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Wed, 06 Aug 2025 02:11:30 -0700 (PDT) Received: from ubuntu-Virtual-Machine.mshome.net ([70.37.26.61]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-321612950c7sm2255568a91.31.2025.08.06.02.11.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Aug 2025 02:11:30 -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, Michael Kelley Subject: [RFC PATCH V6 1/4] x86/hyperv: Don't use hv apic driver when Secure AVIC is available Date: Wed, 6 Aug 2025 17:11:24 +0800 Message-Id: <20250806091127.441323-2-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250806091127.441323-1-ltykernel@gmail.com> References: <20250806091127.441323-1-ltykernel@gmail.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 From: Tianyu Lan 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 --- Change since RFC V3: - Update Change log and fix coding style issue. --- arch/x86/hyperv/hv_apic.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c index bfde0a3498b9..01bc02cc0590 100644 --- a/arch/x86/hyperv/hv_apic.c +++ b/arch/x86/hyperv/hv_apic.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -293,6 +294,9 @@ 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