mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-09-18 23:09:29 +02:00
Yuhang.Chen
5044816169
Add RISC-V KVM tracepoints for events that are useful when debugging guest exits and in-kernel emulation paths. The existing kvm_entry and kvm_exit tracepoints are kept, with the kvm_entry PC format fixed to use zero-padded hexadecimal output. The newly added tracepoints cover: - kvm_vcpu_exit for synchronous guest traps - kvm_vcpu_irq for VS-mode interrupt set/clear - kvm_mmio_emulate for MMIO load/store emulation kvm_vcpu_exit reports the full trap context (sepc/scause/stval/htval/ htinst) so userspace can filter by scause, and is placed after the interrupt early-return so it fires only for synchronous traps. kvm_vcpu_irq covers every set/unset_interrupt() caller from a single place. Example trace output: kvm_vcpu_exit: VCPU: 0, SEPC: 0x80200000, SCAUSE: 0x17, STVAL: 0x10000000, HTVAL: 0x4000000, HTINST: 0x2023 kvm_mmio_emulate: VCPU: 0, Store MMIO at 0x10000000, len 4, insn 0x2023, sepc 0x80200000 kvm_vcpu_irq: VCPU: 0, IRQ: 10, level: 1 Testing: A QEMU-based test program was used to exercise: - Guest page faults - MMIO emulation - IRQ injection Verified trace output generation for: - kvm_vcpu_exit - kvm_vcpu_irq - kvm_mmio_emulate Assisted-by: YuanSheng:deepseek-v4-pro Co-developed-by: Quan Zhou <zhouquan@iscas.ac.cn> Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn> Signed-off-by: Yuhang.Chen <yhchen312@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260730065711.3721489-1-yhchen312@gmail.com Signed-off-by: Anup Patel <anup@brainfault.org>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Tracepoints for RISC-V KVM
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*
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* Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
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*
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*/
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#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_KVM_H
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#include <linux/tracepoint.h>
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM kvm
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TRACE_EVENT(kvm_entry,
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TP_PROTO(struct kvm_vcpu *vcpu),
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TP_ARGS(vcpu),
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TP_STRUCT__entry(
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__field(unsigned long, pc)
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),
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TP_fast_assign(
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__entry->pc = vcpu->arch.guest_context.sepc;
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),
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TP_printk("PC: 0x%016lx", __entry->pc)
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);
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TRACE_EVENT(kvm_exit,
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TP_PROTO(struct kvm_cpu_trap *trap),
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TP_ARGS(trap),
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TP_STRUCT__entry(
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__field(unsigned long, sepc)
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__field(unsigned long, scause)
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__field(unsigned long, stval)
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__field(unsigned long, htval)
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__field(unsigned long, htinst)
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),
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TP_fast_assign(
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__entry->sepc = trap->sepc;
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__entry->scause = trap->scause;
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__entry->stval = trap->stval;
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__entry->htval = trap->htval;
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__entry->htinst = trap->htinst;
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),
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TP_printk("SEPC:0x%lx, SCAUSE:0x%lx, STVAL:0x%lx, HTVAL:0x%lx, HTINST:0x%lx",
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__entry->sepc,
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__entry->scause,
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__entry->stval,
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__entry->htval,
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__entry->htinst)
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);
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TRACE_EVENT(kvm_mmio_emulate,
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TP_PROTO(unsigned long vcpu_id, unsigned long sepc, unsigned long insn,
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unsigned long fault_addr, bool write, int len),
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TP_ARGS(vcpu_id, sepc, insn, fault_addr, write, len),
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TP_STRUCT__entry(
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__field(unsigned long, vcpu_id)
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__field(unsigned long, sepc)
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__field(unsigned long, insn)
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__field(unsigned long, fault_addr)
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__field(bool, write)
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__field(int, len)
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),
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TP_fast_assign(
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__entry->vcpu_id = vcpu_id;
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__entry->sepc = sepc;
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__entry->insn = insn;
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__entry->fault_addr = fault_addr;
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__entry->write = write;
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__entry->len = len;
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),
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TP_printk("VCPU: %lu, %s MMIO at 0x%lx, len %d, insn 0x%lx, sepc 0x%lx",
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__entry->vcpu_id, __entry->write ? "Store" : "Load",
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__entry->fault_addr, __entry->len, __entry->insn,
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__entry->sepc)
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);
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TRACE_EVENT(kvm_vcpu_exit,
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TP_PROTO(unsigned long vcpu_id, unsigned long sepc, unsigned long scause,
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unsigned long stval, unsigned long htval, unsigned long htinst),
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TP_ARGS(vcpu_id, sepc, scause, stval, htval, htinst),
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TP_STRUCT__entry(
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__field(unsigned long, vcpu_id)
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__field(unsigned long, sepc)
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__field(unsigned long, scause)
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__field(unsigned long, stval)
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__field(unsigned long, htval)
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__field(unsigned long, htinst)
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),
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TP_fast_assign(
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__entry->vcpu_id = vcpu_id;
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__entry->sepc = sepc;
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__entry->scause = scause;
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__entry->stval = stval;
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__entry->htval = htval;
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__entry->htinst = htinst;
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),
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TP_printk("VCPU: %lu, SEPC: 0x%lx, SCAUSE: 0x%lx, STVAL: 0x%lx, HTVAL: 0x%lx, HTINST: 0x%lx",
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__entry->vcpu_id, __entry->sepc, __entry->scause,
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__entry->stval, __entry->htval, __entry->htinst)
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);
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TRACE_EVENT(kvm_vcpu_irq,
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TP_PROTO(unsigned long vcpu_id, unsigned int irq, int level),
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TP_ARGS(vcpu_id, irq, level),
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TP_STRUCT__entry(
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__field(unsigned long, vcpu_id)
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__field(unsigned int, irq)
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__field(int, level)
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),
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TP_fast_assign(
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__entry->vcpu_id = vcpu_id;
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__entry->irq = irq;
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__entry->level = level;
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),
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TP_printk("VCPU: %lu, IRQ: %u, level: %d",
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__entry->vcpu_id, __entry->irq, __entry->level)
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);
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#endif /* _TRACE_KVM_H */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE trace
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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