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Tsirkin" To: Cindy Lu Cc: alex.williamson@redhat.com, jasowang@redhat.com, pbonzini@redhat.com, peterx@redhat.com, david@redhat.com, f4bug@amsat.org, sgarzare@redhat.com, qemu-devel@nongnu.org Subject: Re: [PATCH v9 1/2] vfio: move implement of vfio_get_xlat_addr() to memory.c Message-ID: <20221031025344-mutt-send-email-mst@kernel.org> References: <20221031031020.1405111-3-lulu@redhat.com> <20221031031020.1405111-2-lulu@redhat.com> <20221031023754-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -38 X-Spam_score: -3.9 X-Spam_bar: --- X-Spam_report: (-3.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.055, 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_H2=-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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Oct 31, 2022 at 02:44:11PM +0800, Cindy Lu wrote: > On Mon, 31 Oct 2022 at 14:38, Michael S. Tsirkin wrote: > > > > On Mon, Oct 31, 2022 at 11:10:19AM +0800, Cindy Lu wrote: > > > - Move the implement vfio_get_xlat_addr to softmmu/memory.c, and > > > change the name to memory_get_xlat_addr(). So we can use this > > > function on other devices, such as vDPA device. > > > - Add a new function vfio_get_xlat_addr in vfio/common.c, and it will check > > > whether the memory is backed by a discard manager. then device can > > > have its own warning. > > > > > > Signed-off-by: Cindy Lu > > > > Could you rebase on top of my tree (config interrupt support conflicts). > > > Hi Micheal, > sure, will do, but I found a crash in config interrupt while testing > vhost user, > should I post a new version for it? Or maybe a patch later? > Thanks > Cindy New version, I will drop this one. So do you want this one picked up and config interrupt on top? > > > --- > > > hw/vfio/common.c | 66 +++------------------------------------ > > > include/exec/memory.h | 4 +++ > > > softmmu/memory.c | 72 +++++++++++++++++++++++++++++++++++++++++++ > > > 3 files changed, 81 insertions(+), 61 deletions(-) > > > > > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > > > index ace9562a9b..6bc02b32c8 100644 > > > --- a/hw/vfio/common.c > > > +++ b/hw/vfio/common.c > > > @@ -578,45 +578,11 @@ static bool vfio_listener_skipped_section(MemoryRegionSection *section) > > > static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, > > > ram_addr_t *ram_addr, bool *read_only) > > > { > > > - MemoryRegion *mr; > > > - hwaddr xlat; > > > - hwaddr len = iotlb->addr_mask + 1; > > > - bool writable = iotlb->perm & IOMMU_WO; > > > - > > > - /* > > > - * The IOMMU TLB entry we have just covers translation through > > > - * this IOMMU to its immediate target. We need to translate > > > - * it the rest of the way through to memory. > > > - */ > > > - mr = address_space_translate(&address_space_memory, > > > - iotlb->translated_addr, > > > - &xlat, &len, writable, > > > - MEMTXATTRS_UNSPECIFIED); > > > - if (!memory_region_is_ram(mr)) { > > > - error_report("iommu map to non memory area %"HWADDR_PRIx"", > > > - xlat); > > > - return false; > > > - } else if (memory_region_has_ram_discard_manager(mr)) { > > > - RamDiscardManager *rdm = memory_region_get_ram_discard_manager(mr); > > > - MemoryRegionSection tmp = { > > > - .mr = mr, > > > - .offset_within_region = xlat, > > > - .size = int128_make64(len), > > > - }; > > > - > > > - /* > > > - * Malicious VMs can map memory into the IOMMU, which is expected > > > - * to remain discarded. vfio will pin all pages, populating memory. > > > - * Disallow that. vmstate priorities make sure any RamDiscardManager > > > - * were already restored before IOMMUs are restored. > > > - */ > > > - if (!ram_discard_manager_is_populated(rdm, &tmp)) { > > > - error_report("iommu map to discarded memory (e.g., unplugged via" > > > - " virtio-mem): %"HWADDR_PRIx"", > > > - iotlb->translated_addr); > > > - return false; > > > - } > > > + bool ret, mr_has_discard_manager; > > > > > > + ret = memory_get_xlat_addr(iotlb, vaddr, ram_addr, read_only, > > > + &mr_has_discard_manager); > > > + if (ret && mr_has_discard_manager) { > > > /* > > > * Malicious VMs might trigger discarding of IOMMU-mapped memory. The > > > * pages will remain pinned inside vfio until unmapped, resulting in a > > > @@ -635,29 +601,7 @@ static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, > > > " intended via an IOMMU. It's possible to mitigate " > > > " by setting/adjusting RLIMIT_MEMLOCK."); > > > } > > > - > > > - /* > > > - * Translation truncates length to the IOMMU page size, > > > - * check that it did not truncate too much. > > > - */ > > > - if (len & iotlb->addr_mask) { > > > - error_report("iommu has granularity incompatible with target AS"); > > > - return false; > > > - } > > > - > > > - if (vaddr) { > > > - *vaddr = memory_region_get_ram_ptr(mr) + xlat; > > > - } > > > - > > > - if (ram_addr) { > > > - *ram_addr = memory_region_get_ram_addr(mr) + xlat; > > > - } > > > - > > > - if (read_only) { > > > - *read_only = !writable || mr->readonly; > > > - } > > > - > > > - return true; > > > + return ret; > > > } > > > > > > static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) > > > diff --git a/include/exec/memory.h b/include/exec/memory.h > > > index bfb1de8eea..d1e79c39dc 100644 > > > --- a/include/exec/memory.h > > > +++ b/include/exec/memory.h > > > @@ -713,6 +713,10 @@ void ram_discard_manager_register_listener(RamDiscardManager *rdm, > > > void ram_discard_manager_unregister_listener(RamDiscardManager *rdm, > > > RamDiscardListener *rdl); > > > > > > +bool memory_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, > > > + ram_addr_t *ram_addr, bool *read_only, > > > + bool *mr_has_discard_manager); > > > + > > > typedef struct CoalescedMemoryRange CoalescedMemoryRange; > > > typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd; > > > > > > diff --git a/softmmu/memory.c b/softmmu/memory.c > > > index 7ba2048836..bc0be3f62c 100644 > > > --- a/softmmu/memory.c > > > +++ b/softmmu/memory.c > > > @@ -33,6 +33,7 @@ > > > #include "qemu/accel.h" > > > #include "hw/boards.h" > > > #include "migration/vmstate.h" > > > +#include "exec/address-spaces.h" > > > > > > //#define DEBUG_UNASSIGNED > > > > > > @@ -2121,6 +2122,77 @@ void ram_discard_manager_unregister_listener(RamDiscardManager *rdm, > > > rdmc->unregister_listener(rdm, rdl); > > > } > > > > > > +/* Called with rcu_read_lock held. */ > > > +bool memory_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, > > > + ram_addr_t *ram_addr, bool *read_only, > > > + bool *mr_has_discard_manager) > > > +{ > > > + MemoryRegion *mr; > > > + hwaddr xlat; > > > + hwaddr len = iotlb->addr_mask + 1; > > > + bool writable = iotlb->perm & IOMMU_WO; > > > + > > > + if (mr_has_discard_manager) { > > > + *mr_has_discard_manager = false; > > > + } > > > + /* > > > + * The IOMMU TLB entry we have just covers translation through > > > + * this IOMMU to its immediate target. We need to translate > > > + * it the rest of the way through to memory. > > > + */ > > > + mr = address_space_translate(&address_space_memory, iotlb->translated_addr, > > > + &xlat, &len, writable, MEMTXATTRS_UNSPECIFIED); > > > + if (!memory_region_is_ram(mr)) { > > > + error_report("iommu map to non memory area %" HWADDR_PRIx "", xlat); > > > + return false; > > > + } else if (memory_region_has_ram_discard_manager(mr)) { > > > + RamDiscardManager *rdm = memory_region_get_ram_discard_manager(mr); > > > + MemoryRegionSection tmp = { > > > + .mr = mr, > > > + .offset_within_region = xlat, > > > + .size = int128_make64(len), > > > + }; > > > + if (mr_has_discard_manager) { > > > + *mr_has_discard_manager = true; > > > + } > > > + /* > > > + * Malicious VMs can map memory into the IOMMU, which is expected > > > + * to remain discarded. vfio will pin all pages, populating memory. > > > + * Disallow that. vmstate priorities make sure any RamDiscardManager > > > + * were already restored before IOMMUs are restored. > > > + */ > > > + if (!ram_discard_manager_is_populated(rdm, &tmp)) { > > > + error_report("iommu map to discarded memory (e.g., unplugged via" > > > + " virtio-mem): %" HWADDR_PRIx "", > > > + iotlb->translated_addr); > > > + return false; > > > + } > > > + } > > > + > > > + /* > > > + * Translation truncates length to the IOMMU page size, > > > + * check that it did not truncate too much. > > > + */ > > > + if (len & iotlb->addr_mask) { > > > + error_report("iommu has granularity incompatible with target AS"); > > > + return false; > > > + } > > > + > > > + if (vaddr) { > > > + *vaddr = memory_region_get_ram_ptr(mr) + xlat; > > > + } > > > + > > > + if (ram_addr) { > > > + *ram_addr = memory_region_get_ram_addr(mr) + xlat; > > > + } > > > + > > > + if (read_only) { > > > + *read_only = !writable || mr->readonly; > > > + } > > > + > > > + return true; > > > +} > > > + > > > void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client) > > > { > > > uint8_t mask = 1 << client; > > > -- > > > 2.34.3 > > > > On Mon, Oct 31, 2022 at 11:10:20AM +0800, Cindy Lu wrote: > > > Add support for vIOMMU. add the new function to deal with iommu MR. > > > - during iommu_region_add register a specific IOMMU notifier, > > > and store all notifiers in a list. > > > - during iommu_region_del, compare and delete the IOMMU notifier from the list > > > > > > Verified in vp_vdpa and vdpa_sim_net driver > > > > > > Signed-off-by: Cindy Lu > > > --- > > > hw/virtio/vhost-vdpa.c | 123 ++++++++++++++++++++++++++++++--- > > > include/hw/virtio/vhost-vdpa.h | 10 +++ > > > 2 files changed, 122 insertions(+), 11 deletions(-) > > > > > > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c > > > index 3ff9ce3501..dcfaaccfa9 100644 > > > --- a/hw/virtio/vhost-vdpa.c > > > +++ b/hw/virtio/vhost-vdpa.c > > > @@ -26,6 +26,7 @@ > > > #include "cpu.h" > > > #include "trace.h" > > > #include "qapi/error.h" > > > +#include "hw/virtio/virtio-access.h" > > > > > > /* > > > * Return one past the end of the end of section. Be careful with uint64_t > > > @@ -44,7 +45,6 @@ static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section, > > > uint64_t iova_min, > > > uint64_t iova_max) > > > { > > > - Int128 llend; > > > > > > if ((!memory_region_is_ram(section->mr) && > > > !memory_region_is_iommu(section->mr)) || > > > @@ -61,14 +61,6 @@ static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section, > > > return true; > > > } > > > > > > - llend = vhost_vdpa_section_end(section); > > > - if (int128_gt(llend, int128_make64(iova_max))) { > > > - error_report("RAM section out of device range (max=0x%" PRIx64 > > > - ", end addr=0x%" PRIx64 ")", > > > - iova_max, int128_get64(llend)); > > > - return true; > > > - } > > > - > > > return false; > > > } > > > > > > @@ -173,6 +165,106 @@ static void vhost_vdpa_listener_commit(MemoryListener *listener) > > > v->iotlb_batch_begin_sent = false; > > > } > > > > > > +static void vhost_vdpa_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) > > > +{ > > > + struct vdpa_iommu *iommu = container_of(n, struct vdpa_iommu, n); > > > + > > > + hwaddr iova = iotlb->iova + iommu->iommu_offset; > > > + struct vhost_vdpa *v = iommu->dev; > > > + void *vaddr; > > > + int ret; > > > + > > > + if (iotlb->target_as != &address_space_memory) { > > > + error_report("Wrong target AS \"%s\", only system memory is allowed", > > > + iotlb->target_as->name ? iotlb->target_as->name : "none"); > > > + return; > > > + } > > > + RCU_READ_LOCK_GUARD(); > > > + vhost_vdpa_iotlb_batch_begin_once(v); > > > + > > > + if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { > > > + bool read_only; > > > + > > > + if (!memory_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, NULL)) { > > > + return; > > > + } > > > + ret = > > > + vhost_vdpa_dma_map(v, iova, iotlb->addr_mask + 1, vaddr, read_only); > > > + if (ret) { > > > + error_report("vhost_vdpa_dma_map(%p, 0x%" HWADDR_PRIx ", " > > > + "0x%" HWADDR_PRIx ", %p) = %d (%m)", > > > + v, iova, iotlb->addr_mask + 1, vaddr, ret); > > > + } > > > + } else { > > > + ret = vhost_vdpa_dma_unmap(v, iova, iotlb->addr_mask + 1); > > > + if (ret) { > > > + error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", " > > > + "0x%" HWADDR_PRIx ") = %d (%m)", > > > + v, iova, iotlb->addr_mask + 1, ret); > > > + } > > > + } > > > +} > > > + > > > +static void vhost_vdpa_iommu_region_add(MemoryListener *listener, > > > + MemoryRegionSection *section) > > > +{ > > > + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener); > > > + > > > + struct vdpa_iommu *iommu; > > > + Int128 end; > > > + int iommu_idx; > > > + IOMMUMemoryRegion *iommu_mr; > > > + int ret; > > > + > > > + iommu_mr = IOMMU_MEMORY_REGION(section->mr); > > > + > > > + iommu = g_malloc0(sizeof(*iommu)); > > > + end = int128_add(int128_make64(section->offset_within_region), > > > + section->size); > > > + end = int128_sub(end, int128_one()); > > > + iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, > > > + MEMTXATTRS_UNSPECIFIED); > > > + > > > + iommu->iommu_mr = iommu_mr; > > > + > > > + iommu_notifier_init( > > > + &iommu->n, vhost_vdpa_iommu_map_notify, IOMMU_NOTIFIER_IOTLB_EVENTS, > > > + section->offset_within_region, int128_get64(end), iommu_idx); > > > + iommu->iommu_offset = > > > + section->offset_within_address_space - section->offset_within_region; > > > + iommu->dev = v; > > > + > > > + ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL); > > > + if (ret) { > > > + g_free(iommu); > > > + return; > > > + } > > > + > > > + QLIST_INSERT_HEAD(&v->iommu_list, iommu, iommu_next); > > > + memory_region_iommu_replay(iommu->iommu_mr, &iommu->n); > > > + > > > + return; > > > +} > > > + > > > +static void vhost_vdpa_iommu_region_del(MemoryListener *listener, > > > + MemoryRegionSection *section) > > > +{ > > > + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener); > > > + > > > + struct vdpa_iommu *iommu; > > > + > > > + QLIST_FOREACH(iommu, &v->iommu_list, iommu_next) > > > + { > > > + if (MEMORY_REGION(iommu->iommu_mr) == section->mr && > > > + iommu->n.start == section->offset_within_region) { > > > + memory_region_unregister_iommu_notifier(section->mr, &iommu->n); > > > + QLIST_REMOVE(iommu, iommu_next); > > > + g_free(iommu); > > > + break; > > > + } > > > + } > > > +} > > > + > > > static void vhost_vdpa_listener_region_add(MemoryListener *listener, > > > MemoryRegionSection *section) > > > { > > > @@ -186,6 +278,10 @@ static void vhost_vdpa_listener_region_add(MemoryListener *listener, > > > v->iova_range.last)) { > > > return; > > > } > > > + if (memory_region_is_iommu(section->mr)) { > > > + vhost_vdpa_iommu_region_add(listener, section); > > > + return; > > > + } > > > > > > if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != > > > (section->offset_within_region & ~TARGET_PAGE_MASK))) { > > > @@ -260,6 +356,10 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener, > > > v->iova_range.last)) { > > > return; > > > } > > > + if (memory_region_is_iommu(section->mr)) { > > > + vhost_vdpa_iommu_region_del(listener, section); > > > + return; > > > + } > > > > > > if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != > > > (section->offset_within_region & ~TARGET_PAGE_MASK))) { > > > @@ -312,6 +412,7 @@ static const MemoryListener vhost_vdpa_memory_listener = { > > > .region_del = vhost_vdpa_listener_region_del, > > > }; > > > > > > + > > > static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int request, > > > void *arg) > > > { > > > @@ -587,7 +688,6 @@ static int vhost_vdpa_cleanup(struct vhost_dev *dev) > > > v = dev->opaque; > > > trace_vhost_vdpa_cleanup(dev, v); > > > vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); > > > - memory_listener_unregister(&v->listener); > > > vhost_vdpa_svq_cleanup(dev); > > > > > > dev->opaque = NULL; > > > @@ -1127,7 +1227,8 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started) > > > } > > > > > > if (started) { > > > - memory_listener_register(&v->listener, &address_space_memory); > > > + memory_listener_register(&v->listener, dev->vdev->dma_as); > > > + > > > return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); > > > } else { > > > vhost_vdpa_reset_device(dev); > > > diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h > > > index d10a89303e..64a46e37cb 100644 > > > --- a/include/hw/virtio/vhost-vdpa.h > > > +++ b/include/hw/virtio/vhost-vdpa.h > > > @@ -41,8 +41,18 @@ typedef struct vhost_vdpa { > > > void *shadow_vq_ops_opaque; > > > struct vhost_dev *dev; > > > VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX]; > > > + QLIST_HEAD(, vdpa_iommu) iommu_list; > > > + IOMMUNotifier n; > > > } VhostVDPA; > > > > > > +struct vdpa_iommu { > > > + struct vhost_vdpa *dev; > > > + IOMMUMemoryRegion *iommu_mr; > > > + hwaddr iommu_offset; > > > + IOMMUNotifier n; > > > + QLIST_ENTRY(vdpa_iommu) iommu_next; > > > +}; > > > + > > > int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size, > > > void *vaddr, bool readonly); > > > int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, hwaddr size); > > > -- > > > 2.34.3 > >