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pci, vmm: Move VfioPciDevice and VfioUserPciDevice to new restore design

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Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-11-28 15:12:18 +01:00
parent 1eac37bd5f
commit cc3706afe1
3 changed files with 97 additions and 120 deletions
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159
pci/src/vfio.rs
View File

@ -3,11 +3,13 @@
// SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
//
use crate::msi::{MsiConfigState, MSI_CONFIG_ID};
use crate::msix::MsixConfigState;
use crate::{
msi_num_enabled_vectors, BarReprogrammingParams, MsiCap, MsiConfig, MsixCap, MsixConfig,
PciBarConfiguration, PciBarPrefetchable, PciBarRegionType, PciBdf, PciCapabilityId,
PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciExpressCapabilityId,
PciHeaderType, PciSubclass, MSIX_TABLE_ENTRY_SIZE,
PciHeaderType, PciSubclass, MSIX_CONFIG_ID, MSIX_TABLE_ENTRY_SIZE, PCI_CONFIGURATION_ID,
};
use anyhow::anyhow;
use byteorder::{ByteOrder, LittleEndian};
@ -36,6 +38,8 @@ use vm_migration::{
};
use vmm_sys_util::eventfd::EventFd;
pub(crate) const VFIO_COMMON_ID: &str = "vfio_common";
#[derive(Debug, Error)]
pub enum VfioPciError {
#[error("Failed to create user memory region: {0}")]
@ -58,6 +62,14 @@ pub enum VfioPciError {
RegionAlignment,
#[error("Invalid region size")]
RegionSize,
#[error("Failed to retrieve MsiConfigState: {0}")]
RetrieveMsiConfigState(#[source] anyhow::Error),
#[error("Failed to retrieve MsixConfigState: {0}")]
RetrieveMsixConfigState(#[source] anyhow::Error),
#[error("Failed to retrieve PciConfigurationState: {0}")]
RetrievePciConfigurationState(#[source] anyhow::Error),
#[error("Failed to retrieve VfioCommonState: {0}")]
RetrieveVfioCommonState(#[source] anyhow::Error),
}
#[derive(Copy, Clone)]
@ -412,8 +424,17 @@ impl VfioCommon {
vfio_wrapper: Arc<dyn Vfio>,
subclass: &dyn PciSubclass,
bdf: PciBdf,
restoring: bool,
snapshot: Option<Snapshot>,
) -> Result<Self, VfioPciError> {
let pci_configuration_state =
vm_migration::versioned_state_from_id(snapshot.as_ref(), PCI_CONFIGURATION_ID)
.map_err(|e| {
VfioPciError::RetrievePciConfigurationState(anyhow!(
"Failed to get PciConfigurationState from Snapshot: {}",
e
))
})?;
let configuration = PciConfiguration::new(
0,
0,
@ -425,7 +446,7 @@ impl VfioCommon {
0,
0,
None,
None,
pci_configuration_state,
);
let mut vfio_common = VfioCommon {
@ -442,10 +463,34 @@ impl VfioCommon {
patches: HashMap::new(),
};
// No need to parse capabilities from the device if on the restore path.
// The initialization will be performed later when restore() will be
// called.
if !restoring {
let state: Option<VfioCommonState> = snapshot
.as_ref()
.map(|s| s.to_versioned_state(VFIO_COMMON_ID))
.transpose()
.map_err(|e| {
VfioPciError::RetrieveVfioCommonState(anyhow!(
"Failed to get VfioCommonState from Snapshot: {}",
e
))
})?;
let msi_state = vm_migration::versioned_state_from_id(snapshot.as_ref(), MSI_CONFIG_ID)
.map_err(|e| {
VfioPciError::RetrieveMsiConfigState(anyhow!(
"Failed to get MsiConfigState from Snapshot: {}",
e
))
})?;
let msix_state = vm_migration::versioned_state_from_id(snapshot.as_ref(), MSIX_CONFIG_ID)
.map_err(|e| {
VfioPciError::RetrieveMsixConfigState(anyhow!(
"Failed to get MsixConfigState from Snapshot: {}",
e
))
})?;
if let Some(state) = state.as_ref() {
vfio_common.set_state(state, msi_state, msix_state)?;
} else {
vfio_common.parse_capabilities(bdf);
vfio_common.initialize_legacy_interrupt()?;
}
@ -697,7 +742,13 @@ impl VfioCommon {
}
}
pub(crate) fn initialize_msix(&mut self, msix_cap: MsixCap, cap_offset: u32, bdf: PciBdf) {
pub(crate) fn initialize_msix(
&mut self,
msix_cap: MsixCap,
cap_offset: u32,
bdf: PciBdf,
state: Option<MsixConfigState>,
) {
let interrupt_source_group = self
.msi_interrupt_manager
.create_group(MsiIrqGroupConfig {
@ -710,7 +761,7 @@ impl VfioCommon {
msix_cap.table_size(),
interrupt_source_group.clone(),
bdf.into(),
None,
state,
)
.unwrap();
@ -726,7 +777,12 @@ impl VfioCommon {
self.vfio_wrapper.read_config_word((cap + 2).into())
}
pub(crate) fn initialize_msi(&mut self, msg_ctl: u16, cap_offset: u32) {
pub(crate) fn initialize_msi(
&mut self,
msg_ctl: u16,
cap_offset: u32,
state: Option<MsiConfigState>,
) {
let interrupt_source_group = self
.msi_interrupt_manager
.create_group(MsiIrqGroupConfig {
@ -735,7 +791,7 @@ impl VfioCommon {
})
.unwrap();
let msi_config = MsiConfig::new(msg_ctl, interrupt_source_group.clone(), None).unwrap();
let msi_config = MsiConfig::new(msg_ctl, interrupt_source_group.clone(), state).unwrap();
self.interrupt.msi = Some(VfioMsi {
cfg: msi_config,
@ -762,7 +818,7 @@ impl VfioCommon {
// Parse capability only if the VFIO device
// supports MSI.
let msg_ctl = self.parse_msi_capabilities(cap_next);
self.initialize_msi(msg_ctl, cap_next as u32);
self.initialize_msi(msg_ctl, cap_next as u32, None);
}
}
}
@ -773,7 +829,7 @@ impl VfioCommon {
// Parse capability only if the VFIO device
// supports MSI-X.
let msix_cap = self.parse_msix_capabilities(cap_next);
self.initialize_msix(msix_cap, cap_next as u32, bdf);
self.initialize_msix(msix_cap, cap_next as u32, bdf, None);
}
}
}
@ -1140,7 +1196,12 @@ impl VfioCommon {
}
}
fn set_state(&mut self, state: &VfioCommonState) -> Result<(), VfioPciError> {
fn set_state(
&mut self,
state: &VfioCommonState,
msi_state: Option<MsiConfigState>,
msix_state: Option<MsixConfigState>,
) -> Result<(), VfioPciError> {
if let (Some(intx), Some(interrupt_source_group)) =
(&state.intx_state, self.legacy_interrupt_group.clone())
{
@ -1155,11 +1216,11 @@ impl VfioCommon {
}
if let Some(msi) = &state.msi_state {
self.initialize_msi(msi.cap.msg_ctl, msi.cap_offset);
self.initialize_msi(msi.cap.msg_ctl, msi.cap_offset, msi_state);
}
if let Some(msix) = &state.msix_state {
self.initialize_msix(msix.cap, msix.cap_offset, msix.bdf.into());
self.initialize_msix(msix.cap, msix.cap_offset, msix.bdf.into(), msix_state);
}
Ok(())
@ -1170,7 +1231,7 @@ impl Pausable for VfioCommon {}
impl Snapshottable for VfioCommon {
fn id(&self) -> String {
String::from("vfio_common")
String::from(VFIO_COMMON_ID)
}
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
@ -1192,51 +1253,6 @@ impl Snapshottable for VfioCommon {
Ok(vfio_common_snapshot)
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
if let Some(vfio_common_section) = snapshot
.snapshot_data
.get(&format!("{}-section", self.id()))
{
// It has to be invoked first as we want Interrupt to be initialized
// correctly before we try to restore MSI and MSI-X configurations.
self.set_state(&vfio_common_section.to_versioned_state()?)
.map_err(|e| {
MigratableError::Restore(anyhow!("Could not restore VFIO_COMMON state {:?}", e))
})?;
// Restore PciConfiguration
if let Some(pci_config_snapshot) = snapshot.snapshots.get(&self.configuration.id()) {
self.configuration.restore(*pci_config_snapshot.clone())?;
}
// Restore MSI
if let Some(msi) = &mut self.interrupt.msi {
if let Some(msi_snapshot) = snapshot.snapshots.get(&msi.cfg.id()) {
msi.cfg.restore(*msi_snapshot.clone())?;
}
if msi.cfg.enabled() {
self.enable_msi().unwrap();
}
}
// Restore MSI-X
if let Some(msix) = &mut self.interrupt.msix {
if let Some(msix_snapshot) = snapshot.snapshots.get(&msix.bar.id()) {
msix.bar.restore(*msix_snapshot.clone())?;
}
if msix.bar.enabled() {
self.enable_msix().unwrap();
}
}
return Ok(());
}
Err(MigratableError::Restore(anyhow!(
"Could not find VFIO_COMMON snapshot section"
)))
}
}
/// VfioPciDevice represents a VFIO PCI device.
@ -1267,8 +1283,8 @@ impl VfioPciDevice {
legacy_interrupt_group: Option<Arc<dyn InterruptSourceGroup>>,
iommu_attached: bool,
bdf: PciBdf,
restoring: bool,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
snapshot: Option<Snapshot>,
) -> Result<Self, VfioPciError> {
let device = Arc::new(device);
device.reset();
@ -1281,7 +1297,7 @@ impl VfioPciDevice {
Arc::new(vfio_wrapper) as Arc<dyn Vfio>,
&PciVfioSubclass::VfioSubclass,
bdf,
restoring,
vm_migration::snapshot_from_id(snapshot.as_ref(), VFIO_COMMON_ID),
)?;
let vfio_pci_device = VfioPciDevice {
@ -1731,21 +1747,6 @@ impl Snapshottable for VfioPciDevice {
Ok(vfio_pci_dev_snapshot)
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
// 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(())
}
}
impl Transportable for VfioPciDevice {}
impl Migratable for VfioPciDevice {}

22
pci/src/vfio_user.rs
View File

@ -3,10 +3,9 @@
// SPDX-License-Identifier: Apache-2.0
//
use crate::vfio::{UserMemoryRegion, Vfio, VfioCommon, VfioError};
use crate::vfio::{UserMemoryRegion, Vfio, VfioCommon, VfioError, VFIO_COMMON_ID};
use crate::{BarReprogrammingParams, PciBarConfiguration, VfioPciError};
use crate::{PciBdf, PciDevice, PciDeviceError, PciSubclass};
use anyhow::anyhow;
use hypervisor::HypervisorVmError;
use std::any::Any;
use std::os::unix::prelude::AsRawFd;
@ -72,8 +71,8 @@ impl VfioUserPciDevice {
msi_interrupt_manager: Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
legacy_interrupt_group: Option<Arc<dyn InterruptSourceGroup>>,
bdf: PciBdf,
restoring: bool,
memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
snapshot: Option<Snapshot>,
) -> Result<Self, VfioUserPciDeviceError> {
let resettable = client.lock().unwrap().resettable();
if resettable {
@ -94,7 +93,7 @@ impl VfioUserPciDevice {
Arc::new(vfio_wrapper) as Arc<dyn Vfio>,
&PciVfioUserSubclass::VfioUserSubclass,
bdf,
restoring,
vm_migration::snapshot_from_id(snapshot.as_ref(), VFIO_COMMON_ID),
)
.map_err(VfioUserPciDeviceError::CreateVfioCommon)?;
@ -543,21 +542,6 @@ impl Snapshottable for VfioUserPciDevice {
Ok(vfio_pci_dev_snapshot)
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
// 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(())
}
}
impl Transportable for VfioUserPciDevice {}
impl Migratable for VfioUserPciDevice {}

12
vmm/src/device_manager.rs
View File

@ -3182,8 +3182,8 @@ impl DeviceManager {
legacy_interrupt_group,
device_cfg.iommu,
pci_device_bdf,
self.restoring,
Arc::new(move || memory_manager.lock().unwrap().allocate_memory_slot()),
vm_migration::snapshot_from_id(self.snapshot.as_ref(), vfio_name.as_str()),
)
.map_err(DeviceManagerError::VfioPciCreate)?;
@ -3197,15 +3197,11 @@ impl DeviceManager {
resources,
)?;
// 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);
@ -3341,8 +3337,8 @@ impl DeviceManager {
self.msi_interrupt_manager.clone(),
legacy_interrupt_group,
pci_device_bdf,
self.restoring,
Arc::new(move || memory_manager.lock().unwrap().allocate_memory_slot()),
vm_migration::snapshot_from_id(self.snapshot.as_ref(), vfio_user_name.as_str()),
)
.map_err(DeviceManagerError::VfioUserCreate)?;
@ -3377,9 +3373,6 @@ impl DeviceManager {
resources,
)?;
// 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
@ -3387,7 +3380,6 @@ impl DeviceManager {
.unwrap()
.map_mmio_regions()
.map_err(DeviceManagerError::VfioUserMapRegion)?;
}
let mut node = device_node!(vfio_user_name, vfio_user_pci_device);