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Re: [PATCH v5 2/2] dma-buf: heaps: system: add system_cc_shared heap for explicitly shared memory

by T.J. Mercier

On Wed, Mar 25, 2026 at 12:23 PM Jiri Pirko <jiri(a)resnulli.us> wrote: > > From: Jiri Pirko <jiri(a)nvidia.com> > > Add a new "system_cc_shared" dma-buf heap to allow userspace to > allocate shared (decrypted) memory for confidential computing (CoCo) > VMs. > > On CoCo VMs, guest memory is private by default. The hardware uses an > encryption bit in page table entries (C-bit on AMD SEV, "shared" bit on > Intel TDX) to control whether a given memory access is private or > shared. The kernel's direct map is set up as private, > so pages returned by alloc_pages() are private in the direct map > by default. To make this memory usable for devices that do not support > DMA to private memory (no TDISP support), it has to be explicitly > shared. A couple of things are needed to properly handle > shared memory for the dma-buf use case: > > - set_memory_decrypted() on the direct map after allocation: > Besides clearing the encryption bit in the direct map PTEs, this > also notifies the hypervisor about the page state change. On free, > the inverse set_memory_encrypted() must be called before returning > pages to the allocator. If re-encryption fails, pages > are intentionally leaked to prevent shared memory from being > reused as private. > > - pgprot_decrypted() for userspace and kernel virtual mappings: > Any new mapping of the shared pages, be it to userspace via > mmap or to kernel vmalloc space via vmap, creates PTEs independent > of the direct map. These must also have the encryption bit cleared, > otherwise accesses through them would see encrypted (garbage) data. > > - DMA_ATTR_CC_SHARED for DMA mapping: > Since the pages are already shared, the DMA API needs to be > informed via DMA_ATTR_CC_SHARED so it can map them correctly > as unencrypted for device access. > > On non-CoCo VMs, the system_cc_shared heap is not registered > to prevent misuse by userspace that does not understand > the security implications of explicitly shared memory. > > Signed-off-by: Jiri Pirko <jiri(a)nvidia.com> Reviewed-by: T.J. Mercier <tjmercier(a)google.com>

1 week, 4 days

Re: (subset) [PATCH v9 0/7] Rust bindings for gem shmem

by Miguel Ojeda

On Thu, Mar 26, 2026 at 2:15 AM Danilo Krummrich <dakr(a)kernel.org> wrote: > > @Lyude, Alice, Miguel: Please have a look at what I came up with below. Sounds fine to me, thanks! - Regarding the enabled unstable feature: looks good -- it will go away this cycle anyway, so we may get a conflict, but that is fine. - Regarding the `&raw`, that sounds also good. I see you did it similarly to how I did it for `bitmap.rs` -- thanks! (And for future reference, the `bitmap.rs` one was 1.92 instead of 1.82 because that one was for unions, while this one is https://blog.rust-lang.org/2024/10/17/Rust-1.82.0/#safely-addressing-unsafe…). - Regarding the `expect(unused)` -- using `cfg_attr` is fine since it is a simple case, but if it becomes a big issue, then of course please feel free to use `allow` (you already know this, but in case it helps others: I wrote some considerations about this at https://docs.kernel.org/rust/coding-guidelines.html#lints). Cheers, Miguel

1 week, 5 days

[PATCH v3 0/8] dma-buf: heaps: Turn heaps into modules

by Maxime Ripard

Hi, The recent introduction of heaps in the optee driver [1] made possible the creation of heaps as modules. It's generally a good idea if possible, including for the already existing system and CMA heaps. The system one is pretty trivial, the CMA one is a bit more involved, especially since we have a call from kernel/dma/contiguous.c to the CMA heap code. This was solved by turning the logic around and making the CMA heap call into the contiguous DMA code. Let me know what you think, Maxime 1: https://lore.kernel.org/dri-devel/20250911135007.1275833-4-jens.wiklander@l… Signed-off-by: Maxime Ripard <mripard(a)kernel.org> --- Changes in v3: - Squashed cma_get_name and cma_alloc/release patches - Fixed typo in Export dev_get_cma_area commit title - Fixed compilation failure with DMA_CMA but not OF_RESERVED_MEM - Link to v2: https://lore.kernel.org/r/20260227-dma-buf-heaps-as-modules-v2-0-454aee7e06… Changes in v2: - Collect tags - Don't export dma_contiguous_default_area anymore, but export dev_get_cma_area instead - Mentioned that heap modules can't be removed - Link to v1: https://lore.kernel.org/r/20260225-dma-buf-heaps-as-modules-v1-0-2109225a09… --- Maxime Ripard (8): dma: contiguous: Turn heap registration logic around dma: contiguous: Make dev_get_cma_area() a proper function dma: contiguous: Make dma_contiguous_default_area static dma: contiguous: Export dev_get_cma_area() mm: cma: Export cma_alloc(), cma_release() and cma_get_name() dma-buf: heaps: Export mem_accounting parameter dma-buf: heaps: cma: Turn the heap into a module dma-buf: heaps: system: Turn the heap into a module drivers/dma-buf/dma-heap.c | 1 + drivers/dma-buf/heaps/Kconfig | 4 ++-- drivers/dma-buf/heaps/cma_heap.c | 21 +++++---------------- drivers/dma-buf/heaps/system_heap.c | 5 +++++ include/linux/dma-map-ops.h | 18 ++++++++++-------- kernel/dma/contiguous.c | 37 ++++++++++++++++++++++++++++++++++--- mm/cma.c | 3 +++ 7 files changed, 60 insertions(+), 29 deletions(-) --- base-commit: 499a718536dc0e1c1d1b6211847207d58acd9916 change-id: 20260225-dma-buf-heaps-as-modules-1034b3ec9f2a Best regards, -- Maxime Ripard <mripard(a)kernel.org>

1 week, 5 days

Re: [PATCH v4 00/12] drm/amdgpu: use all SDMA instances for TTM clears and moves

by Christian König

Finally coming back to this patch set here. Fell free to add Reviewed-by: Christian König <christian.koenig(a)amd.com> to the first two patches as well and then please start pushing the patches to amd-staging-drm-next. I probably need to go over the last patches once more, but I think it would be better to have the first few upstream first. Regards, Christian. On 2/3/26 11:22, Pierre-Eric Pelloux-Prayer wrote: > The drm/ttm patch modifies TTM to support multiple contexts for the pipelined moves. > > Then amdgpu/ttm is updated to express dependencies between jobs explicitely, > instead of relying on the ordering of execution guaranteed by the use of a single > instance. > With all of this in place, we can use multiple entities, with each having access > to the available SDMA instances. > > This rework also gives the opportunity to merge the clear functions into a single > one and to optimize a bit GART usage. > > Since v3 some patches have been already reviewed and merged separately: > - https://lists.freedesktop.org/archives/amd-gfx/2026-January/137747.html > - https://gitlab.freedesktop.org/drm/kernel/-/commit/ddf055b80a544d6f36f77be5… > This version depend on them. > > v3: https://lists.freedesktop.org/archives/dri-devel/2025-November/537830.html > > Pierre-Eric Pelloux-Prayer (12): > drm/amdgpu: allocate clear entities dynamically > drm/amdgpu: allocate move entities dynamically > drm/amdgpu: round robin through clear_entities in amdgpu_fill_buffer > drm/amdgpu: use TTM_NUM_MOVE_FENCES when reserving fences > drm/amdgpu: use multiple entities in amdgpu_move_blit > drm/amdgpu: pass all the sdma scheds to amdgpu_mman > drm/amdgpu: only use working sdma schedulers for ttm > drm/amdgpu: create multiple clear/move ttm entities > drm/amdgpu: give ttm entities access to all the sdma scheds > drm/amdgpu: get rid of amdgpu_ttm_clear_buffer > drm/amdgpu: rename amdgpu_fill_buffer as amdgpu_ttm_clear_buffer > drm/amdgpu: split amdgpu_ttm_set_buffer_funcs_status in 2 funcs > > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + > drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 16 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 4 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 17 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 329 ++++++++++-------- > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 29 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 6 +- > drivers/gpu/drm/amd/amdgpu/cik_sdma.c | 13 +- > drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c | 8 +- > drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 8 +- > drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 15 +- > drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c | 12 +- > drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c | 11 +- > drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 14 +- > drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c | 5 +- > drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c | 5 +- > drivers/gpu/drm/amd/amdgpu/sdma_v7_1.c | 12 +- > drivers/gpu/drm/amd/amdgpu/si_dma.c | 12 +- > drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 5 +- > drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 +- > .../amd/display/amdgpu_dm/amdgpu_dm_plane.c | 6 +- > .../drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c | 6 +- > 23 files changed, 300 insertions(+), 243 deletions(-) >

1 week, 6 days

[PATCH] dma-buf/dma_fence_array: remove unused functionality

by Christian König

Amdgpu was the only user of the signal on any feature and we dropped that use case recently, so we can remove that functionality again. This allows to simplfy the dma_fence_array code a lot and saves us from the need to install a callback on all fences at the same time. Signed-off-by: Christian König <christian.koenig(a)amd.com> --- drivers/dma-buf/dma-fence-array.c | 133 +++++++----------- drivers/dma-buf/dma-fence-unwrap.c | 3 +- drivers/dma-buf/dma-resv.c | 3 +- drivers/dma-buf/st-dma-fence-unwrap.c | 2 +- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 +- drivers/gpu/drm/xe/xe_sync.c | 2 +- drivers/gpu/drm/xe/xe_vm.c | 4 +- include/linux/dma-fence-array.h | 28 +--- 8 files changed, 63 insertions(+), 115 deletions(-) diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c index 089f69469524..0d54bf2e47ba 100644 --- a/drivers/dma-buf/dma-fence-array.c +++ b/drivers/dma-buf/dma-fence-array.c @@ -42,97 +42,71 @@ static void dma_fence_array_clear_pending_error(struct dma_fence_array *array) cmpxchg(&array->base.error, PENDING_ERROR, 0); } -static void irq_dma_fence_array_work(struct irq_work *wrk) +static void dma_fence_array_cb_func(struct dma_fence *f, + struct dma_fence_cb *cb) { - struct dma_fence_array *array = container_of(wrk, typeof(*array), work); + struct dma_fence_array *array = + container_of(cb, struct dma_fence_array, callback); - dma_fence_array_clear_pending_error(array); - - dma_fence_signal(&array->base); - dma_fence_put(&array->base); + irq_work_queue(&array->work); } -static void dma_fence_array_cb_func(struct dma_fence *f, - struct dma_fence_cb *cb) +static void irq_dma_fence_array_work(struct irq_work *wrk) { - struct dma_fence_array_cb *array_cb = - container_of(cb, struct dma_fence_array_cb, cb); - struct dma_fence_array *array = array_cb->array; + struct dma_fence_array *array = container_of(wrk, typeof(*array), work); - dma_fence_array_set_pending_error(array, f->error); + while (array->num_pending--) { + struct dma_fence *f = array->fences[array->num_pending]; - if (atomic_dec_and_test(&array->num_pending)) - irq_work_queue(&array->work); - else - dma_fence_put(&array->base); + if (!dma_fence_add_callback(f, &array->callback, + dma_fence_array_cb_func)) + return; + + dma_fence_array_set_pending_error(array, f->error); + } + + dma_fence_signal(&array->base); + dma_fence_put(&array->base); } static bool dma_fence_array_enable_signaling(struct dma_fence *fence) { struct dma_fence_array *array = to_dma_fence_array(fence); - struct dma_fence_array_cb *cb = array->callbacks; - unsigned i; - - for (i = 0; i < array->num_fences; ++i) { - cb[i].array = array; - /* - * As we may report that the fence is signaled before all - * callbacks are complete, we need to take an additional - * reference count on the array so that we do not free it too - * early. The core fence handling will only hold the reference - * until we signal the array as complete (but that is now - * insufficient). - */ - dma_fence_get(&array->base); - if (dma_fence_add_callback(array->fences[i], &cb[i].cb, - dma_fence_array_cb_func)) { - int error = array->fences[i]->error; - - dma_fence_array_set_pending_error(array, error); - dma_fence_put(&array->base); - if (atomic_dec_and_test(&array->num_pending)) { - dma_fence_array_clear_pending_error(array); - return false; - } - } - } + /* + * As we may report that the fence is signaled before all + * callbacks are complete, we need to take an additional + * reference count on the array so that we do not free it too + * early. The core fence handling will only hold the reference + * until we signal the array as complete (but that is now + * insufficient). + */ + dma_fence_get(&array->base); + irq_dma_fence_array_work(&array->work); return true; } static bool dma_fence_array_signaled(struct dma_fence *fence) { struct dma_fence_array *array = to_dma_fence_array(fence); - int num_pending; + int num_pending, error = 0; unsigned int i; /* - * We need to read num_pending before checking the enable_signal bit - * to avoid racing with the enable_signaling() implementation, which - * might decrement the counter, and cause a partial check. - * atomic_read_acquire() pairs with atomic_dec_and_test() in - * dma_fence_array_enable_signaling() - * - * The !--num_pending check is here to account for the any_signaled case - * if we race with enable_signaling(), that means the !num_pending check - * in the is_signalling_enabled branch might be outdated (num_pending - * might have been decremented), but that's fine. The user will get the - * right value when testing again later. + * Reading num_pending is just an optimization, it is perfectly + * acceptable to have a stale value for it. */ - num_pending = atomic_read_acquire(&array->num_pending); - if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &array->base.flags)) { - if (num_pending <= 0) - goto signal; - return false; - } + num_pending = READ_ONCE(array->num_pending); + for (i = 0; i < num_pending; ++i) { + struct dma_fence *f = array->fences[i]; - for (i = 0; i < array->num_fences; ++i) { - if (dma_fence_is_signaled(array->fences[i]) && !--num_pending) - goto signal; - } - return false; + if (!dma_fence_is_signaled(f)) + return false; -signal: + if (!error) + error = f->error; + } + dma_fence_array_set_pending_error(array, error); dma_fence_array_clear_pending_error(array); return true; } @@ -171,15 +145,12 @@ EXPORT_SYMBOL(dma_fence_array_ops); /** * dma_fence_array_alloc - Allocate a custom fence array - * @num_fences: [in] number of fences to add in the array * * Return dma fence array on success, NULL on failure */ -struct dma_fence_array *dma_fence_array_alloc(int num_fences) +struct dma_fence_array *dma_fence_array_alloc(void) { - struct dma_fence_array *array; - - return kzalloc_flex(*array, callbacks, num_fences); + return kzalloc_obj(struct dma_fence_array); } EXPORT_SYMBOL(dma_fence_array_alloc); @@ -190,21 +161,22 @@ EXPORT_SYMBOL(dma_fence_array_alloc); * @fences: [in] array containing the fences * @context: [in] fence context to use * @seqno: [in] sequence number to use - * @signal_on_any: [in] signal on any fence in the array * * Implementation of @dma_fence_array_create without allocation. Useful to init * a preallocated dma fence array in the path of reclaim or dma fence signaling. */ void dma_fence_array_init(struct dma_fence_array *array, int num_fences, struct dma_fence **fences, - u64 context, unsigned seqno, - bool signal_on_any) + u64 context, unsigned seqno) { static struct lock_class_key dma_fence_array_lock_key; WARN_ON(!num_fences || !fences); array->num_fences = num_fences; + array->num_pending = num_fences; + array->fences = fences; + array->base.error = PENDING_ERROR; dma_fence_init(&array->base, &dma_fence_array_ops, NULL, context, seqno); @@ -222,11 +194,6 @@ void dma_fence_array_init(struct dma_fence_array *array, */ lockdep_set_class(&array->base.inline_lock, &dma_fence_array_lock_key); - atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences); - array->fences = fences; - - array->base.error = PENDING_ERROR; - /* * dma_fence_array objects should never contain any other fence * containers or otherwise we run into recursion and potential kernel @@ -249,7 +216,6 @@ EXPORT_SYMBOL(dma_fence_array_init); * @fences: [in] array containing the fences * @context: [in] fence context to use * @seqno: [in] sequence number to use - * @signal_on_any: [in] signal on any fence in the array * * Allocate a dma_fence_array object and initialize the base fence with * dma_fence_init(). @@ -264,17 +230,16 @@ EXPORT_SYMBOL(dma_fence_array_init); */ struct dma_fence_array *dma_fence_array_create(int num_fences, struct dma_fence **fences, - u64 context, unsigned seqno, - bool signal_on_any) + u64 context, unsigned seqno) { struct dma_fence_array *array; - array = dma_fence_array_alloc(num_fences); + array = dma_fence_array_alloc(); if (!array) return NULL; dma_fence_array_init(array, num_fences, fences, - context, seqno, signal_on_any); + context, seqno); return array; } diff --git a/drivers/dma-buf/dma-fence-unwrap.c b/drivers/dma-buf/dma-fence-unwrap.c index 07fe9bf45aea..53bb40e70b27 100644 --- a/drivers/dma-buf/dma-fence-unwrap.c +++ b/drivers/dma-buf/dma-fence-unwrap.c @@ -180,8 +180,7 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences, if (count > 1) { result = dma_fence_array_create(count, array, - dma_fence_context_alloc(1), - 1, false); + dma_fence_context_alloc(1), 1); if (!result) { for (i = 0; i < count; i++) dma_fence_put(array[i]); diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index ce9e6c04897f..39a92d9f2413 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -648,8 +648,7 @@ int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage, } array = dma_fence_array_create(count, fences, - dma_fence_context_alloc(1), - 1, false); + dma_fence_context_alloc(1), 1); if (!array) { while (count--) dma_fence_put(fences[count]); diff --git a/drivers/dma-buf/st-dma-fence-unwrap.c b/drivers/dma-buf/st-dma-fence-unwrap.c index 9c74195f47fd..45413666970e 100644 --- a/drivers/dma-buf/st-dma-fence-unwrap.c +++ b/drivers/dma-buf/st-dma-fence-unwrap.c @@ -65,7 +65,7 @@ static struct dma_fence *mock_array(unsigned int num_fences, ...) array = dma_fence_array_create(num_fences, fences, dma_fence_context_alloc(1), - 1, false); + 1); if (!array) goto error_free; return &array->base; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index e7918f896a26..1ac91a46d87f 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -3203,8 +3203,7 @@ eb_composite_fence_create(struct i915_execbuffer *eb, int out_fence_fd) fence_array = dma_fence_array_create(eb->num_batches, fences, eb->context->parallel.fence_context, - eb->context->parallel.seqno++, - false); + eb->context->parallel.seqno++); if (!fence_array) { kfree(fences); return ERR_PTR(-ENOMEM); diff --git a/drivers/gpu/drm/xe/xe_sync.c b/drivers/gpu/drm/xe/xe_sync.c index 24d6d9af20d6..37866768d64c 100644 --- a/drivers/gpu/drm/xe/xe_sync.c +++ b/drivers/gpu/drm/xe/xe_sync.c @@ -376,7 +376,7 @@ xe_sync_in_fence_get(struct xe_sync_entry *sync, int num_sync, xe_assert(vm->xe, current_fence == num_fence); cf = dma_fence_array_create(num_fence, fences, dma_fence_context_alloc(1), - 1, false); + 1); if (!cf) goto err_out; diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c index 548b0769b3ef..b916a9d90104 100644 --- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -3196,7 +3196,7 @@ static struct dma_fence *ops_execute(struct xe_vm *vm, goto err_trace; } - cf = dma_fence_array_alloc(n_fence); + cf = dma_fence_array_alloc(); if (!cf) { fence = ERR_PTR(-ENOMEM); goto err_out; @@ -3240,7 +3240,7 @@ static struct dma_fence *ops_execute(struct xe_vm *vm, xe_assert(vm->xe, current_fence == n_fence); dma_fence_array_init(cf, n_fence, fences, dma_fence_context_alloc(1), - 1, false); + 1); fence = &cf->base; for_each_tile(tile, vm->xe, id) { diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h index 370b3d2bba37..3ee55c0e2fa4 100644 --- a/include/linux/dma-fence-array.h +++ b/include/linux/dma-fence-array.h @@ -15,16 +15,6 @@ #include <linux/dma-fence.h> #include <linux/irq_work.h> -/** - * struct dma_fence_array_cb - callback helper for fence array - * @cb: fence callback structure for signaling - * @array: reference to the parent fence array object - */ -struct dma_fence_array_cb { - struct dma_fence_cb cb; - struct dma_fence_array *array; -}; - /** * struct dma_fence_array - fence to represent an array of fences * @base: fence base class @@ -33,18 +23,17 @@ struct dma_fence_array_cb { * @num_pending: fences in the array still pending * @fences: array of the fences * @work: internal irq_work function - * @callbacks: array of callback helpers + * @callback: callback structure for signaling */ struct dma_fence_array { struct dma_fence base; - unsigned num_fences; - atomic_t num_pending; + unsigned int num_fences; + unsigned int num_pending; struct dma_fence **fences; struct irq_work work; - - struct dma_fence_array_cb callbacks[] __counted_by(num_fences); + struct dma_fence_cb callback; }; /** @@ -78,16 +67,13 @@ to_dma_fence_array(struct dma_fence *fence) for (index = 0, fence = dma_fence_array_first(head); fence; \ ++(index), fence = dma_fence_array_next(head, index)) -struct dma_fence_array *dma_fence_array_alloc(int num_fences); +struct dma_fence_array *dma_fence_array_alloc(void); void dma_fence_array_init(struct dma_fence_array *array, int num_fences, struct dma_fence **fences, - u64 context, unsigned seqno, - bool signal_on_any); - + u64 context, unsigned seqno); struct dma_fence_array *dma_fence_array_create(int num_fences, struct dma_fence **fences, - u64 context, unsigned seqno, - bool signal_on_any); + u64 context, unsigned seqno); bool dma_fence_match_context(struct dma_fence *fence, u64 context); -- 2.43.0

1 week, 6 days

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2 weeks

Healthy Shih Tzu puppies for sale

by Adorable Ferrets

2 weeks

Shih Tzu puppy price 2026

by Adorable Ferrets

2 weeks

Registered Shih Tzu puppies

by Adorable Ferrets

2 weeks

Local Shih Tzu puppies for sale

by Adorable Ferrets

2 weeks

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