diff options
Diffstat (limited to 'virtio/mmio-legacy.c')
| -rw-r--r-- | virtio/mmio-legacy.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/virtio/mmio-legacy.c b/virtio/mmio-legacy.c new file mode 100644 index 00000000..7ca7e69f --- /dev/null +++ b/virtio/mmio-legacy.c @@ -0,0 +1,150 @@ +#include "kvm/ioport.h" +#include "kvm/virtio.h" +#include "kvm/virtio-mmio.h" + +#include <linux/virtio_mmio.h> + +#define vmmio_selected_vq(vdev, vmmio) \ + (vdev)->ops->get_vq((vmmio)->kvm, (vmmio)->dev, (vmmio)->hdr.queue_sel) + +static void virtio_mmio_config_in(struct kvm_cpu *vcpu, + u64 addr, void *data, u32 len, + struct virtio_device *vdev) +{ + struct virtio_mmio *vmmio = vdev->virtio; + struct virt_queue *vq; + u32 val = 0; + + switch (addr) { + case VIRTIO_MMIO_MAGIC_VALUE: + case VIRTIO_MMIO_VERSION: + case VIRTIO_MMIO_DEVICE_ID: + case VIRTIO_MMIO_VENDOR_ID: + case VIRTIO_MMIO_STATUS: + case VIRTIO_MMIO_INTERRUPT_STATUS: + ioport__write32(data, *(u32 *)(((void *)&vmmio->hdr) + addr)); + break; + case VIRTIO_MMIO_DEVICE_FEATURES: + if (vmmio->hdr.host_features_sel == 0) + val = vdev->ops->get_host_features(vmmio->kvm, + vmmio->dev); + ioport__write32(data, val); + break; + case VIRTIO_MMIO_QUEUE_PFN: + vq = vmmio_selected_vq(vdev, vmmio); + ioport__write32(data, vq->vring_addr.pfn); + break; + case VIRTIO_MMIO_QUEUE_NUM_MAX: + val = vdev->ops->get_size_vq(vmmio->kvm, vmmio->dev, + vmmio->hdr.queue_sel); + ioport__write32(data, val); + break; + default: + break; + } +} + +static void virtio_mmio_config_out(struct kvm_cpu *vcpu, + u64 addr, void *data, u32 len, + struct virtio_device *vdev) +{ + struct virtio_mmio *vmmio = vdev->virtio; + struct kvm *kvm = vmmio->kvm; + unsigned int vq_count = vdev->ops->get_vq_count(kvm, vmmio->dev); + struct virt_queue *vq; + u32 val = 0; + + switch (addr) { + case VIRTIO_MMIO_DEVICE_FEATURES_SEL: + case VIRTIO_MMIO_DRIVER_FEATURES_SEL: + val = ioport__read32(data); + *(u32 *)(((void *)&vmmio->hdr) + addr) = val; + break; + case VIRTIO_MMIO_QUEUE_SEL: + val = ioport__read32(data); + if (val >= vq_count) { + WARN_ONCE(1, "QUEUE_SEL value (%u) is larger than VQ count (%u)\n", + val, vq_count); + break; + } + *(u32 *)(((void *)&vmmio->hdr) + addr) = val; + break; + case VIRTIO_MMIO_STATUS: + vmmio->hdr.status = ioport__read32(data); + if (!vmmio->hdr.status) /* Sample endianness on reset */ + vdev->endian = kvm_cpu__get_endianness(vcpu); + virtio_notify_status(kvm, vdev, vmmio->dev, vmmio->hdr.status); + break; + case VIRTIO_MMIO_DRIVER_FEATURES: + if (vmmio->hdr.guest_features_sel == 0) { + val = ioport__read32(data); + virtio_set_guest_features(vmmio->kvm, vdev, + vmmio->dev, val); + } + break; + case VIRTIO_MMIO_GUEST_PAGE_SIZE: + val = ioport__read32(data); + vmmio->hdr.guest_page_size = val; + break; + case VIRTIO_MMIO_QUEUE_NUM: + val = ioport__read32(data); + vmmio->hdr.queue_num = val; + vdev->ops->set_size_vq(vmmio->kvm, vmmio->dev, + vmmio->hdr.queue_sel, val); + break; + case VIRTIO_MMIO_QUEUE_ALIGN: + val = ioport__read32(data); + vmmio->hdr.queue_align = val; + break; + case VIRTIO_MMIO_QUEUE_PFN: + val = ioport__read32(data); + if (val) { + vq = vmmio_selected_vq(vdev, vmmio); + vq->vring_addr = (struct vring_addr) { + .legacy = true, + .pfn = val, + .align = vmmio->hdr.queue_align, + .pgsize = vmmio->hdr.guest_page_size, + }; + virtio_mmio_init_vq(kvm, vdev, vmmio->hdr.queue_sel); + } else { + virtio_mmio_exit_vq(kvm, vdev, vmmio->hdr.queue_sel); + } + break; + case VIRTIO_MMIO_QUEUE_NOTIFY: + val = ioport__read32(data); + if (val >= vq_count) { + WARN_ONCE(1, "QUEUE_NOTIFY value (%u) is larger than VQ count (%u)\n", + val, vq_count); + break; + } + vdev->ops->notify_vq(vmmio->kvm, vmmio->dev, val); + break; + case VIRTIO_MMIO_INTERRUPT_ACK: + val = ioport__read32(data); + vmmio->hdr.interrupt_state &= ~val; + break; + default: + break; + }; +} + +void virtio_mmio_legacy_callback(struct kvm_cpu *vcpu, u64 addr, u8 *data, + u32 len, u8 is_write, void *ptr) +{ + struct virtio_device *vdev = ptr; + struct virtio_mmio *vmmio = vdev->virtio; + u32 offset = addr - vmmio->addr; + + if (offset >= VIRTIO_MMIO_CONFIG) { + offset -= VIRTIO_MMIO_CONFIG; + virtio_access_config(vmmio->kvm, vdev, vmmio->dev, offset, data, + len, is_write); + return; + } + + if (is_write) + virtio_mmio_config_out(vcpu, offset, data, len, ptr); + else + virtio_mmio_config_in(vcpu, offset, data, len, ptr); +} |