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hypervisor: Re-order vCPU state for storing and restoring

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Some vCPU states such as MP_STATE can be modified while retrieving
other states. For this reason, it's important to follow a specific
order that will ensure a state won't be modified after it has been
saved. Comments about ordering requirements have been copied over
from Firecracker commit 57f4c7ca14a31c5536f188cacb669d2cad32b9ca.

This patch also set the previously saved VCPU_EVENTS, as this was
missing from the restore codepath.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-06-24 16:52:41 +02:00
committed by Rob Bradford
parent 2b8accf49a
commit e2b5c78dc5
3 changed files with 82 additions and 23 deletions
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11
hypervisor/src/cpu.rs
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@@ -125,6 +125,11 @@ pub enum HypervisorCpuError {
#[error("Failed to get Vcpu events: {0}")]
GetVcpuEvents(#[source] anyhow::Error),
///
/// Setting Vcpu events error
///
#[error("Failed to set Vcpu events: {0}")]
SetVcpuEvents(#[source] anyhow::Error),
///
/// Vcpu Init error
///
#[error("Failed to init vcpu: {0}")]
@@ -255,6 +260,12 @@ pub trait Vcpu: Send + Sync {
fn get_vcpu_events(&self) -> Result<VcpuEvents>;
#[cfg(target_arch = "x86_64")]
///
/// Sets pending exceptions, interrupts, and NMIs as well as related states
/// of the vcpu.
///
fn set_vcpu_events(&self, events: &VcpuEvents) -> Result<()>;
#[cfg(target_arch = "x86_64")]
///
/// Let the guest know that it has been paused, which prevents from
/// potential soft lockups when being resumed.
///