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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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devices: pvpanic: add snapshot support
Add PvPanicDeviceState to retore events of pvpanic from snapshot, and also PciConfigurationState. Signed-off-by: Yi Wang <foxywang@tencent.com>
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@ -3,16 +3,24 @@
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// SPDX-License-Identifier: Apache-2.0
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// SPDX-License-Identifier: Apache-2.0
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//
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//
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use anyhow::anyhow;
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use pci::{
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use pci::{
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BarReprogrammingParams, PciBarConfiguration, PciBarPrefetchable, PciBarRegionType,
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BarReprogrammingParams, PciBarConfiguration, PciBarPrefetchable, PciBarRegionType,
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PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType, PciSubclass,
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PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType, PciSubclass,
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PCI_CONFIGURATION_ID,
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};
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};
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use std::any::Any;
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use std::any::Any;
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use std::result;
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use std::result;
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use std::sync::{Arc, Barrier, Mutex};
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use std::sync::{Arc, Barrier, Mutex};
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use thiserror::Error;
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use versionize::{VersionMap, Versionize, VersionizeResult};
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use versionize_derive::Versionize;
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use vm_allocator::{AddressAllocator, SystemAllocator};
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use vm_allocator::{AddressAllocator, SystemAllocator};
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use vm_device::{BusDevice, Resource};
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use vm_device::{BusDevice, Resource};
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use vm_memory::{Address, GuestAddress};
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use vm_memory::{Address, GuestAddress};
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use vm_migration::{
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Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable, VersionMapped,
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};
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const PVPANIC_VENDOR_ID: u16 = 0x1b36;
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const PVPANIC_VENDOR_ID: u16 = 0x1b36;
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const PVPANIC_DEVICE_ID: u16 = 0x0011;
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const PVPANIC_DEVICE_ID: u16 = 0x0011;
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@ -22,6 +30,14 @@ pub const PVPANIC_DEVICE_MMIO_SIZE: u64 = 0x2;
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const PVPANIC_PANICKED: u8 = 1 << 0;
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const PVPANIC_PANICKED: u8 = 1 << 0;
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const PVPANIC_CRASH_LOADED: u8 = 1 << 1;
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const PVPANIC_CRASH_LOADED: u8 = 1 << 1;
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#[derive(Debug, Error)]
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pub enum PvPanicError {
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#[error("Failed creating PvPanicDevice: {0}")]
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CreatePvPanicDevice(#[source] anyhow::Error),
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#[error("Failed to retrieve PciConfigurationState: {0}")]
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RetrievePciConfigurationState(#[source] anyhow::Error),
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}
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#[allow(dead_code)]
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#[allow(dead_code)]
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#[derive(Copy, Clone)]
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#[derive(Copy, Clone)]
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pub enum PvPanicSubclass {
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pub enum PvPanicSubclass {
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@ -44,8 +60,24 @@ pub struct PvPanicDevice {
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bar_regions: Vec<PciBarConfiguration>,
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bar_regions: Vec<PciBarConfiguration>,
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}
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}
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#[derive(Versionize)]
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pub struct PvPanicDeviceState {
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events: u8,
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}
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impl VersionMapped for PvPanicDeviceState {}
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impl PvPanicDevice {
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impl PvPanicDevice {
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pub fn new(id: String) -> PvPanicDevice {
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pub fn new(id: String, snapshot: Option<Snapshot>) -> Result<Self, PvPanicError> {
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let pci_configuration_state =
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vm_migration::versioned_state_from_id(snapshot.as_ref(), PCI_CONFIGURATION_ID)
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.map_err(|e| {
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PvPanicError::RetrievePciConfigurationState(anyhow!(
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"Failed to get PciConfigurationState from Snapshot: {}",
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e
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))
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})?;
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let mut configuration = PciConfiguration::new(
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let mut configuration = PciConfiguration::new(
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PVPANIC_VENDOR_ID,
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PVPANIC_VENDOR_ID,
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PVPANIC_DEVICE_ID,
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PVPANIC_DEVICE_ID,
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@ -57,20 +89,36 @@ impl PvPanicDevice {
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0,
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0,
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0,
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0,
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None,
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None,
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None,
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pci_configuration_state,
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);
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);
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let command: [u8; 2] = [0x03, 0x01];
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let command: [u8; 2] = [0x03, 0x01];
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configuration.write_config_register(1, 0, &command);
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configuration.write_config_register(1, 0, &command);
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let events = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
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let state: Option<PvPanicDeviceState> = snapshot
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.as_ref()
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.map(|s| s.to_versioned_state())
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.transpose()
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.map_err(|e| {
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PvPanicError::CreatePvPanicDevice(anyhow!(
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"Failed to get PvPanicDeviceState from Snapshot: {}",
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e
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))
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})?;
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let events = if let Some(state) = state {
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state.events
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} else {
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PVPANIC_PANICKED | PVPANIC_CRASH_LOADED
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};
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PvPanicDevice {
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let pvpanic_device = PvPanicDevice {
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id,
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id,
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events,
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events,
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configuration,
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configuration,
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bar_regions: vec![],
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bar_regions: vec![],
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}
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};
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Ok(pvpanic_device)
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}
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}
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pub fn event_to_string(&self, event: u8) -> String {
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pub fn event_to_string(&self, event: u8) -> String {
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@ -82,6 +130,12 @@ impl PvPanicDevice {
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"unknown_event".to_string()
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"unknown_event".to_string()
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}
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}
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}
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}
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fn state(&self) -> PvPanicDeviceState {
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PvPanicDeviceState {
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events: self.events,
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}
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}
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}
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}
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impl BusDevice for PvPanicDevice {
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impl BusDevice for PvPanicDevice {
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@ -125,12 +179,13 @@ impl PciDevice for PvPanicDevice {
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&mut self,
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&mut self,
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allocator: &Arc<Mutex<SystemAllocator>>,
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allocator: &Arc<Mutex<SystemAllocator>>,
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_mmio_allocator: &mut AddressAllocator,
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_mmio_allocator: &mut AddressAllocator,
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_resources: Option<Vec<Resource>>,
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resources: Option<Vec<Resource>>,
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) -> std::result::Result<Vec<PciBarConfiguration>, PciDeviceError> {
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) -> std::result::Result<Vec<PciBarConfiguration>, PciDeviceError> {
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let mut bars = Vec::new();
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let mut bars = Vec::new();
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let region_type = PciBarRegionType::Memory32BitRegion;
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let region_type = PciBarRegionType::Memory32BitRegion;
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let bar_id = 0;
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let bar_id = 0;
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let region_size = PVPANIC_DEVICE_MMIO_SIZE;
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let region_size = PVPANIC_DEVICE_MMIO_SIZE;
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let restoring = resources.is_some();
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let bar_addr = allocator
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let bar_addr = allocator
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.lock()
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.lock()
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.unwrap()
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.unwrap()
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@ -145,9 +200,12 @@ impl PciDevice for PvPanicDevice {
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.set_prefetchable(PciBarPrefetchable::NotPrefetchable);
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.set_prefetchable(PciBarPrefetchable::NotPrefetchable);
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debug!("pvpanic bar address 0x{:x}", bar_addr.0);
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debug!("pvpanic bar address 0x{:x}", bar_addr.0);
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if !restoring {
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self.configuration
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self.configuration
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.add_pci_bar(&bar)
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.add_pci_bar(&bar)
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.map_err(|e| PciDeviceError::IoRegistrationFailed(bar_addr.raw_value(), e))?;
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.map_err(|e| PciDeviceError::IoRegistrationFailed(bar_addr.raw_value(), e))?;
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}
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bars.push(bar);
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bars.push(bar);
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self.bar_regions = bars.clone();
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self.bar_regions = bars.clone();
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@ -188,3 +246,23 @@ impl PciDevice for PvPanicDevice {
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Some(self.id.clone())
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Some(self.id.clone())
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}
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}
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}
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}
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impl Pausable for PvPanicDevice {}
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impl Snapshottable for PvPanicDevice {
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fn id(&self) -> String {
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self.id.clone()
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}
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fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
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let mut snapshot = Snapshot::new_from_versioned_state(&self.state())?;
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// Snapshot PciConfiguration
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snapshot.add_snapshot(self.configuration.id(), self.configuration.snapshot()?);
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Ok(snapshot)
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}
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}
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impl Transportable for PvPanicDevice {}
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impl Migratable for PvPanicDevice {}
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