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Thu, 18 Sep 2025 08:01:04 -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 1/5] x86/hyperv: Don't use hv apic driver when Secure AVIC is available Date: Thu, 18 Sep 2025 11:00:19 -0400 Message-Id: <20250918150023.474021-2-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 available, the AMD x2apic Secure AVIC driver will be selected. In that case, have hv_apic_init() return immediately without doing anything. Reviewed-by: Michael Kelley Reviewed-by: Neeraj Upadhyay Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_apic.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c index bfde0a3498b9..e669053b637d 100644 --- a/arch/x86/hyperv/hv_apic.c +++ b/arch/x86/hyperv/hv_apic.c @@ -293,6 +293,9 @@ static void hv_send_ipi_self(int vector) void __init hv_apic_init(void) { + if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC)) + return; + if (ms_hyperv.hints & HV_X64_CLUSTER_IPI_RECOMMENDED) { pr_info("Hyper-V: Using IPI hypercalls\n"); /* -- 2.25.1