linux-kernel - Re: [PATCH v3 6/6] kvm, mem-hotplug: Reload L1's apic access page if it is migrated when L2 is running.

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Message-ID: <53D36A51.1050000@web.de>
Date:	Sat, 26 Jul 2014 10:44:01 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Tang Chen <tangchen@...fujitsu.com>, gleb@...nel.org,
	mtosatti@...hat.com, nadav.amit@...il.com
CC:	kvm@...r.kernel.org, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, guz.fnst@...fujitsu.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/6] kvm, mem-hotplug: Reload L1's apic access page
 if it is migrated when L2 is running.

On 2014-07-23 21:42, Tang Chen wrote:
> This patch only handle "L1 and L2 vm share one apic access page" situation.
> 
> When L1 vm is running, if the shared apic access page is migrated, mmu_notifier will
> request all vcpus to exit to L0, and reload apic access page physical address for
> all the vcpus' vmcs (which is done by patch 5/6). And when it enters L2 vm, L2's vmcs
> will be updated in prepare_vmcs02() called by nested_vm_run(). So we need to do
> nothing.
> 
> When L2 vm is running, if the shared apic access page is migrated, mmu_notifier will
> request all vcpus to exit to L0, and reload apic access page physical address for
> all L2 vmcs. And this patch requests apic access page reload in L2->L1 vmexit.

Shouldn't this patch come before we allow apic access page migration?

Jan



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