Re: [Xen-devel] [PATCH v12 1/9] x86: add generic resource (e.g. MSR) access hypercall

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.07.14 at 10:34, <dongxiao.xu@xxxxxxxxx> wrote:
> Add a generic resource access hypercall for tool stack or other
> components, e.g., accessing MSR, port I/O, etc.

Sigh - you're still allocating an unbounded amount of memory for
passing around the input arguments, despite it being possible (and
having been suggested) to read these from the original buffer on
each iteration. You're still not properly checking for preemption
between iterations. And you're still not making use of
continue_hypercall_on_cpu(). Plus you now silently ignore the
upper 32-bits of the passing in "idx" value as well as not
understood XEN_RESOURCE_OP_* values.

I also doubt that this warrants a new source file to be introduced,
the helper functions (if indeed needed) can very well live in
platform_hypercall.c.

Jan


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