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    Subject[PATCH 24/27] KVM: SVM: Implement MMU helper functions for Nested Nested Paging
    Date
    This patch adds the helper functions which will be used in
    the mmu context for handling nested nested page faults.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kvm/svm.c | 32 ++++++++++++++++++++++++++++++++
    1 files changed, 32 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index a98ac52..6e72ba9 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -104,6 +104,8 @@ struct nested_state {
    u32 intercept_exceptions;
    u64 intercept;

    + /* Nested Paging related state */
    + u64 nested_cr3;
    };

    #define MSRPM_OFFSETS 16
    @@ -1600,6 +1602,36 @@ static int vmmcall_interception(struct vcpu_svm *svm)
    return 1;
    }

    +static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
    +{
    + struct vcpu_svm *svm = to_svm(vcpu);
    +
    + return svm->nested.nested_cr3;
    +}
    +
    +static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
    + unsigned long root)
    +{
    + struct vcpu_svm *svm = to_svm(vcpu);
    +
    + svm->vmcb->control.nested_cr3 = root;
    + force_new_asid(vcpu);
    +}
    +
    +static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
    + unsigned long addr,
    + u32 error_code)
    +{
    + struct vcpu_svm *svm = to_svm(vcpu);
    +
    + svm->vmcb->control.exit_code = SVM_EXIT_NPF;
    + svm->vmcb->control.exit_code_hi = 0;
    + svm->vmcb->control.exit_info_1 = error_code;
    + svm->vmcb->control.exit_info_2 = addr;
    +
    + nested_svm_vmexit(svm);
    +}
    +
    static int nested_svm_check_permissions(struct vcpu_svm *svm)
    {
    if (!(svm->vcpu.arch.efer & EFER_SVME)
    --
    1.7.0.4



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