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KVM: arm64: Add selftest event support to nVHE/pKVM hyp

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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>
This commit is contained in:
Vincent Donnefort 2026-03-09 16:25:15 +00:00 committed by Marc Zyngier
parent 696dfec22b
commit 5bbbed42f7
4 changed files with 42 additions and 0 deletions
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1
arch/arm64/include/asm/kvm_asm.h
View File

@ -96,6 +96,7 @@ enum __kvm_host_smccc_func {
__KVM_HOST_SMCCC_FUNC___tracing_update_clock,
__KVM_HOST_SMCCC_FUNC___tracing_reset,
__KVM_HOST_SMCCC_FUNC___tracing_enable_event,
__KVM_HOST_SMCCC_FUNC___tracing_write_event,
};
#define DECLARE_KVM_VHE_SYM(sym) extern char sym[]

11
arch/arm64/include/asm/kvm_hypevents.h
View File

@ -46,4 +46,15 @@ HYP_EVENT(hyp_exit,
),
HE_PRINTK("reason=%s vcpu=%d", __hyp_enter_exit_reason_str(__entry->reason), __entry->vcpu)
);
HYP_EVENT(selftest,
HE_PROTO(u64 id),
HE_STRUCT(
he_field(u64, id)
),
HE_ASSIGN(
__entry->id = id;
),
RE_PRINTK("id=%llu", __entry->id)
);
#endif

8
arch/arm64/kvm/hyp/nvhe/hyp-main.c
View File

@ -643,6 +643,13 @@ static void handle___tracing_enable_event(struct kvm_cpu_context *host_ctxt)
cpu_reg(host_ctxt, 1) = __tracing_enable_event(id, enable);
}
static void handle___tracing_write_event(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(u64, id, host_ctxt, 1);
trace_selftest(id);
}
typedef void (*hcall_t)(struct kvm_cpu_context *);
#define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
@ -691,6 +698,7 @@ static const hcall_t host_hcall[] = {
HANDLE_FUNC(__tracing_update_clock),
HANDLE_FUNC(__tracing_reset),
HANDLE_FUNC(__tracing_enable_event),
HANDLE_FUNC(__tracing_write_event),
};
static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)

22
arch/arm64/kvm/hyp_trace.c
View File

@ -348,8 +348,30 @@ static int hyp_trace_clock_show(struct seq_file *m, void *v)
}
DEFINE_SHOW_ATTRIBUTE(hyp_trace_clock);
static ssize_t hyp_trace_write_event_write(struct file *f, const char __user *ubuf,
size_t cnt, loff_t *pos)
{
unsigned long val;
int ret;
ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
if (ret)
return ret;
kvm_call_hyp_nvhe(__tracing_write_event, val);
return cnt;
}
static const struct file_operations hyp_trace_write_event_fops = {
.write = hyp_trace_write_event_write,
};
static int hyp_trace_init_tracefs(struct dentry *d, void *priv)
{
if (!tracefs_create_file("write_event", 0200, d, NULL, &hyp_trace_write_event_fops))
return -ENOMEM;
return tracefs_create_file("trace_clock", 0440, d, NULL, &hyp_trace_clock_fops) ?
0 : -ENOMEM;
}