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 --- drivers/thunderbolt/trace.h | 197 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 197 insertions(+) create mode 100644 drivers/thunderbolt/trace.h (limited to 'drivers/thunderbolt/trace.h') diff --git a/drivers/thunderbolt/trace.h b/drivers/thunderbolt/trace.h new file mode 100644 index 000000000..6d0776514 --- /dev/null +++ b/drivers/thunderbolt/trace.h @@ -0,0 +1,197 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Thunderbolt tracing support + * + * Copyright (C) 2024, Intel Corporation + * Author: Mika Westerberg + * Gil Fine + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM thunderbolt + +#if !defined(TB_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ) +#define TB_TRACE_H_ + +#include +#include + +#include "tb_msgs.h" + +#define tb_cfg_type_name(type) { type, #type } +#define show_type_name(val) \ + __print_symbolic(val, \ + tb_cfg_type_name(TB_CFG_PKG_READ), \ + tb_cfg_type_name(TB_CFG_PKG_WRITE), \ + tb_cfg_type_name(TB_CFG_PKG_ERROR), \ + tb_cfg_type_name(TB_CFG_PKG_NOTIFY_ACK), \ + tb_cfg_type_name(TB_CFG_PKG_EVENT), \ + tb_cfg_type_name(TB_CFG_PKG_XDOMAIN_REQ), \ + tb_cfg_type_name(TB_CFG_PKG_XDOMAIN_RESP), \ + tb_cfg_type_name(TB_CFG_PKG_OVERRIDE), \ + tb_cfg_type_name(TB_CFG_PKG_RESET), \ + tb_cfg_type_name(TB_CFG_PKG_ICM_EVENT), \ + tb_cfg_type_name(TB_CFG_PKG_ICM_CMD), \ + tb_cfg_type_name(TB_CFG_PKG_ICM_RESP)) + +#ifndef TB_TRACE_HELPERS +#define TB_TRACE_HELPERS +static inline const char *show_data_read_write(struct trace_seq *p, + const u32 *data) +{ + const struct cfg_read_pkg *msg = (const struct cfg_read_pkg *)data; + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "offset=%#x, len=%u, port=%d, config=%#x, seq=%d, ", + msg->addr.offset, msg->addr.length, msg->addr.port, + msg->addr.space, msg->addr.seq); + + return ret; +} + +static inline const char *show_data_error(struct trace_seq *p, const u32 *data) +{ + const struct cfg_error_pkg *msg = (const struct cfg_error_pkg *)data; + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "error=%#x, port=%d, plug=%#x, ", msg->error, + msg->port, msg->pg); + + return ret; +} + +static inline const char *show_data_event(struct trace_seq *p, const u32 *data) +{ + const struct cfg_event_pkg *msg = (const struct cfg_event_pkg *)data; + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "port=%d, unplug=%#x, ", msg->port, msg->unplug); + + return ret; +} + +static inline const char *show_route(struct trace_seq *p, const u32 *data) +{ + const struct tb_cfg_header *header = (const struct tb_cfg_header *)data; + const char *ret = trace_seq_buffer_ptr(p); + + trace_seq_printf(p, "route=%llx, ", tb_cfg_get_route(header)); + + return ret; +} + +static inline const char *show_data(struct trace_seq *p, u8 type, + const u32 *data, u32 length) +{ + const char *ret = trace_seq_buffer_ptr(p); + const char *prefix = ""; + int i; + + switch (type) { + case TB_CFG_PKG_READ: + case TB_CFG_PKG_WRITE: + show_route(p, data); + show_data_read_write(p, data); + break; + + case TB_CFG_PKG_ERROR: + show_route(p, data); + show_data_error(p, data); + break; + + case TB_CFG_PKG_EVENT: + show_route(p, data); + show_data_event(p, data); + break; + + case TB_CFG_PKG_ICM_EVENT: + case TB_CFG_PKG_ICM_CMD: + case TB_CFG_PKG_ICM_RESP: + /* ICM messages always target the host router */ + trace_seq_puts(p, "route=0, "); + break; + + default: + show_route(p, data); + break; + } + + trace_seq_printf(p, "data=["); + for (i = 0; i < length; i++) { + trace_seq_printf(p, "%s0x%08x", prefix, data[i]); + prefix = ", "; + } + trace_seq_printf(p, "]"); + trace_seq_putc(p, 0); + + return ret; +} +#endif + +DECLARE_EVENT_CLASS(tb_raw, + TP_PROTO(int index, u8 type, const void *data, size_t size), + TP_ARGS(index, type, data, size), + TP_STRUCT__entry( + __field(int, index) + __field(u8, type) + __field(size_t, size) + __dynamic_array(u32, data, size / 4) + ), + TP_fast_assign( + __entry->index = index; + __entry->type = type; + __entry->size = size / 4; + memcpy(__get_dynamic_array(data), data, size); + ), + TP_printk("type=%s, size=%zd, domain=%d, %s", + show_type_name(__entry->type), __entry->size, __entry->index, + show_data(p, __entry->type, __get_dynamic_array(data), + __entry->size) + ) +); + +DEFINE_EVENT(tb_raw, tb_tx, + TP_PROTO(int index, u8 type, const void *data, size_t size), + TP_ARGS(index, type, data, size) +); + +DEFINE_EVENT(tb_raw, tb_event, + TP_PROTO(int index, u8 type, const void *data, size_t size), + TP_ARGS(index, type, data, size) +); + +TRACE_EVENT(tb_rx, + TP_PROTO(int index, u8 type, const void *data, size_t size, bool dropped), + TP_ARGS(index, type, data, size, dropped), + TP_STRUCT__entry( + __field(int, index) + __field(u8, type) + __field(size_t, size) + __dynamic_array(u32, data, size / 4) + __field(bool, dropped) + ), + TP_fast_assign( + __entry->index = index; + __entry->type = type; + __entry->size = size / 4; + memcpy(__get_dynamic_array(data), data, size); + __entry->dropped = dropped; + ), + TP_printk("type=%s, dropped=%u, size=%zd, domain=%d, %s", + show_type_name(__entry->type), __entry->dropped, + __entry->size, __entry->index, + show_data(p, __entry->type, __get_dynamic_array(data), + __entry->size) + ) +); + +#endif /* TB_TRACE_H_ */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . + +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +/* This part must be outside protection */ +#include -- cgit v1.3.1