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 <aest...@redhat.com>
---
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)
--
2.45.2
