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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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18
arch/arm64/kernel/vmlinux.lds.S
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@@ -13,12 +13,23 @@
*(__kvm_ex_table) \
__stop___kvm_ex_table = .;
#ifdef CONFIG_NVHE_EL2_TRACING
#define HYPERVISOR_EVENT_IDS \
. = ALIGN(PAGE_SIZE); \
__hyp_event_ids_start = .; \
*(HYP_SECTION_NAME(.event_ids)) \
__hyp_event_ids_end = .;
#else
#define HYPERVISOR_EVENT_IDS
#endif
#define HYPERVISOR_RODATA_SECTIONS \
HYP_SECTION_NAME(.rodata) : { \
. = ALIGN(PAGE_SIZE); \
__hyp_rodata_start = .; \
*(HYP_SECTION_NAME(.data..ro_after_init)) \
*(HYP_SECTION_NAME(.rodata)) \
HYPERVISOR_EVENT_IDS \
. = ALIGN(PAGE_SIZE); \
__hyp_rodata_end = .; \
}
@@ -307,6 +318,13 @@ SECTIONS
HYPERVISOR_DATA_SECTION
#ifdef CONFIG_NVHE_EL2_TRACING
.data.hyp_events : {
__hyp_events_start = .;
*(SORT(_hyp_events.*))
__hyp_events_end = .;
}
#endif
/*
* Data written with the MMU off but read with the MMU on requires
* cache lines to be invalidated, discarding up to a Cache Writeback