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| author | Lan Tianyu <Tianyu.Lan@microsoft.com> | 2019-02-27 17:54:03 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-02-28 13:12:16 +0300 |
| commit | 84fdfafab849036b5aefa52824b5cb42e887ef0e (patch) | |
| tree | 5824cdcb8b5e6a452042eefb2c987c7df8e7828d | |
| parent | 5908e6b738e3357af42c10e1183753c70a0117a9 (diff) | |
| download | linux-84fdfafab849036b5aefa52824b5cb42e887ef0e.tar.xz | |
x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available
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 <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index e81a2db42df7..3fa238a137d2 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -328,6 +328,18 @@ 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. + */ +# ifdef CONFIG_X86_X2APIC + if (x2apic_supported()) + x2apic_phys = 1; +# endif + #endif } |