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[Xen-devel] Changing semantics of ioperm() on Xen x86-64?
| To: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Changing semantics of ioperm() on Xen x86-64? |
| From: | Anthony Liguori <aliguori@xxxxxxxxxx> |
| Date: | Tue, 18 Apr 2006 16:50:09 -0500 |
| Delivery-date: | Tue, 18 Apr 2006 14:50:35 -0700 |
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As part of the Xen x86-64 Linux port, we've changed the ioperm() syscall
to always modify the IOPL instead of actually modifying the IO bitmap in
the TSS like we do on x86-32. Is there a particular reason for doing this?
I'm completely guessing here that this may allow us to avoid changing the TR when changing from user/kernel mode but that doesn't seem like that huge of a gain. I don't expect that there are many apps that would rely on using ioperm to restrict access to only certain ranges of ports so I don't think this is a security problem but it still is a little discomforting. Comments? Regards, Anthony Liguori _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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