From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical. Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration") Cc: stable@vger.kernel.org Reported-by: Stefan Teodorescu Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- include/trace/events/objagg.h | 228 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 228 insertions(+) create mode 100644 include/trace/events/objagg.h (limited to 'include/trace/events/objagg.h') diff --git a/include/trace/events/objagg.h b/include/trace/events/objagg.h new file mode 100644 index 000000000..fcec0fc9e --- /dev/null +++ b/include/trace/events/objagg.h @@ -0,0 +1,228 @@ +/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */ +/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM objagg + +#if !defined(__TRACE_OBJAGG_H) || defined(TRACE_HEADER_MULTI_READ) +#define __TRACE_OBJAGG_H + +#include + +struct objagg; +struct objagg_obj; + +TRACE_EVENT(objagg_create, + TP_PROTO(const struct objagg *objagg), + + TP_ARGS(objagg), + + TP_STRUCT__entry( + __field(const void *, objagg) + ), + + TP_fast_assign( + __entry->objagg = objagg; + ), + + TP_printk("objagg %p", __entry->objagg) +); + +TRACE_EVENT(objagg_destroy, + TP_PROTO(const struct objagg *objagg), + + TP_ARGS(objagg), + + TP_STRUCT__entry( + __field(const void *, objagg) + ), + + TP_fast_assign( + __entry->objagg = objagg; + ), + + TP_printk("objagg %p", __entry->objagg) +); + +TRACE_EVENT(objagg_obj_create, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj), + + TP_ARGS(objagg, obj), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + ), + + TP_printk("objagg %p, obj %p", __entry->objagg, __entry->obj) +); + +TRACE_EVENT(objagg_obj_destroy, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj), + + TP_ARGS(objagg, obj), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + ), + + TP_printk("objagg %p, obj %p", __entry->objagg, __entry->obj) +); + +TRACE_EVENT(objagg_obj_get, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj, + unsigned int refcount), + + TP_ARGS(objagg, obj, refcount), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + __field(unsigned int, refcount) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + __entry->refcount = refcount; + ), + + TP_printk("objagg %p, obj %p, refcount %u", + __entry->objagg, __entry->obj, __entry->refcount) +); + +TRACE_EVENT(objagg_obj_put, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj, + unsigned int refcount), + + TP_ARGS(objagg, obj, refcount), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + __field(unsigned int, refcount) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + __entry->refcount = refcount; + ), + + TP_printk("objagg %p, obj %p, refcount %u", + __entry->objagg, __entry->obj, __entry->refcount) +); + +TRACE_EVENT(objagg_obj_parent_assign, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj, + const struct objagg_obj *parent, + unsigned int parent_refcount), + + TP_ARGS(objagg, obj, parent, parent_refcount), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + __field(const void *, parent) + __field(unsigned int, parent_refcount) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + __entry->parent = parent; + __entry->parent_refcount = parent_refcount; + ), + + TP_printk("objagg %p, obj %p, parent %p, parent_refcount %u", + __entry->objagg, __entry->obj, + __entry->parent, __entry->parent_refcount) +); + +TRACE_EVENT(objagg_obj_parent_unassign, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj, + const struct objagg_obj *parent, + unsigned int parent_refcount), + + TP_ARGS(objagg, obj, parent, parent_refcount), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + __field(const void *, parent) + __field(unsigned int, parent_refcount) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + __entry->parent = parent; + __entry->parent_refcount = parent_refcount; + ), + + TP_printk("objagg %p, obj %p, parent %p, parent_refcount %u", + __entry->objagg, __entry->obj, + __entry->parent, __entry->parent_refcount) +); + +TRACE_EVENT(objagg_obj_root_create, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj), + + TP_ARGS(objagg, obj), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + ), + + TP_printk("objagg %p, obj %p", + __entry->objagg, __entry->obj) +); + +TRACE_EVENT(objagg_obj_root_destroy, + TP_PROTO(const struct objagg *objagg, + const struct objagg_obj *obj), + + TP_ARGS(objagg, obj), + + TP_STRUCT__entry( + __field(const void *, objagg) + __field(const void *, obj) + ), + + TP_fast_assign( + __entry->objagg = objagg; + __entry->obj = obj; + ), + + TP_printk("objagg %p, obj %p", + __entry->objagg, __entry->obj) +); + +#endif /* __TRACE_OBJAGG_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1