From patchwork Thu May 29 05:34:54 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xu Yilun X-Patchwork-Id: 893234 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (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 CD3F325E462; Thu, 29 May 2025 05:42:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748497370; cv=none; b=Eh5ILgtp1bMhf7bGQhOfMHRvZR9NZ5K4BFaxeMhamOrYX6utjrOqdSJ7kO7nX43ViLz2cvXGsTzzcm8nCsTDGUYTJU63vOZcIeAjkc0fBuCZD8+ZTeTBUCol2bXwBoVEMyuiW8DA+3xkhNNQh+BW86zvcxhb+3vgoQXZeljmuNk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748497370; c=relaxed/simple; bh=ea45/wy6aelPF2+M9pYlfuxLHzoZNKixVvebPZ8V9YU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=j9V8vKoB8Y1wx3GIDHvNM8osmjWBgOYrmAX40uHn3i91pcT57Mpe5rqoQIXaMqeKB0wkm/RHJwUtVEdnChnUkrOkYLLQzed7kQ8vx3gMtnAjtVmzINLJhNUkHUdhiLncMOHOyPfwK4gN+rUStRY6wOCN/mXvml/ytQbpczHu2w0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=mpgztUNu; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="mpgztUNu" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1748497369; x=1780033369; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ea45/wy6aelPF2+M9pYlfuxLHzoZNKixVvebPZ8V9YU=; b=mpgztUNueKIm5mQ4iYxy96/3vkvA8KdFmuvkrAWYptmlL4rUmE/fP9E1 KqfwqVL0vXCuVpD6EUKDA+koUfhsO9gBDL/Pj6hLWvm1pvelHLC/CHw0l JJjs//x2Hyrr59+IjGdgc/7xmEDIbxn8mXxMm2BP8uCPgsodkb1+3/WH2 M84rz1qXCKZ22dRxBAEUI0bRe/zi8RC8nPfgEqqy/4R7NUALacMIajlz4 /fQ5+1W90rmuAnGDasV4/PWVY0XohxQhC3I0RFH34c9yde0KIuRcTyeDD x1aCjPGNIuq+2cfFd8xsn1YZIc2ZBGGccMraTDh1rhRlmvyPYn267riyK Q==; X-CSE-ConnectionGUID: hO3/TYYBSu6AcZ1CRK+Xeg== X-CSE-MsgGUID: BTx15RoXTrOJnKKqTx8yrg== X-IronPort-AV: E=McAfee;i="6700,10204,11447"; a="67963074" X-IronPort-AV: E=Sophos;i="6.15,323,1739865600"; d="scan'208";a="67963074" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2025 22:42:49 -0700 X-CSE-ConnectionGUID: lpReMSdNTTqVdLXtIvyWcg== X-CSE-MsgGUID: rYdlzE95QFeNt+TED2GCkA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,323,1739865600"; d="scan'208";a="144443355" Received: from yilunxu-optiplex-7050.sh.intel.com ([10.239.159.165]) by fmviesa009.fm.intel.com with ESMTP; 28 May 2025 22:42:42 -0700 From: Xu Yilun To: kvm@vger.kernel.org, sumit.semwal@linaro.org, christian.koenig@amd.com, pbonzini@redhat.com, seanjc@google.com, alex.williamson@redhat.com, jgg@nvidia.com, dan.j.williams@intel.com, aik@amd.com, linux-coco@lists.linux.dev Cc: dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, vivek.kasireddy@intel.com, yilun.xu@intel.com, yilun.xu@linux.intel.com, linux-kernel@vger.kernel.org, lukas@wunner.de, yan.y.zhao@intel.com, daniel.vetter@ffwll.ch, leon@kernel.org, baolu.lu@linux.intel.com, zhenzhong.duan@intel.com, tao1.su@intel.com, linux-pci@vger.kernel.org, zhiw@nvidia.com, simona.vetter@ffwll.ch, shameerali.kolothum.thodi@huawei.com, aneesh.kumar@kernel.org, iommu@lists.linux.dev, kevin.tian@intel.com Subject: [RFC PATCH 11/30] KVM: vfio_dmabuf: Fetch VFIO specific dma-buf data for sanity check Date: Thu, 29 May 2025 13:34:54 +0800 Message-Id: <20250529053513.1592088-12-yilun.xu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250529053513.1592088-1-yilun.xu@linux.intel.com> References: <20250529053513.1592088-1-yilun.xu@linux.intel.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Fetch VFIO specific dma-buf data to see if the dma-buf is eligible to be assigned to CoCo VM as private MMIO. KVM expects host unaccessible MMIO regions been mapped in private roots. So need to identify VFIO dma-buf by successfully getting VFIO specific dma-buf data. VFIO dma-buf also provides the struct kvm *kvm handler for KVM to check if the owner device of the MMIO region is already assigned to the same CoCo VM. Signed-off-by: Xu Yilun --- virt/kvm/vfio_dmabuf.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/virt/kvm/vfio_dmabuf.c b/virt/kvm/vfio_dmabuf.c index c427ab39c68a..ef695039402f 100644 --- a/virt/kvm/vfio_dmabuf.c +++ b/virt/kvm/vfio_dmabuf.c @@ -12,6 +12,22 @@ struct kvm_vfio_dmabuf { struct kvm_memory_slot *slot; }; +static struct vfio_dma_buf_data *kvm_vfio_dma_buf_get_data(struct dma_buf *dmabuf) +{ + struct vfio_dma_buf_data *(*fn)(struct dma_buf *dmabuf); + struct vfio_dma_buf_data *ret; + + fn = symbol_get(vfio_dma_buf_get_data); + if (!fn) + return ERR_PTR(-ENOENT); + + ret = fn(dmabuf); + + symbol_put(vfio_dma_buf_get_data); + + return ret; +} + static void kv_dmabuf_move_notify(struct dma_buf_attachment *attach) { struct kvm_vfio_dmabuf *kv_dmabuf = attach->importer_priv; @@ -48,6 +64,7 @@ int kvm_vfio_dmabuf_bind(struct kvm *kvm, struct kvm_memory_slot *slot, size_t size = slot->npages << PAGE_SHIFT; struct dma_buf_attachment *attach; struct kvm_vfio_dmabuf *kv_dmabuf; + struct vfio_dma_buf_data *data; struct dma_buf *dmabuf; int ret; @@ -60,6 +77,15 @@ int kvm_vfio_dmabuf_bind(struct kvm *kvm, struct kvm_memory_slot *slot, goto err_dmabuf; } + data = kvm_vfio_dma_buf_get_data(dmabuf); + if (IS_ERR(data)) + goto err_dmabuf; + + if (data->kvm != kvm) { + ret = -EINVAL; + goto err_dmabuf; + } + kv_dmabuf = kzalloc(sizeof(*kv_dmabuf), GFP_KERNEL); if (!kv_dmabuf) { ret = -ENOMEM;