Re: [Xen-devel] [PATCH] hvm: Allow HVM guests to make console_io hypercall.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.09.13 at 23:17, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> The console_io hypercall is provided for PV guests and for HVM
> guests it is done via the 0xe9 port. However the PV hypercall
> is more efficient as it takes a string rather than one character
> per write.

While the change itself is fine, there are two questions arising
from me looking at do_console_io() in this context:

1) While I can see why VERBOSE ought to control access to
CONSOLEIO_write, I would think CONSOLEIO_read ought to be
constrained to the control domain in any case.

2) xsm_console_io(), like quite a few other stubs in xsm/dummy.h,
ignores its "d" parameter and uses current->domain instead. Is
that really the right way (and if so, why are there other stubs
that do honor their inputs)?

Jan


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