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vm-virtio: mmio: Enable reporting of SHM regions via config fields

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The details of the SHM regions or the lack of, which is used by
virtio-fs DAX, is communicated through configuration fields on the
virtio-mmio memory region. Implement the necessary fields to return the
SHM entries and in particular return a length of (u64)-1 which is used
by the kernel to indicate there are no SHM regions.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-03-03 17:31:15 +00:00 committed by Sebastien Boeuf
parent 0223cf8c2b
commit 642b890b0f
1 changed files with 31 additions and 0 deletions
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31
vm-virtio/src/transport/mmio.rs
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@ -86,6 +86,7 @@ pub struct MmioDevice {
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
mem: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
shm_region_select: u32,
}
impl MmioDevice {
@ -118,6 +119,7 @@ impl MmioDevice {
queues,
queue_evts,
mem: Some(mem),
shm_region_select: 0,
})
}
@ -200,6 +202,34 @@ impl BusDevice for MmioDevice {
0x60 => self.interrupt_status.load(Ordering::SeqCst) as u32,
0x70 => self.driver_status,
0xfc => self.config_generation,
0xb0..=0xbc => {
// For no SHM region or invalid region the kernel looks for length of -1
let (shm_offset, shm_len) = if let Some(shm_regions) =
self.device.lock().unwrap().get_shm_regions()
{
if self.shm_region_select as usize > shm_regions.region_list.len() {
(0, !0 as u64)
} else {
(
shm_regions.region_list[self.shm_region_select as usize].offset
+ shm_regions.addr.0,
shm_regions.region_list[self.shm_region_select as usize].len,
)
}
} else {
(0, !0 as u64)
};
match offset {
0xb0 => shm_len as u32,
0xb4 => (shm_len >> 32) as u32,
0xb8 => shm_offset as u32,
0xbc => (shm_offset >> 32) as u32,
_ => {
error!("invalid shm region offset");
0
}
}
}
_ => {
warn!("unknown virtio mmio register read: 0x{:x}", offset);
return;
@ -265,6 +295,7 @@ impl BusDevice for MmioDevice {
0x94 => mut_q = self.with_queue_mut(|q| hi(&mut q.avail_ring, v)),
0xa0 => mut_q = self.with_queue_mut(|q| lo(&mut q.used_ring, v)),
0xa4 => mut_q = self.with_queue_mut(|q| hi(&mut q.used_ring, v)),
0xac => self.shm_region_select = v,
_ => {
warn!("unknown virtio mmio register write: 0x{:x}", offset);
return;