KVM: nSVM: cancel KVM_REQ_GET_NESTED_STATE_PAGES on nested vmexit

commit f2c7ef3ba9556d62a7e2bb23b563c6510007d55c upstream.

It is possible to exit the nested guest mode, entered by
svm_set_nested_state prior to first vm entry to it (e.g due to pending event)
if the nested run was not pending during the migration.

In this case we must not switch to the nested msr permission bitmap.
Also add a warning to catch similar cases in the future.

Fixes: a7d5c7ce41ac1 ("KVM: nSVM: delay MSR permission processing to first nested VM run")

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210107093854.882483-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 9e4c226..a037742 100644 (file)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -199,6 +199,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
 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 =
@@ -595,6 +596,8 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
        svm->nested.vmcb12_gpa = 0;
        WARN_ON_ONCE(svm->nested.nested_run_pending);
 
+       kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu);
+
        /* in case we halted in L2 */
        svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
 

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 89af692..e542f03 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4416,6 +4416,8 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
        /* trying to cancel vmlaunch/vmresume is a bug */
        WARN_ON_ONCE(vmx->nested.nested_run_pending);
 
+       kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
+
        /* Service the TLB flush request for L2 before switching to L1. */
        if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu))
                kvm_vcpu_flush_tlb_current(vcpu);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e545a8a..582c270 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8750,7 +8750,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
        if (kvm_request_pending(vcpu)) {
                if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
-                       if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) {
+                       if (WARN_ON_ONCE(!is_guest_mode(vcpu)))
+                               ;
+                       else if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) {
                                r = 0;
                                goto out;
                        }