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Wed, 23 Jul 2025 12:03:16 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:73:51be:8747:b004:dd13]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b3f2fe653a7sm9513884a12.2.2025.07.23.12.03.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jul 2025 12:03:16 -0700 (PDT) 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, kvijayab@amd.com Cc: Tianyu Lan , linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH V3 4/4] x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts Date: Wed, 23 Jul 2025 15:03:08 -0400 Message-Id: <20250723190308.5945-5-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250723190308.5945-1-ltykernel@gmail.com> References: <20250723190308.5945-1-ltykernel@gmail.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tianyu Lan When Secure AVIC is enabled, call Secure AVIC function to allow Hyper-V to inject STIMER0 interrupt. 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 3d1d3547095a..591338162420 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(); } @@ -239,6 +243,9 @@ 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