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Tue, 06 May 2025 06:07:18 -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, Neeraj.Upadhyay@amd.com, yuehaibing@huawei.com, kvijayab@amd.com, jacob.jun.pan@linux.intel.com, jpoimboe@kernel.org, tiala@microsoft.com Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 5/6] x86/Hyper-V: Not use auto-eoi when Secure AVIC is available Date: Tue, 6 May 2025 09:07:10 -0400 Message-Id: <20250506130712.156583-6-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250506130712.156583-1-ltykernel@gmail.com> References: <20250506130712.156583-1-ltykernel@gmail.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tianyu Lan Hyper-V doesn't support auto-eoi with Secure AVIC. So Enable HV_DEPRECATING_AEOI_RECOMMENDED flag to force to write eoi register after handling interrupt. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 3e2533954675..fbe45b5e9790 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -463,6 +463,9 @@ static void __init ms_hyperv_init_platform(void) hv_identify_partition_type(); + if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC)) + ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED; + if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) { hv_nested = true; pr_info("Hyper-V: running on a nested hypervisor\n"); -- 2.25.1