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Message-ID: <0e0b1859-e7f8-3f8d-2be8-e0069b116525@suse.com> Date: Tue, 23 Aug 2022 13:56:22 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Jane Malalane From: Jan Beulich Subject: [PATCH] x86/PVH: restore VMX APIC assist for Dom0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR3P281CA0016.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1d::21) To VE1PR04MB6560.eurprd04.prod.outlook.com (2603:10a6:803:122::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a82e9015-fb5b-406e-0a76-08da84fe804a X-MS-TrafficTypeDiagnostic: PA4PR04MB7981:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:VE1PR04MB6560.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(396003)(366004)(376002)(346002)(136003)(39860400002)(2616005)(4326008)(86362001)(66556008)(8676002)(66946007)(31686004)(31696002)(6916009)(54906003)(66476007)(36756003)(38100700002)(26005)(8936002)(6512007)(41300700001)(186003)(6506007)(6486002)(478600001)(316002)(83380400001)(2906002)(5660300002)(43740500002)(45980500001);DIR:OUT;SFP:1101; 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charset="utf-8" I don't expect it was intended to default PVH Dom0 to "no assist" mode. Introduce command line (sub-)options allowing to suppress enabling of the assists, paralleling the guest config settings for DomU, but restore the defaulting to "enabled". Fixes: 2ce11ce249a3 ("x86/HVM: allow per-domain usage of hardware virtualiz= ed APIC") Signed-off-by: Jan Beulich --- Besides the issue caused here (the manifestation of which appears to correlate with the other fallout Andrew is trying to deal with) I'm observing further warnings, but I guess these have been there for some time (perhaps forever): When parsing AML and encountering the objects describing the CPUs, Linux would find entries with the original APIC IDs. If those don't match the ones we assign in pvh_setup_acpi_madt(), the kernel will wrongly consider the entries to describe further CPUs, which it therefore would deem hot-pluggable. This again results in warnings, this time "NR_CPUS/possible_cpus limit of ... reached". --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -753,7 +753,8 @@ Specify the bit width of the DMA heap. =20 ### dom0 =3D List of [ pv | pvh, shadow=3D, verbose=3D, - cpuid-faulting=3D, msr-relaxed=3D ] + cpuid-faulting=3D, msr-relaxed=3D, + assisted-xapic=3D, assisted-x2apic=3D ] =20 Applicability: x86 =20 @@ -814,6 +815,10 @@ Controls for how dom0 is constructed on =20 If using this option is necessary to fix an issue, please report a bug. =20 +* The `assisted-xapic` and `assisted-x2apic` options, defaulting to true, + allow disabling of the respective hardware assists. These are applica= ble + to PVH Dom0 only, and their effect is limited to VT-x. + ### dom0-cpuid =3D List of comma separated booleans =20 --- a/xen/arch/x86/dom0_build.c +++ b/xen/arch/x86/dom0_build.c @@ -293,6 +293,12 @@ static int __init cf_check parse_dom0_pa opt_dom0_cpuid_faulting =3D val; else if ( (val =3D parse_boolean("msr-relaxed", s, ss)) >=3D 0 ) opt_dom0_msr_relaxed =3D val; +#ifdef CONFIG_HVM + else if ( (val =3D parse_boolean("assisted-xapic", s, ss)) >=3D 0 ) + opt_dom0_assisted_xapic =3D val; + else if ( (val =3D parse_boolean("assisted-x2apic", s, ss)) >=3D 0= ) + opt_dom0_assisted_x2apic =3D val; +#endif else rc =3D -EINVAL; =20 --- a/xen/arch/x86/hvm/dom0_build.c +++ b/xen/arch/x86/hvm/dom0_build.c @@ -55,6 +55,9 @@ */ #define HVM_VM86_TSS_SIZE 265 =20 +bool __initdata opt_dom0_assisted_xapic =3D true; +bool __initdata opt_dom0_assisted_x2apic =3D true; + static unsigned int __initdata acpi_intr_overrides; static struct acpi_madt_interrupt_override __initdata *intsrcovr; =20 --- a/xen/arch/x86/include/asm/setup.h +++ b/xen/arch/x86/include/asm/setup.h @@ -68,6 +68,14 @@ extern bool opt_dom0_verbose; extern bool opt_dom0_cpuid_faulting; extern bool opt_dom0_msr_relaxed; =20 +#ifdef CONFIG_HVM +extern bool opt_dom0_assisted_xapic; +extern bool opt_dom0_assisted_x2apic; +#else +#define opt_dom0_assisted_xapic false +#define opt_dom0_assisted_x2apic false +#endif + #define max_init_domid (0) =20 #endif --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -784,6 +784,11 @@ static struct domain *__init create_dom0 =20 dom0_cfg.arch.emulation_flags |=3D XEN_X86_EMU_LAPIC | XEN_X86_EMU_IOAPIC | XEN_X86_EMU_VPCI; + + if ( opt_dom0_assisted_xapic ) + dom0_cfg.arch.misc_flags |=3D XEN_X86_ASSISTED_XAPIC; + if ( opt_dom0_assisted_x2apic ) + dom0_cfg.arch.misc_flags |=3D XEN_X86_ASSISTED_X2APIC; } =20 if ( iommu_enabled )