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arch: aarch64: Implement ITS Snapshottable trait

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This commit implements the GicV3Its Snapshottable trait, including:

- GicV3Its state: GIC registers and ITS registers
- Save/restore logic of GicV3Its state

Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit is contained in:
Henry Wang 2021-06-30 18:24:01 +08:00 committed by Sebastien Boeuf
parent 4440671739
commit 6dcf9f6588
1 changed files with 305 additions and 9 deletions
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314
arch/src/aarch64/gic/gicv3_its.rs
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@ -4,15 +4,88 @@
// This file implements the GicV3 device with ITS (Virtual Interrupt Translation Service).
pub mod kvm {
use std::any::Any;
use std::sync::Arc;
use std::{boxed::Box, result};
type Result<T> = result::Result<T, Error>;
use crate::aarch64::gic::dist_regs::{get_dist_regs, read_ctlr, set_dist_regs, write_ctlr};
use crate::aarch64::gic::icc_regs::{get_icc_regs, set_icc_regs};
use crate::aarch64::gic::redist_regs::{
construct_gicr_typers, get_redist_regs, set_redist_regs,
};
use crate::aarch64::gic::gicv3::kvm::KvmGicV3;
use crate::aarch64::gic::kvm::KvmGicDevice;
use crate::aarch64::gic::{Error, GicDevice};
use crate::aarch64::gic::kvm::{save_pending_tables, KvmGicDevice};
use crate::aarch64::gic::GicDevice;
use anyhow::anyhow;
use hypervisor::kvm::kvm_bindings;
use hypervisor::CpuState;
use std::any::Any;
use std::convert::TryInto;
use std::sync::Arc;
use std::{boxed::Box, result};
use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize;
use vm_migration::{
Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable,
VersionMapped,
};
const GITS_CTLR: u32 = 0x0000;
const GITS_IIDR: u32 = 0x0004;
const GITS_CBASER: u32 = 0x0080;
const GITS_CWRITER: u32 = 0x0088;
const GITS_CREADR: u32 = 0x0090;
const GITS_BASER: u32 = 0x0100;
/// Errors thrown while saving/restoring the GICv3ITS.
#[derive(Debug)]
pub enum Error {
/// Error in saving RDIST pending tables into guest RAM.
SavePendingTables(crate::aarch64::gic::Error),
/// Error in saving GIC distributor registers.
SaveDistributorRegisters(crate::aarch64::gic::Error),
/// Error in restoring GIC distributor registers.
RestoreDistributorRegisters(crate::aarch64::gic::Error),
/// Error in saving GIC distributor control registers.
SaveDistributorCtrlRegisters(crate::aarch64::gic::Error),
/// Error in restoring GIC distributor control registers.
RestoreDistributorCtrlRegisters(crate::aarch64::gic::Error),
/// Error in saving GIC redistributor registers.
SaveRedistributorRegisters(crate::aarch64::gic::Error),
/// Error in restoring GIC redistributor registers.
RestoreRedistributorRegisters(crate::aarch64::gic::Error),
/// Error in saving GIC CPU interface registers.
SaveIccRegisters(crate::aarch64::gic::Error),
/// Error in restoring GIC CPU interface registers.
RestoreIccRegisters(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS IIDR register.
SaveITSIIDR(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS IIDR register.
RestoreITSIIDR(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS CBASER register.
SaveITSCBASER(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS CBASER register.
RestoreITSCBASER(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS CREADR register.
SaveITSCREADR(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS CREADR register.
RestoreITSCREADR(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS CWRITER register.
SaveITSCWRITER(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS CWRITER register.
RestoreITSCWRITER(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS BASER register.
SaveITSBASER(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS BASER register.
RestoreITSBASER(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS CTLR register.
SaveITSCTLR(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS CTLR register.
RestoreITSCTLR(crate::aarch64::gic::Error),
/// Error in saving GICv3ITS restore tables.
SaveITSTables(crate::aarch64::gic::Error),
/// Error in restoring GICv3ITS restore tables.
RestoreITSTables(crate::aarch64::gic::Error),
}
type Result<T> = result::Result<T, Error>;
/// Access an ITS device attribute.
///
@ -75,6 +148,9 @@ pub mod kvm {
/// The hypervisor agnostic device for the Its device
its_device: Option<Arc<dyn hypervisor::Device>>,
/// Vector holding values of GICR_TYPER for each vCPU
gicr_typers: Vec<u64>,
/// GIC device properties, to be used for setting up the fdt entry
gic_properties: [u64; 4],
@ -85,6 +161,23 @@ pub mod kvm {
vcpu_count: u64,
}
#[derive(Versionize)]
pub struct Gicv3ItsState {
dist: Vec<u32>,
rdist: Vec<u32>,
icc: Vec<u32>,
// special register that enables interrupts and affinity routing
gicd_ctlr: u32,
its_ctlr: u64,
its_iidr: u64,
its_cbaser: u64,
its_cwriter: u64,
its_creadr: u64,
its_baser: [u64; 8],
}
impl VersionMapped for Gicv3ItsState {}
impl KvmGicV3Its {
const KVM_VGIC_V3_ITS_SIZE: u64 = (2 * KvmGicV3::SZ_64K);
@ -95,6 +188,181 @@ pub mod kvm {
fn get_msi_addr(vcpu_count: u64) -> u64 {
KvmGicV3::get_redists_addr(vcpu_count) - KvmGicV3Its::get_msi_size()
}
/// Save the state of GICv3ITS.
fn state(&self, gicr_typers: &[u64]) -> Result<Gicv3ItsState> {
// Flush redistributors pending tables to guest RAM.
save_pending_tables(self.device()).map_err(Error::SavePendingTables)?;
let gicd_ctlr =
read_ctlr(self.device()).map_err(Error::SaveDistributorCtrlRegisters)?;
let dist_state =
get_dist_regs(self.device()).map_err(Error::SaveDistributorRegisters)?;
let rdist_state = get_redist_regs(self.device(), gicr_typers)
.map_err(Error::SaveRedistributorRegisters)?;
let icc_state =
get_icc_regs(self.device(), gicr_typers).map_err(Error::SaveIccRegisters)?;
// Save GICv3ITS registers
gicv3_its_tables_access(self.its_device().unwrap(), true)
.map_err(Error::SaveITSTables)?;
let its_baser_state: [u64; 8] = [0; 8];
for i in 0..8 {
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_BASER + i * 8,
&its_baser_state[i as usize],
false,
)
.map_err(Error::SaveITSBASER)?;
}
let its_ctlr_state: u64 = 0;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CTLR,
&its_ctlr_state,
false,
)
.map_err(Error::SaveITSCTLR)?;
let its_cbaser_state: u64 = 0;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CBASER,
&its_cbaser_state,
false,
)
.map_err(Error::SaveITSCBASER)?;
let its_creadr_state: u64 = 0;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CREADR,
&its_creadr_state,
false,
)
.map_err(Error::SaveITSCREADR)?;
let its_cwriter_state: u64 = 0;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CWRITER,
&its_cwriter_state,
false,
)
.map_err(Error::SaveITSCWRITER)?;
let its_iidr_state: u64 = 0;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_IIDR,
&its_iidr_state,
false,
)
.map_err(Error::SaveITSIIDR)?;
Ok(Gicv3ItsState {
dist: dist_state,
rdist: rdist_state,
icc: icc_state,
gicd_ctlr,
its_ctlr: its_ctlr_state,
its_iidr: its_iidr_state,
its_cbaser: its_cbaser_state,
its_cwriter: its_cwriter_state,
its_creadr: its_creadr_state,
its_baser: its_baser_state,
})
}
/// Restore the state of GICv3ITS.
fn set_state(&mut self, gicr_typers: &[u64], state: &Gicv3ItsState) -> Result<()> {
write_ctlr(self.device(), state.gicd_ctlr)
.map_err(Error::RestoreDistributorCtrlRegisters)?;
set_dist_regs(self.device(), &state.dist)
.map_err(Error::RestoreDistributorRegisters)?;
set_redist_regs(self.device(), gicr_typers, &state.rdist)
.map_err(Error::RestoreRedistributorRegisters)?;
set_icc_regs(self.device(), gicr_typers, &state.icc)
.map_err(Error::RestoreIccRegisters)?;
//Restore GICv3ITS registers
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_IIDR,
&state.its_iidr,
true,
)
.map_err(Error::RestoreITSIIDR)?;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CBASER,
&state.its_cbaser,
true,
)
.map_err(Error::RestoreITSCBASER)?;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CREADR,
&state.its_creadr,
true,
)
.map_err(Error::RestoreITSCREADR)?;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CWRITER,
&state.its_cwriter,
true,
)
.map_err(Error::RestoreITSCWRITER)?;
for i in 0..8 {
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_BASER + i * 8,
&state.its_baser[i as usize],
true,
)
.map_err(Error::RestoreITSBASER)?;
}
// Restore ITS tables
gicv3_its_tables_access(self.its_device().unwrap(), false)
.map_err(Error::RestoreITSTables)?;
gicv3_its_attr_access(
self.its_device().unwrap(),
kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
GITS_CTLR,
&state.its_ctlr,
true,
)
.map_err(Error::RestoreITSCTLR)?;
Ok(())
}
}
impl GicDevice for KvmGicV3Its {
@ -138,7 +406,10 @@ pub mod kvm {
self.its_device = its_device;
}
fn set_gicr_typers(&mut self, _vcpu_states: &[CpuState]) {}
fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]) {
let gicr_typers = construct_gicr_typers(vcpu_states);
self.gicr_typers = gicr_typers;
}
fn as_any_concrete_mut(&mut self) -> &mut dyn Any {
self
@ -157,6 +428,7 @@ pub mod kvm {
Box::new(KvmGicV3Its {
device,
its_device: None,
gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
gic_properties: [
KvmGicV3::get_dist_addr(),
KvmGicV3::get_dist_size(),
@ -174,7 +446,7 @@ pub mod kvm {
fn init_device_attributes(
vm: &Arc<dyn hypervisor::Vm>,
gic_device: &mut dyn GicDevice,
) -> Result<()> {
) -> crate::aarch64::gic::Result<()> {
KvmGicV3::init_device_attributes(vm, gic_device)?;
let mut its_device = kvm_bindings::kvm_create_device {
@ -185,7 +457,7 @@ pub mod kvm {
let its_fd = vm
.create_device(&mut its_device)
.map_err(Error::CreateGic)?;
.map_err(crate::aarch64::gic::Error::CreateGic)?;
Self::set_device_attribute(
&its_fd,
@ -208,4 +480,28 @@ pub mod kvm {
Ok(())
}
}
pub const GIC_V3_ITS_SNAPSHOT_ID: &str = "gic-v3-its";
impl Snapshottable for KvmGicV3Its {
fn id(&self) -> String {
GIC_V3_ITS_SNAPSHOT_ID.to_string()
}
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
let gicr_typers = self.gicr_typers.clone();
Snapshot::new_from_versioned_state(&self.id(), &self.state(&gicr_typers).unwrap())
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
let gicr_typers = self.gicr_typers.clone();
self.set_state(&gicr_typers, &snapshot.to_versioned_state(&self.id())?)
.map_err(|e| {
MigratableError::Restore(anyhow!("Could not restore GICv3ITS state {:?}", e))
})
}
}
impl Pausable for KvmGicV3Its {}
impl Transportable for KvmGicV3Its {}
impl Migratable for KvmGicV3Its {}
}