On 30/06/2022 13.30, Nico Boehr wrote:
An invalid PSW causes a program interrupt. When an invalid PSW is
introduced in the pgm_new_psw, an interrupt loop occurs as soon as a
program interrupt is caused.
QEMU should detect that and panick the guest, hence add a test for it.
Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
....
+int main(void)
+{
+ report_prefix_push("pgmint-loop");
+
+ lowcore.pgm_new_psw.addr = (uint64_t) pgm_int_handler;
+ /* bit 12 set is invalid */
+ lowcore.pgm_new_psw.mask = extract_psw_mask() | BIT(63 - 12);
Basically patch looks fine to me ... just an idea for an extension (but that
could also be done later):
Looking at the is_valid_psw() function in the Linux kernel sources, there
are a couple of additional condition that could cause a PGM interrupt loop
... you could maybe check them here, too, e.g. by adding a "extra_params =
-append '...'" in the unittests.cfg file to select the indiviual tests via
argv[] ?
Thomas
