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[174.91.135.175]) by smtp.gmail.com with ESMTPSA id t24sm2001083qto.23.2021.03.24.11.39.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Mar 2021 11:39:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616611205; 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=T1Jntt8jjTHAaR26UjFByLuJS6U0C8B8GRy9fsEcFe4=; b=g7FE6l6jab0Cano+/IbTGyOdHOtexQgkrLa1o65xiSjzQm/WNCqxxAIWNDD8np/3peuDZq ljDfIsZirhO6F4LIw7gt1XOQkPPOx7rT1Ry3G1Lb/6kmRvCltn/W1/art8cAQHsxIyCPvo YTyarQIU/O12RKHF2hqR4TAKEkXetEY= X-MC-Unique: kQumSyFkO7adtIqTIpPr2Q-1 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=T1Jntt8jjTHAaR26UjFByLuJS6U0C8B8GRy9fsEcFe4=; b=mN5ocTFpH2/0HH4I6CsrR2ca+uYcbuv6DmpjwcAdqLLMJDrTGNdWw/HODanHIfZy68 9LMVsOcvmWf5ykSFbAmCRK+vOxFylMR68IehQTedaSQLAo++WaHf6ZLvtN/z+yBISHHu KBcYdMJytzulRMTyT6W3ebd3+5MQdekT2O5QMzNI1QuHyNiFEV5ugf1Acp56/jHyslx9 aTAGcF1eBAJ/wCt6ofKQOTv303Kob5iXl0lqooGz03a8AI4wKPUNfYGYLLVqmVZAUEfd RvvSNJB3FEbjVdJSF6LFNSpgCCice5XwJ9WwRgKVDsuZWhed83n2KwIY8ZyHNoJbwNLp bkYw== X-Gm-Message-State: AOAM530RiUDf3QGTnwDdsZt971HUIKx3LcIvkR/HYejltvit2q4RjKRS ygw6+CD50INwXlu78bvEUELhmmaugN4CxXhDlwzQRxjLYgsYKt/9y6C654Bcvb+zbFn4f7RUXF+ yAEh6Zh9wpBzpW8BlrcO5LS++i8RRq30aqtM3b1IpAEOjVKm9WUE9eOSjnnSwOusu X-Received: by 2002:ac8:4f4b:: with SMTP id i11mr4292325qtw.284.1616611200774; Wed, 24 Mar 2021 11:40:00 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxWd+asMriWav9qc1AMWEU0GLZUaPzZ8NT7XTaU/4a5Lrn+wAeQrSIeqh5FFZf/vapw5ySb8A== X-Received: by 2002:ac8:4f4b:: with SMTP id i11mr4292301qtw.284.1616611200468; Wed, 24 Mar 2021 11:40:00 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Subject: [PATCH v6 02/10] KVM: Use a big lock to replace per-kml slots_lock Date: Wed, 24 Mar 2021 14:39:46 -0400 Message-Id: <20210324183954.345629-3-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210324183954.345629-1-peterx@redhat.com> References: <20210324183954.345629-1-peterx@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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: Paolo Bonzini , Keqian Zhu , Hyman , "Dr . David Alan Gilbert" , peterx@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Per-kml slots_lock will bring some trouble if we want to take all slots_loc= k of all the KMLs, especially when we're in a context that we could have taken s= ome 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 wil= l be the same as before. Signed-off-by: Peter Xu --- 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 b6d9f92f151..766a7ad8c72 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -174,8 +174,10 @@ typedef struct KVMResampleFd KVMResampleFd; static QLIST_HEAD(, KVMResampleFd) kvm_resample_fd_list =3D QLIST_HEAD_INITIALIZER(kvm_resample_fd_list); =20 -#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) =20 static inline void kvm_resample_fd_remove(int gsi) { @@ -241,9 +243,9 @@ bool kvm_has_free_slot(MachineState *ms) bool result; KVMMemoryListener *kml =3D &s->memory_listener; =20 - kvm_slots_lock(kml); + kvm_slots_lock(); result =3D !!kvm_get_free_slot(kml); - kvm_slots_unlock(kml); + kvm_slots_unlock(); =20 return result; } @@ -309,7 +311,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, voi= d *ram, KVMMemoryListener *kml =3D &s->memory_listener; int i, ret =3D 0; =20 - kvm_slots_lock(kml); + kvm_slots_lock(); for (i =3D 0; i < s->nr_slots; i++) { KVMSlot *mem =3D &kml->slots[i]; =20 @@ -319,7 +321,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, voi= d *ram, break; } } - kvm_slots_unlock(kml); + kvm_slots_unlock(); =20 return ret; } @@ -515,7 +517,7 @@ static int kvm_section_update_flags(KVMMemoryListener *= kml, return 0; } =20 - kvm_slots_lock(kml); + kvm_slots_lock(); =20 while (size && !ret) { slot_size =3D MIN(kvm_max_slot_size, size); @@ -531,7 +533,7 @@ static int kvm_section_update_flags(KVMMemoryListener *= kml, } =20 out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } =20 @@ -812,7 +814,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *km= l, return ret; } =20 - kvm_slots_lock(kml); + kvm_slots_lock(); =20 for (i =3D 0; i < s->nr_slots; i++) { mem =3D &kml->slots[i]; @@ -838,7 +840,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *km= l, } } =20 - kvm_slots_unlock(kml); + kvm_slots_unlock(); =20 return ret; } @@ -1143,7 +1145,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, ram =3D memory_region_get_ram_ptr(mr) + section->offset_within_region + (start_addr - section->offset_within_address_space); =20 - kvm_slots_lock(kml); + kvm_slots_lock(); =20 if (!add) { do { @@ -1201,7 +1203,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, } while (size); =20 out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); } =20 static void kvm_region_add(MemoryListener *listener, @@ -1228,9 +1230,9 @@ static void kvm_log_sync(MemoryListener *listener, KVMMemoryListener *kml =3D container_of(listener, KVMMemoryListener, l= istener); int r; =20 - kvm_slots_lock(kml); + kvm_slots_lock(); r =3D kvm_physical_sync_dirty_bitmap(kml, section); - kvm_slots_unlock(kml); + kvm_slots_unlock(); if (r < 0) { abort(); } @@ -1330,7 +1332,6 @@ void kvm_memory_listener_register(KVMState *s, KVMMem= oryListener *kml, { int i; =20 - qemu_mutex_init(&kml->slots_lock); kml->slots =3D g_malloc0(s->nr_slots * sizeof(KVMSlot)); kml->as_id =3D as_id; =20 @@ -2003,6 +2004,8 @@ static int kvm_init(MachineState *ms) int type =3D 0; uint64_t dirty_log_manual_caps; =20 + qemu_mutex_init(&kml_slots_lock); + s =3D KVM_STATE(ms->accelerator); =20 /* diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h index ccb8869f01b..1da30e18841 100644 --- a/include/sysemu/kvm_int.h +++ b/include/sysemu/kvm_int.h @@ -27,8 +27,6 @@ typedef struct KVMSlot =20 typedef struct KVMMemoryListener { MemoryListener listener; - /* Protects the slots and all inside them */ - QemuMutex slots_lock; KVMSlot *slots; int as_id; } KVMMemoryListener; --=20 2.26.2