Re: [PATCH] kvm: Fix page ageing bugs

From: Rik van Riel
Date: Mon Sep 22 2014 - 16:24:06 EST


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On 09/22/2014 03:57 PM, Andres Lagar-Cavilla wrote:
> 1. We were calling clear_flush_young_notify in unmap_one, but we
> are within an mmu notifier invalidate range scope. The spte exists
> no more (due to range_start) and the accessed bit info has already
> been propagated (due to kvm_pfn_set_accessed). Simply call
> clear_flush_young.
>
> 2. We clear_flush_young on a primary MMU PMD, but this may be
> mapped as a collection of PTEs by the secondary MMU (e.g. during
> log-dirty). This required expanding the interface of the
> clear_flush_young mmu notifier, so a lot of code has been trivially
> touched.
>
> 3. In the absence of shadow_accessed_mask (e.g. EPT A bit), we
> emulate the access bit by blowing the spte. This requires proper
> synchronizing with MMU notifier consumers, like every other removal
> of spte's does.

Acked-by: Rik van Riel <riel@xxxxxxxxxx>


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