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Mon, 04 Aug 2025 11:05:32 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:6f:2b47:96b8:6281:35ea]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-241e8aafb34sm114144825ad.173.2025.08.04.11.05.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Aug 2025 11:05:32 -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 V5 3/4] x86/hyperv: Don't use auto-eoi when Secure AVIC is available Date: Mon, 4 Aug 2025 14:05:24 -0400 Message-Id: <20250804180525.32658-4-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250804180525.32658-1-ltykernel@gmail.com> References: <20250804180525.32658-1-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: quoted-printable Content-Type: text/plain; charset="utf-8" From: Tianyu Lan 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 Signed-off-by: Tianyu Lan --- Change since RFC V3: - Update title prefix from "x86/Hyper-V" to "x86/hyperv" --- arch/x86/kernel/cpu/mshyperv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index c78f860419d6..8f029650f16c 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -463,6 +463,8 @@ static void __init ms_hyperv_init_platform(void) ms_hyperv.max_vp_index, ms_hyperv.max_lp_index); =20 hv_identify_partition_type(); + if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC)) + ms_hyperv.hints |=3D HV_DEPRECATING_AEOI_RECOMMENDED; =20 if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) { hv_nested =3D true; --=20 2.25.1