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Re: Proposal for physical address based hypercalls
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Oct 2022 11:46:34 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 04 Oct 2022 09:46:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.10.2022 11:38, Julien Grall wrote:
> On 28/09/2022 11:38, Jan Beulich wrote:
>> Another approach would be to build in a scatter/gather model for buffers
>> right
>> away. Jürgen suggests that the low two address bits could be used as a
>> "descriptor" here.
>
> IIUC, with this approach we would still need to have a bit in the
> hypercall number to indicate this is not a virtual address. Is that correct?
Yes.
Jan
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