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=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 2763FC7618B for ; Tue, 23 Jul 2019 15:46:14 +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 EDE3E223BA for ; Tue, 23 Jul 2019 15:46:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ebEn3Slo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDE3E223BA Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpwzU-0004ph-2e; Tue, 23 Jul 2019 15:46:12 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpwzK-0004mE-Ui for linux-arm-kernel@lists.infradead.org; Tue, 23 Jul 2019 15:46:05 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 997E528; Tue, 23 Jul 2019 08:45:57 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CABB33F71A; Tue, 23 Jul 2019 08:45:53 -0700 (PDT) Subject: Re: [PATCH v2 8/9] KVM: arm/arm64: vgic-its: Check the LPI translation cache on MSI injection To: Auger Eric , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190611170336.121706-1-marc.zyngier@arm.com> <20190611170336.121706-9-marc.zyngier@arm.com> <485d9990-a6ad-2be0-e829-a0290d7d6a6f@redhat.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <485d9990-a6ad-2be0-e829-a0290d7d6a6f@redhat.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190723_084603_253275_B41030CC X-CRM114-Status: GOOD ( 16.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Suzuki K Poulose , "Raslan, KarimAllah" , Julien Thierry , Christoffer Dall , James Morse , Zenghui Yu , "Saidi, Ali" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Eric, On 23/07/2019 16:10, Auger Eric wrote: > Hi Marc, > > On 6/11/19 7:03 PM, Marc Zyngier wrote: >> When performing an MSI injection, let's first check if the translation >> is already in the cache. If so, let's inject it quickly without >> going through the whole translation process. >> >> Signed-off-by: Marc Zyngier >> --- >> virt/kvm/arm/vgic/vgic-its.c | 36 ++++++++++++++++++++++++++++++++++++ >> virt/kvm/arm/vgic/vgic.h | 1 + >> 2 files changed, 37 insertions(+) >> >> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c >> index 62932458476a..83d80ec33473 100644 >> --- a/virt/kvm/arm/vgic/vgic-its.c >> +++ b/virt/kvm/arm/vgic/vgic-its.c >> @@ -577,6 +577,20 @@ static struct vgic_irq *__vgic_its_check_cache(struct vgic_dist *dist, >> return irq; >> } >> >> +static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db, >> + u32 devid, u32 eventid) >> +{ >> + struct vgic_dist *dist = &kvm->arch.vgic; >> + struct vgic_irq *irq; >> + unsigned long flags; >> + >> + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); >> + irq = __vgic_its_check_cache(dist, db, devid, eventid); >> + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); >> + >> + return irq; >> +} >> + >> static void vgic_its_cache_translation(struct kvm *kvm, struct vgic_its *its, >> u32 devid, u32 eventid, >> struct vgic_irq *irq) >> @@ -736,6 +750,25 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its, >> return 0; >> } >> >> +int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi) >> +{ >> + struct vgic_irq *irq; >> + unsigned long flags; >> + phys_addr_t db; >> + >> + db = (u64)msi->address_hi << 32 | msi->address_lo; >> + irq = vgic_its_check_cache(kvm, db, msi->devid, msi->data); > > I think we miss a check of its->enabled. This is currently done in > vgic_its_resolve_lpi() but now likely to be bypassed. But why would a translation be cached if the ITS is disabled? It should never haver been there the first place (vgic_its_resolve_lpi does check for the ITS being enabled, as you pointed out). Which makes me think that we miss an invalidate on an ITS being disabled: diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 2633b0e88981..5f2ad74ad834 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1719,6 +1719,8 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its, goto out; its->enabled = !!(val & GITS_CTLR_ENABLE); + if (!its->enabled) + vgic_its_invalidate_cache(kvm); /* * Try to process any pending commands. This function bails out early What do you think? M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel