From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001
From: Zeng Chi <zengchi@kylinos.cn>
Date: Mon, 21 Sep 2026 18:24:42 +0800
Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL
 attributes

Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.

Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 include/trace/events/fib.h | 104 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 include/trace/events/fib.h

(limited to 'include/trace/events/fib.h')

diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
new file mode 100644
index 000000000..feb28b359
--- /dev/null
+++ b/include/trace/events/fib.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fib
+
+#if !defined(_TRACE_FIB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FIB_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <net/flow.h>
+#include <net/inet_dscp.h>
+#include <net/ip_fib.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(fib_table_lookup,
+
+	TP_PROTO(u32 tb_id, const struct flowi4 *flp,
+		 const struct fib_nh_common *nhc, int err),
+
+	TP_ARGS(tb_id, flp, nhc, err),
+
+	TP_STRUCT__entry(
+		__field(	u32,	tb_id		)
+		__field(	int,	err		)
+		__field(	int,	oif		)
+		__field(	int,	iif		)
+		__field(	u8,	proto		)
+		__field(	__u8,	tos		)
+		__field(	__u8,	scope		)
+		__field(	__u8,	flags		)
+		__array(	__u8,	src,	4	)
+		__array(	__u8,	dst,	4	)
+		__array(	__u8,	gw4,	4	)
+		__array(	__u8,	gw6,	16	)
+		__field(	u16,	sport		)
+		__field(	u16,	dport		)
+		__array(char,  name,   IFNAMSIZ )
+	),
+
+	TP_fast_assign(
+		struct net_device *dev;
+		struct in6_addr *in6;
+		__be32 *p32;
+
+		__entry->tb_id = tb_id;
+		__entry->err = err;
+		__entry->oif = flp->flowi4_oif;
+		__entry->iif = flp->flowi4_iif;
+		__entry->tos = inet_dscp_to_dsfield(flp->flowi4_dscp);
+		__entry->scope = flp->flowi4_scope;
+		__entry->flags = flp->flowi4_flags;
+
+		p32 = (__be32 *) __entry->src;
+		*p32 = flp->saddr;
+
+		p32 = (__be32 *) __entry->dst;
+		*p32 = flp->daddr;
+
+		__entry->proto = flp->flowi4_proto;
+		if (__entry->proto == IPPROTO_TCP ||
+		    __entry->proto == IPPROTO_UDP) {
+			__entry->sport = ntohs(flp->fl4_sport);
+			__entry->dport = ntohs(flp->fl4_dport);
+		} else {
+			__entry->sport = 0;
+			__entry->dport = 0;
+		}
+
+		dev = nhc ? nhc->nhc_dev : NULL;
+		strscpy(__entry->name, dev ? dev->name : "-", IFNAMSIZ);
+
+		if (nhc) {
+			if (nhc->nhc_gw_family == AF_INET) {
+				p32 = (__be32 *) __entry->gw4;
+				*p32 = nhc->nhc_gw.ipv4;
+
+				in6 = (struct in6_addr *)__entry->gw6;
+				*in6 = in6addr_any;
+			} else if (nhc->nhc_gw_family == AF_INET6) {
+				p32 = (__be32 *) __entry->gw4;
+				*p32 = 0;
+
+				in6 = (struct in6_addr *)__entry->gw6;
+				*in6 = nhc->nhc_gw.ipv6;
+			}
+		} else {
+			p32 = (__be32 *) __entry->gw4;
+			*p32 = 0;
+
+			in6 = (struct in6_addr *)__entry->gw6;
+			*in6 = in6addr_any;
+		}
+	),
+
+	TP_printk("table %u oif %d iif %d proto %u %pI4/%u -> %pI4/%u tos %d scope %d flags %x ==> dev %s gw %pI4/%pI6c err %d",
+		  __entry->tb_id, __entry->oif, __entry->iif, __entry->proto,
+		  __entry->src, __entry->sport, __entry->dst, __entry->dport,
+		  __entry->tos, __entry->scope, __entry->flags,
+		  __entry->name, __entry->gw4, __entry->gw6, __entry->err)
+);
+#endif /* _TRACE_FIB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
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