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Thu, 18 Sep 2025 08:01:16 -0700 (PDT) From: Tianyu Lan X-Google-Original-From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, Neeraj.Upadhyay@amd.com, tiala@microsoft.com, kvijayab@amd.com, romank@linux.microsoft.com Cc: linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Kelley Subject: [PATCH 4/5] x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts Date: Thu, 18 Sep 2025 11:00:22 -0400 Message-Id: <20250918150023.474021-5-tiala@microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250918150023.474021-1-tiala@microsoft.com> References: <20250918150023.474021-1-tiala@microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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 afdbda2dd7b7..a38bb96c9f5e 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -133,6 +133,10 @@ 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(); } @@ -240,6 +244,9 @@ 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]) { -- 2.25.1