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accel/tcg: Unmap perf_marker

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Coverity complains that perf_marker is never unmapped.
Fix by unmapping it in perf_exit().

Fixes: Coverity CID 1507929
Fixes: 5584e2dbe8 ("tcg: add perfmap and jitdump")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230605114134.1169974-1-iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2023-06-05 13:41:34 +02:00 • committed by Richard Henderson
parent 514fea9eaf
commit e7cd7a3916
1 changed files with 9 additions and 2 deletions
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11
accel/tcg/perf.c
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@ -111,6 +111,8 @@ static void write_perfmap_entry(const void *start, size_t insn,
} }
static FILE *jitdump; static FILE *jitdump;
static size_t perf_marker_size;
static void *perf_marker = MAP_FAILED;
#define JITHEADER_MAGIC 0x4A695444 #define JITHEADER_MAGIC 0x4A695444
#define JITHEADER_VERSION 1 #define JITHEADER_VERSION 1
@ -190,7 +192,6 @@ void perf_enable_jitdump(void)
{ {
struct jitheader header; struct jitheader header;
char jitdump_file[32]; char jitdump_file[32];
void *perf_marker;
if (!use_rt_clock) { if (!use_rt_clock) {
warn_report("CLOCK_MONOTONIC is not available, proceeding without jitdump"); warn_report("CLOCK_MONOTONIC is not available, proceeding without jitdump");
@ -210,7 +211,8 @@ void perf_enable_jitdump(void)
* PERF_RECORD_MMAP or PERF_RECORD_MMAP2 event is of the form jit-%d.dump * PERF_RECORD_MMAP or PERF_RECORD_MMAP2 event is of the form jit-%d.dump
* and will process it as a jitdump file. * and will process it as a jitdump file.
*/ */
perf_marker = mmap(NULL, qemu_real_host_page_size(), PROT_READ | PROT_EXEC, perf_marker_size = qemu_real_host_page_size();
perf_marker = mmap(NULL, perf_marker_size, PROT_READ | PROT_EXEC,
MAP_PRIVATE, fileno(jitdump), 0); MAP_PRIVATE, fileno(jitdump), 0);
if (perf_marker == MAP_FAILED) { if (perf_marker == MAP_FAILED) {
warn_report("Could not map %s: %s, proceeding without jitdump", warn_report("Could not map %s: %s, proceeding without jitdump",
@ -372,6 +374,11 @@ void perf_exit(void)
perfmap = NULL; perfmap = NULL;
} }
if (perf_marker != MAP_FAILED) {
munmap(perf_marker, perf_marker_size);
perf_marker = MAP_FAILED;
}
if (jitdump) { if (jitdump) {
fclose(jitdump); fclose(jitdump);
jitdump = NULL; jitdump = NULL;