[RFC PATCH 5/6] x86/Hyper-V: Not use auto-eoi when Secure AVIC is available

[Tianyu Lan <ltykernel@gmail.com>]

From: Tianyu Lan <tiala@microsoft.com>

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.

Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 3e2533954675..fbe45b5e9790 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -463,6 +463,9 @@ 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");
-- 
2.25.1