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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 0C7CCC5B57E for ; Sun, 30 Jun 2019 08:57:24 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 B6A6520449 for ; Sun, 30 Jun 2019 08:57:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B6A6520449 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45c4Bp0Sb6zDr6c for ; Sun, 30 Jun 2019 18:57:22 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45c3ly0B7rzDqLc for ; Sun, 30 Jun 2019 18:37:34 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 45c3lx4g6Kz9sNt; Sun, 30 Jun 2019 18:37:33 +1000 (AEST) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 869537709ebf1dc865e75c3fc97b23f8acf37c16 X-Patchwork-Hint: ignore In-Reply-To: <20190620014651.7645-2-sjitindarsingh@gmail.com> To: Suraj Jitindar Singh , linuxppc-dev@lists.ozlabs.org From: Michael Ellerman Subject: Re: [PATCH 2/3] KVM: PPC: Book3S HV: Signed extend decrementer value if not using large decr Message-Id: <45c3lx4g6Kz9sNt@ozlabs.org> Date: Sun, 30 Jun 2019 18:37:33 +1000 (AEST) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: clg@kaod.org, kvm-ppc@vger.kernel.org, sjitindarsingh@gmail.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, 2019-06-20 at 01:46:50 UTC, Suraj Jitindar Singh wrote: > On POWER9 the decrementer can operate in large decrementer mode where > the decrementer is 56 bits and signed extended to 64 bits. When not > operating in this mode the decrementer behaves as a 32 bit decrementer > which is NOT signed extended (as on POWER8). > > Currently when reading a guest decrementer value we don't take into > account whether the large decrementer is enabled or not, and this means > the value will be incorrect when the guest is not using the large > decrementer. Fix this by sign extending the value read when the guest > isn't using the large decrementer. > > Fixes: 95a6432ce903 "KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests" > > Signed-off-by: Suraj Jitindar Singh > Tested-by: Laurent Vivier Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/869537709ebf1dc865e75c3fc97b23f8acf37c16 cheers