Avoid testing reserved bits in MSR_IA32_FLUSH_CMD. Since KVM passes through the MSR at runtime, testing reserved bits directly touches the HW and should generate #GP. However, some older CPU models like skylake with certain FMS do not generate #GP. Ideally, it could be fixed by enumerating all such CPU models. The value added is would be low. So just remove the testing loop and allow the test pass. Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx> --- x86/msr.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/x86/msr.c b/x86/msr.c index 3a041fab..76c80d29 100644 --- a/x86/msr.c +++ b/x86/msr.c @@ -302,8 +302,6 @@ static void test_cmd_msrs(void) test_wrmsr_fault(MSR_IA32_FLUSH_CMD, "FLUSH_CMD", 0); test_wrmsr_fault(MSR_IA32_FLUSH_CMD, "FLUSH_CMD", L1D_FLUSH); } - for (i = 1; i < 64; i++) - test_wrmsr_fault(MSR_IA32_FLUSH_CMD, "FLUSH_CMD", BIT_ULL(i)); } int main(int ac, char **av) base-commit: 7b0147ea57dc29ba844f5b60393a0639e55e88af -- 2.44.0.683.g7961c838ac-goog
