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charset="utf-8" Previous commits have added support for migration of nested virtualization workloads. This was done by utilising two new KVM capabilities: KVM_CAP_NESTED_STATE and KVM_CAP_EXCEPTION_PAYLOAD. Both which are required in order to correctly migrate such workloads. Therefore, change code to add a migration blocker for vCPUs exposed with Intel VMX or AMD SVM in case one of these kernel capabilities is missing. Signed-off-by: Liran Alon Reviewed-by: Maran Wilson --- target/i386/kvm.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 99480a52ad33..a3d0fbed3b35 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -1313,9 +1313,14 @@ int kvm_arch_init_vcpu(CPUState *cs) !!(c->ecx & CPUID_EXT_SMX); } =20 - if (cpu_has_nested_virt(env) && !nested_virt_mig_blocker) { + if (cpu_has_nested_virt(env) && !nested_virt_mig_blocker && + ((kvm_max_nested_state_length() <=3D 0) || !has_exception_payload)= ) { error_setg(&nested_virt_mig_blocker, - "Nested virtualization does not support live migration = yet"); + "Kernel do not provide required capabilities for " + "nested virtualization migration. " + "(CAP_NESTED_STATE=3D%d, CAP_EXCEPTION_PAYLOAD=3D%d)", + kvm_max_nested_state_length() > 0, + has_exception_payload); r =3D migrate_add_blocker(nested_virt_mig_blocker, &local_err); if (local_err) { error_report_err(local_err); --=20 2.20.1