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Re: [Xen-devel] [PATCH] vmx: correct EIP value of task-state segment

To: Kouya Shimura <kouya@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] vmx: correct EIP value of task-state segment
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 31 Jul 2009 08:36:42 +0100
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On 31/07/2009 02:19, "Kouya Shimura" <kouya@xxxxxxxxxxxxxx> wrote:

> Major OSes(Linux, windows, ...) don't seem to use task switching.
> So this bug is missed.
> Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

What about SVM, and what if the reason for the task switch is a hardware
interrupt or exception (the only case we care about for Windows at least)?

The reference manuals are sketchy enough you may need to test out some task
switches on SVM and VMX hardware to make sure you make patches that really
do the right thing.

 -- Keir

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