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Re: [Xen-devel] [PATCH] ptwr_emulate adjustments

To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] ptwr_emulate adjustments
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: 2007年1月16日 12:58:47 +0000
Delivery-date: 2007年1月16日 04:58:41 -0800
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On 16/1/07 12:40 pm, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
> - really only do the invalid PAE PTE fixup on write to the high part
Okay. We could theoretically get failures the other way round too I should
think but clearly the existing code doesn't handle that properly (since
it'll lose the PAGE_PRESENT forever) so it can't be something we've seen in
practise. This clarification and extra check makes sense.
> - dump guest execution state when emulation fails
We can't put anything more than XENLOG_G_WARNING on a path that a guest can
exercise at will. One option is to make show_execution_state (and hence all
underlying state-dump functions) take the dump log level as a parameter.
> - use the passed in register pointer rather than re-calculating
> guest_cpu_user_regs()
The assertion is broken and anyway really a bit overkill imo. Using regs
rather than guest_cpu_user_regs() makes sense.
 -- Keir
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
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