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Tue, 17 Sep 2024 23:49:02 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHysm0eNTRSPiC0f2N5l9SEg6j9aCH62mHEh3RjWGZoKymFQhjstZ8NujqAiS4vntN7BKgfXQ== X-Received: by 2002:a05:6a00:3d4c:b0:717:90cd:7943 with SMTP id d2e1a72fcca58-71926218480mr30676619b3a.28.1726642142062; Tue, 17 Sep 2024 23:49:02 -0700 (PDT) From: Ani Sinha To: Paolo Bonzini , Peter Xu , David Hildenbrand , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Cc: Ani Sinha , qemu-devel@nongnu.org Subject: [PATCH v3] memory: notify hypervisor of all eventfds during listener (de)registration Date: Wed, 18 Sep 2024 12:18:53 +0530 Message-ID: <20240918064853.30678-1-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 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=anisinha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H3=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1726642222113116600 Content-Type: text/plain; charset="utf-8" When a new listener for an address space is registered, the hypervisor must= be informed of all existing eventfds for that address space by calling eventfd_add() for that listener. Similarly, when a listener is de-registered from an address space, the hypervisor must be informed of all existing even= tfds for that address space with a call to eventfd_del(). Same is also true for coalesced io. Send coalesced io add/del listener notifications if any flatrage for the address space registered with the listener intersects with any coalesced io range. Suggested-by: Paolo Bonzini Signed-off-by: Ani Sinha --- system/memory.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) changelog: v2: tags added, indentation fixed, commit log fixed, code cleanup. v3: Peter's suggestions included. diff --git a/system/memory.c b/system/memory.c index f6f6fee6d8..85f6834cb3 100644 --- a/system/memory.c +++ b/system/memory.c @@ -941,6 +941,38 @@ static void flat_range_coalesced_io_add(FlatRange *fr,= AddressSpace *as) } } =20 +static void +flat_range_coalesced_io_notify_listener_add_del(FlatRange *fr, + MemoryRegionSection *mrs, + MemoryListener *listener, + AddressSpace *as, bool add) +{ + CoalescedMemoryRange *cmr; + MemoryRegion *mr =3D fr->mr; + AddrRange tmp; + + QTAILQ_FOREACH(cmr, &mr->coalesced, link) { + tmp =3D addrrange_shift(cmr->addr, + int128_sub(fr->addr.start, + int128_make64(fr->offset_in_regio= n))); + + if (!addrrange_intersects(tmp, fr->addr)) { + return; + } + tmp =3D addrrange_intersection(tmp, fr->addr); + + if (add && listener->coalesced_io_add) { + listener->coalesced_io_add(listener, mrs, + int128_get64(tmp.start), + int128_get64(tmp.size)); + } else if (!add && listener->coalesced_io_del) { + listener->coalesced_io_del(listener, mrs, + int128_get64(tmp.start), + int128_get64(tmp.size)); + } + } +} + static void address_space_update_topology_pass(AddressSpace *as, const FlatView *old_view, const FlatView *new_view, @@ -3015,8 +3047,10 @@ void memory_global_dirty_log_stop(unsigned int flags) static void listener_add_address_space(MemoryListener *listener, AddressSpace *as) { + unsigned i; FlatView *view; FlatRange *fr; + MemoryRegionIoeventfd *fd; =20 if (listener->begin) { listener->begin(listener); @@ -3041,10 +3075,34 @@ static void listener_add_address_space(MemoryListen= er *listener, if (listener->region_add) { listener->region_add(listener, §ion); } + + /* send coalesced io add notifications */ + flat_range_coalesced_io_notify_listener_add_del(fr, §ion, + listener, as, true= ); + if (fr->dirty_log_mask && listener->log_start) { listener->log_start(listener, §ion, 0, fr->dirty_log_mask); } } + + /* + * register all eventfds for this address space for the newly register= ed + * listener. + */ + for (i =3D 0; i < as->ioeventfd_nb; i++) { + fd =3D &as->ioeventfds[i]; + MemoryRegionSection section =3D (MemoryRegionSection) { + .fv =3D view, + .offset_within_address_space =3D int128_get64(fd->addr.start), + .size =3D fd->addr.size, + }; + + if (listener->eventfd_add) { + listener->eventfd_add(listener, §ion, + fd->match_data, fd->data, fd->e); + } + } + if (listener->commit) { listener->commit(listener); } @@ -3054,8 +3112,10 @@ static void listener_add_address_space(MemoryListene= r *listener, static void listener_del_address_space(MemoryListener *listener, AddressSpace *as) { + unsigned i; FlatView *view; FlatRange *fr; + MemoryRegionIoeventfd *fd; =20 if (listener->begin) { listener->begin(listener); @@ -3067,10 +3127,33 @@ static void listener_del_address_space(MemoryListen= er *listener, if (fr->dirty_log_mask && listener->log_stop) { listener->log_stop(listener, §ion, fr->dirty_log_mask, 0); } + + /* send coalesced io del notifications */ + flat_range_coalesced_io_notify_listener_add_del(fr, §ion, + listener, as, fals= e); if (listener->region_del) { listener->region_del(listener, §ion); } } + + /* + * de-register all eventfds for this address space for the current + * listener. + */ + for (i =3D 0; i < as->ioeventfd_nb; i++) { + fd =3D &as->ioeventfds[i]; + MemoryRegionSection section =3D (MemoryRegionSection) { + .fv =3D view, + .offset_within_address_space =3D int128_get64(fd->addr.start), + .size =3D fd->addr.size, + }; + + if (listener->eventfd_del) { + listener->eventfd_del(listener, §ion, + fd->match_data, fd->data, fd->e); + } + } + if (listener->commit) { listener->commit(listener); } --=20 2.42.0