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Date: Thu, 3 Jul 2014 09:19:21 +0800 From: Tang Chen <tangchen@...fujitsu.com> To: Gleb Natapov <gleb@...nel.org> CC: <mtosatti@...hat.com>, <kvm@...r.kernel.org>, <laijs@...fujitsu.com>, <isimatu.yasuaki@...fujitsu.com>, <guz.fnst@...fujitsu.com>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 3/4] kvm, memory-hotplug: Update ept identity pagetable when it is migrated. On 07/03/2014 12:34 AM, Gleb Natapov wrote: > On Wed, Jul 02, 2014 at 05:00:36PM +0800, Tang Chen wrote: >> ept identity pagetable is pinned in memory, and as a result it cannot be >> migrated/hot-removed. >> >> But actually it doesn't need to be pinned in memory. >> >> This patch introduces a new vcpu request: KVM_REQ_MIGRATE_EPT to reset ept >> indetity pagetable related variable. This request will be made when >> kvm_mmu_notifier_invalidate_page() is called when the page is unmapped >> from the qemu user space to reset kvm->arch.ept_identity_pagetable to NULL. >> And will also be made when ept violation happens to reset >> kvm->arch.ept_identity_pagetable to the new page. > > kvm->arch.ept_identity_pagetable is never used as a page address, just > boolean null/!null to see if identity pagetable is initialized. I do > not see why would we want to track its address at all. Changing it to bool > and assigning true during initialization should be enough. OK, followed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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