From: Tianyu Lan <ltykernel@gmail.com>
Date: Thu, 18 Sep 2025 15:00:21 +0000 (-0400)
Subject: x86/hyperv: Don't use auto-eoi when Secure AVIC is available
X-Git-Tag: v6.19-rc1~56^2~53
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c52c957e41e75d3f74157acffc53cefa3089ffa7;p=thirdparty%2Flinux.git

x86/hyperv: Don't use auto-eoi when Secure AVIC is available

Hyper-V doesn't support auto-eoi with Secure AVIC.
So set the HV_DEPRECATING_AEOI_RECOMMENDED flag
to force writing the EOI register after handling an interrupt.

Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index c4febdbcfe4d8..217a41b63df36 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -470,6 +470,9 @@ static void __init ms_hyperv_init_platform(void)
 
 	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;
 		pr_info("Hyper-V: running on a nested hypervisor\n");