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[89.65.217.23]) by smtp.gmail.com with ESMTPSA id f19sm370341lfm.119.2021.12.10.09.40.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Dec 2021 09:40:51 -0800 (PST) From: Bartlomiej Zolnierkiewicz To: kernel-team@lists.ubuntu.com Subject: [SRU][bionic/azure-4.15][PATCH 3/5] x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available Date: Fri, 10 Dec 2021 18:40:43 +0100 Message-Id: <20211210174045.23800-4-bartlomiej.zolnierkiewicz@canonical.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211210174045.23800-1-bartlomiej.zolnierkiewicz@canonical.com> References: <20211210174045.23800-1-bartlomiej.zolnierkiewicz@canonical.com> MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Lan Tianyu BugLink: https://bugs.launchpad.net/bugs/1951924 Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic, set x2apic destination mode to physcial mode when x2apic is available and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs have 8-bit APIC id. Reviewed-by: Thomas Gleixner Reviewed-by: Michael Kelley Signed-off-by: Lan Tianyu Signed-off-by: Joerg Roedel (backported from 84fdfafab849036b5aefa52824b5cb42e887ef0e) Signed-off-by: Bartlomiej Zolnierkiewicz --- arch/x86/kernel/cpu/mshyperv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 89d86ff64b6f..d603867bf251 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -324,6 +324,18 @@ static void __init ms_hyperv_init_platform(void) if (ms_hyperv.misc_features & HV_X64_STIMER_DIRECT_MODE_AVAILABLE) alloc_intr_gate(HYPERV_STIMER0_VECTOR, hv_stimer0_callback_vector); + + /* + * Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic, + * set x2apic destination mode to physcial mode when x2apic is available + * and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs + * have 8-bit APIC id. + */ +# ifdef CONFIG_X86_X2APIC + if (x2apic_supported()) + x2apic_phys = 1; +# endif + #endif }