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From a99cae3466f0fae8a46c58f4e07ed6b6a481a0a5 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 22 Jul 2019 18:22:17 +0100
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Subject: [PATCH 36/39] target/i386: kvm: Add nested migration blocker only
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when kernel lacks required capabilities
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20190722182220.19374-16-pbonzini@redhat.com>
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Patchwork-id: 89632
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O-Subject: [RHEL-8.1.0 PATCH qemu-kvm v3 15/18] target/i386: kvm: Add nested migration blocker only when kernel lacks required capabilities
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Bugzilla: 1689269
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RH-Acked-by: Peter Xu <zhexu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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From: Liran Alon <liran.alon@oracle.com>
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Previous commits have added support for migration of nested virtualization
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workloads. This was done by utilising two new KVM capabilities:
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KVM_CAP_NESTED_STATE and KVM_CAP_EXCEPTION_PAYLOAD. Both which are
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required in order to correctly migrate such workloads.
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Therefore, change code to add a migration blocker for vCPUs exposed with
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Intel VMX or AMD SVM in case one of these kernel capabilities is
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missing.
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Signed-off-by: Liran Alon <liran.alon@oracle.com>
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Reviewed-by: Maran Wilson <maran.wilson@oracle.com>
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Message-Id: <20190619162140.133674-11-liran.alon@oracle.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 12604092e26cdace44c901bc429e7e4c7c3e0cab)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/kvm.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index aa2d589..0619aba 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -1159,9 +1159,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
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!!(c->ecx & CPUID_EXT_SMX);
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}
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- if (cpu_has_vmx(env) && !nested_virt_mig_blocker) {
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+ if (cpu_has_vmx(env) && !nested_virt_mig_blocker &&
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+ ((kvm_max_nested_state_length() <= 0) || !has_exception_payload)) {
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error_setg(&nested_virt_mig_blocker,
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- "Nested virtualization does not support live migration yet");
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+ "Kernel do not provide required capabilities for "
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+ "nested virtualization migration. "
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+ "(CAP_NESTED_STATE=%d, CAP_EXCEPTION_PAYLOAD=%d)",
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+ kvm_max_nested_state_length() > 0,
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+ has_exception_payload);
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r = migrate_add_blocker(nested_virt_mig_blocker, &local_err);
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if (local_err) {
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error_report_err(local_err);
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--
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1.8.3.1
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