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From: Nivedita Singhvi <niv@us.ibm.com>
To: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Cc: xen-devel <xen-devel@lists.xensource.com>
Subject: Re: Changing semantics of ioperm() on Xen x86-64?
Date: Tue, 18 Apr 2006 16:36:20 -0700	[thread overview]
Message-ID: <444577F4.2070800@us.ibm.com> (raw)
In-Reply-To: <A95E2296287EAD4EB592B5DEEFCE0E9D4BA334@liverpoolst.ad.cl.cam.ac.uk>

Ian Pratt wrote:
>>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 don't believe so. io bitmap support was added to the hypervisor and
> the corresponding ioperm support got added on i386, but was never
> carried across to x86_64.
> 
> We would definitely benefit from someone doing a code review of x86_64
> with a view to unifying as many of the xen patches with i386 as
> possible. There's certainly some needless/unhelpful divergence.
> 
> Ian 

Above issue was caught by a LTP test case failure, btw...

thanks,
Nivedita

  reply	other threads:[~2006-04-18 23:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-18 22:53 Changing semantics of ioperm() on Xen x86-64? Ian Pratt
2006-04-18 23:36 ` Nivedita Singhvi [this message]
  -- strict thread matches above, loose matches on Subject: below --
2006-04-18 21:50 Anthony Liguori
2006-04-19  7:26 ` Keir Fraser

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