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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 19454C433ED for ; Mon, 17 May 2021 11:34:32 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 8E3656105A for ; Mon, 17 May 2021 11:34:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E3656105A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56304 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1libW2-0003aU-NQ for qemu-devel@archiver.kernel.org; Mon, 17 May 2021 07:34:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35980) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1libIZ-0006iM-LC for qemu-devel@nongnu.org; Mon, 17 May 2021 07:20:35 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:50108) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1libIX-0006an-Rp for qemu-devel@nongnu.org; Mon, 17 May 2021 07:20:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621250433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Nf7iOu58WlXIjh2eeppXFPgHiTuBy3d2Jq4Q87ynB80=; b=Ttpnaatygq4vNiIVLOCSSilOCYDQpD+iOspf0UgJqx5VGVsMTQ1e6Vqnz+bH1UnWcElwAk A6zAPMnREeOl+/Dao/5On6WiTAcBLAxR1+esn4SN7fRss4EC32cD2Geu4gvd3l5FgDq1Cm o5qJSKOGDpDAUoEXiYWO14AhFzLYgTI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-338-phbiHiOOP-S_AZcnTZDRvw-1; Mon, 17 May 2021 07:20:31 -0400 X-MC-Unique: phbiHiOOP-S_AZcnTZDRvw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C56F78042A8 for ; Mon, 17 May 2021 11:20:30 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6E6F75DDAD; Mon, 17 May 2021 11:20:27 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 12/20] KVM: Use a big lock to replace per-kml slots_lock Date: Mon, 17 May 2021 07:19:53 -0400 Message-Id: <20210517112001.2564006-13-pbonzini@redhat.com> In-Reply-To: <20210517112001.2564006-1-pbonzini@redhat.com> References: <20210517112001.2564006-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.374, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Xu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Peter Xu Per-kml slots_lock will bring some trouble if we want to take all slots_lock of all the KMLs, especially when we're in a context that we could have taken some of the KML slots_lock, then we even need to figure out what we've taken and what we need to take. Make this simple by merging all KML slots_lock into a single slots lock. Per-kml slots_lock isn't anything that helpful anyway - so far only x86 has two address spaces (so, two slots_locks). All the rest archs will be having one address space always, which means there's actually one slots_lock so it will be the same as before. Signed-off-by: Peter Xu Message-Id: <20210506160549.130416-3-peterx@redhat.com> Signed-off-by: Paolo Bonzini --- accel/kvm/kvm-all.c | 33 ++++++++++++++++++--------------- include/sysemu/kvm_int.h | 2 -- 2 files changed, 18 insertions(+), 17 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 54c0860979..f8980e155b 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -172,8 +172,10 @@ typedef struct KVMResampleFd KVMResampleFd; static QLIST_HEAD(, KVMResampleFd) kvm_resample_fd_list = QLIST_HEAD_INITIALIZER(kvm_resample_fd_list); -#define kvm_slots_lock(kml) qemu_mutex_lock(&(kml)->slots_lock) -#define kvm_slots_unlock(kml) qemu_mutex_unlock(&(kml)->slots_lock) +static QemuMutex kml_slots_lock; + +#define kvm_slots_lock() qemu_mutex_lock(&kml_slots_lock) +#define kvm_slots_unlock() qemu_mutex_unlock(&kml_slots_lock) static inline void kvm_resample_fd_remove(int gsi) { @@ -239,9 +241,9 @@ bool kvm_has_free_slot(MachineState *ms) bool result; KVMMemoryListener *kml = &s->memory_listener; - kvm_slots_lock(kml); + kvm_slots_lock(); result = !!kvm_get_free_slot(kml); - kvm_slots_unlock(kml); + kvm_slots_unlock(); return result; } @@ -307,7 +309,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram, KVMMemoryListener *kml = &s->memory_listener; int i, ret = 0; - kvm_slots_lock(kml); + kvm_slots_lock(); for (i = 0; i < s->nr_slots; i++) { KVMSlot *mem = &kml->slots[i]; @@ -317,7 +319,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram, break; } } - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -513,7 +515,7 @@ static int kvm_section_update_flags(KVMMemoryListener *kml, return 0; } - kvm_slots_lock(kml); + kvm_slots_lock(); while (size && !ret) { slot_size = MIN(kvm_max_slot_size, size); @@ -529,7 +531,7 @@ static int kvm_section_update_flags(KVMMemoryListener *kml, } out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -810,7 +812,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *kml, return ret; } - kvm_slots_lock(kml); + kvm_slots_lock(); for (i = 0; i < s->nr_slots; i++) { mem = &kml->slots[i]; @@ -836,7 +838,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *kml, } } - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -1141,7 +1143,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + (start_addr - section->offset_within_address_space); - kvm_slots_lock(kml); + kvm_slots_lock(); if (!add) { do { @@ -1199,7 +1201,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, } while (size); out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); } static void kvm_region_add(MemoryListener *listener, @@ -1226,9 +1228,9 @@ static void kvm_log_sync(MemoryListener *listener, KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); int r; - kvm_slots_lock(kml); + kvm_slots_lock(); r = kvm_physical_sync_dirty_bitmap(kml, section); - kvm_slots_unlock(kml); + kvm_slots_unlock(); if (r < 0) { abort(); } @@ -1328,7 +1330,6 @@ void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml, { int i; - qemu_mutex_init(&kml->slots_lock); kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot)); kml->as_id = as_id; @@ -2001,6 +2002,8 @@ static int kvm_init(MachineState *ms) int type = 0; uint64_t dirty_log_manual_caps; + qemu_mutex_init(&kml_slots_lock); + s = KVM_STATE(ms->accelerator); /* diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h index ccb8869f01..1da30e1884 100644 --- a/include/sysemu/kvm_int.h +++ b/include/sysemu/kvm_int.h @@ -27,8 +27,6 @@ typedef struct KVMSlot typedef struct KVMMemoryListener { MemoryListener listener; - /* Protects the slots and all inside them */ - QemuMutex slots_lock; KVMSlot *slots; int as_id; } KVMMemoryListener; -- 2.27.0