diff options
Diffstat (limited to 'tools/testing/selftests/kvm')
| -rw-r--r-- | tools/testing/selftests/kvm/s390x/sync_regs_test.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c index d5290b4ad636..b705637ca14b 100644 --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c @@ -25,12 +25,15 @@ static void guest_code(void) { - register u64 stage asm("11") = 0; - - for (;;) { - GUEST_SYNC(0); - asm volatile ("ahi %0,1" : : "r"(stage)); - } + /* + * We embed diag 501 here instead of doing a ucall to avoid that + * the compiler has messed with r11 at the time of the ucall. + */ + asm volatile ( + "0: diag 0,0,0x501\n" + " ahi 11,1\n" + " j 0b\n" + ); } #define REG_COMPARE(reg) \ |