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util/qemu-error: prepend guest name to error message to identify affected VM owner 

This is followup patch to the one submitted back in Oct, 19

https://lists.gnu.org/archive/html/qemu-devel/2019-10/msg02102.html

My mistake here, I took my eyes of the mailing list after I got the
initial thumbs up. This patch follows up on Markus comments in the
above link.

Purpose of this patch:

We want to print guest name for errors, warnings and info messages. This
was the first of two patches the second being MCE errors targeting a VM
with guest name prepended. But in a large fleet we see many other
errors that disable a VM or crash it. In a large fleet and centralized
logging having the guest name enables identify of owner and customer.

Signed-off-by: Mario Smarduch <msmarduch@digitalocean.com>
Message-Id: <20200626201900.8876-1-msmarduch@digitalocean.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Mario Smarduch 2020-06-26 13:19:00 -07:00 committed by Paolo Bonzini
parent 3bcb5840f1
commit 2880ffb089
4 changed files with 27 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/qemu/error-report.h
View File

@ -75,5 +75,7 @@ void error_init(const char *argv0);
const char *error_get_progname(void);
extern bool error_with_timestamp;
extern bool error_with_guestname;
extern const char *error_guest_name;
#endif

12
qemu-options.hx
View File

@ -4303,16 +4303,22 @@ HXCOMM Deprecated by -accel tcg
DEF("no-kvm", 0, QEMU_OPTION_no_kvm, "", QEMU_ARCH_I386)
DEF("msg", HAS_ARG, QEMU_OPTION_msg,
"-msg timestamp[=on|off]\n"
"-msg [timestamp[=on|off]][,guest-name=[on|off]]\n"
" control error message format\n"
" timestamp=on enables timestamps (default: off)\n",
" timestamp=on enables timestamps (default: off)\n"
" guest-name=on enables guest name prefix but only if\n"
" -name guest option is set (default: off)\n",
QEMU_ARCH_ALL)
SRST
``-msg timestamp[=on|off]``
``-msg [timestamp[=on|off]][,guest-name[=on|off]]``
Control error message format.
``timestamp=on|off``
Prefix messages with a timestamp. Default is off.
``guest-name=on|off``
Prefix messages with guest name but only if -name guest option is set
otherwise the option is ignored. Default is off.
ERST
DEF("dump-vmstate", HAS_ARG, QEMU_OPTION_dump_vmstate,

9
softmmu/vl.c
View File

@ -389,6 +389,12 @@ static QemuOptsList qemu_msg_opts = {
.name = "timestamp",
.type = QEMU_OPT_BOOL,
},
{
.name = "guest-name",
.type = QEMU_OPT_BOOL,
.help = "Prepends guest name for error messages but only if "
"-name guest is set otherwise option is ignored\n",
},
{ /* end of list */ }
},
};
@ -1114,6 +1120,7 @@ static void realtime_init(void)
static void configure_msg(QemuOpts *opts)
{
error_with_timestamp = qemu_opt_get_bool(opts, "timestamp", false);
error_with_guestname = qemu_opt_get_bool(opts, "guest-name", false);
}
@ -3592,6 +3599,8 @@ void qemu_init(int argc, char **argv, char **envp)
if (!opts) {
exit(1);
}
/* Capture guest name if -msg guest-name is used later */
error_guest_name = qemu_opt_get(opts, "guest");
break;
case QEMU_OPTION_prom_env:
if (nb_prom_envs >= MAX_PROM_ENVS) {

7
util/qemu-error.c
View File

@ -26,6 +26,8 @@ typedef enum {
/* Prepend timestamp to messages */
bool error_with_timestamp;
bool error_with_guestname;
const char *error_guest_name;
int error_printf(const char *fmt, ...)
{
@ -213,6 +215,11 @@ static void vreport(report_type type, const char *fmt, va_list ap)
g_free(timestr);
}
/* Only prepend guest name if -msg guest-name and -name guest=... are set */
if (error_with_guestname && error_guest_name && !cur_mon) {
error_printf("%s ", error_guest_name);
}
print_loc();
switch (type) {