linux-kernel - [RFC Patch v2 4/4] x86/Hyper-V: Allow Hyper-V to inject Hyper-V vectors

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Message-Id: <20250613110829.122371-5-ltykernel@gmail.com>
Date: Fri, 13 Jun 2025 07:08:29 -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,
	kvijayab@....com,
	Neeraj.Upadhyay@....com
Cc: Tianyu Lan <tiala@...rosoft.com>,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC Patch v2 4/4] x86/Hyper-V: Allow Hyper-V to inject Hyper-V vectors

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

When Secure AVIC is enabled, call Secure AVIC
function to allow Hyper-V to inject STIMER0 interrupt.

Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
 arch/x86/hyperv/hv_init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 3d1d3547095a..3b99fffb9ffd 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -132,6 +132,10 @@ static int hv_cpu_init(unsigned int cpu)
 		wrmsrq(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64);
 	}
 
+	/* Allow Hyper-V stimer vector to be injected from Hypervisor. */
+	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
+		apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, true);
+
 	return hyperv_init_ghcb();
 }
 
-- 
2.25.1