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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1726152853; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fCIUDDzY8Nmpe0C6EnAPszeGwSqsgVRES6S6Gvetf6Y=; b=NecqnzenQLSkjdlwpXkfBKVQHQZ7TgdjUWAQGSZH2koZZt+0aN8u425FqaY9XFAHfzhSUG rN6nyYUUiOaPmptyAJY6SgwpjswuXttuKrvSDUJOdLApI+lS75VvhrXgs9QRvF6QSV+aol FF8S+A0nce1mnVMEV/RauaMuTtxAE68= X-MC-Unique: yeLnVzR6M16vjycexhv8EA-1 From: Albert Esteve To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , slp@redhat.com, hi@alyssa.is, mst@redhat.com, david@redhat.com, jasowang@redhat.com, stefanha@redhat.com, Stefano Garzarella , stevensd@chromium.org, Albert Esteve Subject: [PATCH v3 4/5] vhost-user-dev: Add cache BAR Date: Thu, 12 Sep 2024 16:53:34 +0200 Message-ID: <20240912145335.129447-5-aesteve@redhat.com> In-Reply-To: <20240912145335.129447-1-aesteve@redhat.com> References: <20240912145335.129447-1-aesteve@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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=170.10.129.124; envelope-from=aesteve@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.143, 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_H3=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1726152876358116600 Content-Type: text/plain; charset="utf-8" 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 | 37 +++++++++++++++++++++++++++-- hw/virtio/vhost-user-device-pci.c | 39 ++++++++++++++++++++++++++++--- 2 files changed, 71 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c index 2bc3423326..f2597d021a 100644 --- a/hw/virtio/vhost-user-base.c +++ b/hw/virtio/vhost-user-base.c @@ -271,7 +271,9 @@ static void vub_device_realize(DeviceState *dev, Error = **errp) { VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); VHostUserBase *vub =3D VHOST_USER_BASE(dev); - int ret; + uint64_t memory_sizes[8]; + void *cache_ptr; + int i, ret, nregions; =20 if (!vub->chardev.chr) { error_setg(errp, "vhost-user-base: missing chardev"); @@ -314,7 +316,7 @@ static void vub_device_realize(DeviceState *dev, Error = **errp) =20 /* Allocate queues */ vub->vqs =3D g_ptr_array_sized_new(vub->num_vqs); - for (int i =3D 0; i < vub->num_vqs; i++) { + for (i =3D 0; i < vub->num_vqs; i++) { g_ptr_array_add(vub->vqs, virtio_add_queue(vdev, vub->vq_size, vub_handle_output)); @@ -331,6 +333,37 @@ static void vub_device_realize(DeviceState *dev, Error= **errp) do_vhost_user_cleanup(vdev, vub); } =20 + ret =3D vub->vhost_dev.vhost_ops->vhost_get_shmem_config(&vub->vhost_d= ev, + &nregions, + memory_sizes, + errp); + + if (ret < 0) { + do_vhost_user_cleanup(vdev, vub); + } + + for (i =3D 0; i < nregions; i++) { + if (memory_sizes[i]) { + if (memory_sizes[i] % qemu_real_host_page_size() !=3D 0) { + error_setg(errp, "Shared memory %d size must be a power of= 2 " + "no smaller than the page size", i); + return; + } + + cache_ptr =3D mmap(NULL, memory_sizes[i], PROT_NONE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + if (cache_ptr =3D=3D MAP_FAILED) { + error_setg_errno(errp, errno, "Unable to mmap blank cache"= ); + return; + } + + virtio_new_shmem_region(vdev); + memory_region_init_ram_ptr(vdev->shmem_list[i].mr, + 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-devic= e-pci.c index efaf55d3dd..abf4e90c21 100644 --- a/hw/virtio/vhost-user-device-pci.c +++ b/hw/virtio/vhost-user-device-pci.c @@ -8,14 +8,18 @@ */ =20 #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" =20 +#define VIRTIO_DEVICE_PCI_CACHE_BAR 2 + struct VHostUserDevicePCI { VirtIOPCIProxy parent_obj; =20 VHostUserBase vub; + MemoryRegion cachebar; }; =20 #define TYPE_VHOST_USER_DEVICE_PCI "vhost-user-device-pci-base" @@ -25,10 +29,39 @@ OBJECT_DECLARE_SIMPLE_TYPE(VHostUserDevicePCI, VHOST_US= ER_DEVICE_PCI) static void vhost_user_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error = **errp) { VHostUserDevicePCI *dev =3D VHOST_USER_DEVICE_PCI(vpci_dev); - DeviceState *vdev =3D DEVICE(&dev->vub); - + DeviceState *dev_state =3D DEVICE(&dev->vub); + VirtIODevice *vdev =3D VIRTIO_DEVICE(dev_state); + MemoryRegion *mr; + uint64_t offset =3D 0, cache_size =3D 0; + int i; + =20 vpci_dev->nvectors =3D 1; - qdev_realize(vdev, BUS(&vpci_dev->bus), errp); + qdev_realize(dev_state, BUS(&vpci_dev->bus), errp); + + for (i =3D 0; i < vdev->n_shmem_regions; i++) { + mr =3D vdev->shmem_list[i].mr; + if (mr->size > UINT64_MAX - cache_size) { + error_setg(errp, "Total shared memory required overflow"); + return; + } + cache_size =3D cache_size + mr->size; + } + if (cache_size) { + memory_region_init(&dev->cachebar, OBJECT(vpci_dev), + "vhost-device-pci-cachebar", cache_size); + for (i =3D 0; i < vdev->n_shmem_regions; i++) { + mr =3D vdev->shmem_list[i].mr; + memory_region_add_subregion(&dev->cachebar, offset, mr); + virtio_pci_add_shm_cap(vpci_dev, VIRTIO_DEVICE_PCI_CACHE_BAR, + offset, mr->size, i); + offset =3D offset + mr->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); + } } =20 static void vhost_user_device_pci_class_init(ObjectClass *klass, void *dat= a) --=20 2.45.2