From patchwork Mon Jul 20 12:24:17 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gleb Natapov X-Patchwork-Id: 36314 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n6KCPEsU020282 for ; Mon, 20 Jul 2009 12:25:14 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752881AbZGTMYb (ORCPT ); Mon, 20 Jul 2009 08:24:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752798AbZGTMYb (ORCPT ); Mon, 20 Jul 2009 08:24:31 -0400 Received: from mx2.redhat.com ([66.187.237.31]:52335 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751739AbZGTMYa (ORCPT ); Mon, 20 Jul 2009 08:24:30 -0400 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n6KCOLsC017756; Mon, 20 Jul 2009 08:24:21 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n6KCOKsU031307; Mon, 20 Jul 2009 08:24:20 -0400 Received: from dhcp-1-237.tlv.redhat.com (dhcp-1-237.tlv.redhat.com [10.35.1.237]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n6KCOIAU006384; Mon, 20 Jul 2009 08:24:19 -0400 Received: by dhcp-1-237.tlv.redhat.com (Postfix, from userid 13519) id D13AF18D479; Mon, 20 Jul 2009 15:24:17 +0300 (IDT) Date: Mon, 20 Jul 2009 15:24:17 +0300 From: Gleb Natapov To: Ingo Molnar Cc: Suresh Siddha , "linux-kernel@vger.kernel.org" , Sheng Yang , "kvm@vger.kernel.org" , "avi@redhat.com" Subject: [PATCH] enable x2APIC without interrupt remapping under KVM Message-ID: <20090720122417.GR5638@redhat.com> MIME-Version: 1.0 Content-Disposition: inline X-Scanned-By: MIMEDefang 2.58 on 172.16.27.26 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org KVM would like to provide x2APIC interface to a guest without emulating interrupt remapping device. The reason KVM prefers guest to use x2APIC is that x2APIC interface is better virtualizable and provides better performance than mmio xAPIC interface: - msr exits are faster than mmio (no page table walk, emulation) - no need to read back ICR to look at the busy bit - one 64 bit ICR write instead of two 32 bit writes - shared code with the Hyper-V paravirt interface Included patch changes x2APIC enabling logic to enable it even if IR initialization failed, but kernel runs under KVM and no apic id is greater than 255 (if there is one spec requires BIOS to move to x2apic mode before starting an OS). Signed-off-by: Gleb Natapov Acked-by: Suresh Siddha --- This is based on x86 tree commit ff78d570fae with Ingo comments addressed (comment formatting, print error on alloc failure, shorter error messages). -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 0a1c283..a79e8a9 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -49,6 +49,7 @@ #include #include #include +#include unsigned int num_processors; @@ -1361,52 +1362,76 @@ void enable_x2apic(void) } #endif /* CONFIG_X86_X2APIC */ -void __init enable_IR_x2apic(void) +int __init enable_IR(void) { #ifdef CONFIG_INTR_REMAP int ret; - unsigned long flags; - struct IO_APIC_route_entry **ioapic_entries = NULL; ret = dmar_table_init(); if (ret) { pr_debug("dmar_table_init() failed with %d:\n", ret); - goto ir_failed; + return 0; } if (!intr_remapping_supported()) { pr_debug("intr-remapping not supported\n"); - goto ir_failed; + return 0; } - if (!x2apic_preenabled && skip_ioapic_setup) { pr_info("Skipped enabling intr-remap because of skipping " "io-apic setup\n"); - return; + return 0; } + if (enable_intr_remapping(x2apic_supported())) + return 0; + + pr_info("Enabled Interrupt-remapping\n"); + + return 1; + +#endif + return 0; +} + +void __init enable_IR_x2apic(void) +{ + unsigned long flags; + struct IO_APIC_route_entry **ioapic_entries = NULL; + int ret, x2apic_enabled = 0; + ioapic_entries = alloc_ioapic_entries(); if (!ioapic_entries) { - pr_info("Allocate ioapic_entries failed: %d\n", ret); - goto end; + pr_err("Allocate ioapic_entries failed\n"); + goto out; } ret = save_IO_APIC_setup(ioapic_entries); if (ret) { pr_info("Saving IO-APIC state failed: %d\n", ret); - goto end; + goto out; } local_irq_save(flags); - mask_IO_APIC_setup(ioapic_entries); mask_8259A(); + mask_IO_APIC_setup(ioapic_entries); - ret = enable_intr_remapping(x2apic_supported()); - if (ret) - goto end_restore; + ret = enable_IR(); + if (!ret) { + /* IR is required if there is APIC ID > 255 even when running + * under KVM + */ + if (max_physical_apicid > 255 || !kvm_para_available()) + goto nox2apic; + /* + * without IR all CPUs can be addressed by IOAPIC/MSI + * only in physical mode + */ + x2apic_phys = 1; + } - pr_info("Enabled Interrupt-remapping\n"); + x2apic_enabled = 1; if (x2apic_supported() && !x2apic_mode) { x2apic_mode = 1; @@ -1414,41 +1439,25 @@ void __init enable_IR_x2apic(void) pr_info("Enabled x2apic\n"); } -end_restore: - if (ret) - /* - * IR enabling failed - */ +nox2apic: + if (!ret) /* IR enabling failed */ restore_IO_APIC_setup(ioapic_entries); - unmask_8259A(); local_irq_restore(flags); -end: +out: if (ioapic_entries) free_ioapic_entries(ioapic_entries); - if (!ret) + if (x2apic_enabled) return; -ir_failed: if (x2apic_preenabled) - panic("x2apic enabled by bios. But IR enabling failed"); + panic("x2apic: enabled by BIOS but kernel init failed."); else if (cpu_has_x2apic) - pr_info("Not enabling x2apic,Intr-remapping\n"); -#else - if (!cpu_has_x2apic) - return; - - if (x2apic_preenabled) - panic("x2apic enabled prior OS handover," - " enable CONFIG_X86_X2APIC, CONFIG_INTR_REMAP"); -#endif - - return; + pr_info("Not enabling x2apic, Intr-remapping init failed.\n"); } - #ifdef CONFIG_X86_64 /* * Detect and enable local APICs on non-SMP boards. diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c index bc3e880..f3b1037 100644 --- a/arch/x86/kernel/apic/probe_64.c +++ b/arch/x86/kernel/apic/probe_64.c @@ -50,11 +50,11 @@ static struct apic *apic_probe[] __initdata = { void __init default_setup_apic_routing(void) { #ifdef CONFIG_X86_X2APIC - if (x2apic_mode && (apic != &apic_x2apic_phys && + if (x2apic_mode #ifdef CONFIG_X86_UV - apic != &apic_x2apic_uv_x && + && apic != &apic_x2apic_uv_x #endif - apic != &apic_x2apic_cluster)) { + ) { if (x2apic_phys) apic = &apic_x2apic_phys; else