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[Qemu-devel] [QEMU PATCH v4 10/10] target/i386: kvm: Add nested migratio
From: |
Liran Alon |
Subject: |
[Qemu-devel] [QEMU PATCH v4 10/10] target/i386: kvm: Add nested migration blocker only when kernel lacks required capabilities |
Date: |
Wed, 19 Jun 2019 19:21:40 +0300 |
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 <address@hidden>
---
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);
}
- 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() <= 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);
--
2.20.1
- Re: [Qemu-devel] [QEMU PATCH v4 01/10] target/i386: kvm: Delete VMX migration blocker on vCPU init failure, (continued)
- [Qemu-devel] [QEMU PATCH v4 07/10] vmstate: Add support for kernel integer types, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 03/10] target/i386: kvm: Use symbolic constant for #DB/#BP exception constants, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 06/10] linux-headers: i386: Modify struct kvm_nested_state to have explicit fields for data, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 04/10] target/i386: kvm: Re-inject #DB to guest with updated DR6, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 05/10] target/i386: kvm: Block migration for vCPUs exposed with nested virtualization, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 08/10] target/i386: kvm: Add support for save and restore nested state, Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 02/10] KVM: Introduce kvm_arch_destroy_vcpu(), Liran Alon, 2019/06/19
- [Qemu-devel] [QEMU PATCH v4 10/10] target/i386: kvm: Add nested migration blocker only when kernel lacks required capabilities,
Liran Alon <=
- [Qemu-devel] [QEMU PATCH v4 09/10] target/i386: kvm: Add support for KVM_CAP_EXCEPTION_PAYLOAD, Liran Alon, 2019/06/19
- Re: [Qemu-devel] [QEMU PATCH v4 0/10]: target/i386: kvm: Add support for save and restore of nested state, Paolo Bonzini, 2019/06/20