[PATCH v3 3/3] KVM: x86: Print guest pgd in kvm_nested_vmenter()

Mingwei Zhang
2022-08-08T00:36:21Z

Print guest pgd in kvm_nested_vmenter() to enrich the information for
tracing. When tdp is enabled, print the value of tdp page table (EPT/NPT);
when tdp is disabled, print the value of non-nested CR3.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
arch/x86/kvm/svm/nested.c | 2 ++
arch/x86/kvm/trace.h | 13 +++++++++----
arch/x86/kvm/vmx/nested.c | 2 ++
3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 0a148a352c3a..0b91a82a3755 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -730,6 +730,8 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
vmcb12->control.int_ctl,
vmcb12->control.event_inj,
vmcb12->control.nested_ctl,
+ vmcb12->control.nested_cr3,
+ vmcb12->save.cr3,
KVM_ISA_SVM);

trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 3ef29c7e4f69..821b3d254bb9 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -580,9 +580,10 @@ TRACE_EVENT(kvm_pv_eoi,
*/
TRACE_EVENT(kvm_nested_vmenter,
TP_PROTO(__u64 rip, __u64 vmcb, __u64 nested_rip, __u32 int_ctl,
- __u32 event_inj, bool tdp_enabled, __u32 isa),
+ __u32 event_inj, bool tdp_enabled, __u64 guest_tdp,
+ __u64 guest_cr3, __u32 isa),
TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, tdp_enabled,
- isa),
+ guest_tdp, guest_cr3, isa),

TP_STRUCT__entry(
__field( __u64, rip )
@@ -591,6 +592,7 @@ TRACE_EVENT(kvm_nested_vmenter,
__field( __u32, int_ctl )
__field( __u32, event_inj )
__field( bool, tdp_enabled )
+ __field( __u64, guest_pgd )
__field( __u32, isa )
),

@@ -601,11 +603,13 @@ TRACE_EVENT(kvm_nested_vmenter,
__entry->int_ctl = int_ctl;
__entry->event_inj = event_inj;
__entry->tdp_enabled = tdp_enabled;
+ __entry->guest_pgd = tdp_enabled ? guest_tdp : guest_cr3;
__entry->isa = isa;
),

TP_printk("rip: 0x%016llx %s: 0x%016llx nested_rip: 0x%016llx "
- "int_ctl: 0x%08x event_inj: 0x%08x nested_%s: %s",
+ "int_ctl: 0x%08x event_inj: 0x%08x nested_%s: %s, "
+ "guest_pgd: 0x%016llx",
__entry->rip,
__entry->isa == KVM_ISA_VMX ? "vmcs" : "vmcb",
__entry->vmcb,
@@ -613,7 +617,8 @@ TRACE_EVENT(kvm_nested_vmenter,
__entry->int_ctl,
__entry->event_inj,
__entry->isa == KVM_ISA_VMX ? "ept" : "npt",
- __entry->tdp_enabled ? "on" : "off")
+ __entry->tdp_enabled ? "on" : "off",
+ __entry->guest_pgd)
);

TRACE_EVENT(kvm_nested_intercepts,
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index a65477295ec0..4237b415e0f7 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3373,6 +3373,8 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
vmcs12->guest_intr_status,
vmcs12->vm_entry_intr_info_field,
vmcs12->secondary_vm_exec_control & SECONDARY_EXEC_ENABLE_EPT,
+ vmcs12->ept_pointer,
+ vmcs12->guest_cr3,
KVM_ISA_VMX);

kvm_service_local_tlb_flush_requests(vcpu);
--
2.37.1.559.g78731f0fdb-goog