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virtio-pci: add handling of PCI ATS and Device-TLB enable/disable

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According to PCIe Address Translation Services specification 5.1.3.,
ATS Control Register has Enable bit to enable/disable ATS. Guest may
enable/disable PCI ATS and, accordingly, Device-TLB for the VirtIO PCI
device. So, raise/lower a flag and call a trigger function to pass this
event to a device implementation.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Message-Id: <20230512135122.70403-2-viktor@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Viktor Prutyanov 2023-05-12 16:51:20 +03:00 committed by Michael S. Tsirkin
parent 9e57b81861
commit 206e91d143
2 changed files with 38 additions and 0 deletions
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36
hw/virtio/virtio-pci.c
View File

@ -716,6 +716,38 @@ virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr,
}
}
static void virtio_pci_ats_ctrl_trigger(PCIDevice *pci_dev, bool enable)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
vdev->device_iotlb_enabled = enable;
if (k->toggle_device_iotlb) {
k->toggle_device_iotlb(vdev);
}
}
static void pcie_ats_config_write(PCIDevice *dev, uint32_t address,
uint32_t val, int len)
{
uint32_t off;
uint16_t ats_cap = dev->exp.ats_cap;
if (!ats_cap || address < ats_cap) {
return;
}
off = address - ats_cap;
if (off >= PCI_EXT_CAP_ATS_SIZEOF) {
return;
}
if (range_covers_byte(off, len, PCI_ATS_CTRL + 1)) {
virtio_pci_ats_ctrl_trigger(dev, !!(val & PCI_ATS_CTRL_ENABLE));
}
}
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
uint32_t val, int len)
{
@ -729,6 +761,10 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
pcie_cap_flr_write_config(pci_dev, address, val, len);
}
if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
pcie_ats_config_write(pci_dev, address, val, len);
}
if (range_covers_byte(address, len, PCI_COMMAND)) {
if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
virtio_set_disabled(vdev, true);

2
include/hw/virtio/virtio.h
View File

@ -155,6 +155,7 @@ struct VirtIODevice
QLIST_HEAD(, VirtQueue) *vector_queues;
QTAILQ_ENTRY(VirtIODevice) next;
EventNotifier config_notifier;
bool device_iotlb_enabled;
};
struct VirtioDeviceClass {
@ -212,6 +213,7 @@ struct VirtioDeviceClass {
const VMStateDescription *vmsd;
bool (*primary_unplug_pending)(void *opaque);
struct vhost_dev *(*get_vhost)(VirtIODevice *vdev);
void (*toggle_device_iotlb)(VirtIODevice *vdev);
};
void virtio_instance_init_common(Object *proxy_obj, void *data,