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KVM: nSVM: delay MSR permission processing to first nested VM run

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Allow userspace to set up the memory map after KVM_SET_NESTED_STATE;
to do so, move the call to nested_svm_vmrun_msrpm inside the
KVM_REQ_GET_NESTED_STATE_PAGES handler (which is currently
not used by nSVM).  This is similar to what VMX does already.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-09-22 07:43:14 -04:00
parent 729c15c20f
commit a7d5c7ce41
1 changed files with 18 additions and 3 deletions
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21
arch/x86/kvm/svm/nested.c
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@ -196,6 +196,20 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
return true;
}
static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (!nested_svm_vmrun_msrpm(svm)) {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror =
KVM_INTERNAL_ERROR_EMULATION;
vcpu->run->internal.ndata = 0;
return false;
}
return true;
}
static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
{
if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0)
@ -698,6 +712,8 @@ void svm_leave_nested(struct vcpu_svm *svm)
copy_vmcb_control_area(&vmcb->control, &hsave->control);
nested_svm_uninit_mmu_context(&svm->vcpu);
}
kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu);
}
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
@ -1142,9 +1158,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
load_nested_vmcb_control(svm, ctl);
nested_prepare_vmcb_control(svm);
if (!nested_svm_vmrun_msrpm(svm))
goto out_free;
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
ret = 0;
out_free:
kfree(save);
@ -1155,6 +1169,7 @@ out_free:
struct kvm_x86_nested_ops svm_nested_ops = {
.check_events = svm_check_nested_events,
.get_nested_state_pages = svm_get_nested_state_pages,
.get_state = svm_get_nested_state,
.set_state = svm_set_nested_state,
};