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| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-05-22 12:54:33 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-05-22 15:54:22 +0200 |
| commit | 4d99e4136580d178e3523281a820be17bf814bf8 (patch) | |
| tree | d1f02c7784460d529d50ef1014197ff47d2cc07b /tools/perf/util/machine.h | |
| parent | perf machine: Add nr_cpus_avail() (diff) | |
| download | linux-4d99e4136580d178e3523281a820be17bf814bf8.tar.xz linux-4d99e4136580d178e3523281a820be17bf814bf8.zip | |
perf machine: Workaround missing maps for x86 PTI entry trampolines
On x86_64 the PTI entry trampolines are not in the kernel map created by
perf tools. That results in the addresses having no symbols and prevents
annotation. It also causes Intel PT to have decoding errors at the
trampoline addresses.
Workaround that by creating maps for the trampolines.
At present the kernel does not export information revealing where the
trampolines are. Until that happens, the addresses are hardcoded.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1526986485-6562-6-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/machine.h')
| -rw-r--r-- | tools/perf/util/machine.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h index 2d2b092ba753..b6a1c3eb3d65 100644 --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -268,4 +268,7 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, */ char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp); +int machine__map_x86_64_entry_trampolines(struct machine *machine, + struct dso *kernel); + #endif /* __PERF_MACHINE_H */ |