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target/i386: skip KVM_GET/SET_NESTED_STATE if VMX disabled, or for SVM

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Do not allocate env->nested_state unless we later need to migrate the
nested virtualization state.

With this change, nested_state_needed() will return false if the
VMX flag is not included in the virtual machine.  KVM_GET/SET_NESTED_STATE
is also disabled for SVM which is safer (we know that at least the NPT
root and paging mode have to be saved/loaded), and thus the corresponding
subsection can go away as well.

Inspired by a patch from Liran Alon.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-07-11 15:41:48 +02:00
parent 79a197ab18
commit 1e44f3ab71
2 changed files with 9 additions and 28 deletions
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21
target/i386/machine.c
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@ -1035,31 +1035,13 @@ static const VMStateDescription vmstate_vmx_nested_state = {
}
};
static bool svm_nested_state_needed(void *opaque)
{
struct kvm_nested_state *nested_state = opaque;
return (nested_state->format == KVM_STATE_NESTED_FORMAT_SVM);
}
static const VMStateDescription vmstate_svm_nested_state = {
.name = "cpu/kvm_nested_state/svm",
.version_id = 1,
.minimum_version_id = 1,
.needed = svm_nested_state_needed,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()
}
};
static bool nested_state_needed(void *opaque)
{
X86CPU *cpu = opaque;
CPUX86State *env = &cpu->env;
return (env->nested_state &&
(vmx_nested_state_needed(env->nested_state) ||
svm_nested_state_needed(env->nested_state)));
vmx_nested_state_needed(env->nested_state));
}
static int nested_state_post_load(void *opaque, int version_id)
@ -1121,7 +1103,6 @@ static const VMStateDescription vmstate_kvm_nested_state = {
},
.subsections = (const VMStateDescription*[]) {
&vmstate_vmx_nested_state,
&vmstate_svm_nested_state,
NULL
}
};