Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
KVM: arm64: Add selftest event support to nVHE/pKVM hyp
Add a selftest event that can be triggered from a `write_event` tracefs
file. This intends to be used by trace remote selftests.
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260309162516.2623589-30-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
authored by
Vincent Donnefort
and committed by
Marc Zyngier
5bbbed42
696dfec2
+42
+1
arch/arm64/include/asm/kvm_asm.h
+1
arch/arm64/include/asm/kvm_asm.h
+11
arch/arm64/include/asm/kvm_hypevents.h
+11
arch/arm64/include/asm/kvm_hypevents.h
···
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),
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HE_PRINTK("reason=%s vcpu=%d", __hyp_enter_exit_reason_str(__entry->reason), __entry->vcpu)
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);
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+
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HYP_EVENT(selftest,
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HE_PROTO(u64 id),
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HE_STRUCT(
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he_field(u64, id)
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),
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HE_ASSIGN(
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__entry->id = id;
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),
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RE_PRINTK("id=%llu", __entry->id)
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);
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#endif
+8
arch/arm64/kvm/hyp/nvhe/hyp-main.c
+8
arch/arm64/kvm/hyp/nvhe/hyp-main.c
···
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cpu_reg(host_ctxt, 1) = __tracing_enable_event(id, enable);
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}
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static void handle___tracing_write_event(struct kvm_cpu_context *host_ctxt)
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{
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DECLARE_REG(u64, id, host_ctxt, 1);
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+
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trace_selftest(id);
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}
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+
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typedef void (*hcall_t)(struct kvm_cpu_context *);
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#define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
···
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HANDLE_FUNC(__tracing_update_clock),
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HANDLE_FUNC(__tracing_reset),
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HANDLE_FUNC(__tracing_enable_event),
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HANDLE_FUNC(__tracing_write_event),
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};
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static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
+22
arch/arm64/kvm/hyp_trace.c
+22
arch/arm64/kvm/hyp_trace.c
···
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}
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DEFINE_SHOW_ATTRIBUTE(hyp_trace_clock);
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static ssize_t hyp_trace_write_event_write(struct file *f, const char __user *ubuf,
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size_t cnt, loff_t *pos)
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{
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unsigned long val;
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int ret;
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+
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ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
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if (ret)
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return ret;
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kvm_call_hyp_nvhe(__tracing_write_event, val);
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return cnt;
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}
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+
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static const struct file_operations hyp_trace_write_event_fops = {
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.write = hyp_trace_write_event_write,
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};
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+
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static int hyp_trace_init_tracefs(struct dentry *d, void *priv)
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{
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if (!tracefs_create_file("write_event", 0200, d, NULL, &hyp_trace_write_event_fops))
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return -ENOMEM;
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+
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return tracefs_create_file("trace_clock", 0440, d, NULL, &hyp_trace_clock_fops) ?
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0 : -ENOMEM;
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}