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    Subject[PATCH 2/8] SVM: add detection of Nested Paging feature
    Date
    Let SVM detect if the Nested Paging feature is available on the hardware.
    Disable it to keep this patch series bisectable.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kvm/svm.c | 8 ++++++++
    1 files changed, 8 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 0c58527..49bb57a 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -47,6 +47,8 @@ MODULE_LICENSE("GPL");
    #define SVM_FEATURE_LBRV (1 << 1)
    #define SVM_DEATURE_SVML (1 << 2)

    +static bool npt_enabled = false;
    +
    static void kvm_reput_irq(struct vcpu_svm *svm);

    static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
    @@ -410,6 +412,12 @@ static __init int svm_hardware_setup(void)

    svm_features = cpuid_edx(SVM_CPUID_FUNC);

    + if (!svm_has(SVM_FEATURE_NPT))
    + npt_enabled = false;
    +
    + if (npt_enabled)
    + printk(KERN_INFO "kvm: Nested Paging enabled\n");
    +
    return 0;

    err_2:
    --
    1.5.3.7




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