--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only */
+#if !defined(LTTNG_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define LTTNG_TRACE_KVM_H
+
+#include <lttng/tracepoint-event.h>
+#include <asm/vmx.h>
+#include <asm/svm.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
+#include <asm/clocksource.h>
+#endif
+#include <linux/version.h>
+#include <../arch/x86/kvm/lapic.h>
+#include <../arch/x86/kvm/kvm_cache_regs.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm_x86
+
+/*
+ * Tracepoint for guest mode entry.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_entry, kvm_x86_entry,
+ TP_PROTO(unsigned int vcpu_id),
+ TP_ARGS(vcpu_id),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, vcpu_id, vcpu_id)
+ )
+)
+
+/*
+ * Tracepoint for hypercall.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_hypercall, kvm_x86_hypercall,
+ TP_PROTO(unsigned long nr, unsigned long a0, unsigned long a1,
+ unsigned long a2, unsigned long a3),
+ TP_ARGS(nr, a0, a1, a2, a3),
+
+ TP_FIELDS(
+ ctf_integer(unsigned long, nr, nr)
+ ctf_integer(unsigned long, a0, a0)
+ ctf_integer(unsigned long, a1, a1)
+ ctf_integer(unsigned long, a2, a2)
+ ctf_integer(unsigned long, a3, a3)
+ )
+)
+
+/*
+ * Tracepoint for hypercall.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_hv_hypercall, kvm_x86_hv_hypercall,
+ TP_PROTO(__u16 code, bool fast, __u16 rep_cnt, __u16 rep_idx,
+ __u64 ingpa, __u64 outgpa),
+ TP_ARGS(code, fast, rep_cnt, rep_idx, ingpa, outgpa),
+
+ TP_FIELDS(
+ ctf_integer(__u16, rep_cnt, rep_cnt)
+ ctf_integer(__u16, rep_idx, rep_idx)
+ ctf_integer(__u64, ingpa, ingpa)
+ ctf_integer(__u64, outgpa, outgpa)
+ ctf_integer(__u16, code, code)
+ ctf_integer(bool, fast, fast)
+ )
+)
+
+/*
+ * Tracepoint for PIO.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_pio, kvm_x86_pio,
+ TP_PROTO(unsigned int rw, unsigned int port, unsigned int size,
+ unsigned int count),
+ TP_ARGS(rw, port, size, count),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, rw, rw)
+ ctf_integer(unsigned int, port, port)
+ ctf_integer(unsigned int, size, size)
+ ctf_integer(unsigned int, count, count)
+ )
+)
+
+/*
+ * Tracepoint for cpuid.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_cpuid, kvm_x86_cpuid,
+ TP_PROTO(unsigned int function, unsigned long rax, unsigned long rbx,
+ unsigned long rcx, unsigned long rdx),
+ TP_ARGS(function, rax, rbx, rcx, rdx),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, function, function)
+ ctf_integer(unsigned long, rax, rax)
+ ctf_integer(unsigned long, rbx, rbx)
+ ctf_integer(unsigned long, rcx, rcx)
+ ctf_integer(unsigned long, rdx, rdx)
+ )
+)
+
+/*
+ * Tracepoint for apic access.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_apic, kvm_x86_apic,
+ TP_PROTO(unsigned int rw, unsigned int reg, unsigned int val),
+ TP_ARGS(rw, reg, val),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, rw, rw)
+ ctf_integer(unsigned int, reg, reg)
+ ctf_integer(unsigned int, val, val)
+ )
+)
+
+#define trace_kvm_apic_read(reg, val) trace_kvm_apic(0, reg, val)
+#define trace_kvm_apic_write(reg, val) trace_kvm_apic(1, reg, val)
+
+/*
+ * Tracepoint for kvm guest exit:
+ */
+LTTNG_TRACEPOINT_EVENT_CODE_MAP(kvm_exit, kvm_x86_exit,
+ TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu, u32 isa),
+ TP_ARGS(exit_reason, vcpu, isa),
+
+ TP_locvar(
+ u64 info1, info2;
+ ),
+
+ TP_code_pre(
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
+ kvm_x86_ops.get_exit_info(vcpu, &tp_locvar->info1,
+ &tp_locvar->info2);
+#else
+ kvm_x86_ops->get_exit_info(vcpu, &tp_locvar->info1,
+ &tp_locvar->info2);
+#endif
+ ),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, exit_reason, exit_reason)
+ ctf_integer(unsigned long, guest_rip, kvm_rip_read(vcpu))
+ ctf_integer(u32, isa, isa)
+ ctf_integer(u64, info1, tp_locvar->info1)
+ ctf_integer(u64, info2, tp_locvar->info2)
+ ),
+
+ TP_code_post()
+)
+
+/*
+ * Tracepoint for kvm interrupt injection:
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_inj_virq, kvm_x86_inj_virq,
+ TP_PROTO(unsigned int irq),
+ TP_ARGS(irq),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, irq, irq)
+ )
+)
+
+/*
+ * Tracepoint for kvm interrupt injection:
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_inj_exception, kvm_x86_inj_exception,
+ TP_PROTO(unsigned exception, bool has_error, unsigned error_code),
+ TP_ARGS(exception, has_error, error_code),
+
+ TP_FIELDS(
+ ctf_integer(u8, exception, exception)
+ ctf_integer(u8, has_error, has_error)
+ ctf_integer(u32, error_code, error_code)
+ )
+)
+
+/*
+ * Tracepoint for page fault.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_page_fault, kvm_x86_page_fault,
+ TP_PROTO(unsigned long fault_address, unsigned int error_code),
+ TP_ARGS(fault_address, error_code),
+
+ TP_FIELDS(
+ ctf_integer_hex(unsigned long, fault_address, fault_address)
+ ctf_integer(unsigned int, error_code, error_code)
+ )
+)
+
+/*
+ * Tracepoint for guest MSR access.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_msr, kvm_x86_msr,
+ TP_PROTO(unsigned write, u32 ecx, u64 data, bool exception),
+ TP_ARGS(write, ecx, data, exception),
+
+ TP_FIELDS(
+ ctf_integer(unsigned, write, write)
+ ctf_integer(u32, ecx, ecx)
+ ctf_integer(u64, data, data)
+ ctf_integer(u8, exception, exception)
+ )
+)
+
+#define trace_kvm_msr_read(ecx, data) trace_kvm_msr(0, ecx, data, false)
+#define trace_kvm_msr_write(ecx, data) trace_kvm_msr(1, ecx, data, false)
+#define trace_kvm_msr_read_ex(ecx) trace_kvm_msr(0, ecx, 0, true)
+#define trace_kvm_msr_write_ex(ecx, data) trace_kvm_msr(1, ecx, data, true)
+
+/*
+ * Tracepoint for guest CR access.
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_cr, kvm_x86_cr,
+ TP_PROTO(unsigned int rw, unsigned int cr, unsigned long val),
+ TP_ARGS(rw, cr, val),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, rw, rw)
+ ctf_integer(unsigned int, cr, cr)
+ ctf_integer(unsigned long, val, val)
+ )
+)
+
+#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)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_pic_set_irq, kvm_x86_pic_set_irq,
+ TP_PROTO(__u8 chip, __u8 pin, __u8 elcr, __u8 imr, bool coalesced),
+ TP_ARGS(chip, pin, elcr, imr, coalesced),
+
+ TP_FIELDS(
+ ctf_integer(__u8, chip, chip)
+ ctf_integer(__u8, pin, pin)
+ ctf_integer(__u8, elcr, elcr)
+ ctf_integer(__u8, imr, imr)
+ ctf_integer(bool, coalesced, coalesced)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_apic_ipi, kvm_x86_apic_ipi,
+ TP_PROTO(__u32 icr_low, __u32 dest_id),
+ TP_ARGS(icr_low, dest_id),
+
+ TP_FIELDS(
+ ctf_integer(__u32, icr_low, icr_low)
+ ctf_integer(__u32, dest_id, dest_id)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_apic_accept_irq, kvm_x86_apic_accept_irq,
+ TP_PROTO(__u32 apicid, __u16 dm, __u8 tm, __u8 vec, bool coalesced),
+ TP_ARGS(apicid, dm, tm, vec, coalesced),
+
+ TP_FIELDS(
+ ctf_integer(__u32, apicid, apicid)
+ ctf_integer(__u16, dm, dm)
+ ctf_integer(__u8, tm, tm)
+ ctf_integer(__u8, vec, vec)
+ ctf_integer(bool, coalesced, coalesced)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_eoi, kvm_x86_eoi,
+ TP_PROTO(struct kvm_lapic *apic, int vector),
+ TP_ARGS(apic, vector),
+
+ TP_FIELDS(
+ ctf_integer(__u32, apicid, apic->vcpu->vcpu_id)
+ ctf_integer(int, vector, vector)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_pv_eoi, kvm_x86_pv_eoi,
+ TP_PROTO(struct kvm_lapic *apic, int vector),
+ TP_ARGS(apic, vector),
+
+ TP_FIELDS(
+ ctf_integer(__u32, apicid, apic->vcpu->vcpu_id)
+ ctf_integer(int, vector, vector)
+ )
+)
+
+/*
+ * Tracepoint for nested VMRUN
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_nested_vmrun, kvm_x86_nested_vmrun,
+ TP_PROTO(__u64 rip, __u64 vmcb, __u64 nested_rip, __u32 int_ctl,
+ __u32 event_inj, bool npt),
+ TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, npt),
+
+ TP_FIELDS(
+ ctf_integer(__u64, rip, rip)
+ ctf_integer(__u64, vmcb, vmcb)
+ ctf_integer(__u64, nested_rip, nested_rip)
+ ctf_integer(__u32, int_ctl, int_ctl)
+ ctf_integer(__u32, event_inj, event_inj)
+ ctf_integer(bool, npt, npt)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_nested_intercepts, kvm_x86_nested_intercepts,
+ TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions, __u64 intercept),
+ TP_ARGS(cr_read, cr_write, exceptions, intercept),
+
+ TP_FIELDS(
+ ctf_integer(__u16, cr_read, cr_read)
+ ctf_integer(__u16, cr_write, cr_write)
+ ctf_integer(__u32, exceptions, exceptions)
+ ctf_integer(__u64, intercept, intercept)
+ )
+)
+/*
+ * Tracepoint for #VMEXIT while nested
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_nested_vmexit, kvm_x86_nested_vmexit,
+ TP_PROTO(__u64 rip, __u32 exit_code,
+ __u64 exit_info1, __u64 exit_info2,
+ __u32 exit_int_info, __u32 exit_int_info_err, __u32 isa),
+ TP_ARGS(rip, exit_code, exit_info1, exit_info2,
+ exit_int_info, exit_int_info_err, isa),
+
+ TP_FIELDS(
+ ctf_integer(__u64, rip, rip)
+ ctf_integer(__u32, exit_code, exit_code)
+ ctf_integer(__u64, exit_info1, exit_info1)
+ ctf_integer(__u64, exit_info2, exit_info2)
+ ctf_integer(__u32, exit_int_info, exit_int_info)
+ ctf_integer(__u32, exit_int_info_err, exit_int_info_err)
+ ctf_integer(__u32, isa, isa)
+ )
+)
+
+/*
+ * Tracepoint for #VMEXIT reinjected to the guest
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_nested_vmexit_inject, kvm_x86_nested_vmexit_inject,
+ TP_PROTO(__u32 exit_code,
+ __u64 exit_info1, __u64 exit_info2,
+ __u32 exit_int_info, __u32 exit_int_info_err, __u32 isa),
+ TP_ARGS(exit_code, exit_info1, exit_info2,
+ exit_int_info, exit_int_info_err, isa),
+
+ TP_FIELDS(
+ ctf_integer(__u32, exit_code, exit_code)
+ ctf_integer(__u64, exit_info1, exit_info1)
+ ctf_integer(__u64, exit_info2, exit_info2)
+ ctf_integer(__u32, exit_int_info, exit_int_info)
+ ctf_integer(__u32, exit_int_info_err, exit_int_info_err)
+ ctf_integer(__u32, isa, isa)
+ )
+)
+
+/*
+ * Tracepoint for nested #vmexit because of interrupt pending
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_nested_intr_vmexit, kvm_x86_nested_intr_vmexit,
+ TP_PROTO(__u64 rip),
+ TP_ARGS(rip),
+
+ TP_FIELDS(
+ ctf_integer(__u64, rip, rip)
+ )
+)
+
+/*
+ * Tracepoint for nested #vmexit because of interrupt pending
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_invlpga, kvm_x86_invlpga,
+ TP_PROTO(__u64 rip, int asid, u64 address),
+ TP_ARGS(rip, asid, address),
+
+ TP_FIELDS(
+ ctf_integer(__u64, rip, rip)
+ ctf_integer(int, asid, asid)
+ ctf_integer_hex(__u64, address, address)
+ )
+)
+
+/*
+ * Tracepoint for nested #vmexit because of interrupt pending
+ */
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_skinit, kvm_x86_skinit,
+ TP_PROTO(__u64 rip, __u32 slb),
+ TP_ARGS(rip, slb),
+
+ TP_FIELDS(
+ ctf_integer(__u64, rip, rip)
+ ctf_integer(__u32, slb, slb)
+ )
+)
+
+#define KVM_EMUL_INSN_F_CR0_PE (1 << 0)
+#define KVM_EMUL_INSN_F_EFL_VM (1 << 1)
+#define KVM_EMUL_INSN_F_CS_D (1 << 2)
+#define KVM_EMUL_INSN_F_CS_L (1 << 3)
+
+#define kvm_trace_symbol_emul_flags \
+ { 0, "real" }, \
+ { KVM_EMUL_INSN_F_CR0_PE \
+ | KVM_EMUL_INSN_F_EFL_VM, "vm16" }, \
+ { KVM_EMUL_INSN_F_CR0_PE, "prot16" }, \
+ { KVM_EMUL_INSN_F_CR0_PE \
+ | KVM_EMUL_INSN_F_CS_D, "prot32" }, \
+ { KVM_EMUL_INSN_F_CR0_PE \
+ | KVM_EMUL_INSN_F_CS_L, "prot64" }
+
+#define kei_decode_mode(mode) ({ \
+ u8 flags = 0xff; \
+ switch (mode) { \
+ case X86EMUL_MODE_REAL: \
+ flags = 0; \
+ break; \
+ case X86EMUL_MODE_VM86: \
+ flags = KVM_EMUL_INSN_F_EFL_VM; \
+ break; \
+ case X86EMUL_MODE_PROT16: \
+ flags = KVM_EMUL_INSN_F_CR0_PE; \
+ break; \
+ case X86EMUL_MODE_PROT32: \
+ flags = KVM_EMUL_INSN_F_CR0_PE \
+ | KVM_EMUL_INSN_F_CS_D; \
+ break; \
+ case X86EMUL_MODE_PROT64: \
+ flags = KVM_EMUL_INSN_F_CR0_PE \
+ | KVM_EMUL_INSN_F_CS_L; \
+ break; \
+ } \
+ flags; \
+ })
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_emulate_insn, kvm_x86_emulate_insn,
+ TP_PROTO(struct kvm_vcpu *vcpu, __u8 failed),
+ TP_ARGS(vcpu, failed),
+
+ TP_FIELDS(
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0))
+ ctf_integer(__u64, rip, vcpu->arch.emulate_ctxt.decode.fetch.start)
+ ctf_integer(__u32, csbase, kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS))
+ ctf_integer(__u8, len, vcpu->arch.emulate_ctxt.decode.eip
+ - vcpu->arch.emulate_ctxt.decode.fetch.start)
+ ctf_array(__u8, insn, vcpu->arch.emulate_ctxt.decode.fetch.data, 15)
+ ctf_integer(__u8, flags, kei_decode_mode(vcpu->arch.emulate_ctxt.mode))
+#elif (LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0))
+ ctf_integer(__u64, rip, vcpu->arch.emulate_ctxt.fetch.start)
+ ctf_integer(__u32, csbase, kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS))
+ ctf_integer(__u8, len, vcpu->arch.emulate_ctxt._eip
+ - vcpu->arch.emulate_ctxt.fetch.start)
+ ctf_array(__u8, insn, vcpu->arch.emulate_ctxt.fetch.data, 15)
+ ctf_integer(__u8, flags, kei_decode_mode(vcpu->arch.emulate_ctxt.mode))
+#elif (LINUX_VERSION_CODE < KERNEL_VERSION(5,7,0))
+ ctf_integer(__u64, rip, vcpu->arch.emulate_ctxt._eip -
+ (vcpu->arch.emulate_ctxt.fetch.ptr -
+ vcpu->arch.emulate_ctxt.fetch.data))
+ ctf_integer(__u32, csbase, kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS))
+ ctf_integer(__u8, len, vcpu->arch.emulate_ctxt.fetch.ptr -
+ vcpu->arch.emulate_ctxt.fetch.data)
+ ctf_array(__u8, insn, vcpu->arch.emulate_ctxt.fetch.data, 15)
+ ctf_integer(__u8, flags, kei_decode_mode(vcpu->arch.emulate_ctxt.mode))
+#else
+ ctf_integer(__u64, rip, vcpu->arch.emulate_ctxt->_eip -
+ (vcpu->arch.emulate_ctxt->fetch.ptr -
+ vcpu->arch.emulate_ctxt->fetch.data))
+ ctf_integer(__u32, csbase, kvm_x86_ops.get_segment_base(vcpu, VCPU_SREG_CS))
+ ctf_integer(__u8, len, vcpu->arch.emulate_ctxt->fetch.ptr -
+ vcpu->arch.emulate_ctxt->fetch.data)
+ ctf_array(__u8, insn, vcpu->arch.emulate_ctxt->fetch.data, 15)
+ ctf_integer(__u8, flags, kei_decode_mode(vcpu->arch.emulate_ctxt->mode))
+#endif
+ ctf_integer(__u8, failed, failed)
+ )
+)
+
+#define trace_kvm_emulate_insn_start(vcpu) trace_kvm_emulate_insn(vcpu, 0)
+#define trace_kvm_emulate_insn_failed(vcpu) trace_kvm_emulate_insn(vcpu, 1)
+
+LTTNG_TRACEPOINT_EVENT_MAP(
+ vcpu_match_mmio, kvm_x86_vcpu_match_mmio,
+ TP_PROTO(gva_t gva, gpa_t gpa, bool write, bool gpa_match),
+ TP_ARGS(gva, gpa, write, gpa_match),
+
+ TP_FIELDS(
+ ctf_integer(gva_t, gva, gva)
+ ctf_integer(gpa_t, gpa, gpa)
+ ctf_integer(bool, write, write)
+ ctf_integer(bool, gpa_match, gpa_match)
+ )
+)
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0))
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_write_tsc_offset, kvm_x86_write_tsc_offset,
+ TP_PROTO(unsigned int vcpu_id, __u64 previous_tsc_offset,
+ __u64 next_tsc_offset),
+ TP_ARGS(vcpu_id, previous_tsc_offset, next_tsc_offset),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, vcpu_id, vcpu_id)
+ ctf_integer(__u64, previous_tsc_offset, previous_tsc_offset)
+ ctf_integer(__u64, next_tsc_offset, next_tsc_offset)
+ )
+)
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
+#ifdef CONFIG_X86_64
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_update_master_clock, kvm_x86_update_master_clock,
+ TP_PROTO(bool use_master_clock, unsigned int host_clock, bool offset_matched),
+ TP_ARGS(use_master_clock, host_clock, offset_matched),
+
+ TP_FIELDS(
+ ctf_integer(bool, use_master_clock, use_master_clock)
+ ctf_integer(unsigned int, host_clock, host_clock)
+ ctf_integer(bool, offset_matched, offset_matched)
+ )
+)
+
+LTTNG_TRACEPOINT_EVENT_MAP(kvm_track_tsc, kvm_x86_track_tsc,
+ TP_PROTO(unsigned int vcpu_id, unsigned int nr_matched,
+ unsigned int online_vcpus, bool use_master_clock,
+ unsigned int host_clock),
+ TP_ARGS(vcpu_id, nr_matched, online_vcpus, use_master_clock,
+ host_clock),
+
+ TP_FIELDS(
+ ctf_integer(unsigned int, vcpu_id, vcpu_id)
+ ctf_integer(unsigned int, nr_vcpus_matched_tsc, nr_matched)
+ ctf_integer(unsigned int, online_vcpus, online_vcpus)
+ ctf_integer(bool, use_master_clock, use_master_clock)
+ ctf_integer(unsigned int, host_clock, host_clock)
+ )
+)
+
+#endif /* CONFIG_X86_64 */
+#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0) */
+
+#endif /* LTTNG_TRACE_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH instrumentation/events/lttng-module/arch/x86/kvm
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <lttng/define_trace.h>
projects / lttng-modules.git / blobdiff