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target/i386: kvm: Add nested migration blocker only when kernel lacks required capabilities

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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 <liran.alon@oracle.com>
Reviewed-by: Maran Wilson <maran.wilson@oracle.com>
Message-Id: <20190619162140.133674-11-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2019-06-19 19:21:40 +03:00 committed by Paolo Bonzini
parent fd13f23b8c
commit 12604092e2
2 changed files with 8 additions and 3 deletions
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9
target/i386/kvm.c
View file

@ -1640,9 +1640,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
!!(c->ecx & CPUID_EXT_SMX);
}
if (cpu_has_nested_virt(env) && !nested_virt_mig_blocker) {
if (cpu_has_vmx(env) && !nested_virt_mig_blocker &&
((kvm_max_nested_state_length() <= 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=%d, CAP_EXCEPTION_PAYLOAD=%d)",
kvm_max_nested_state_length() > 0,
has_exception_payload);
r = migrate_add_blocker(nested_virt_mig_blocker, &local_err);
if (local_err) {
error_report_err(local_err);

2
target/i386/machine.c
View file

@ -233,7 +233,7 @@ static int cpu_pre_save(void *opaque)
#ifdef CONFIG_KVM
/* Verify we have nested virtualization state from kernel if required */
if (cpu_has_nested_virt(env) && !env->nested_state) {
if (kvm_enabled() && cpu_has_vmx(env) && !env->nested_state) {
error_report("Guest enabled nested virtualization but kernel "
"does not support saving of nested state");
return -EINVAL;