From: Tianyu Lan <ltyker...@gmail.com> Sent: Friday, June 13, 2025 4:08 AM
>
> From: Tianyu Lan <ti...@microsoft.com>
Suggested Subject line:
x86/hyperv: Don't use auto-eoi when Secure AVIC is available
>
> Hyper-V doesn't support auto-eoi with Secure AVIC.
> So Enable HV_DEPRECATING_AEOI_RECOMMENDED flag
> to force to write eoi register after handling
> interrupt.
Wording:
Hyper-V doesn't support auto-eoi with Secure AVIC.
So set the HV_DEPRECATING_AEOI_RECOMMENDED flag
to force writing the EIO register after handling an interrupt.
>
> Signed-off-by: Tianyu Lan <ti...@microsoft.com>
> ---
> arch/x86/kernel/cpu/mshyperv.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index c78f860419d6..8f029650f16c 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -463,6 +463,8 @@ static void __init ms_hyperv_init_platform(void)
> ms_hyperv.max_vp_index, ms_hyperv.max_lp_index);
>
> hv_identify_partition_type();
> + if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC))
> + ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED;
>
> if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) {
> hv_nested = true;
> --
> 2.25.1
>
