vfio queue:

* Fixes on VFIO display
 * VIRTIO-IOMMU/HostIOMMUDevice: Fixes and page size mask rework
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Merge tag 'pull-vfio-20240709' of https://github.com/legoater/qemu into staging

vfio queue:

* Fixes on VFIO display
* VIRTIO-IOMMU/HostIOMMUDevice: Fixes and page size mask rework

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# Primary key fingerprint: A0F6 6548 F048 95EB FE6B  0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20240709' of https://github.com/legoater/qemu:
  vfio/display: Fix vfio_display_edid_init() error path
  vfio/display: Fix potential memleak of edid info
  virtio-iommu: Revert transient enablement of IOMMU MR in bypass mode
  memory: remove IOMMU MR iommu_set_page_size_mask() callback
  virtio-iommu : Retrieve page size mask on virtio_iommu_set_iommu_device()
  HostIOMMUDevice: Introduce get_page_size_mask() callback
  HostIOMMUDevice : remove Error handle from get_iova_ranges callback
  vfio-container-base: Introduce vfio_container_get_iova_ranges() helper
  virtio-iommu: Fix error handling in virtio_iommu_set_host_iova_ranges()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

hw/vfio/common.c

@@ -622,14 +622,6 @@ static void vfio_listener_region_add(MemoryListener *listener,
                             int128_get64(llend),
                             iommu_idx);
 
-        ret = memory_region_iommu_set_page_size_mask(giommu->iommu_mr,
-                                                     bcontainer->pgsizes,
-                                                     &err);
-        if (ret) {
-            g_free(giommu);
-            goto fail;
-        }
-
         ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
                                                     &err);
         if (ret) {

hw/vfio/container-base.c

@@ -83,6 +83,21 @@ int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                                errp);
 }
 
+static gpointer copy_iova_range(gconstpointer src, gpointer data)
+{
+     Range *source = (Range *)src;
+     Range *dest = g_new(Range, 1);
+
+     range_set_bounds(dest, range_lob(source), range_upb(source));
+     return dest;
+}
+
+GList *vfio_container_get_iova_ranges(const VFIOContainerBase *bcontainer)
+{
+    assert(bcontainer);
+    return g_list_copy_deep(bcontainer->iova_ranges, copy_iova_range, NULL);
+}
+
 static void vfio_container_instance_finalize(Object *obj)
 {
     VFIOContainerBase *bcontainer = VFIO_IOMMU(obj);

hw/vfio/container.c

@@ -1165,18 +1165,21 @@ static int hiod_legacy_vfio_get_cap(HostIOMMUDevice *hiod, int cap,
 }
 
 static GList *
-hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
+hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod)
 {
     VFIODevice *vdev = hiod->agent;
-    GList *l = NULL;
 
     g_assert(vdev);
+    return vfio_container_get_iova_ranges(vdev->bcontainer);
+}
 
-    if (vdev->bcontainer) {
+static uint64_t
-        l = g_list_copy(vdev->bcontainer->iova_ranges);
+hiod_legacy_vfio_get_page_size_mask(HostIOMMUDevice *hiod)
-    }
+{
+    VFIODevice *vdev = hiod->agent;
 
-    return l;
+    g_assert(vdev);
+    return vfio_container_get_page_size_mask(vdev->bcontainer);
 }
 
 static void vfio_iommu_legacy_instance_init(Object *obj)
@@ -1193,6 +1196,7 @@ static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
     hioc->realize = hiod_legacy_vfio_realize;
     hioc->get_cap = hiod_legacy_vfio_get_cap;
     hioc->get_iova_ranges = hiod_legacy_vfio_get_iova_ranges;
+    hioc->get_page_size_mask = hiod_legacy_vfio_get_page_size_mask;
 };
 
 static const TypeInfo types[] = {

hw/vfio/display.c

@@ -124,7 +124,7 @@ static void vfio_display_edid_ui_info(void *opaque, uint32_t idx,
     }
 }
 
-static void vfio_display_edid_init(VFIOPCIDevice *vdev)
+static bool vfio_display_edid_init(VFIOPCIDevice *vdev, Error **errp)
 {
     VFIODisplay *dpy = vdev->dpy;
     int fd = vdev->vbasedev.fd;
@@ -135,7 +135,8 @@ static void vfio_display_edid_init(VFIOPCIDevice *vdev)
                                    VFIO_REGION_SUBTYPE_GFX_EDID,
                                    &dpy->edid_info);
     if (ret) {
-        return;
+        /* Failed to get GFX edid info, allow to go through without edid. */
+        return true;
     }
 
     trace_vfio_display_edid_available();
@@ -167,13 +168,16 @@ static void vfio_display_edid_init(VFIOPCIDevice *vdev)
                                         vfio_display_edid_link_up, vdev);
 
     vfio_display_edid_update(vdev, true, 0, 0);
-    return;
+    return true;
 
 err:
+    error_setg(errp, "vfio: failed to read GFX edid field");
     trace_vfio_display_edid_write_error();
+    g_free(dpy->edid_info);
     g_free(dpy->edid_regs);
+    dpy->edid_info = NULL;
     dpy->edid_regs = NULL;
-    return;
+    return false;
 }
 
 static void vfio_display_edid_exit(VFIODisplay *dpy)
@@ -182,6 +186,7 @@ static void vfio_display_edid_exit(VFIODisplay *dpy)
         return;
     }
 
+    g_free(dpy->edid_info);
     g_free(dpy->edid_regs);
     g_free(dpy->edid_blob);
     timer_free(dpy->edid_link_timer);
@@ -365,8 +370,7 @@ static bool vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
             return false;
         }
     }
-    vfio_display_edid_init(vdev);
+    return vfio_display_edid_init(vdev, errp);
-    return true;
 }
 
 static void vfio_display_dmabuf_exit(VFIODisplay *dpy)

hw/vfio/iommufd.c

@@ -644,26 +644,31 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
 }
 
 static GList *
-hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
+hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice *hiod)
 {
     VFIODevice *vdev = hiod->agent;
-    GList *l = NULL;
 
     g_assert(vdev);
-
+    return vfio_container_get_iova_ranges(vdev->bcontainer);
-    if (vdev->bcontainer) {
-        l = g_list_copy(vdev->bcontainer->iova_ranges);
-    }
-
-    return l;
 }
 
+static uint64_t
+hiod_iommufd_vfio_get_page_size_mask(HostIOMMUDevice *hiod)
+{
+    VFIODevice *vdev = hiod->agent;
+
+    g_assert(vdev);
+    return vfio_container_get_page_size_mask(vdev->bcontainer);
+}
+
+
 static void hiod_iommufd_vfio_class_init(ObjectClass *oc, void *data)
 {
     HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
 
     hiodc->realize = hiod_iommufd_vfio_realize;
     hiodc->get_iova_ranges = hiod_iommufd_vfio_get_iova_ranges;
+    hiodc->get_page_size_mask = hiod_iommufd_vfio_get_page_size_mask;
 };
 
 static const TypeInfo types[] = {

hw/virtio/trace-events

@@ -131,7 +131,7 @@ virtio_iommu_fill_resv_property(uint32_t devid, uint8_t subtype, uint64_t start,
 virtio_iommu_notify_map(const char *name, uint64_t virt_start, uint64_t virt_end, uint64_t phys_start, uint32_t flags) "mr=%s virt_start=0x%"PRIx64" virt_end=0x%"PRIx64" phys_start=0x%"PRIx64" flags=%d"
 virtio_iommu_notify_unmap(const char *name, uint64_t virt_start, uint64_t virt_end) "mr=%s virt_start=0x%"PRIx64" virt_end=0x%"PRIx64
 virtio_iommu_remap(const char *name, uint64_t virt_start, uint64_t virt_end, uint64_t phys_start) "mr=%s virt_start=0x%"PRIx64" virt_end=0x%"PRIx64" phys_start=0x%"PRIx64
-virtio_iommu_set_page_size_mask(const char *name, uint64_t old, uint64_t new) "mr=%s old_mask=0x%"PRIx64" new_mask=0x%"PRIx64
+virtio_iommu_update_page_size_mask(const char *name, uint64_t old, uint64_t new) "host iommu device=%s old_mask=0x%"PRIx64" new_mask=0x%"PRIx64
 virtio_iommu_notify_flag_add(const char *name) "add notifier to mr %s"
 virtio_iommu_notify_flag_del(const char *name) "del notifier from mr %s"
 virtio_iommu_switch_address_space(uint8_t bus, uint8_t slot, uint8_t fn, bool on) "Device %02x:%02x.%x switching address space (iommu enabled=%d)"

hw/virtio/virtio-iommu.c

@@ -563,10 +563,15 @@ static int virtio_iommu_set_host_iova_ranges(VirtIOIOMMU *s, PCIBus *bus,
     int ret = -EINVAL;
 
     if (!sbus) {
-        error_report("%s no sbus", __func__);
+        error_setg(errp, "%s: no IOMMUPciBus found!", __func__);
+        return ret;
     }
 
     sdev = sbus->pbdev[devfn];
+    if (!sdev) {
+        error_setg(errp, "%s: no IOMMUDevice found!", __func__);
+        return ret;
+    }
 
     current_ranges = sdev->host_resv_ranges;
 
@@ -613,9 +618,39 @@ out:
     return ret;
 }
 
+static bool check_page_size_mask(VirtIOIOMMU *viommu, uint64_t new_mask,
+                                 Error **errp)
+{
+    uint64_t cur_mask = viommu->config.page_size_mask;
+
+    if ((cur_mask & new_mask) == 0) {
+        error_setg(errp, "virtio-iommu reports a page size mask 0x%"PRIx64
+                   " incompatible with currently supported mask 0x%"PRIx64,
+                   new_mask, cur_mask);
+        return false;
+    }
+    /*
+     * Once the granule is frozen we can't change the mask anymore. If by
+     * chance the hotplugged device supports the same granule, we can still
+     * accept it.
+     */
+    if (viommu->granule_frozen) {
+        int cur_granule = ctz64(cur_mask);
+
+        if (!(BIT_ULL(cur_granule) & new_mask)) {
+            error_setg(errp,
+                       "virtio-iommu does not support frozen granule 0x%llx",
+                       BIT_ULL(cur_granule));
+            return false;
+        }
+    }
+    return true;
+}
+
 static bool virtio_iommu_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
                                           HostIOMMUDevice *hiod, Error **errp)
 {
+    ERRP_GUARD();
     VirtIOIOMMU *viommu = opaque;
     HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_GET_CLASS(hiod);
     struct hiod_key *new_key;
@@ -630,7 +665,7 @@ static bool virtio_iommu_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
 
     if (hiodc->get_iova_ranges) {
         int ret;
-        host_iova_ranges = hiodc->get_iova_ranges(hiod, errp);
+        host_iova_ranges = hiodc->get_iova_ranges(hiod);
         if (!host_iova_ranges) {
             return true; /* some old kernels may not support that capability */
         }
@@ -638,8 +673,28 @@ static bool virtio_iommu_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
                                                 hiod->aliased_devfn,
                                                 host_iova_ranges, errp);
         if (ret) {
-            g_list_free_full(host_iova_ranges, g_free);
+            goto error;
-            return false;
+        }
+    }
+    if (hiodc->get_page_size_mask) {
+        uint64_t new_mask = hiodc->get_page_size_mask(hiod);
+
+        if (check_page_size_mask(viommu, new_mask, errp)) {
+            /*
+             * The default mask depends on the "granule" property. For example,
+             * with 4k granule, it is -(4 * KiB). When an assigned device has
+             * page size restrictions due to the hardware IOMMU configuration,
+             * apply this restriction to the mask.
+             */
+            trace_virtio_iommu_update_page_size_mask(hiod->name,
+                                                     viommu->config.page_size_mask,
+                                                     new_mask);
+            if (!viommu->granule_frozen) {
+                viommu->config.page_size_mask &= new_mask;
+            }
+        } else {
+            error_prepend(errp, "%s: ", hiod->name);
+            goto error;
         }
     }
 
@@ -652,6 +707,9 @@ static bool virtio_iommu_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
     g_list_free_full(host_iova_ranges, g_free);
 
     return true;
+error:
+    g_list_free_full(host_iova_ranges, g_free);
+    return false;
 }
 
 static void
@@ -1350,50 +1408,6 @@ static int virtio_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu_mr,
     return 0;
 }
 
-/*
- * The default mask depends on the "granule" property. For example, with
- * 4k granule, it is -(4 * KiB). When an assigned device has page size
- * restrictions due to the hardware IOMMU configuration, apply this restriction
- * to the mask.
- */
-static int virtio_iommu_set_page_size_mask(IOMMUMemoryRegion *mr,
-                                           uint64_t new_mask,
-                                           Error **errp)
-{
-    IOMMUDevice *sdev = container_of(mr, IOMMUDevice, iommu_mr);
-    VirtIOIOMMU *s = sdev->viommu;
-    uint64_t cur_mask = s->config.page_size_mask;
-
-    trace_virtio_iommu_set_page_size_mask(mr->parent_obj.name, cur_mask,
-                                          new_mask);
-
-    if ((cur_mask & new_mask) == 0) {
-        error_setg(errp, "virtio-iommu %s reports a page size mask 0x%"PRIx64
-                   " incompatible with currently supported mask 0x%"PRIx64,
-                   mr->parent_obj.name, new_mask, cur_mask);
-        return -1;
-    }
-
-    /*
-     * Once the granule is frozen we can't change the mask anymore. If by
-     * chance the hotplugged device supports the same granule, we can still
-     * accept it.
-     */
-    if (s->granule_frozen) {
-        int cur_granule = ctz64(cur_mask);
-
-        if (!(BIT_ULL(cur_granule) & new_mask)) {
-            error_setg(errp, "virtio-iommu %s does not support frozen granule 0x%llx",
-                       mr->parent_obj.name, BIT_ULL(cur_granule));
-            return -1;
-        }
-        return 0;
-    }
-
-    s->config.page_size_mask &= new_mask;
-    return 0;
-}
-
 static void virtio_iommu_system_reset(void *opaque)
 {
     VirtIOIOMMU *s = opaque;
@@ -1416,18 +1430,6 @@ static void virtio_iommu_freeze_granule(Notifier *notifier, void *data)
     VirtIOIOMMU *s = container_of(notifier, VirtIOIOMMU, machine_done);
     int granule;
 
-    if (likely(s->config.bypass)) {
-        /*
-         * Transient IOMMU MR enable to collect page_size_mask requirements
-         * through memory_region_iommu_set_page_size_mask() called by
-         * VFIO region_add() callback
-         */
-         s->config.bypass = false;
-         virtio_iommu_switch_address_space_all(s);
-         /* restore default */
-         s->config.bypass = true;
-         virtio_iommu_switch_address_space_all(s);
-    }
     s->granule_frozen = true;
     granule = ctz64(s->config.page_size_mask);
     trace_virtio_iommu_freeze_granule(BIT_ULL(granule));
@@ -1718,7 +1720,6 @@ static void virtio_iommu_memory_region_class_init(ObjectClass *klass,
     imrc->translate = virtio_iommu_translate;
     imrc->replay = virtio_iommu_replay;
     imrc->notify_flag_changed = virtio_iommu_notify_flag_changed;
-    imrc->iommu_set_page_size_mask = virtio_iommu_set_page_size_mask;
 }
 
 static const TypeInfo virtio_iommu_info = {

include/exec/memory.h

@@ -504,32 +504,6 @@ struct IOMMUMemoryRegionClass {
      * @iommu: the IOMMUMemoryRegion
      */
     int (*num_indexes)(IOMMUMemoryRegion *iommu);
-
-    /**
-     * @iommu_set_page_size_mask:
-     *
-     * Restrict the page size mask that can be supported with a given IOMMU
-     * memory region. Used for example to propagate host physical IOMMU page
-     * size mask limitations to the virtual IOMMU.
-     *
-     * Optional method: if this method is not provided, then the default global
-     * page mask is used.
-     *
-     * @iommu: the IOMMUMemoryRegion
-     *
-     * @page_size_mask: a bitmask of supported page sizes. At least one bit,
-     * representing the smallest page size, must be set. Additional set bits
-     * represent supported block sizes. For example a host physical IOMMU that
-     * uses page tables with a page size of 4kB, and supports 2MB and 4GB
-     * blocks, will set mask 0x40201000. A granule of 4kB with indiscriminate
-     * block sizes is specified with mask 0xfffffffffffff000.
-     *
-     * Returns 0 on success, or a negative error. In case of failure, the error
-     * object must be created.
-     */
-     int (*iommu_set_page_size_mask)(IOMMUMemoryRegion *iommu,
-                                     uint64_t page_size_mask,
-                                     Error **errp);
 };
 
 typedef struct RamDiscardListener RamDiscardListener;
@@ -1919,18 +1893,6 @@ int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion *iommu_mr,
  */
 int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
 
-/**
- * memory_region_iommu_set_page_size_mask: set the supported page
- * sizes for a given IOMMU memory region
- *
- * @iommu_mr: IOMMU memory region
- * @page_size_mask: supported page size mask
- * @errp: pointer to Error*, to store an error if it happens.
- */
-int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
-                                           uint64_t page_size_mask,
-                                           Error **errp);
-
 /**
  * memory_region_name: get a memory region's name
  *

include/hw/vfio/vfio-container-base.h

@@ -86,6 +86,15 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
 int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                    VFIOBitmap *vbmap, hwaddr iova, hwaddr size, Error **errp);
 
+GList *vfio_container_get_iova_ranges(const VFIOContainerBase *bcontainer);
+
+static inline uint64_t
+vfio_container_get_page_size_mask(const VFIOContainerBase *bcontainer)
+{
+    assert(bcontainer);
+    return bcontainer->pgsizes;
+}
+
 #define TYPE_VFIO_IOMMU "vfio-iommu"
 #define TYPE_VFIO_IOMMU_LEGACY TYPE_VFIO_IOMMU "-legacy"
 #define TYPE_VFIO_IOMMU_SPAPR TYPE_VFIO_IOMMU "-spapr"

include/sysemu/host_iommu_device.h

@@ -87,9 +87,16 @@ struct HostIOMMUDeviceClass {
      * @hiod Host IOMMU device
      *
      * @hiod: handle to the host IOMMU device
-     * @errp: error handle
      */
-    GList* (*get_iova_ranges)(HostIOMMUDevice *hiod, Error **errp);
+    GList* (*get_iova_ranges)(HostIOMMUDevice *hiod);
+    /**
+     *
+     * @get_page_size_mask: Return the page size mask supported along this
+     * @hiod Host IOMMU device
+     *
+     * @hiod: handle to the host IOMMU device
+     */
+    uint64_t (*get_page_size_mask)(HostIOMMUDevice *hiod);
 };
 
 /*

system/memory.c

@@ -1901,19 +1901,6 @@ static int memory_region_update_iommu_notify_flags(IOMMUMemoryRegion *iommu_mr,
     return ret;
 }
 
-int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
-                                           uint64_t page_size_mask,
-                                           Error **errp)
-{
-    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
-    int ret = 0;
-
-    if (imrc->iommu_set_page_size_mask) {
-        ret = imrc->iommu_set_page_size_mask(iommu_mr, page_size_mask, errp);
-    }
-    return ret;
-}
-
 int memory_region_register_iommu_notifier(MemoryRegion *mr,
                                           IOMMUNotifier *n, Error **errp)
 {