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Tsirkin" , Albert Esteve Subject: [RFC PATCH v2 3/5] vhost-user-dev: Add cache BAR Date: Fri, 28 Jun 2024 16:57:08 +0200 Message-ID: <20240628145710.1516121-4-aesteve@redhat.com> In-Reply-To: <20240628145710.1516121-1-aesteve@redhat.com> References: <20240628145710.1516121-1-aesteve@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.129.124; envelope-from=aesteve@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.206, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add a cache BAR in the vhost-user-device into which files can be directly mapped. The number, shmid, and size of the VIRTIO Shared Memory subregions is retrieved through a get_shmem_config message sent by the vhost-user-base module on the realize step, after virtio_init(). By default, if VHOST_USER_PROTOCOL_F_SHMEM feature is not supported by the backend, there is no cache. Signed-off-by: Albert Esteve --- hw/virtio/vhost-user-base.c | 39 +++++++++++++++++++++++++++++-- hw/virtio/vhost-user-device-pci.c | 37 ++++++++++++++++++++++++++--- 2 files changed, 71 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c index a83167191e..e47c568a55 100644 --- a/hw/virtio/vhost-user-base.c +++ b/hw/virtio/vhost-user-base.c @@ -268,7 +268,9 @@ static void vub_device_realize(DeviceState *dev, Error **errp) { VirtIODevice *vdev = VIRTIO_DEVICE(dev); VHostUserBase *vub = VHOST_USER_BASE(dev); - int ret; + uint64_t memory_sizes[8]; + void *cache_ptr; + int i, ret, nregions; if (!vub->chardev.chr) { error_setg(errp, "vhost-user-base: missing chardev"); @@ -311,7 +313,7 @@ static void vub_device_realize(DeviceState *dev, Error **errp) /* Allocate queues */ vub->vqs = g_ptr_array_sized_new(vub->num_vqs); - for (int i = 0; i < vub->num_vqs; i++) { + for (i = 0; i < vub->num_vqs; i++) { g_ptr_array_add(vub->vqs, virtio_add_queue(vdev, vub->vq_size, vub_handle_output)); @@ -328,6 +330,39 @@ static void vub_device_realize(DeviceState *dev, Error **errp) do_vhost_user_cleanup(vdev, vub); } + ret = vub->vhost_dev.vhost_ops->vhost_get_shmem_config(&vub->vhost_dev, + &nregions, + memory_sizes, + errp); + + if (ret < 0) { + do_vhost_user_cleanup(vdev, vub); + } + + for (i = 0; i < nregions; i++) { + if (memory_sizes[i]) { + if (!is_power_of_2(memory_sizes[i]) || + memory_sizes[i] < qemu_real_host_page_size()) { + error_setg(errp, "Shared memory %d size must be a power of 2 " + "no smaller than the page size", i); + return; + } + + cache_ptr = mmap(NULL, memory_sizes[i], PROT_READ, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + if (cache_ptr == MAP_FAILED) { + error_setg(errp, "Unable to mmap blank cache: %s", + strerror(errno)); + return; + } + + virtio_new_shmem_region(vdev); + memory_region_init_ram_ptr(&vdev->shmem_list[i], + OBJECT(vdev), "vub-shm-" + i, + memory_sizes[i], cache_ptr); + } + } + qemu_chr_fe_set_handlers(&vub->chardev, NULL, NULL, vub_event, NULL, dev, NULL, true); } diff --git a/hw/virtio/vhost-user-device-pci.c b/hw/virtio/vhost-user-device-pci.c index efaf55d3dd..314bacfb7a 100644 --- a/hw/virtio/vhost-user-device-pci.c +++ b/hw/virtio/vhost-user-device-pci.c @@ -8,14 +8,18 @@ */ #include "qemu/osdep.h" +#include "qapi/error.h" #include "hw/qdev-properties.h" #include "hw/virtio/vhost-user-base.h" #include "hw/virtio/virtio-pci.h" +#define VIRTIO_DEVICE_PCI_CACHE_BAR 2 + struct VHostUserDevicePCI { VirtIOPCIProxy parent_obj; VHostUserBase vub; + MemoryRegion cachebar; }; #define TYPE_VHOST_USER_DEVICE_PCI "vhost-user-device-pci-base" @@ -25,10 +29,37 @@ OBJECT_DECLARE_SIMPLE_TYPE(VHostUserDevicePCI, VHOST_USER_DEVICE_PCI) static void vhost_user_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp) { VHostUserDevicePCI *dev = VHOST_USER_DEVICE_PCI(vpci_dev); - DeviceState *vdev = DEVICE(&dev->vub); - + DeviceState *dev_state = DEVICE(&dev->vub); + VirtIODevice *vdev = VIRTIO_DEVICE(dev_state); + uint64_t offset = 0, cache_size = 0; + int i; + vpci_dev->nvectors = 1; - qdev_realize(vdev, BUS(&vpci_dev->bus), errp); + qdev_realize(dev_state, BUS(&vpci_dev->bus), errp); + + for (i = 0; i < vdev->n_shmem_regions; i++) { + if (vdev->shmem_list[i].size > UINT64_MAX - cache_size) { + error_setg(errp, "Total shared memory required overflow"); + return; + } + cache_size = cache_size + vdev->shmem_list[i].size; + } + if (cache_size) { + memory_region_init(&dev->cachebar, OBJECT(vpci_dev), + "vhost-device-pci-cachebar", cache_size); + for (i = 0; i < vdev->n_shmem_regions; i++) { + memory_region_add_subregion(&dev->cachebar, offset, + &vdev->shmem_list[i]); + virtio_pci_add_shm_cap(vpci_dev, VIRTIO_DEVICE_PCI_CACHE_BAR, + offset, vdev->shmem_list[i].size, i); + offset = offset + vdev->shmem_list[i].size; + } + pci_register_bar(&vpci_dev->pci_dev, VIRTIO_DEVICE_PCI_CACHE_BAR, + PCI_BASE_ADDRESS_SPACE_MEMORY | + PCI_BASE_ADDRESS_MEM_PREFETCH | + PCI_BASE_ADDRESS_MEM_TYPE_64, + &dev->cachebar); + } } static void vhost_user_device_pci_class_init(ObjectClass *klass, void *data)