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    Subject[PATCH 4.19 067/306] KVM: nVMX: move check_vmentry_postreqs() call to nested_vmx_enter_non_root_mode()
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    [ Upstream commit 7671ce21b13b9596163a29f4712cb2451a9b97dc ]

    In preparation of supporting checkpoint/restore for nested state,
    commit ca0bde28f2ed ("kvm: nVMX: Split VMCS checks from nested_vmx_run()")
    modified check_vmentry_postreqs() to only perform the guest EFER
    consistency checks when nested_run_pending is true. But, in the
    normal nested VMEntry flow, nested_run_pending is only set after
    check_vmentry_postreqs(), i.e. the consistency check is being skipped.

    Alternatively, nested_run_pending could be set prior to calling
    check_vmentry_postreqs() in nested_vmx_run(), but placing the
    consistency checks in nested_vmx_enter_non_root_mode() allows us
    to split prepare_vmcs02() and interleave the preparation with
    the consistency checks without having to change the call sites
    of nested_vmx_enter_non_root_mode(). In other words, the rest
    of the consistency check code in nested_vmx_run() will be joining
    the postreqs checks in future patches.

    Fixes: ca0bde28f2ed ("kvm: nVMX: Split VMCS checks from nested_vmx_run()")
    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Cc: Jim Mattson <jmattson@google.com>
    Reviewed-by: Jim Mattson <jmattson@google.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/x86/kvm/vmx.c | 10 +++-------
    1 file changed, 3 insertions(+), 7 deletions(-)

    diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
    index fe7fdd666f091..bdf019f322117 100644
    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -12694,6 +12694,9 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu, u32 *exit_qual)
    if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu))
    evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu);

    + if (from_vmentry && check_vmentry_postreqs(vcpu, vmcs12, exit_qual))
    + return EXIT_REASON_INVALID_STATE;
    +
    enter_guest_mode(vcpu);

    if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
    @@ -12836,13 +12839,6 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
    */
    skip_emulated_instruction(vcpu);

    - ret = check_vmentry_postreqs(vcpu, vmcs12, &exit_qual);
    - if (ret) {
    - nested_vmx_entry_failure(vcpu, vmcs12,
    - EXIT_REASON_INVALID_STATE, exit_qual);
    - return 1;
    - }
    -
    /*
    * We're finally done with prerequisite checking, and can start with
    * the nested entry.
    --
    2.20.1


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