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vmm: Ensure PIO/MMIO exits complete before pausing only for KVM

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MSHV does not require to ensure MMIO/PIO exits complete
before pausing. This patch makes sure the above requirement
by checking the hypervisor type run-time.

Fixes #5037

Signed-off-by: Muminul Islam <muislam@microsoft.com>
This commit is contained in:
Muminul Islam 2023-01-09 13:22:43 -08:00 committed by Rob Bradford
parent e661139e1e
commit 4e3bc20f2c
2 changed files with 10 additions and 6 deletions
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2
hypervisor/src/lib.rs
View File

@ -59,7 +59,7 @@ pub use vm::{
Vm, VmOps,
};
#[derive(Debug, Copy, Clone)]
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum HypervisorType {
#[cfg(feature = "kvm")]
Kvm,

14
vmm/src/cpu.rs
View File

@ -811,6 +811,8 @@ impl CpuManager {
) -> Result<()> {
let reset_evt = self.reset_evt.try_clone().unwrap();
let exit_evt = self.exit_evt.try_clone().unwrap();
#[cfg(feature = "kvm")]
let hypervisor_type = self.hypervisor_type;
#[cfg(feature = "guest_debug")]
let vm_debug_evt = self.vm_debug_evt.try_clone().unwrap();
let panic_exit_evt = self.exit_evt.try_clone().unwrap();
@ -919,12 +921,14 @@ impl CpuManager {
#[cfg(feature = "kvm")]
{
vcpu.lock().as_ref().unwrap().vcpu.set_immediate_exit(true);
if !matches!(vcpu.lock().unwrap().run(), Ok(VmExit::Ignore)) {
error!("Unexpected VM exit on \"immediate_exit\" run");
break;
if matches!(hypervisor_type, HypervisorType::Kvm) {
vcpu.lock().as_ref().unwrap().vcpu.set_immediate_exit(true);
if !matches!(vcpu.lock().unwrap().run(), Ok(VmExit::Ignore)) {
error!("Unexpected VM exit on \"immediate_exit\" run");
break;
}
vcpu.lock().as_ref().unwrap().vcpu.set_immediate_exit(false);
}
vcpu.lock().as_ref().unwrap().vcpu.set_immediate_exit(false);
}
vcpu_run_interrupted.store(true, Ordering::SeqCst);