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Tsirkin" , Jason Wang , Stefan Hajnoczi , Stefano Garzarella , Germano Veit Michel , Raphael Norwitz Subject: [PATCH v1 08/15] libvhost-user: Don't zero out memory for memory regions Date: Fri, 2 Feb 2024 22:53:25 +0100 Message-ID: <20240202215332.118728-9-david@redhat.com> In-Reply-To: <20240202215332.118728-1-david@redhat.com> References: <20240202215332.118728-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 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=170.10.129.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.276, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1706910936150100003 Content-Type: text/plain; charset="utf-8" dev->nregions always covers only valid entries. Stop zeroing out other array elements that are unused. Signed-off-by: David Hildenbrand Reviewed-by: Raphael Norwitz --- subprojects/libvhost-user/libvhost-user.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index f99c888b48..e1a1b9df88 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -888,13 +888,9 @@ vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { =20 munmap((void *)(uintptr_t)r->mmap_addr, r->size + r->mmap_offs= et); =20 - /* - * Shift all affected entries by 1 to close the hole at index = i and - * zero out the last entry. - */ + /* Shift all affected entries by 1 to close the hole at index.= */ memmove(dev->regions + i, dev->regions + i + 1, sizeof(VuDevRegion) * (dev->nregions - i - 1)); - memset(dev->regions + dev->nregions - 1, 0, sizeof(VuDevRegion= )); DPRINT("Successfully removed a region\n"); dev->nregions--; i--; @@ -2119,7 +2115,6 @@ vu_init(VuDev *dev, DPRINT("%s: failed to malloc mem regions\n", __func__); return false; } - memset(dev->regions, 0, VHOST_USER_MAX_RAM_SLOTS * sizeof(dev->regions= [0])); =20 dev->vq =3D malloc(max_queues * sizeof(dev->vq[0])); if (!dev->vq) { --=20 2.43.0