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    Subject[RFC Part2 PATCH v3 23/26] KVM: X86: Add memory encryption enabled ops
    Date
    Extend kvm_x86_ops to add memory_encyption_enabled() ops. It returns a
    boolean indicating whether memory encryption is enabled on the VCPU.

    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    ---
    arch/x86/include/asm/kvm_host.h | 1 +
    arch/x86/kvm/svm.c | 8 ++++++++
    2 files changed, 9 insertions(+)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index a91aadf..a14d4dd 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -1073,6 +1073,7 @@ struct kvm_x86_ops {
    struct kvm_memory_encrypt_ram *ram);
    int (*memory_encryption_unregister_ram)(struct kvm *kvm,
    struct kvm_memory_encrypt_ram *ram);
    + bool (*memory_encryption_enabled)(struct kvm_vcpu *vcpu);
    };

    struct kvm_arch_async_pf {
    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index cdb1cf3..0bbd050 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -6548,6 +6548,12 @@ static int mem_encrypt_unregister_ram(struct kvm *kvm,
    return 0;
    }

    +static bool mem_encrypt_enabled(struct kvm_vcpu *vcpu)
    +{
    + return !!(to_svm(vcpu)->vmcb->control.nested_ctl &
    + SVM_NESTED_CTL_SEV_ENABLE);
    +}
    +
    static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
    .cpu_has_kvm_support = has_svm,
    .disabled_by_bios = is_disabled,
    @@ -6664,6 +6670,8 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
    .memory_encryption_op = svm_memory_encryption_op,
    .memory_encryption_register_ram = mem_encrypt_register_ram,
    .memory_encryption_unregister_ram = mem_encrypt_unregister_ram,
    + .memory_encryption_enabled = mem_encrypt_enabled,
    +
    };

    static int __init svm_init(void)
    --
    2.9.4
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