Haiwei Li <lihaiwei.kernel@xxxxxxxxx> writes:
> From: Haiwei Li <lihaiwei@xxxxxxxxxxx>
>
> Add trace_kvm_cr_write and trace_kvm_cr_read for svm.
>
> Signed-off-by: Haiwei Li <lihaiwei@xxxxxxxxxxx>
> ---
> arch/x86/kvm/svm/svm.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 03dd7bac8034..2c6dea48ba62 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -2261,6 +2261,7 @@ static int cr_interception(struct vcpu_svm *svm)
There are two special cases when we go to emulate_on_interception() and
these won't be logged but I don't think this is a must.
> if (cr >= 16) { /* mov to cr */
> cr -= 16;
> val = kvm_register_read(&svm->vcpu, reg);
> + trace_kvm_cr_write(cr, val);
> switch (cr) {
> case 0:
> if (!check_selective_cr0_intercepted(svm, val))
> @@ -2306,6 +2307,7 @@ static int cr_interception(struct vcpu_svm *svm)
> return 1;
> }
> kvm_register_write(&svm->vcpu, reg, val);
> + trace_kvm_cr_read(cr, val);
The 'default:' case above does 'return 1;' so we won't get the trace but
I understand you put trace_kvm_cr_read() here so you can log the
returned 'val', #UD should be clearly visible.
> }
> return kvm_complete_insn_gp(&svm->vcpu, err);
> }
> --
> 2.18.4
>
Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
--
Vitaly
