mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-11 19:19:42 +00:00
1c5ac21a0e
Some versions of Intel PT do not support tracing across VMXON, more specifically, VMXON will clear TraceEn control bit and any attempt to set it before VMXOFF will throw a #GP, which in the current state of things will crash the kernel. Namely: $ perf record -e intel_pt// kvm -nographic on such a machine will kill it. To avoid this, notify the intel_pt driver before VMXON and after VMXOFF so that it knows when not to enable itself. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Gleb Natapov <gleb@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: hpa@zytor.com Link: http://lkml.kernel.org/r/87oa9dwrfk.fsf@ashishki-desk.ger.corp.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
|
|
* Intel(R) Processor Trace PMU driver for perf
|
|
* Copyright (c) 2013-2014, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* Intel PT is specified in the Intel Architecture Instruction Set Extensions
|
|
* Programming Reference:
|
|
* http://software.intel.com/en-us/intel-isa-extensions
|
|
*/
|
|
|
|
#ifndef __INTEL_PT_H__
|
|
#define __INTEL_PT_H__
|
|
|
|
/*
|
|
* Single-entry ToPA: when this close to region boundary, switch
|
|
* buffers to avoid losing data.
|
|
*/
|
|
#define TOPA_PMI_MARGIN 512
|
|
|
|
#define TOPA_SHIFT 12
|
|
|
|
static inline unsigned int sizes(unsigned int tsz)
|
|
{
|
|
return 1 << (tsz + TOPA_SHIFT);
|
|
};
|
|
|
|
struct topa_entry {
|
|
u64 end : 1;
|
|
u64 rsvd0 : 1;
|
|
u64 intr : 1;
|
|
u64 rsvd1 : 1;
|
|
u64 stop : 1;
|
|
u64 rsvd2 : 1;
|
|
u64 size : 4;
|
|
u64 rsvd3 : 2;
|
|
u64 base : 36;
|
|
u64 rsvd4 : 16;
|
|
};
|
|
|
|
#define PT_CPUID_LEAVES 2
|
|
#define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */
|
|
|
|
enum pt_capabilities {
|
|
PT_CAP_max_subleaf = 0,
|
|
PT_CAP_cr3_filtering,
|
|
PT_CAP_psb_cyc,
|
|
PT_CAP_mtc,
|
|
PT_CAP_topa_output,
|
|
PT_CAP_topa_multiple_entries,
|
|
PT_CAP_single_range_output,
|
|
PT_CAP_payloads_lip,
|
|
PT_CAP_mtc_periods,
|
|
PT_CAP_cycle_thresholds,
|
|
PT_CAP_psb_periods,
|
|
};
|
|
|
|
struct pt_pmu {
|
|
struct pmu pmu;
|
|
u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
|
|
bool vmx;
|
|
};
|
|
|
|
/**
|
|
* struct pt_buffer - buffer configuration; one buffer per task_struct or
|
|
* cpu, depending on perf event configuration
|
|
* @cpu: cpu for per-cpu allocation
|
|
* @tables: list of ToPA tables in this buffer
|
|
* @first: shorthand for first topa table
|
|
* @last: shorthand for last topa table
|
|
* @cur: current topa table
|
|
* @nr_pages: buffer size in pages
|
|
* @cur_idx: current output region's index within @cur table
|
|
* @output_off: offset within the current output region
|
|
* @data_size: running total of the amount of data in this buffer
|
|
* @lost: if data was lost/truncated
|
|
* @head: logical write offset inside the buffer
|
|
* @snapshot: if this is for a snapshot/overwrite counter
|
|
* @stop_pos: STOP topa entry in the buffer
|
|
* @intr_pos: INT topa entry in the buffer
|
|
* @data_pages: array of pages from perf
|
|
* @topa_index: table of topa entries indexed by page offset
|
|
*/
|
|
struct pt_buffer {
|
|
int cpu;
|
|
struct list_head tables;
|
|
struct topa *first, *last, *cur;
|
|
unsigned int cur_idx;
|
|
size_t output_off;
|
|
unsigned long nr_pages;
|
|
local_t data_size;
|
|
local_t lost;
|
|
local64_t head;
|
|
bool snapshot;
|
|
unsigned long stop_pos, intr_pos;
|
|
void **data_pages;
|
|
struct topa_entry *topa_index[0];
|
|
};
|
|
|
|
/**
|
|
* struct pt - per-cpu pt context
|
|
* @handle: perf output handle
|
|
* @handle_nmi: do handle PT PMI on this cpu, there's an active event
|
|
* @vmx_on: 1 if VMX is ON on this cpu
|
|
*/
|
|
struct pt {
|
|
struct perf_output_handle handle;
|
|
int handle_nmi;
|
|
int vmx_on;
|
|
};
|
|
|
|
#endif /* __INTEL_PT_H__ */
|