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um: add "noreboot" command line option for PANIC_TIMEOUT=-1 setups

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QEMU has a -no-reboot option, which halts instead of reboots when the
guest asks to reboot. This is invaluable when used with
CONFIG_PANIC_TIMEOUT=-1 (and panic_on_warn), because it allows panics
and warnings to be caught immediately in CI. Implement this in UML too,
by way of a basic setup param.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Jason A. Donenfeld 2022-07-13 13:56:17 +02:00 committed by Richard Weinberger
parent 7ac73fbb54
commit dda520d07b
1 changed files with 16 additions and 1 deletions
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17
arch/um/os-Linux/skas/process.c
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@ -5,6 +5,7 @@
*/
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <sched.h>
#include <errno.h>
@ -707,10 +708,24 @@ void halt_skas(void)
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
}
static bool noreboot;
static int __init noreboot_cmd_param(char *str, int *add)
{
noreboot = true;
return 0;
}
__uml_setup("noreboot", noreboot_cmd_param,
"noreboot\n"
" Rather than rebooting, exit always, akin to QEMU's -no-reboot option.\n"
" This is useful if you're using CONFIG_PANIC_TIMEOUT in order to catch\n"
" crashes in CI\n");
void reboot_skas(void)
{
block_signals_trace();
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
UML_LONGJMP(&initial_jmpbuf, noreboot ? INIT_JMP_HALT : INIT_JMP_REBOOT);
}
void __switch_mm(struct mm_id *mm_idp)