linux-kernel - [PATCH v8 10/13] x86/xen: Bypass intr mode setup in enlighten

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Date:   Mon, 28 Aug 2017 11:20:35 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <tglx@...utronix.de>
CC:     <mingo@...nel.org>, <hpa@...or.com>, <bhe@...hat.com>,
        <rjw@...ysocki.net>, <bp@...en8.de>, <indou.takao@...fujitsu.com>,
        <izumi.taku@...fujitsu.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>,
        <xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>
Subject: [PATCH v8 10/13] x86/xen: Bypass intr mode setup in enlighten_pv system

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().

[Rewrited by Thomas Gleixner <tglx@...utronix.de>]

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
Cc: xen-devel@...ts.xenproject.org
Cc: boris.ostrovsky@...cle.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 811e4dd..07147dd 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1250,6 +1250,7 @@ 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