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=-13.3 required=3.0 tests=BAYES_00,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=no 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 9E34AC4338F for ; Fri, 13 Aug 2021 17:46:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7662660E9B for ; Fri, 13 Aug 2021 17:46:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230326AbhHMRqw (ORCPT ); Fri, 13 Aug 2021 13:46:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230160AbhHMRqu (ORCPT ); Fri, 13 Aug 2021 13:46:50 -0400 Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E68CC061756 for ; Fri, 13 Aug 2021 10:46:23 -0700 (PDT) Received: by mail-lj1-x22b.google.com with SMTP id h9so16705209ljq.8 for ; Fri, 13 Aug 2021 10:46:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=FPBviLCHTYpGAqgTfZCCThlPsy3SvDQxjuebC13p0iXhj0OeNzcrk8YOeVtI5XtpMF Uz75WPbJwSvlgpLB3W9qk6PHRin4VdhT9qA8BJG5ghCMldOJLsqDkm82fAq0EG8X/9BU 8X0Jhf6XqawQsbRgFF6RRyadIjhI2BKj4pTGDmuYTJyYsiQMyLxObkqnuD976ng/AB8v NgMtefW1nPUJFOW/t+mhBlXgdY58Unh1X9nWpqYWjWqlYtWMHQ7OFlwxbWE6Xg1lIYrk MK78YUyYD35s7G1H9/bmzRptli+3Oa4ZmwL653IleMYkjHZaiwFDmBcZfA+TZ/gXbrXs WVhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=WOUo3VEYN1QYNwoCkcioldnazKwMLnFibDc7S9/xvESH4vu5z0Shur30uyrAQnQ4PK P4d3dDKW6hZ+YPShG0eYYn2GUKmkgd/Z79fpDUeb3E8/XgevWM48jPJIw0zpY9zT4LVI KpDCQlcDP02dDGlXCoOjQ3EHlQ7JGWFiVgZSrRaWK57W1SG2TGTfRA+BDUVfQLQ3yvtG 6UlSejEEIwr5DaJ/HTKkVqqePkonauIUqRB53e5zrVVxYydfs64MiI/3iSYuaVkHDt+E vw9mfqo//9kWuww57lIo6A61oTI+yz6ePdVN1/6h71vgMnuQUVfT/3eyJlqPWb2wjuFz npCA== X-Gm-Message-State: AOAM5307mNdHjpXL21oqajH9a3b816OSEjQriBSONm6z9LGo2eC7gAxK zb046wj1wQpj2R5jo7Rr7xlVla9SRhqjIpfJ+A6Nyo/loT4= X-Google-Smtp-Source: ABdhPJx8HrYl3U2RpJvJAW94Qnm4I1248XWC/aFD75EZtnwMe+a7ZCPJypazWWRAKqrHLiT2BB63moMkioDJPlkcPDc= X-Received: by 2002:a2e:a5c1:: with SMTP id n1mr2653235ljp.65.1628876781486; Fri, 13 Aug 2021 10:46:21 -0700 (PDT) MIME-Version: 1.0 References: <20210804085819.846610-1-oupton@google.com> <20210804085819.846610-2-oupton@google.com> <78eeaf83-2bfa-8452-1301-a607fba7fa0c@redhat.com> <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> In-Reply-To: <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> From: Oliver Upton Date: Fri, 13 Aug 2021 10:46:10 -0700 Message-ID: Subject: Re: [PATCH v6 01/21] KVM: x86: Fix potential race in KVM_GET_CLOCK To: Paolo Bonzini Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Will Deacon , Catalin Marinas Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Aug 13, 2021 at 3:44 AM Paolo Bonzini wrote: > > On 13/08/21 12:39, Oliver Upton wrote: > > Might it make sense to fix this issue under the existing locking > > scheme, then shift to what you're proposing? I say that, but the > > locking change in 03/21 would most certainly have a short lifetime > > until this patch supersedes it. > > Yes, definitely. The seqcount change would definitely go in much later. > Extracting KVM_{GET,SET}_CLOCK to separate function would also be a > patch of its own. Give me a few more days of frantic KVM Forum > preparation. :) Sounds good :-) I'm probably going to send this out once more, in three separate series: - x86 (no changes, just rebasing) - arm64 (address some comments, bugs) - selftests (no changes) -- Thanks, Oliver > Paolo > 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=-3.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 B3066C4338F for ; Fri, 13 Aug 2021 17:46:30 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 2FA0F6103A for ; Fri, 13 Aug 2021 17:46:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2FA0F6103A Authentication-Results: mail.kernel.org; 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Fri, 13 Aug 2021 13:46:23 -0400 (EDT) Received: from mail-lj1-f176.google.com (mail-lj1-f176.google.com [209.85.208.176]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 0B0844086D for ; Fri, 13 Aug 2021 13:46:23 -0400 (EDT) Received: by mail-lj1-f176.google.com with SMTP id h11so16673923ljo.12 for ; Fri, 13 Aug 2021 10:46:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=FPBviLCHTYpGAqgTfZCCThlPsy3SvDQxjuebC13p0iXhj0OeNzcrk8YOeVtI5XtpMF Uz75WPbJwSvlgpLB3W9qk6PHRin4VdhT9qA8BJG5ghCMldOJLsqDkm82fAq0EG8X/9BU 8X0Jhf6XqawQsbRgFF6RRyadIjhI2BKj4pTGDmuYTJyYsiQMyLxObkqnuD976ng/AB8v NgMtefW1nPUJFOW/t+mhBlXgdY58Unh1X9nWpqYWjWqlYtWMHQ7OFlwxbWE6Xg1lIYrk MK78YUyYD35s7G1H9/bmzRptli+3Oa4ZmwL653IleMYkjHZaiwFDmBcZfA+TZ/gXbrXs WVhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=Ojfru4IJxLIDPZLRtHyJ7Ix9e8ob+JpFofIDBY4wiwBtbILl0dC2EeF27mF9H0mqnv 51c+HWk/jM7ZS/tx8vdso00PCJIwztJxfHYWwgiSKjvbHPlccyGRrb2l478QwV0YCopH 0dIvW39q/rBjCtReQFzAJxHMC/+s0GicC/fVwjsQnAGqhizzHo94Ko0HsNkHv5I46+oj kBAFbB1R2Gv+QMEds/bwOKQe5W0e57AIDyXHyiAX6at8u7zn94bST33/kzKAoPd4KW7E L8CewqzrvwNFZznEFnAcH9DRUdEXSMSo78Y4LQTkZggzD4LCjtr9wCLFttbTzkcvGowj UC1A== X-Gm-Message-State: AOAM533Jn1Us9ujUvbEHWbCsJj9uZ1Enuypce4HIqWrWnYExdu7eNjOL QI1hJudByE02wj6Fk29uxNtefWzhiOzRvb3fNYg8CA== X-Google-Smtp-Source: ABdhPJx8HrYl3U2RpJvJAW94Qnm4I1248XWC/aFD75EZtnwMe+a7ZCPJypazWWRAKqrHLiT2BB63moMkioDJPlkcPDc= X-Received: by 2002:a2e:a5c1:: with SMTP id n1mr2653235ljp.65.1628876781486; Fri, 13 Aug 2021 10:46:21 -0700 (PDT) MIME-Version: 1.0 References: <20210804085819.846610-1-oupton@google.com> <20210804085819.846610-2-oupton@google.com> <78eeaf83-2bfa-8452-1301-a607fba7fa0c@redhat.com> <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> In-Reply-To: <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> From: Oliver Upton Date: Fri, 13 Aug 2021 10:46:10 -0700 Message-ID: Subject: Re: [PATCH v6 01/21] KVM: x86: Fix potential race in KVM_GET_CLOCK To: Paolo Bonzini Cc: Catalin Marinas , kvm@vger.kernel.org, Will Deacon , Sean Christopherson , Raghavendra Rao Anata , Peter Shier , Marc Zyngier , David Matlack , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Jim Mattson X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Fri, Aug 13, 2021 at 3:44 AM Paolo Bonzini wrote: > > On 13/08/21 12:39, Oliver Upton wrote: > > Might it make sense to fix this issue under the existing locking > > scheme, then shift to what you're proposing? I say that, but the > > locking change in 03/21 would most certainly have a short lifetime > > until this patch supersedes it. > > Yes, definitely. The seqcount change would definitely go in much later. > Extracting KVM_{GET,SET}_CLOCK to separate function would also be a > patch of its own. Give me a few more days of frantic KVM Forum > preparation. :) Sounds good :-) I'm probably going to send this out once more, in three separate series: - x86 (no changes, just rebasing) - arm64 (address some comments, bugs) - selftests (no changes) -- Thanks, Oliver > Paolo > _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-4.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 7FC8DC4338F for ; Fri, 13 Aug 2021 17:48:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 42063610A4 for ; 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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mEbGE-00DI75-KG; Fri, 13 Aug 2021 17:46:26 +0000 Received: from mail-lj1-x235.google.com ([2a00:1450:4864:20::235]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mEbGB-00DI6g-RF for linux-arm-kernel@lists.infradead.org; Fri, 13 Aug 2021 17:46:25 +0000 Received: by mail-lj1-x235.google.com with SMTP id x7so16701787ljn.10 for ; Fri, 13 Aug 2021 10:46:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=FPBviLCHTYpGAqgTfZCCThlPsy3SvDQxjuebC13p0iXhj0OeNzcrk8YOeVtI5XtpMF Uz75WPbJwSvlgpLB3W9qk6PHRin4VdhT9qA8BJG5ghCMldOJLsqDkm82fAq0EG8X/9BU 8X0Jhf6XqawQsbRgFF6RRyadIjhI2BKj4pTGDmuYTJyYsiQMyLxObkqnuD976ng/AB8v NgMtefW1nPUJFOW/t+mhBlXgdY58Unh1X9nWpqYWjWqlYtWMHQ7OFlwxbWE6Xg1lIYrk MK78YUyYD35s7G1H9/bmzRptli+3Oa4ZmwL653IleMYkjHZaiwFDmBcZfA+TZ/gXbrXs WVhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f8Holqm94msH8zwwttqnwNNIb5GP1G9/99qvE2v+dcU=; b=G1EWgPpaWrFihjhZYdeRKKDCZtgF0VUCEt3nbj240/AN+MRK+XZwpR7Ksv4Mt0SPm/ PpN3+UmTxnok0c0c8HKQ1nlysuQ4qUJu5zk0w96yeSgtMtvEUE+IYMqEHwCJnPQzhNOA iNDh7Qu38nC/UqaVWyvxiQ210YLo9+JWCy38cTVsqUgzDnokcb+gUd3GFsKrILMGuKbC c3XuTBVE7tYHg6P5jYnBi+J5qd0vsqGrFZj16NOUCyU8riOccZo/VFLe9xxGSdIVUMwa C8/IhgdTgHBs309SwI01Ye1acvcZO8vzPL0FhjngQWfgeXKU4oseO1wCYgWBS62Z+AQi kjeA== X-Gm-Message-State: AOAM531x2YuCnOxBmtOHPcljMxRWtOVUQNPnlCaw8TxvDsLlvw552T8a 25Ur2Inl6YX2Zl5jpmqPvb+PKDUziwpRMVKtDkHCMA== X-Google-Smtp-Source: ABdhPJx8HrYl3U2RpJvJAW94Qnm4I1248XWC/aFD75EZtnwMe+a7ZCPJypazWWRAKqrHLiT2BB63moMkioDJPlkcPDc= X-Received: by 2002:a2e:a5c1:: with SMTP id n1mr2653235ljp.65.1628876781486; Fri, 13 Aug 2021 10:46:21 -0700 (PDT) MIME-Version: 1.0 References: <20210804085819.846610-1-oupton@google.com> <20210804085819.846610-2-oupton@google.com> <78eeaf83-2bfa-8452-1301-a607fba7fa0c@redhat.com> <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> In-Reply-To: <0b415872-7a67-d38b-ae01-62c38b365be0@redhat.com> From: Oliver Upton Date: Fri, 13 Aug 2021 10:46:10 -0700 Message-ID: Subject: Re: [PATCH v6 01/21] KVM: x86: Fix potential race in KVM_GET_CLOCK To: Paolo Bonzini Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Will Deacon , Catalin Marinas X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210813_104623_921161_94BC2982 X-CRM114-Status: GOOD ( 14.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 13, 2021 at 3:44 AM Paolo Bonzini wrote: > > On 13/08/21 12:39, Oliver Upton wrote: > > Might it make sense to fix this issue under the existing locking > > scheme, then shift to what you're proposing? I say that, but the > > locking change in 03/21 would most certainly have a short lifetime > > until this patch supersedes it. > > Yes, definitely. The seqcount change would definitely go in much later. > Extracting KVM_{GET,SET}_CLOCK to separate function would also be a > patch of its own. Give me a few more days of frantic KVM Forum > preparation. :) Sounds good :-) I'm probably going to send this out once more, in three separate series: - x86 (no changes, just rebasing) - arm64 (address some comments, bugs) - selftests (no changes) -- Thanks, Oliver > Paolo > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel