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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id e16sm7404844edr.86.2021.07.06.07.23.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jul 2021 07:23:06 -0700 (PDT) Subject: Re: [RFC PATCH v2 67/69] KVM: TDX: add trace point for TDVMCALL and SEPT operation To: isaku.yamahata@intel.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , erdemaktas@google.com, Connor Kuehl , Sean Christopherson , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: isaku.yamahata@gmail.com, Yuan Yao References: <0fc6ab7acf3ac2e764ada5abd76500ce8adb3d33.1625186503.git.isaku.yamahata@intel.com> From: Paolo Bonzini Message-ID: Date: Tue, 6 Jul 2021 16:23:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <0fc6ab7acf3ac2e764ada5abd76500ce8adb3d33.1625186503.git.isaku.yamahata@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/07/21 00:05, isaku.yamahata@intel.com wrote: > From: Isaku Yamahata > > Signed-off-by: Yuan Yao > Signed-off-by: Isaku Yamahata > --- > arch/x86/kvm/trace.h | 58 +++++++++++++++++++++++++++++++++++++ > arch/x86/kvm/vmx/tdx.c | 16 ++++++++++ > arch/x86/kvm/vmx/tdx_arch.h | 9 ++++++ > arch/x86/kvm/x86.c | 2 ++ > 4 files changed, 85 insertions(+) > > diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h > index c3398d0de9a7..58631124f08d 100644 > --- a/arch/x86/kvm/trace.h > +++ b/arch/x86/kvm/trace.h > @@ -739,6 +739,64 @@ TRACE_EVENT(kvm_tdx_seamcall_exit, > __entry->r9, __entry->r10, __entry->r11) > ); > > +/* > + * Tracepoint for TDVMCALL from a TDX guest > + */ > +TRACE_EVENT(kvm_tdvmcall, > + TP_PROTO(struct kvm_vcpu *vcpu, __u32 exit_reason, > + __u64 p1, __u64 p2, __u64 p3, __u64 p4), > + TP_ARGS(vcpu, exit_reason, p1, p2, p3, p4), > + > + TP_STRUCT__entry( > + __field( __u64, rip ) > + __field( __u32, exit_reason ) > + __field( __u64, p1 ) > + __field( __u64, p2 ) > + __field( __u64, p3 ) > + __field( __u64, p4 ) > + ), > + > + TP_fast_assign( > + __entry->rip = kvm_rip_read(vcpu); > + __entry->exit_reason = exit_reason; > + __entry->p1 = p1; > + __entry->p2 = p2; > + __entry->p3 = p3; > + __entry->p4 = p4; > + ), > + > + TP_printk("rip: %llx reason: %s p1: %llx p2: %llx p3: %llx p4: %llx", > + __entry->rip, > + __print_symbolic(__entry->exit_reason, > + TDG_VP_VMCALL_EXIT_REASONS), > + __entry->p1, __entry->p2, __entry->p3, __entry->p4) > +); > + > +/* > + * Tracepoint for SEPT related SEAMCALLs. > + */ > +TRACE_EVENT(kvm_sept_seamcall, > + TP_PROTO(__u64 op, __u64 gpa, __u64 hpa, int level), > + TP_ARGS(op, gpa, hpa, level), > + > + TP_STRUCT__entry( > + __field( __u64, op ) > + __field( __u64, gpa ) > + __field( __u64, hpa ) > + __field( int, level ) > + ), > + > + TP_fast_assign( > + __entry->op = op; > + __entry->gpa = gpa; > + __entry->hpa = hpa; > + __entry->level = level; > + ), > + > + TP_printk("op: %llu gpa: 0x%llx hpa: 0x%llx level: %u", > + __entry->op, __entry->gpa, __entry->hpa, __entry->level) > +); > + > /* > * Tracepoint for nested #vmexit because of interrupt pending > */ > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > index 1aed4286ce0c..63130fb5a003 100644 > --- a/arch/x86/kvm/vmx/tdx.c > +++ b/arch/x86/kvm/vmx/tdx.c > @@ -934,6 +934,10 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) > > exit_reason = tdvmcall_exit_reason(vcpu); > > + trace_kvm_tdvmcall(vcpu, exit_reason, > + tdvmcall_p1_read(vcpu), tdvmcall_p2_read(vcpu), > + tdvmcall_p3_read(vcpu), tdvmcall_p4_read(vcpu)); > + > switch (exit_reason) { > case EXIT_REASON_CPUID: > return tdx_emulate_cpuid(vcpu); > @@ -1011,11 +1015,15 @@ static void tdx_sept_set_private_spte(struct kvm_vcpu *vcpu, gfn_t gfn, > > /* Build-time faults are induced and handled via TDH_MEM_PAGE_ADD. */ > if (is_td_finalized(kvm_tdx)) { > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_PAGE_AUG, gpa, hpa, level); > + > err = tdh_mem_page_aug(kvm_tdx->tdr.pa, gpa, hpa, &ex_ret); > SEPT_ERR(err, &ex_ret, TDH_MEM_PAGE_AUG, vcpu->kvm); > return; > } > > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_PAGE_ADD, gpa, hpa, level); > + > source_pa = kvm_tdx->source_pa & ~KVM_TDX_MEASURE_MEMORY_REGION; > > err = tdh_mem_page_add(kvm_tdx->tdr.pa, gpa, hpa, source_pa, &ex_ret); > @@ -1039,6 +1047,8 @@ static void tdx_sept_drop_private_spte(struct kvm *kvm, gfn_t gfn, int level, > return; > > if (is_hkid_assigned(kvm_tdx)) { > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_PAGE_REMOVE, gpa, hpa, level); > + > err = tdh_mem_page_remove(kvm_tdx->tdr.pa, gpa, level, &ex_ret); > if (SEPT_ERR(err, &ex_ret, TDH_MEM_PAGE_REMOVE, kvm)) > return; > @@ -1063,6 +1073,8 @@ static int tdx_sept_link_private_sp(struct kvm_vcpu *vcpu, gfn_t gfn, > struct tdx_ex_ret ex_ret; > u64 err; > > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_SEPT_ADD, gpa, hpa, level); > + > err = tdh_mem_spet_add(kvm_tdx->tdr.pa, gpa, level, hpa, &ex_ret); > if (SEPT_ERR(err, &ex_ret, TDH_MEM_SEPT_ADD, vcpu->kvm)) > return -EIO; > @@ -1077,6 +1089,8 @@ static void tdx_sept_zap_private_spte(struct kvm *kvm, gfn_t gfn, int level) > struct tdx_ex_ret ex_ret; > u64 err; > > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_RANGE_BLOCK, gpa, -1ull, level); > + > err = tdh_mem_range_block(kvm_tdx->tdr.pa, gpa, level, &ex_ret); > SEPT_ERR(err, &ex_ret, TDH_MEM_RANGE_BLOCK, kvm); > } > @@ -1088,6 +1102,8 @@ static void tdx_sept_unzap_private_spte(struct kvm *kvm, gfn_t gfn, int level) > struct tdx_ex_ret ex_ret; > u64 err; > > + trace_kvm_sept_seamcall(SEAMCALL_TDH_MEM_RANGE_UNBLOCK, gpa, -1ull, level); > + > err = tdh_mem_range_unblock(kvm_tdx->tdr.pa, gpa, level, &ex_ret); > SEPT_ERR(err, &ex_ret, TDH_MEM_RANGE_UNBLOCK, kvm); > } > diff --git a/arch/x86/kvm/vmx/tdx_arch.h b/arch/x86/kvm/vmx/tdx_arch.h > index 7258825b1e02..414b933a3b03 100644 > --- a/arch/x86/kvm/vmx/tdx_arch.h > +++ b/arch/x86/kvm/vmx/tdx_arch.h > @@ -104,6 +104,15 @@ > #define TDG_VP_VMCALL_REPORT_FATAL_ERROR 0x10003 > #define TDG_VP_VMCALL_SETUP_EVENT_NOTIFY_INTERRUPT 0x10004 > > +#define TDG_VP_VMCALL_EXIT_REASONS \ > + { TDG_VP_VMCALL_GET_TD_VM_CALL_INFO, \ > + "GET_TD_VM_CALL_INFO" }, \ > + { TDG_VP_VMCALL_MAP_GPA, "MAP_GPA" }, \ > + { TDG_VP_VMCALL_GET_QUOTE, "GET_QUOTE" }, \ > + { TDG_VP_VMCALL_SETUP_EVENT_NOTIFY_INTERRUPT, \ > + "SETUP_EVENT_NOTIFY_INTERRUPT" }, \ > + VMX_EXIT_REASONS > + > /* TDX control structure (TDR/TDCS/TDVPS) field access codes */ > #define TDX_CLASS_SHIFT 56 > #define TDX_FIELD_MASK GENMASK_ULL(31, 0) > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index ba69abcc663a..ad619c1b2a88 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -12104,6 +12104,8 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); > +EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_tdvmcall); > +EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_sept_seamcall); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed); > EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); > Please split this in two parts for each tracepoint, and squash it in the earlier patches that introduced handle_tdvmcall and tdx_sept_*. Paolo