Hi Sean, On 4/1/2024 10:45 PM, Sean Christopherson wrote: > On Mon, Apr 01, 2024, Manali Shukla wrote: >> Currently, all the VMs are created with in-kernel APIC support in KVM >> selftests because KVM_CREATE_IRQCHIP ioctl is called by default from >> kvm_arch_vm_post_create(). >> >> Carve out space in the @shape passed to the various VM creation helpers to >> allow using the shape to control creation of a VM without in-kernel APIC >> support or with in-kernel APIC support. >> >> This is a preparatory patch to create a vm without in-kernel APIC support for >> the KVM_X86_DISABLE_EXITS_HLT test. > > Ugh, when I suggested creating a VM without an in-kernel APIC as away to > easily > test that HLT doesn't exit, I wasn't thinking about the side effects of > creating > a runnable VM without an in-kernel APIC. The other downside is that > practically > no one uses a userspace local APIC these days, i.e. the selftest isn't a great > representation of real world setups. > > Given that KVM already provides vcpu->stat.halt_exits, using a stats FD for > verifying exiting behavior is probably a better option. The other check that > could be added would be to verify that mp_state is always RUNNABLE (which is a > bug/gap in KVM as migrating a vCPU that was halted in the guest won't resume > in > a halted state on the target). Sure. I will work on it.
- Manali
