From patchwork Thu Jul 15 13:15:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 1505690 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=PAgd5N/9; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4GQZcS6Kzsz9sXL for ; Thu, 15 Jul 2021 23:15:36 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237394AbhGONS3 (ORCPT ); Thu, 15 Jul 2021 09:18:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232518AbhGONS3 (ORCPT ); Thu, 15 Jul 2021 09:18:29 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3ADC4C06175F for ; Thu, 15 Jul 2021 06:15:35 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id 70so2870862pgh.2 for ; Thu, 15 Jul 2021 06:15:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=lY2yV6h+HiwueBZqXg6zldEZGTIaMkB1Z2ZLqlofoo0=; b=PAgd5N/9dQI1X81Og9aoffrN5ZKpyOEfk1nDRE530JLtivM8+1QGZs7rsyOwPVz4CC Vuo2BkjrUwQ7uJ3niifEulmmJSa45wJ4Uy/qSWJ1o8WwpU0z1wxKysWzsRMwrY8INIF/ tG8EbtyrD2M9V2jmP/UJVP92nXqlbhcxZW+6pKQGyTb37Mend2JYxE8/jTKx6XvOTQE1 cOjXrJdF9qTHYjyEnsFRg3blx6yjdIbNW/1JewLV90vkSO6JM1M5etSL8uoigrjsdaSX bb6fXkDkx5/wuIxDxmX+jGGhU1l/g70OPEWYY+69WC4ffhKJb+VwtJyBZMfh/vemGska csFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lY2yV6h+HiwueBZqXg6zldEZGTIaMkB1Z2ZLqlofoo0=; b=GyAJyj3RmLeqNBji7vOSbLq8cWebZJGCbRKjERkn2iWFJrDFOdWzwGpOi4lF5nhmnq NuAZwrqaC9Z3ErFKRsI+QHZNoPpMxSUTBTv3FyvJGzvIHAQCAyl10odg3DKNBAgQi13V dIJ4fue6afAjlt4jOXkJkb4QdFL5cZ/W/JwtV/kJA0wbMqRDM/n0OCw8Y/OQshYxahkG DOB/SdF7EDAJAbq3lmkcyVw0abjuSWIv6/jN9OGiWhG/purXwht+YDjJlO5ekhOP/9uC n9jrOIB6K2aGgELlQt+miRYm3b2XumqfodDf6aaaEiaeqsX0QDjLvFDU7auL3FRYZszX XvCQ== X-Gm-Message-State: AOAM531BWeO+1ZAnGOyRdHlAeRwbBX4Yv/NlRjMvah3e1CcsDHtWyb9d mUPCVS98Chl4HDgtukm2MetrsDQankLtJw== X-Google-Smtp-Source: ABdhPJweGLpwOhqDXva0BLe6sBSssb8SzCMoxm5+smIxE2O5VcQ4vM6lo95NW2vfXvIaNjlTpS25/A== X-Received: by 2002:a63:ee45:: with SMTP id n5mr4510309pgk.405.1626354934670; Thu, 15 Jul 2021 06:15:34 -0700 (PDT) Received: from bobo.ozlabs.ibm.com (27-33-83-114.tpgi.com.au. [27.33.83.114]) by smtp.gmail.com with ESMTPSA id k6sm4864216pju.8.2021.07.15.06.15.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Jul 2021 06:15:34 -0700 (PDT) From: Nicholas Piggin To: kvm-ppc@vger.kernel.org Cc: Nicholas Piggin , linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 4/6] KVM: PPC: Book3S HV P9: Tidy kvmppc_create_dtl_entry Date: Thu, 15 Jul 2021 23:15:16 +1000 Message-Id: <20210715131518.146917-5-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210715131518.146917-1-npiggin@gmail.com> References: <20210715131518.146917-1-npiggin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org This goes further to removing vcores from the P9 path. Also avoid the memset in favour of explicitly initialising all fields. Signed-off-by: Nicholas Piggin --- arch/powerpc/kvm/book3s_hv.c | 61 +++++++++++++++++++++--------------- 1 file changed, 35 insertions(+), 26 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 2b02cfe3e456..93ecbc040529 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -703,41 +703,30 @@ static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) return p; } -static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, - struct kvmppc_vcore *vc, u64 tb) +static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, + unsigned int pcpu, u64 now, + unsigned long stolen) { struct dtl_entry *dt; struct lppaca *vpa; - unsigned long stolen; - unsigned long core_stolen; - u64 now; - unsigned long flags; dt = vcpu->arch.dtl_ptr; vpa = vcpu->arch.vpa.pinned_addr; - now = tb; - - if (cpu_has_feature(CPU_FTR_ARCH_300)) { - stolen = 0; - } else { - core_stolen = vcore_stolen_time(vc, now); - stolen = core_stolen - vcpu->arch.stolen_logged; - vcpu->arch.stolen_logged = core_stolen; - spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); - stolen += vcpu->arch.busy_stolen; - vcpu->arch.busy_stolen = 0; - spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); - } if (!dt || !vpa) return; - memset(dt, 0, sizeof(struct dtl_entry)); + dt->dispatch_reason = 7; - dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid); - dt->timebase = cpu_to_be64(now + vc->tb_offset); + dt->preempt_reason = 0; + dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid); dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); + dt->ready_to_enqueue_time = 0; + dt->waiting_to_ready_time = 0; + dt->timebase = cpu_to_be64(now); + dt->fault_addr = 0; dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); + ++dt; if (dt == vcpu->arch.dtl.pinned_end) dt = vcpu->arch.dtl.pinned_addr; @@ -748,6 +737,27 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, vcpu->arch.dtl.dirty = true; } +static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, + struct kvmppc_vcore *vc) +{ + unsigned long stolen; + unsigned long core_stolen; + u64 now; + unsigned long flags; + + now = mftb(); + + core_stolen = vcore_stolen_time(vc, now); + stolen = core_stolen - vcpu->arch.stolen_logged; + vcpu->arch.stolen_logged = core_stolen; + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + stolen += vcpu->arch.busy_stolen; + vcpu->arch.busy_stolen = 0; + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); + + __kvmppc_create_dtl_entry(vcpu, vc->pcpu, now + vc->tb_offset, stolen); +} + /* See if there is a doorbell interrupt pending for a vcpu */ static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) { @@ -3722,7 +3732,7 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) pvc->pcpu = pcpu + thr; for_each_runnable_thread(i, vcpu, pvc) { kvmppc_start_thread(vcpu, pvc); - kvmppc_create_dtl_entry(vcpu, pvc, mftb()); + kvmppc_create_dtl_entry(vcpu, pvc); trace_kvm_guest_enter(vcpu); if (!vcpu->arch.ptid) thr0_done = true; @@ -4272,7 +4282,7 @@ static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) if ((vc->vcore_state == VCORE_PIGGYBACK || vc->vcore_state == VCORE_RUNNING) && !VCORE_IS_EXITING(vc)) { - kvmppc_create_dtl_entry(vcpu, vc, mftb()); + kvmppc_create_dtl_entry(vcpu, vc); kvmppc_start_thread(vcpu, vc); trace_kvm_guest_enter(vcpu); } else if (vc->vcore_state == VCORE_SLEEPING) { @@ -4449,8 +4459,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, local_paca->kvm_hstate.ptid = 0; local_paca->kvm_hstate.fake_suspend = 0; - vc->pcpu = pcpu; // for kvmppc_create_dtl_entry - kvmppc_create_dtl_entry(vcpu, vc, tb); + __kvmppc_create_dtl_entry(vcpu, pcpu, tb + vc->tb_offset, 0); trace_kvm_guest_enter(vcpu);