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=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 E80A0C432C1 for ; Wed, 25 Sep 2019 11:14:25 +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 A3FD821D7A for ; Wed, 25 Sep 2019 11:14:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A3FD821D7A 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 bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46db6l1ctFzDqj4 for ; Wed, 25 Sep 2019 21:14:23 +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 46dZwJ5t0TzDqZQ for ; Wed, 25 Sep 2019 21:05:20 +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 46dZwJ4fsTz9sPc; Wed, 25 Sep 2019 21:05:20 +1000 (AEST) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 3a83f677a6eeff65751b29e3648d7c69c3be83f3 In-Reply-To: <20190911223155.16045-1-mdroth@linux.vnet.ibm.com> To: Michael Roth , linuxppc-dev@lists.ozlabs.org From: Michael Ellerman Subject: Re: [PATCH v2] KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag Message-Id: <46dZwJ4fsTz9sPc@ozlabs.org> Date: Wed, 25 Sep 2019 21:05:20 +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: Nicholas Piggin , kvm-ppc@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, 2019-09-11 at 22:31:55 UTC, Michael Roth wrote: > On a 2-socket Power9 system with 32 cores/128 threads (SMT4) and 1TB > of memory running the following guest configs: ... > To handle both cases, this patch splits kvmppc_set_host_ipi() into > separate set/clear functions, where we execute smp_mb() prior to > setting host_ipi flag, and after clearing host_ipi flag. These > functions pair with each other to synchronize the sender and receiver > sides. > > With that change in place the above workload ran for 20 hours without > triggering any lock-ups. > > Fixes: 755563bc79c7 ("powerpc/powernv: Fixes for hypervisor doorbell handling") # v4.0 > Cc: Michael Ellerman > Cc: Paul Mackerras > Cc: Nicholas Piggin > Cc: kvm-ppc@vger.kernel.org > Signed-off-by: Michael Roth Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/3a83f677a6eeff65751b29e3648d7c69c3be83f3 cheers