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Tsirkin" , Jason Wang , Stefan Hajnoczi , Stefano Garzarella , Germano Veit Michel , Raphael Norwitz , Raphael Norwitz Subject: [PATCH v2 05/14] libvhost-user: Factor out adding a memory region Date: Wed, 14 Feb 2024 16:16:52 +0100 Message-ID: <20240214151701.29906-6-david@redhat.com> In-Reply-To: <20240214151701.29906-1-david@redhat.com> References: <20240214151701.29906-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 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: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.531, 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: 1707923887209100011 Content-Type: text/plain; charset="utf-8" Let's factor it out, reducing quite some code duplication and perparing for further changes. If we fail to mmap a region and panic, we now simply don't add that (broken) region. Note that we now increment dev->nregions as we are successfully adding memory regions, and don't increment dev->nregions if anything went wrong. Reviewed-by: Raphael Norwitz Acked-by: Stefano Garzarella Signed-off-by: David Hildenbrand --- subprojects/libvhost-user/libvhost-user.c | 168 ++++++++-------------- 1 file changed, 60 insertions(+), 108 deletions(-) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index a7bd7de3cd..f43b5096d0 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -256,6 +256,61 @@ vu_remove_all_mem_regs(VuDev *dev) dev->nregions =3D 0; } =20 +static void +_vu_add_mem_reg(VuDev *dev, VhostUserMemoryRegion *msg_region, int fd) +{ + int prot =3D PROT_READ | PROT_WRITE; + VuDevRegion *r; + void *mmap_addr; + + DPRINT("Adding region %d\n", dev->nregions); + DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", + msg_region->guest_phys_addr); + DPRINT(" memory_size: 0x%016"PRIx64"\n", + msg_region->memory_size); + DPRINT(" userspace_addr: 0x%016"PRIx64"\n", + msg_region->userspace_addr); + DPRINT(" mmap_offset: 0x%016"PRIx64"\n", + msg_region->mmap_offset); + + if (dev->postcopy_listening) { + /* + * In postcopy we're using PROT_NONE here to catch anyone + * accessing it before we userfault + */ + prot =3D PROT_NONE; + } + + /* + * We don't use offset argument of mmap() since the mapped address has + * to be page aligned, and we use huge pages. + */ + mmap_addr =3D mmap(0, msg_region->memory_size + msg_region->mmap_offse= t, + prot, MAP_SHARED | MAP_NORESERVE, fd, 0); + if (mmap_addr =3D=3D MAP_FAILED) { + vu_panic(dev, "region mmap error: %s", strerror(errno)); + return; + } + DPRINT(" mmap_addr: 0x%016"PRIx64"\n", + (uint64_t)(uintptr_t)mmap_addr); + + r =3D &dev->regions[dev->nregions]; + r->gpa =3D msg_region->guest_phys_addr; + r->size =3D msg_region->memory_size; + r->qva =3D msg_region->userspace_addr; + r->mmap_addr =3D (uint64_t)(uintptr_t)mmap_addr; + r->mmap_offset =3D msg_region->mmap_offset; + dev->nregions++; + + if (dev->postcopy_listening) { + /* + * Return the address to QEMU so that it can translate the ufd + * fault addresses back. + */ + msg_region->userspace_addr =3D r->mmap_addr + r->mmap_offset; + } +} + static void vmsg_close_fds(VhostUserMsg *vmsg) { @@ -727,10 +782,7 @@ generate_faults(VuDev *dev) { static bool vu_add_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { int i; - bool track_ramblocks =3D dev->postcopy_listening; VhostUserMemoryRegion m =3D vmsg->payload.memreg.region, *msg_region = =3D &m; - VuDevRegion *dev_region =3D &dev->regions[dev->nregions]; - void *mmap_addr; =20 if (vmsg->fd_num !=3D 1) { vmsg_close_fds(vmsg); @@ -760,69 +812,20 @@ vu_add_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { * we know all the postcopy client bases have been received, and we * should start generating faults. */ - if (track_ramblocks && + if (dev->postcopy_listening && vmsg->size =3D=3D sizeof(vmsg->payload.u64) && vmsg->payload.u64 =3D=3D 0) { (void)generate_faults(dev); return false; } =20 - DPRINT("Adding region: %u\n", dev->nregions); - DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", - msg_region->guest_phys_addr); - DPRINT(" memory_size: 0x%016"PRIx64"\n", - msg_region->memory_size); - DPRINT(" userspace_addr 0x%016"PRIx64"\n", - msg_region->userspace_addr); - DPRINT(" mmap_offset 0x%016"PRIx64"\n", - msg_region->mmap_offset); - - dev_region->gpa =3D msg_region->guest_phys_addr; - dev_region->size =3D msg_region->memory_size; - dev_region->qva =3D msg_region->userspace_addr; - dev_region->mmap_offset =3D msg_region->mmap_offset; - - /* - * We don't use offset argument of mmap() since the - * mapped address has to be page aligned, and we use huge - * pages. - */ - if (track_ramblocks) { - /* - * In postcopy we're using PROT_NONE here to catch anyone - * accessing it before we userfault. - */ - mmap_addr =3D mmap(0, dev_region->size + dev_region->mmap_offset, - PROT_NONE, MAP_SHARED | MAP_NORESERVE, - vmsg->fds[0], 0); - } else { - mmap_addr =3D mmap(0, dev_region->size + dev_region->mmap_offset, - PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERV= E, - vmsg->fds[0], 0); - } - - if (mmap_addr =3D=3D MAP_FAILED) { - vu_panic(dev, "region mmap error: %s", strerror(errno)); - } else { - dev_region->mmap_addr =3D (uint64_t)(uintptr_t)mmap_addr; - DPRINT(" mmap_addr: 0x%016"PRIx64"\n", - dev_region->mmap_addr); - } - + _vu_add_mem_reg(dev, msg_region, vmsg->fds[0]); close(vmsg->fds[0]); =20 - if (track_ramblocks) { - /* - * Return the address to QEMU so that it can translate the ufd - * fault addresses back. - */ - msg_region->userspace_addr =3D (uintptr_t)(mmap_addr + - dev_region->mmap_offset); - + if (dev->postcopy_listening) { /* Send the message back to qemu with the addresses filled in. */ vmsg->fd_num =3D 0; DPRINT("Successfully added new region in postcopy\n"); - dev->nregions++; return true; } else { for (i =3D 0; i < dev->max_queues; i++) { @@ -835,7 +838,6 @@ vu_add_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { } =20 DPRINT("Successfully added new region\n"); - dev->nregions++; return false; } } @@ -940,63 +942,13 @@ static bool vu_set_mem_table_exec(VuDev *dev, VhostUserMsg *vmsg) { VhostUserMemory m =3D vmsg->payload.memory, *memory =3D &m; - int prot =3D PROT_READ | PROT_WRITE; unsigned int i; =20 - if (dev->postcopy_listening) { - /* - * In postcopy we're using PROT_NONE here to catch anyone - * accessing it before we userfault - */ - prot =3D PROT_NONE; - } - vu_remove_all_mem_regs(dev); - dev->nregions =3D memory->nregions; =20 DPRINT("Nregions: %u\n", memory->nregions); - for (i =3D 0; i < dev->nregions; i++) { - void *mmap_addr; - VhostUserMemoryRegion *msg_region =3D &memory->regions[i]; - VuDevRegion *dev_region =3D &dev->regions[i]; - - DPRINT("Region %d\n", i); - DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", - msg_region->guest_phys_addr); - DPRINT(" memory_size: 0x%016"PRIx64"\n", - msg_region->memory_size); - DPRINT(" userspace_addr 0x%016"PRIx64"\n", - msg_region->userspace_addr); - DPRINT(" mmap_offset 0x%016"PRIx64"\n", - msg_region->mmap_offset); - - dev_region->gpa =3D msg_region->guest_phys_addr; - dev_region->size =3D msg_region->memory_size; - dev_region->qva =3D msg_region->userspace_addr; - dev_region->mmap_offset =3D msg_region->mmap_offset; - - /* We don't use offset argument of mmap() since the - * mapped address has to be page aligned, and we use huge - * pages. */ - mmap_addr =3D mmap(0, dev_region->size + dev_region->mmap_offset, - prot, MAP_SHARED | MAP_NORESERVE, vmsg->fds[i], 0= ); - - if (mmap_addr =3D=3D MAP_FAILED) { - vu_panic(dev, "region mmap error: %s", strerror(errno)); - } else { - dev_region->mmap_addr =3D (uint64_t)(uintptr_t)mmap_addr; - DPRINT(" mmap_addr: 0x%016"PRIx64"\n", - dev_region->mmap_addr); - } - - if (dev->postcopy_listening) { - /* - * Return the address to QEMU so that it can translate the ufd - * fault addresses back. - */ - msg_region->userspace_addr =3D (uintptr_t)(mmap_addr + - dev_region->mmap_offs= et); - } + for (i =3D 0; i < memory->nregions; i++) { + _vu_add_mem_reg(dev, &memory->regions[i], vmsg->fds[i]); close(vmsg->fds[i]); } =20 --=20 2.43.0