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Thu, 18 Sep 2025 08:01:15 -0700 (PDT) Received: from ubuntu-Virtual-Machine.mshome.net ([70.37.26.59]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-26980302b20sm28425005ad.101.2025.09.18.08.01.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Sep 2025 08:01:07 -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 3/5] x86/hyperv: Don't use auto-eoi when Secure AVIC is available Date: Thu, 18 Sep 2025 11:00:21 -0400 Message-Id: <20250918150023.474021-4-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-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hyper-V doesn't support auto-eoi with Secure AVIC. So set the HV_DEPRECATING_AEOI_RECOMMENDED flag to force writing the EOI register after handling an interrupt. Reviewed-by: Michael Kelley Reviewed-by: Neeraj Upadhyay 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 c78f860419d6..6dd3ae66a646 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -464,6 +464,9 @@ 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