From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9EE1E33939C for ; Wed, 22 Jul 2026 18:00:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784743258; cv=none; b=HPNHuiwzkvZbHPTORzec41CrskUjCw97lzJjwZGNvUoeoNFRY5OWpaQqLRixH2cuVD0MzsTtb/zLqJkqYCDmkLubZGVU9ENGoGNeq3yFZgqgieUCGevkzVEA2VR0jL9EEtjj2K+JYTVr1TNOE/gTqvqVSzsMuOksCy7sOEJJOBU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784743258; c=relaxed/simple; bh=+JgoYPdUS9pAPFer3Dly2MHTo6NqfIgX3hIkdIPd0MU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=a9HcDnC1HnxU7biDhyqKCMwtCdjixDUY19XtQdz9A4RpqdFO6AxOp8Zo7Txrb1Bc395WyAS54xxuvl2HljoXv85yPnb4AAjFx1qUGT8E0H6tT/JcbyK5hiViFgFnqsGZhrzFBoXcea1/eE3zQJHDNiIpAlXlOFWthlrpxWe0fZM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FbYU+FUt; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FbYU+FUt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED9BB1F00A3A; Wed, 22 Jul 2026 18:00:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784743256; bh=H7cV4NEtEWHwQhoOy+7vjzBdNtylg+KGiuFP0AI80F0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FbYU+FUtnRo8wN/vTMNpQqObZ+oRki5W26wHlJtm40toVTovNmwDZEYip7m67oFhD v403ZJqqmVOBwBxG8QeUf6O2kLvwoq/G3IswyRv7eRZniwegoiewEGdZhuBt5oHjWH HxtrQdVG0/YPmSH0yW9L9dhK2uS5nfkcDROY3+QpU07/5NLos1P6bDyqUAapsK6pFI 4yLeG+IyeZr1BnWuWFzlUffSuA6wVeqHDNEn2ZhPJVs+zw5BwoACz9MfhhfLTVYnUO 0GrhDbupnOr4qJ45JQ9j1nAhfTBH+lPfvcWj0kVdL9fxVjs322h9hDHYCC9N1Nm5A9 5BWlFm1gBXs7w== From: Sasha Levin To: stable@vger.kernel.org Cc: =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Jason Wang , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 6.6.y 3/4] vduse: take out allocations from vduse_dev_alloc_coherent Date: Wed, 22 Jul 2026 14:00:51 -0400 Message-ID: <20260722180052.2184339-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260722180052.2184339-1-sashal@kernel.org> References: <2026072041-rectal-mammogram-740b@gregkh> <20260722180052.2184339-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Eugenio Pérez [ Upstream commit 489d76520612abf9a4ede4344349105406c91a73 ] The function vduse_dev_alloc_coherent will be called under rwlock in next patches. Make it out of the lock to avoid increasing its fail rate. Acked-by: Jason Wang Signed-off-by: Eugenio Pérez Signed-off-by: Michael S. Tsirkin Message-Id: <20260119143306.1818855-10-eperezma@redhat.com> Stable-dep-of: 9c1523803445 ("VDUSE: avoid leaking information to userspace") Signed-off-by: Sasha Levin --- drivers/vdpa/vdpa_user/iova_domain.c | 24 +++++++----------------- drivers/vdpa/vdpa_user/iova_domain.h | 5 ++--- drivers/vdpa/vdpa_user/vduse_dev.c | 14 ++++++++++---- 3 files changed, 19 insertions(+), 24 deletions(-) diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c index b686561be40031..2b1ee3f1ba6c92 100644 --- a/drivers/vdpa/vdpa_user/iova_domain.c +++ b/drivers/vdpa/vdpa_user/iova_domain.c @@ -479,17 +479,15 @@ void vduse_domain_unmap_page(struct vduse_iova_domain *domain, vduse_domain_free_iova(iovad, dma_addr, size); } -void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, - size_t size, dma_addr_t *dma_addr, - gfp_t flag, unsigned long attrs) +dma_addr_t vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, + size_t size, void *orig) { struct iova_domain *iovad = &domain->consistent_iovad; unsigned long limit = domain->iova_limit; dma_addr_t iova = vduse_domain_alloc_iova(iovad, size, limit); - void *orig = alloc_pages_exact(size, flag); - if (!iova || !orig) - goto err; + if (!iova) + return DMA_MAPPING_ERROR; spin_lock(&domain->iotlb_lock); if (vduse_iotlb_add_range(domain, (u64)iova, (u64)iova + size - 1, @@ -500,17 +498,12 @@ void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, } spin_unlock(&domain->iotlb_lock); - *dma_addr = iova; + return iova; - return orig; err: - *dma_addr = DMA_MAPPING_ERROR; - if (orig) - free_pages_exact(orig, size); - if (iova) - vduse_domain_free_iova(iovad, iova, size); + vduse_domain_free_iova(iovad, iova, size); - return NULL; + return DMA_MAPPING_ERROR; } void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, @@ -519,7 +512,6 @@ void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, struct iova_domain *iovad = &domain->consistent_iovad; struct vhost_iotlb_map *map; struct vdpa_map_file *map_file; - phys_addr_t pa; spin_lock(&domain->iotlb_lock); map = vhost_iotlb_itree_first(domain->iotlb, (u64)dma_addr, @@ -531,12 +523,10 @@ void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, map_file = (struct vdpa_map_file *)map->opaque; fput(map_file->file); kfree(map_file); - pa = map->addr; vhost_iotlb_map_free(domain->iotlb, map); spin_unlock(&domain->iotlb_lock); vduse_domain_free_iova(iovad, dma_addr, size); - free_pages_exact(phys_to_virt(pa), size); } static vm_fault_t vduse_domain_mmap_fault(struct vm_fault *vmf) diff --git a/drivers/vdpa/vdpa_user/iova_domain.h b/drivers/vdpa/vdpa_user/iova_domain.h index b07dd9eff1056a..14b4370ce93963 100644 --- a/drivers/vdpa/vdpa_user/iova_domain.h +++ b/drivers/vdpa/vdpa_user/iova_domain.h @@ -58,9 +58,8 @@ void vduse_domain_unmap_page(struct vduse_iova_domain *domain, dma_addr_t dma_addr, size_t size, enum dma_data_direction dir, unsigned long attrs); -void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, - size_t size, dma_addr_t *dma_addr, - gfp_t flag, unsigned long attrs); +dma_addr_t vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, + size_t size, void *orig); void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, dma_addr_t dma_addr, unsigned long attrs); diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index ab6045d6154f3f..f576e50c7ae8da 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -828,18 +828,23 @@ static void *vduse_dev_alloc_coherent(struct device *dev, size_t size, { struct vduse_dev *vdev = dev_to_vduse(dev); struct vduse_iova_domain *domain = vdev->domain; - unsigned long iova; void *addr; *dma_addr = DMA_MAPPING_ERROR; - addr = vduse_domain_alloc_coherent(domain, size, - (dma_addr_t *)&iova, flag, attrs); + + addr = alloc_pages_exact(size, flag); if (!addr) return NULL; - *dma_addr = (dma_addr_t)iova; + *dma_addr = vduse_domain_alloc_coherent(domain, size, addr); + if (*dma_addr == DMA_MAPPING_ERROR) + goto err; return addr; + +err: + free_pages_exact(addr, size); + return NULL; } static void vduse_dev_free_coherent(struct device *dev, size_t size, @@ -850,6 +855,7 @@ static void vduse_dev_free_coherent(struct device *dev, size_t size, struct vduse_iova_domain *domain = vdev->domain; vduse_domain_free_coherent(domain, size, dma_addr, attrs); + free_pages_exact(vaddr, size); } static size_t vduse_dev_max_mapping_size(struct device *dev) -- 2.53.0