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vm-device: Initial Migratable trait

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The Migratable trait groups all expected capabilities of devices and
components that can be migrated.

For a component to be migrated, it must be able to pause and resume.
Once paused, it should be able to provide a snapshot of itself. It
should also be able to restore itself from a snaphot.

As a consequence, the Migratable trait will be split between the
Pausable and the Snapshotable traits. This commit only adds the
Pausable one.

All migratable devices will be tracked from the DeviceManager.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2019-11-18 15:30:54 +01:00
parent 36daf9c0b0
commit 0361df4ae0
3 changed files with 71 additions and 0 deletions
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33
Cargo.lock generated
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@ -23,6 +23,11 @@ dependencies = [
"winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "anyhow"
version = "1.0.23"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "arc-swap"
version = "0.4.4"
@ -925,6 +930,24 @@ dependencies = [
"unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "thiserror"
version = "1.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"thiserror-impl 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "thiserror-impl"
version = "1.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "thread_local"
version = "0.3.6"
@ -1044,6 +1067,13 @@ dependencies = [
[[package]]
name = "vm-device"
version = "0.1.0"
dependencies = [
"anyhow 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_derive 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
"thiserror 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "vm-memory"
@ -1167,6 +1197,7 @@ dependencies = [
[metadata]
"checksum aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "81ce3d38065e618af2d7b77e10c5ad9a069859b4be3c2250f674af3840d9c8a5"
"checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
"checksum anyhow 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)" = "6f1072d8f55592084072d2d3cb23a4b680a8543c00f10d446118e85ad3718142"
"checksum arc-swap 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d7b8a9123b8027467bce0099fe556c628a53c8d83df0507084c31e9ba2e39aff"
"checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
"checksum arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
@ -1262,6 +1293,8 @@ dependencies = [
"checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
"checksum term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "fa63644f74ce96fbeb9b794f66aff2a52d601cbd5e80f4b97123e3899f4570f1"
"checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
"checksum thiserror 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "cc6b305ec0e323c7b6cfff6098a22516e0063d0bb7c3d88660a890217dca099a"
"checksum thiserror-impl 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "45ba8d810d9c48fc456b7ad54574e8bfb7c7918a57ad7a6e6a0985d7959e8597"
"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
"checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
"checksum unicode-xid 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "36dff09cafb4ec7c8cf0023eb0b686cb6ce65499116a12201c9e11840ca01beb"

5
vm-device/Cargo.toml
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@ -5,3 +5,8 @@ authors = ["The Cloud Hypervisor Authors"]
edition = "2018"
[dependencies]
anyhow = "1.0"
thiserror = "1.0"
serde = {version = ">=1.0.27", features = ["rc"] }
serde_derive = ">=1.0.27"
serde_json = ">=1.0.9"

33
vm-device/src/lib.rs
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@ -1,3 +1,8 @@
extern crate serde;
extern crate thiserror;
use thiserror::Error;
/// Trait meant for triggering the DMA mapping update related to an external
/// device not managed fully through virtio. It is dedicated to virtio-iommu
/// in order to trigger the map update anytime the mapping is updated from the
@ -9,3 +14,31 @@ pub trait ExternalDmaMapping: Send + Sync {
/// Unmap a memory range
fn unmap(&self, iova: u64, size: u64) -> std::result::Result<(), std::io::Error>;
}
#[derive(Error, Debug)]
pub enum MigratableError {
#[error("Failed to pause migratable component: {0}")]
Pause(#[source] anyhow::Error),
#[error("Failed to resume migratable component: {0}")]
Resume(#[source] anyhow::Error),
}
/// A Pausable component can be paused and resumed.
pub trait Pausable {
/// Pause the component.
fn pause(&mut self) -> std::result::Result<(), MigratableError>;
/// Resume the component.
fn resume(&mut self) -> std::result::Result<(), MigratableError>;
}
/// A snapshotable component can be snapshoted.
pub trait Snapshotable {}
/// Trait to be implemented by any component (device, CPU, RAM, etc) that
/// can be migrated.
/// All migratable components are paused before being snapshotted, and then
/// eventually resumed. Thus any Migratable component must be both Pausable
/// and Snapshotable.
pub trait Migratable: Pausable + Snapshotable {}