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[PATCH v10 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 the dump-capture
kernel hangs, if there is a notsc option in its command line.

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().

[Rewritten by Thomas Gleixner <tglx@linutronix.de>]

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: xen-devel@lists.xenproject.org
Cc: boris.ostrovsky@oracle.com
Cc: Juergen Gross <jgross@suse.com>
---
V10 --> V9:
 --Modify the changelog, suggested by Juergen
 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 ae2a2e2..934dc7f 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1232,6 +1232,7 @@ 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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[PATCH v9 00/12] Unify the interrupt delivery mode and do its setup in advance Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 12/12] x86/apic: Remove the init_bsp_APIC() Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
    Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in  enlighten_pv system Juergen Gross <jgross@suse.com> - 2017-09-13 11:50 +0200
      Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in  enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 12:10 +0200
    [PATCH v10 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 12:30 +0200
  [PATCH v9 03/12] x86/apic: Split local APIC timer setup from the APIC setup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 11/12] x86/time: Initialize interrupt mode behind timer init Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 02/12] x86/apic: Prepare for unifying the interrupt delivery modes setup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 09/12] x86/init: add intr_mode_init to x86_init_ops Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 05/12] x86/apic: Unify interrupt mode setup for SMP-capable system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 06/12] x86/apic: Mark the apic_intr_mode extern for sanity check cleanup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200

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