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    Subject[PATCH 06/40] KVM: SVM: Add VMLOAD and VMSAVE handlers
    Date
    From: Alexander Graf <agraf@suse.de>

    This implements the VMLOAD and VMSAVE instructions, that usually surround
    the VMRUN instructions. Both instructions load / restore the same elements,
    so we only need to implement them once.

    v2 fixes CPL checking and replaces memcpy by assignments
    v3 makes use of the new permission checking

    Acked-by: Joerg Roedel <joro@8bytes.org>
    Signed-off-by: Alexander Graf <agraf@suse.de>
    Signed-off-by: Avi Kivity <avi@redhat.com>
    ---
    arch/x86/kvm/svm.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 58 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 59aaff1..a83c94e 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -1243,6 +1243,62 @@ static int nested_svm_do(struct vcpu_svm *svm,
    return retval;
    }

    +static int nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
    +{
    + to_vmcb->save.fs = from_vmcb->save.fs;
    + to_vmcb->save.gs = from_vmcb->save.gs;
    + to_vmcb->save.tr = from_vmcb->save.tr;
    + to_vmcb->save.ldtr = from_vmcb->save.ldtr;
    + to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
    + to_vmcb->save.star = from_vmcb->save.star;
    + to_vmcb->save.lstar = from_vmcb->save.lstar;
    + to_vmcb->save.cstar = from_vmcb->save.cstar;
    + to_vmcb->save.sfmask = from_vmcb->save.sfmask;
    + to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
    + to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
    + to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
    +
    + return 1;
    +}
    +
    +static int nested_svm_vmload(struct vcpu_svm *svm, void *nested_vmcb,
    + void *arg2, void *opaque)
    +{
    + return nested_svm_vmloadsave((struct vmcb *)nested_vmcb, svm->vmcb);
    +}
    +
    +static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
    + void *arg2, void *opaque)
    +{
    + return nested_svm_vmloadsave(svm->vmcb, (struct vmcb *)nested_vmcb);
    +}
    +
    +static int vmload_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
    +{
    + if (nested_svm_check_permissions(svm))
    + return 1;
    +
    + svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
    + skip_emulated_instruction(&svm->vcpu);
    +
    + nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmload);
    +
    + return 1;
    +}
    +
    +static int vmsave_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
    +{
    + if (nested_svm_check_permissions(svm))
    + return 1;
    +
    + svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
    + skip_emulated_instruction(&svm->vcpu);
    +
    + nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmsave);
    +
    + return 1;
    +}
    +
    static int stgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
    {
    if (nested_svm_check_permissions(svm))
    @@ -1578,8 +1634,8 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
    [SVM_EXIT_SHUTDOWN] = shutdown_interception,
    [SVM_EXIT_VMRUN] = invalid_op_interception,
    [SVM_EXIT_VMMCALL] = vmmcall_interception,
    - [SVM_EXIT_VMLOAD] = invalid_op_interception,
    - [SVM_EXIT_VMSAVE] = invalid_op_interception,
    + [SVM_EXIT_VMLOAD] = vmload_interception,
    + [SVM_EXIT_VMSAVE] = vmsave_interception,
    [SVM_EXIT_STGI] = stgi_interception,
    [SVM_EXIT_CLGI] = clgi_interception,
    [SVM_EXIT_SKINIT] = invalid_op_interception,
    --
    1.6.0.6


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