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pci, vmm: Defer mapping VFIO MMIO regions on restore

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When restoring a VM, the restore codepath will take care of mapping the
MMIO regions based on the information from the snapshot, rather than
having the mapping being performed during device creation.

When the device is created, information such as which BARs contain the
MSI-X tables are missing, preventing to perform the mapping of the MMIO
regions.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-06-08 16:41:24 +02:00
parent 7df7061610
commit 81ba70a497
3 changed files with 57 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
pci/src/vfio.rs
View File

@ -1139,6 +1139,7 @@ pub struct VfioPciDevice {
container: Arc<VfioContainer>,
common: VfioCommon,
iommu_attached: bool,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
}
impl VfioPciDevice {
@ -1154,6 +1155,7 @@ impl VfioPciDevice {
iommu_attached: bool,
bdf: PciBdf,
restoring: bool,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
) -> Result<Self, VfioPciError> {
let device = Arc::new(device);
device.reset();
@ -1201,6 +1203,7 @@ impl VfioPciDevice {
container,
common,
iommu_attached,
memory_slot,
};
Ok(vfio_pci_device)
@ -1310,14 +1313,7 @@ impl VfioPciDevice {
/// * `vm` - The VM object. It is used to set the VFIO MMIO regions
/// as user memory regions.
/// * `mem_slot` - The closure to return a memory slot.
pub fn map_mmio_regions<F>(
&mut self,
vm: &Arc<dyn hypervisor::Vm>,
mem_slot: F,
) -> Result<(), VfioPciError>
where
F: Fn() -> u32,
{
pub fn map_mmio_regions(&mut self) -> Result<(), VfioPciError> {
let fd = self.device.as_raw_fd();
for region in self.common.mmio_regions.iter_mut() {
@ -1383,7 +1379,7 @@ impl VfioPciDevice {
}
let user_memory_region = UserMemoryRegion {
slot: mem_slot(),
slot: (self.memory_slot)(),
start: region.start.0 + area.offset,
size: area.size,
host_addr: host_addr as u64,
@ -1391,7 +1387,7 @@ impl VfioPciDevice {
region.user_memory_regions.push(user_memory_region);
let mem_region = vm.make_user_memory_region(
let mem_region = self.vm.make_user_memory_region(
user_memory_region.slot,
user_memory_region.start,
user_memory_region.size,
@ -1400,7 +1396,8 @@ impl VfioPciDevice {
false,
);
vm.create_user_memory_region(mem_region)
self.vm
.create_user_memory_region(mem_region)
.map_err(VfioPciError::CreateUserMemoryRegion)?;
}
}
@ -1645,6 +1642,12 @@ impl Snapshottable for VfioPciDevice {
// Restore VfioCommon
if let Some(vfio_common_snapshot) = snapshot.snapshots.get(&self.common.id()) {
self.common.restore(*vfio_common_snapshot.clone())?;
self.map_mmio_regions().map_err(|e| {
MigratableError::Restore(anyhow!(
"Could not map MMIO regions for VfioPciDevice on restore {:?}",
e
))
})?;
}
Ok(())

27
pci/src/vfio_user.rs
View File

@ -8,6 +8,7 @@ use crate::{BarReprogrammingParams, PciBarConfiguration, VfioPciError};
use crate::{
PciBdf, PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType, PciSubclass,
};
use anyhow::anyhow;
use hypervisor::HypervisorVmError;
use std::any::Any;
use std::os::unix::prelude::AsRawFd;
@ -34,6 +35,7 @@ pub struct VfioUserPciDevice {
vm: Arc<dyn hypervisor::Vm>,
client: Arc<Mutex<Client>>,
common: VfioCommon,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
}
#[derive(Error, Debug)]
@ -62,6 +64,7 @@ impl PciSubclass for PciVfioUserSubclass {
}
impl VfioUserPciDevice {
#[allow(clippy::too_many_arguments)]
pub fn new(
id: String,
vm: &Arc<dyn hypervisor::Vm>,
@ -70,6 +73,7 @@ impl VfioUserPciDevice {
legacy_interrupt_group: Option<Arc<dyn InterruptSourceGroup>>,
bdf: PciBdf,
restoring: bool,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
) -> Result<Self, VfioUserPciDeviceError> {
// This is used for the BAR and capabilities only
let configuration = PciConfiguration::new(
@ -125,17 +129,11 @@ impl VfioUserPciDevice {
vm: vm.clone(),
client,
common,
memory_slot,
})
}
pub fn map_mmio_regions<F>(
&mut self,
vm: &Arc<dyn hypervisor::Vm>,
mem_slot: F,
) -> Result<(), VfioUserPciDeviceError>
where
F: Fn() -> u32,
{
pub fn map_mmio_regions(&mut self) -> Result<(), VfioUserPciDeviceError> {
for mmio_region in &mut self.common.mmio_regions {
let region_flags = self
.client
@ -202,7 +200,7 @@ impl VfioUserPciDevice {
}
let user_memory_region = UserMemoryRegion {
slot: mem_slot(),
slot: (self.memory_slot)(),
start: mmio_region.start.0 + s.offset,
size: s.size,
host_addr: host_addr as u64,
@ -210,7 +208,7 @@ impl VfioUserPciDevice {
mmio_region.user_memory_regions.push(user_memory_region);
let mem_region = vm.make_user_memory_region(
let mem_region = self.vm.make_user_memory_region(
user_memory_region.slot,
user_memory_region.start,
user_memory_region.size,
@ -219,7 +217,8 @@ impl VfioUserPciDevice {
false,
);
vm.create_user_memory_region(mem_region)
self.vm
.create_user_memory_region(mem_region)
.map_err(VfioUserPciDeviceError::MapRegionGuest)?;
}
}
@ -578,6 +577,12 @@ impl Snapshottable for VfioUserPciDevice {
// Restore VfioCommon
if let Some(vfio_common_snapshot) = snapshot.snapshots.get(&self.common.id()) {
self.common.restore(*vfio_common_snapshot.clone())?;
self.map_mmio_regions().map_err(|e| {
MigratableError::Restore(anyhow!(
"Could not map MMIO regions for VfioUserPciDevice on restore {:?}",
e
))
})?;
}
Ok(())

45
vmm/src/device_manager.rs
View File

@ -16,8 +16,7 @@ use crate::config::{
use crate::device_tree::{DeviceNode, DeviceTree};
use crate::interrupt::LegacyUserspaceInterruptManager;
use crate::interrupt::MsiInterruptManager;
use crate::memory_manager::MEMORY_MANAGER_ACPI_SIZE;
use crate::memory_manager::{Error as MemoryManagerError, MemoryManager};
use crate::memory_manager::{Error as MemoryManagerError, MemoryManager, MEMORY_MANAGER_ACPI_SIZE};
use crate::pci_segment::PciSegment;
use crate::seccomp_filters::{get_seccomp_filter, Thread};
use crate::serial_manager::{Error as SerialManagerError, SerialManager};
@ -3074,6 +3073,8 @@ impl DeviceManager {
None
};
let memory_manager = self.memory_manager.clone();
let vfio_pci_device = VfioPciDevice::new(
vfio_name.clone(),
&self.address_manager.vm,
@ -3084,6 +3085,7 @@ impl DeviceManager {
device_cfg.iommu,
pci_device_bdf,
self.restoring,
Arc::new(move || memory_manager.lock().unwrap().allocate_memory_slot()),
)
.map_err(DeviceManagerError::VfioPciCreate)?;
@ -3097,13 +3099,15 @@ impl DeviceManager {
resources,
)?;
vfio_pci_device
.lock()
.unwrap()
.map_mmio_regions(&self.address_manager.vm, || {
self.memory_manager.lock().unwrap().allocate_memory_slot()
})
.map_err(DeviceManagerError::VfioMapRegion)?;
// When restoring a VM, the restore codepath will take care of mapping
// the MMIO regions based on the information from the snapshot.
if !self.restoring {
vfio_pci_device
.lock()
.unwrap()
.map_mmio_regions()
.map_err(DeviceManagerError::VfioMapRegion)?;
}
let mut node = device_node!(vfio_name, vfio_pci_device);
@ -3230,6 +3234,8 @@ impl DeviceManager {
.map_err(DeviceManagerError::VfioUserCreateClient)?,
));
let memory_manager = self.memory_manager.clone();
let mut vfio_user_pci_device = VfioUserPciDevice::new(
vfio_user_name.clone(),
&self.address_manager.vm,
@ -3238,6 +3244,7 @@ impl DeviceManager {
legacy_interrupt_group,
pci_device_bdf,
self.restoring,
Arc::new(move || memory_manager.lock().unwrap().allocate_memory_slot()),
)
.map_err(DeviceManagerError::VfioUserCreate)?;
@ -3272,15 +3279,17 @@ impl DeviceManager {
resources,
)?;
// Note it is required to call 'add_pci_device()' in advance to have the list of
// mmio regions provisioned correctly
vfio_user_pci_device
.lock()
.unwrap()
.map_mmio_regions(&self.address_manager.vm, || {
self.memory_manager.lock().unwrap().allocate_memory_slot()
})
.map_err(DeviceManagerError::VfioUserMapRegion)?;
// When restoring a VM, the restore codepath will take care of mapping
// the MMIO regions based on the information from the snapshot.
if !self.restoring {
// Note it is required to call 'add_pci_device()' in advance to have the list of
// mmio regions provisioned correctly
vfio_user_pci_device
.lock()
.unwrap()
.map_mmio_regions()
.map_err(DeviceManagerError::VfioUserMapRegion)?;
}
let mut node = device_node!(vfio_user_name, vfio_user_pci_device);