On Fri, Sep 10, 2021 at 07:56:36AM +0000, Wang, Wei W wrote: > On Wednesday, August 4, 2021 8:00 PM, Ashish Kalra wrote: > > +/* > > + * Currently this exit is only used by SEV guests for > > + * MSR_KVM_MIGRATION_CONTROL to indicate if the guest > > + * is ready for migration. > > + */ > > +static int kvm_handle_x86_msr(X86CPU *cpu, struct kvm_run *run) { > > + static uint64_t msr_kvm_migration_control; > > + > > + if (run->msr.index != MSR_KVM_MIGRATION_CONTROL) { > > + run->msr.error = -EINVAL; > > + return -1; > > + } > > + > > + switch (run->exit_reason) { > > + case KVM_EXIT_X86_RDMSR: > > + run->msr.error = 0; > > + run->msr.data = msr_kvm_migration_control; > > + break; > > + case KVM_EXIT_X86_WRMSR: > > + msr_kvm_migration_control = run->msr.data; > > + if (run->msr.data == KVM_MIGRATION_READY) { > > + sev_del_migrate_blocker(); > > It seems this is enabled/disabled by the guest, which means that the guest > can always refuse to be migrated? >
Yes. Are there any specific concerns/issues with that ? Thanks, Ashish