From: lantianyu1986@xxxxxxxxx <lantianyu1986@xxxxxxxxx> Sent: Saturday, February 2, 2019 5:15 AM > > 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. > > Signed-off-by: Lan Tianyu <Tianyu.Lan@xxxxxxxxxxxxx> > --- > Change since v1: > - Remove redundant extern for x2apic_phys > --- > arch/x86/kernel/cpu/mshyperv.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c > index e81a2db..4bd6d90 100644 > --- a/arch/x86/kernel/cpu/mshyperv.c > +++ b/arch/x86/kernel/cpu/mshyperv.c > @@ -328,6 +328,16 @@ static void __init ms_hyperv_init_platform(void) > # ifdef CONFIG_SMP > smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu; > # endif > + > +/* > + * 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. > + */ Per comment from Dan Carpenter on v1 of this patch, the above comment block should be indented one tab to line up with the "if" statement below. Michael > + if (IS_ENABLED(CONFIG_HYPERV_IOMMU) && x2apic_supported()) > + x2apic_phys = 1; > + > #endif > } > > -- > 2.7.4 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
