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| author | Viktor Prutyanov <viktor@daynix.com> | 2023-05-12 16:51:20 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-05-19 10:30:46 -0400 |
| commit | 206e91d143301414df2deb48a411e402414ba6db (patch) | |
| tree | 3021030f8d513e9d6539d0cee5e45dcff3a52b4c /hw | |
| parent | 9e57b81861e05b2856ed1c4fbc2d991801c7c777 (diff) | |
| download | qemu-206e91d143301414df2deb48a411e402414ba6db.zip qemu-206e91d143301414df2deb48a411e402414ba6db.tar.gz qemu-206e91d143301414df2deb48a411e402414ba6db.tar.bz2 | |
virtio-pci: add handling of PCI ATS and Device-TLB enable/disable
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>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/virtio/virtio-pci.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 02fb84a..edbc0da 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -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); |