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Add tracepoint for this on x86 kvm. > > Signed-off-by: Haiwei Li > --- > v1 -> v2: > * Improve the changelog > > arch/x86/kvm/svm/svm.c | 2 ++ > arch/x86/kvm/trace.h | 27 +++++++++++++++++++++++++++ > arch/x86/kvm/vmx/vmx.c | 10 ++++++++-- > arch/x86/kvm/x86.c | 1 + > 4 files changed, 38 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c > index 4f401fc6a05d..52c69551aea4 100644 > --- a/arch/x86/kvm/svm/svm.c > +++ b/arch/x86/kvm/svm/svm.c > @@ -2423,12 +2423,14 @@ static int dr_interception(struct vcpu_svm *svm) > if (!kvm_require_dr(&svm->vcpu, dr - 16)) > return 1; > val = kvm_register_read(&svm->vcpu, reg); > + trace_kvm_dr_write(dr - 16, val); > kvm_set_dr(&svm->vcpu, dr - 16, val); > } else { > if (!kvm_require_dr(&svm->vcpu, dr)) > return 1; > kvm_get_dr(&svm->vcpu, dr, &val); > kvm_register_write(&svm->vcpu, reg, val); > + trace_kvm_dr_read(dr, val); > } > > return kvm_skip_emulated_instruction(&svm->vcpu); > diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h > index aef960f90f26..b3bf54405862 100644 > --- a/arch/x86/kvm/trace.h > +++ b/arch/x86/kvm/trace.h > @@ -405,6 +405,33 @@ TRACE_EVENT(kvm_cr, > #define trace_kvm_cr_read(cr, val) trace_kvm_cr(0, cr, val) > #define trace_kvm_cr_write(cr, val) trace_kvm_cr(1, cr, val) > > +/* > + * Tracepoint for guest DR access. > + */ > +TRACE_EVENT(kvm_dr, > + TP_PROTO(unsigned int rw, unsigned int dr, unsigned long val), > + TP_ARGS(rw, dr, val), > + > + TP_STRUCT__entry( > + __field( unsigned int, rw ) > + __field( unsigned int, dr ) > + __field( unsigned long, val ) > + ), > + > + TP_fast_assign( > + __entry->rw = rw; > + __entry->dr = dr; > + __entry->val = val; > + ), > + > + TP_printk("dr_%s %x = 0x%lx", > + __entry->rw ? "write" : "read", > + __entry->dr, __entry->val) > +); > + > +#define trace_kvm_dr_read(dr, val) trace_kvm_dr(0, dr, val) > +#define trace_kvm_dr_write(dr, val) trace_kvm_dr(1, dr, val) > + > TRACE_EVENT(kvm_pic_set_irq, > TP_PROTO(__u8 chip, __u8 pin, __u8 elcr, __u8 imr, bool coalesced), > TP_ARGS(chip, pin, elcr, imr, coalesced), > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index 4551a7e80ebc..f78fd297d51e 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -5091,10 +5091,16 @@ static int handle_dr(struct kvm_vcpu *vcpu) > > if (kvm_get_dr(vcpu, dr, &val)) > return 1; > + trace_kvm_dr_read(dr, val); > kvm_register_write(vcpu, reg, val); > - } else > - if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg))) > + } else { > + unsigned long val; > + > + val = kvm_register_readl(vcpu, reg); > + trace_kvm_dr_write(dr, val); > + if (kvm_set_dr(vcpu, dr, val)) > return 1; > + } > > return kvm_skip_emulated_instruction(vcpu); > } > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index c4015a43cc8a..68cb7b331324 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -11153,6 +11153,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); > +EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_dr); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); >