linux-kernel - Re: [PATCH v4] enable x2APIC without interrupt remapping under KVM

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Date:	Tue, 30 Jun 2009 11:43:41 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Gleb Natapov <gleb@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"avi@...hat.com" <avi@...hat.com>
Subject: Re: [PATCH v4] enable x2APIC without interrupt remapping under KVM

2009/6/30 Gleb Natapov <gleb@...hat.com>:

>>
>> how about kexec second kernel in KVM ?
>>
>> x2apic_preenabled will be set in second kernel.
>>
> Yes, bummer. But the similar problem exist now and without KVM. After
> running x2apic enabled kernel you can't kexec kernel without x2apic
> support.

if the first kernel enable x2apic and intr_remapping, and second
kernel has x2apic and intr_remap support.
we can kexec the second kernel.

restoring to original state is not possible for kdump case.

maybe with minor change to your patch, you could kexec the in kexec
second kernel with x2apic support.

YH
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