how many hardware registers (guest cr3 or - pdptrs) are now pointing at the page. While this counter is nonzero, the - page cannot be destroyed. See role.invalid. + root_count / tdp_mmu_root_count: + root_count is a reference counter for root shadow pages in Shadow MMU. + vCPUs elevate the refcount when getting a shadow page that will be used as + a root page, i.e. page that will be loaded into hardware directly (CR3, + PDPTRs, nCR3 EPTP). Root pages cannot be destroyed while their refcount is + non-zero. See role.invalid. tdp_mmu_root_count is similar but exclusively + used in TDP MMU as an atomic refcount. parent_ptes: The reverse mapping for the pte/ptes pointing at this page's spt. If parent_ptes bit 0 is zero, only one spte points at this page and From patchwork Tue Sep 12 18:45:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mingwei Zhang X-Patchwork-Id: 138409 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9ecd:0:b0:3f2:4152:657d with SMTP id t13csp645723vqx; Tue, 12 Sep 2023 12:55:44 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGLlhqEDLJo5Upf5CVZJmpugLxjdvNl+Mykk5uWKL71Dr0jszxGVzCqTQHhKm4zw4mfK5Ck X-Received: by 2002:a17:902:6906:b0:1c3:61d9:2b32 with SMTP id j6-20020a170902690600b001c361d92b32mr683295plk.45.1694548543723; Tue, 12 Sep 2023 12:55:43 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694548543; cv=none; d=google.com; s=arc-20160816; b=T2M9kEXqXHdL9uRGZBhDKS+ZrWwCjpwIzsXZljN0AqL2D413Mj8Y5WhT9l/xIKQBHP ngHcetpebkCle1xCrpWbvU6rgUMModb8nbeaDwxgw687tIQrurLhGEvnVbDZIXsIEDN1 CwE46VhkrgKyYF9a9nf04KycMFDdByOjkP1ZdTIR0/qRDp2rWIHhmUHCYV1o6GWfoK3h M8PsgAiWwNsmiS7i2j2ohFHDfyGUpOLE7hMyFIWIeN5LT1Ilnez2nxgXggh2yMLnF4k7 b9ZM/VYZaZUJxIaqrIqyqmy1aFzHfsJv4Pw6mpZA8xzdp496B6FOjbRSC8BhmM2+cJFq ypTQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:reply-to:dkim-signature; bh=XcIQx89b7EXA4Jd30psh2om9W5cX9cr0aEmWIDQQPw0=; fh=oepeMie6ME0MwNRfBVLnM5ecOy8V5MJ/o7dp7J50CP0=; b=i1SkUkpdkyzZyaYZg5xi9BxCzpLuMIedxyXLVyePJOvloKmsKBMF++dc/iuz/ns5hO pVbGU0kxzN246igFYx03dcBusq+OfFkBIFmCAIXNIhYl83/O+9NqeGLZcTLLlMp/p0P0 S1p4/aN+KMe/M8gyhmYTG8EI/1re5pGYz/DMXSK8qLXF2PSefTEI0Lz77kLZ8B56IChP 1kTKoIU688qC0+7+Yb7RqwIVsOl1KYBY/g+QSIIs2ZytMWoB/ZcdqlE8qlgNVjv0WIvw l0Tyv5obHboUyzASa92SQp1qOJF22reohJHYKxFTPiPooU/L7ohrW77Otg+XhvCd+xaZ Zlxw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=kZrO76ab; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from lipwig.vger.email (lipwig.vger.email. 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Update the doc to reflect that. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 4a82fa016833..16d5d6a1c174 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -208,6 +208,16 @@ Shadow pages contain the following information: The page is not backed by a guest page table, but its first entry points to one. This is set if NPT uses 5-level page tables (host CR4.LA57=1) and is shadowing L1's 4-level NPT (L1 CR4.LA57=0). + mmu_valid_gen: + The MMU generation of this page, used to fast zap of all MMU pages within a + VM without blocking vCPUs too long. Specifically, KVM updates the per-VM + valid MMU generation which causes the mismatch of mmu_valid_gen for each mmu + page. This makes all existing MMU pages obsolete. Obsolete pages can't be + used. Therefore, vCPUs must load a new, valid root before re-entering the + guest. The MMU generation is only ever '0' or '1'. Note, the TDP MMU doesn't + use this field as non-root TDP MMU pages are reachable only from their + owning root. Thus it suffices for TDP MMU to use role.invalid in root pages + to invalidate all MMU pages. gfn: Either the guest page table containing the translations shadowed by this page, or the base page frame for linear translations. See role.direct. 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Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang --- Documentation/virt/kvm/x86/mmu.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 16d5d6a1c174..82c5c6a6da2c 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -282,6 +282,10 @@ Shadow pages contain the following information: since the last time the page table was actually used; if emulation is triggered too frequently on this page, KVM will unmap the page to avoid emulation in the future. + tdp_mmu_page: + Is 1 if the shadow page is a TDP MMU page. This variable is used to + bifurcate the control flows for KVM when walking any data structure that may + contain pages from both TDP MMU and shadow MMU. Reverse map ===========