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vmm: Only generate GED interrupt when the number of vCPUs has changed

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Avoid activity in the the guest OS if the number of vCPUs has not
changed.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-01-17 16:48:46 +00:00 committed by Samuel Ortiz
parent 8049666eff
commit 211786ab42
2 changed files with 12 additions and 9 deletions
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8
vmm/src/cpu.rs
View File

@ -661,11 +661,11 @@ impl CpuManager {
self.activate_vcpus(self.boot_vcpus(), Some(entry_addr)) self.activate_vcpus(self.boot_vcpus(), Some(entry_addr))
} }
pub fn resize(&mut self, desired_vcpus: u8) -> Result<()> { pub fn resize(&mut self, desired_vcpus: u8) -> Result<bool> {
match desired_vcpus.cmp(&self.present_vcpus()) { match desired_vcpus.cmp(&self.present_vcpus()) {
cmp::Ordering::Greater => self.activate_vcpus(desired_vcpus, None), cmp::Ordering::Greater => self.activate_vcpus(desired_vcpus, None).and(Ok(true)),
cmp::Ordering::Less => self.mark_vcpus_for_removal(desired_vcpus), cmp::Ordering::Less => self.mark_vcpus_for_removal(desired_vcpus).and(Ok(true)),
_ => Ok(()), _ => Ok(false),
} }
} }

13
vmm/src/vm.rs
View File

@ -485,14 +485,17 @@ impl Vm {
pub fn resize(&mut self, desired_vcpus: Option<u8>, desired_memory: Option<u64>) -> Result<()> { pub fn resize(&mut self, desired_vcpus: Option<u8>, desired_memory: Option<u64>) -> Result<()> {
if let Some(desired_vcpus) = desired_vcpus { if let Some(desired_vcpus) = desired_vcpus {
self.cpu_manager if self
.cpu_manager
.lock() .lock()
.unwrap() .unwrap()
.resize(desired_vcpus) .resize(desired_vcpus)
.map_err(Error::CpuManager)?; .map_err(Error::CpuManager)?
self.devices {
.notify_hotplug(HotPlugNotificationFlags::CPU_DEVICES_CHANGED) self.devices
.map_err(Error::DeviceManager)?; .notify_hotplug(HotPlugNotificationFlags::CPU_DEVICES_CHANGED)
.map_err(Error::DeviceManager)?;
}
self.config.lock().unwrap().cpus.boot_vcpus = desired_vcpus; self.config.lock().unwrap().cpus.boot_vcpus = desired_vcpus;
} }