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hypervisor: Set destination vCPU TSC frequency to source

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Include the TSC frequency as part of the KVM state so that it will be
restored at the destination.

This ensures migration works correctly between hosts that have a
different TSC frequency if the guest is running with TSC as the source
of timekeeping.

Fixes: #5786

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
This commit is contained in:
Rob Bradford
2023-09-19 10:30:45 +01:00
committed by Bo Chen
parent 18d8c5669f
commit 44f200d67d
4 changed files with 39 additions and 0 deletions
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13
hypervisor/src/cpu.rs
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@@ -252,6 +252,11 @@ pub enum HypervisorCpuError {
///
#[error("Failed to get TSC frequency: {0}")]
GetTscKhz(#[source] anyhow::Error),
///
/// Error setting TSC frequency
///
#[error("Failed to set TSC frequency: {0}")]
SetTscKhz(#[source] anyhow::Error),
}
#[derive(Debug)]
@@ -447,6 +452,7 @@ pub trait Vcpu: Send + Sync {
/// Return the list of initial MSR entries for a VCPU
///
fn boot_msr_entries(&self) -> Vec<MsrEntry>;
#[cfg(target_arch = "x86_64")]
///
/// Get the frequency of the TSC if available
@@ -454,4 +460,11 @@ pub trait Vcpu: Send + Sync {
fn tsc_khz(&self) -> Result<Option<u32>> {
Ok(None)
}
#[cfg(target_arch = "x86_64")]
///
/// Set the frequency of the TSC if available
///
fn set_tsc_khz(&self, _freq: u32) -> Result<()> {
Ok(())
}
}