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xen-devel
Re: [Xen-devel] Changing semantics of ioperm() on Xen x86-64?
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
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