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KVM: arm64: Add event support to the nVHE/pKVM hyp and trace remote

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Allow the creation of hypervisor and trace remote events with a single
macro HYP_EVENT(). That macro expands in the kernel side to add all
the required declarations (based on REMOTE_EVENT()) as well as in the
hypervisor side to create the trace_<event>() function.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260309162516.2623589-28-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort
2026-03-09 16:25:13 +00:00
committed by Marc Zyngier
parent 2194d317e0
commit 0a90fbc8a1
13 changed files with 184 additions and 2 deletions
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37
arch/arm64/kvm/hyp_trace.c
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@@ -318,6 +318,25 @@ static int hyp_trace_reset(unsigned int cpu, void *priv)
static int hyp_trace_enable_event(unsigned short id, bool enable, void *priv)
{
struct hyp_event_id *event_id = lm_alias(&__hyp_event_ids_start[id]);
struct page *page;
atomic_t *enabled;
void *map;
if (is_protected_kvm_enabled())
return kvm_call_hyp_nvhe(__tracing_enable_event, id, enable);
enabled = &event_id->enabled;
page = virt_to_page(enabled);
map = vmap(&page, 1, VM_MAP, PAGE_KERNEL);
if (!map)
return -ENOMEM;
enabled = map + offset_in_page(enabled);
atomic_set(enabled, enable);
vunmap(map);
return 0;
}
@@ -345,6 +364,19 @@ static struct trace_remote_callbacks trace_remote_callbacks = {
.enable_event = hyp_trace_enable_event,
};
#include <asm/kvm_define_hypevents.h>
static void __init hyp_trace_init_events(void)
{
struct hyp_event_id *hyp_event_id = __hyp_event_ids_start;
struct remote_event *event = __hyp_events_start;
int id = 0;
/* Events on both sides hypervisor are sorted */
for (; event < __hyp_events_end; event++, hyp_event_id++, id++)
event->id = hyp_event_id->id = id;
}
int __init kvm_hyp_trace_init(void)
{
int cpu;
@@ -364,5 +396,8 @@ int __init kvm_hyp_trace_init(void)
}
#endif
return trace_remote_register("hypervisor", &trace_remote_callbacks, &trace_buffer, NULL, 0);
hyp_trace_init_events();
return trace_remote_register("hypervisor", &trace_remote_callbacks, &trace_buffer,
__hyp_events_start, __hyp_events_end - __hyp_events_start);
}