linux-kernel - Re: [PATCH RFC] kvm: write protect memory after slot swap

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Message-ID: <4CC67776.809@oss.ntt.co.jp>
Date:	Tue, 26 Oct 2010 15:38:46 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Jan Kiszka <jan.kiszka@...mens.com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>, Gleb Natapov <gleb@...hat.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] kvm: write protect memory after slot swap

(2010/10/25 21:05), Michael S. Tsirkin wrote:
> On Mon, Oct 25, 2010 at 11:07:13AM +0200, Jan Kiszka wrote:
>> Cool, seems to be the key to the corruptions I've seen. Applying your
>> patch make them disappear.
>
> Yes, works for me as well.
>

I did some tests on my laptop:
   - kvm.git + mst's patch
   - qemu.git (upstream qemu)
and still got graphics curruption.


Corruption:
   On usual Desktop environment, I opened two terminals on different
   workspaces. Then as Jan did, I did "find /" loop on both of them.

   During these heavy updates, I tried to switch between these
   workspaces some times. Then, at some turn, some part of old
   workspace's images like terminals and mouse cursor remained
   in the new workspace.

   I could refresh these by moving mouse over the problematic parts.
   But without doing so, the images remained still.


Refresh is not working on virtual machines as I expect?


Thanks,
   Takuya
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