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Re: [Xen-devel] [PATCH] x86/hvm: Allow the guest to permit the use of userspace hypercalls

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Date: Thu, 14 Jan 2016 10:50:59 +0000
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
Delivery-date: Thu, 14 Jan 2016 11:14:15 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Mon, 2016-01-11 at 13:59 +0000, Andrew Cooper wrote:
> Arm folks: Is something like this sufficiently generic to be useful on
> Arm, perhaps with more generic naming?

ARM's HVC instruction is always invalid from userspace, i.e. it would
result in #UNDEF and there is no control bit to make it do otherwise, so I
think there isn't much point.

Ian.

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References:
- [Xen-devel] [PATCH] x86/hvm: Allow the guest to permit the use of userspace hypercalls
  - From: Andrew Cooper

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