From 5e52db91d112bd1da00b520e21f570db14105bde Mon Sep 17 00:00:00 2001 From: Tianyu Lan Date: Thu, 18 Sep 2025 11:00:22 -0400 Subject: [PATCH] x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts When Secure AVIC is enabled, call Secure AVIC function to allow Hyper-V to inject STIMER0 interrupt. Reviewed-by: Neeraj Upadhyay Reviewed-by: Michael Kelley Signed-off-by: Tianyu Lan Signed-off-by: Wei Liu --- arch/x86/hyperv/hv_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index e890fd37e9c2d..21ed8963fafd3 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -170,6 +170,10 @@ 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(); } @@ -277,6 +281,9 @@ static int hv_cpu_die(unsigned int cpu) *ghcb_va = NULL; } + if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE) + apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, false); + hv_common_cpu_die(cpu); if (hv_vp_assist_page && hv_vp_assist_page[cpu]) { -- 2.47.3