From: Tianyu Lan <ltyker...@gmail.com> Sent: Wednesday, July 23, 2025 12:03 PM
>
I'm nit-picking, but the patch Subject: line prefix should be "x86/hyperv:"
for consistency with past patches. Note that there's no capitalization
or dash. I know not everyone is consistent on this if you look at the git log
for mshyperv.c, but I try to flag it and encourage consistency.
> 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
>
