Re: [Xen-devel] [PATCH 3/5] x86/hvm: Make HVM_PARAM_{STORE, CONSOLE}_EVTCHN read-only to the guest

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Sep 05, 2018 at 07:12:02PM +0100, Andrew Cooper wrote:
> These values are set by the toolstack for each create/restore operation, and
> bound by xen{store,console}d before the the guest starts running.
> 
> A guest has no reason to modify them at all, and the matching *_PFN parameters
> are already read-only.  Adjust the *_EVTCHN permissions to be consistent.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Oh, that answers one of my questions in the previous patch :)

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

I wonder however if such parameters being writable was part of the
public ABI, since it's exposed to guests and now we are changing the
behavior.

Thanks, Roger.

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