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target/i386: kvm: Add support for save and restore nested state

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Kernel commit 8fcc4b5923af ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE")
introduced new IOCTLs to extract and restore vCPU state related to
Intel VMX & AMD SVM.

Utilize these IOCTLs to add support for migration of VMs which are
running nested hypervisors.

Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Maran Wilson <maran.wilson@oracle.com>
Tested-by: Maran Wilson <maran.wilson@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20190619162140.133674-9-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2019-06-19 19:21:38 +03:00 • committed by Paolo Bonzini
parent 6cfd763932
commit ebbfef2f34
5 changed files with 290 additions and 0 deletions
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8
accel/kvm/kvm-all.c
View file

@ -87,6 +87,7 @@ struct KVMState
#ifdef KVM_CAP_SET_GUEST_DEBUG
QTAILQ_HEAD(, kvm_sw_breakpoint) kvm_sw_breakpoints;
#endif
int max_nested_state_len;
int many_ioeventfds;
int intx_set_mask;
bool sync_mmu;
@ -1681,6 +1682,8 @@ static int kvm_init(MachineState *ms)
s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
#endif
s->max_nested_state_len = kvm_check_extension(s, KVM_CAP_NESTED_STATE);
#ifdef KVM_CAP_IRQ_ROUTING
kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
#endif
@ -2248,6 +2251,11 @@ int kvm_has_debugregs(void)
return kvm_state->debugregs;
}
int kvm_max_nested_state_length(void)
{
return kvm_state->max_nested_state_len;
}
int kvm_has_many_ioeventfds(void)
{
if (!kvm_enabled()) {