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xen-devel
[Xen-devel] Re: [RFC PATCH 15/33] move segment checks to subarch
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To: |
Arjan van de Ven <arjan@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 15/33] move segment checks to subarch |
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From: |
Zachary Amsden <zach@xxxxxxxxxx> |
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Date: |
Tue, 18 Jul 2006 04:28:01 -0700 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Tue, 18 Jul 2006 04:28:26 -0700 |
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Arjan van de Ven wrote:
On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
plain text document attachment (i386-segments)
We allow for the fact that the guest kernel may not run in ring 0.
This requires some abstraction in a few places when setting %cs or
checking privilege level (user vs kernel).
- regs.xcs = __KERNEL_CS;
+ regs.xcs = get_kernel_cs();
Hi,
wouldn't this patch be simpler if __KERNEL_CS just became the macro that
currently is get_kernel_cs() for the XEN case? then code like this
doesn't need changing at all...
The tradeoff is that then you can't use __KERNEL_CS is assembler code,
and it is used in entry.S to detect NMI / debug trap workarounds - which
don't actually need to be paravirtualized, as it is easier to hide the
nasty cases which cause those side effects.
Zach
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