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

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Message-Id: <20250506130712.156583-6-ltykernel@gmail.com>
Date: Tue,  6 May 2025 09:07:10 -0400
From: Tianyu Lan <ltykernel@...il.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	Neeraj.Upadhyay@....com,
	yuehaibing@...wei.com,
	kvijayab@....com,
	jacob.jun.pan@...ux.intel.com,
	jpoimboe@...nel.org,
	tiala@...rosoft.com
Cc: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 5/6] x86/Hyper-V: Not use auto-eoi when Secure AVIC is available

From: Tianyu Lan <tiala@...rosoft.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@...rosoft.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