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a="65924065" X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="65924065" X-CSE-ConnectionGUID: gw+9KSDCSXKfXqxve99/zw== X-CSE-MsgGUID: 8QGQgzomSG683EBwUcGJGw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="191064605" From: Vivek Kasireddy To: qemu-devel@nongnu.org Cc: Vivek Kasireddy , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Akihiko Odaki , Dmitry Osipenko , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v3 2/9] virtio-gpu: Find hva for Guest's DMA addr associated with a ram device Date: Fri, 21 Nov 2025 22:46:23 -0800 Message-ID: <20251122064936.2948632-3-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251122064936.2948632-1-vivek.kasireddy@intel.com> References: <20251122064936.2948632-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.14; envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, T_SPF_HELO_TEMPERROR=0.01, T_SPF_TEMPERROR=0.01 autolearn=no 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1763797777940018900 If the Guest provides a DMA address that is associated with a ram device (such as a PCI device region and not its system memory), then we can obtain the hva (host virtual address) by invoking address_space_translate() followed by memory_region_get_ram_ptr(). This is because the ram device's address space is not accessible to virtio-gpu directly and hence dma_memory_map() cannot be used. Therefore, we first need to identify the memory region associated with the DMA address and add the offset to the pointer returned from memory_region_get_ram_ptr() to obtain the host address. Note that we take a reference on the memory region but we would still eventually call dma_memory_unmap() (to unref the mr). Cc: Marc-Andr=C3=A9 Lureau Cc: Alex Benn=C3=A9e Cc: Akihiko Odaki Cc: Dmitry Osipenko Cc: Alex Williamson Cc: C=C3=A9dric Le Goater Signed-off-by: Vivek Kasireddy --- hw/display/virtio-gpu.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index 199b18c746..d746c5f426 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -798,6 +798,23 @@ static void virtio_gpu_set_scanout_blob(VirtIOGPU *g, &fb, res, &ss.r, &cmd->error); } =20 +static void *virtio_gpu_dma_memory_map(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd, + uint64_t a, hwaddr *len) +{ + MemoryRegion *mr; + hwaddr xlat; + + mr =3D address_space_translate(VIRTIO_DEVICE(g)->dma_as, a, &xlat, len, + DMA_DIRECTION_TO_DEVICE, + MEMTXATTRS_UNSPECIFIED); + if (memory_region_is_ram(mr)) { + memory_region_ref(mr); + return memory_region_get_ram_ptr(mr) + xlat; + } + return NULL; +} + int virtio_gpu_create_mapping_iov(VirtIOGPU *g, uint32_t nr_entries, uint32_t offset, struct virtio_gpu_ctrl_command *cmd, @@ -839,9 +856,7 @@ int virtio_gpu_create_mapping_iov(VirtIOGPU *g, =20 do { len =3D l; - map =3D dma_memory_map(VIRTIO_DEVICE(g)->dma_as, a, &len, - DMA_DIRECTION_TO_DEVICE, - MEMTXATTRS_UNSPECIFIED); + map =3D virtio_gpu_dma_memory_map(g, cmd, a, &len); if (!map) { qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to map MMIO mem= ory for" " element %d\n", __func__, e); --=20 2.50.1