From: "Jason A. Donenfeld" Jason@zx2c4.com
[ Upstream commit dda520d07b95072a0b63f6c52a8eb566d08ea897 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/um/os-Linux/skas/process.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 4fb877b99dde..0571cc0a30fc 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -5,6 +5,7 @@ */
#include <stdlib.h> +#include <stdbool.h> #include <unistd.h> #include <sched.h> #include <errno.h> @@ -641,10 +642,24 @@ 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)