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Re: [Xen-devel] [PATCH v1] x86/altp2m: Add hypercall to create a new view and set sve bits
- To: Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Julien Grall <Julien.Grall@xxxxxxx>
- Date: Thu, 5 Sep 2019 08:02:56 +0000
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- Thread-topic: [PATCH v1] x86/altp2m: Add hypercall to create a new view and set sve bits
Hi,
On 02/09/2019 09:11, Alexandru Stefan ISAILA wrote:
> By default the sve bits are not set.
While altp2m is currently only supported for x86 (though I am aware of
some port for Arm), this patch extends an interface that is meant to be
arch-agnostic. So what does "sve" stands for?
> diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
> index c6cd12f596..924d947e78 100644
> --- a/xen/include/public/hvm/hvm_op.h
> +++ b/xen/include/public/hvm/hvm_op.h
> @@ -244,6 +244,7 @@ struct xen_hvm_altp2m_view {
> /* Create view only: default access type
> * NOTE: currently ignored */
> uint16_t hvmmem_default_access; /* xenmem_access_t */
> + uint8_t set_sve; /* bool value */
Do we expect more "default" to be override? It might be worth
considering to introduce flags rather than waste 8-bits per new default
that can be encoded in 1-bit.
Cheers
--
Julien Grall
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