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[PATCH v6 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system

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XEN PV overrides smp_prepare_cpus(). xen_pv_smp_prepare_cpus()
initializes interrupts in the XEN PV specific way and does not invoke
native_smp_prepare_cpus(). As a consequence, x86_init.intr_mode_init() is
not invoked either.

The invocation of x86_init.intr_mode_init() will be moved from
native_smp_prepare_cpus() in a follow up patch to solve <INSERT
REASON/PROBLEM>.

That move would cause the invocation of x86_init.intr_mode_init() for XEN
PV platforms. To prevent that, override the default x86_init.intr_mode_init()
callback with a noop().

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
---
 arch/x86/xen/enlighten_pv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index f33eef4..d3362a3 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1268,6 +1268,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
 	x86_platform.get_nmi_reason = xen_get_nmi_reason;
 
 	x86_init.resources.memory_setup = xen_memory_setup;
+	x86_init.irqs.intr_mode_init	= x86_init_noop;
 	x86_init.oem.arch_setup = xen_arch_setup;
 	x86_init.oem.banner = xen_banner;
 
-- 
2.5.5

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Thread

[PATCH v6 00/12] Unify the interrupt delivery mode and do its setup in advance Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:10 +0200
  [PATCH v6 08/12] x86/ioapic: Refactor the delay logic in timer_irq_works() Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:10 +0200
  [PATCH v6 05/12] x86/apic: Unify interrupt mode setup for SMP-capable system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:10 +0200
  [PATCH v6 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:10 +0200
  [PATCH v6 04/12] x86/apic: Move logical APIC ID away from apic_bsp_setup() Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:10 +0200
  [PATCH v6 01/12] x86/apic: Construct a selector for the interrupt delivery mode Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:20 +0200
  [PATCH v6 06/12] x86/apic: Mark the apic_intr_mode extern for sanity check cleanup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:20 +0200
  [PATCH v6 03/12] x86/apic: Split local APIC timer setup from the APIC setup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:20 +0200
  [PATCH v6 09/12] x86/init: add intr_mode_init to x86_init_ops Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-07-03 13:20 +0200

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