On Fri, Jan 02 2026 at 14:02, Mukesh Rathor wrote:
>
> +#ifndef CONFIG_X86_FRED
This #ifndef is broken. A FRED enabled kernel is no guarantee that the
CPU has FRED. So this has to be unconditional.
> + * Reserve vectors hard coded in the hypervisor. If used outside, the
> hypervisor
> + * will crash or hang or break into debugger.
> + */
> +static void hv_reserve_irq_vectors(void)
> +{
> + #define HYPERV_DBG_FASTFAIL_VECTOR 0x29
> + #define HYPERV_DBG_ASSERT_VECTOR 0x2C
> + #define HYPERV_DBG_SERVICE_VECTOR 0x2D
As FRED does not need this bit fiddling you want:
if (cpu_feature_enabled(X86_FEATURE_FRED))
return;
right here.
> + if (test_and_set_bit(HYPERV_DBG_ASSERT_VECTOR, system_vectors) ||
> + test_and_set_bit(HYPERV_DBG_SERVICE_VECTOR, system_vectors) ||
> + test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors))
> + BUG();
> +
Thanks,
tglx
