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Re: [Xen-devel] [PATCH] xen: report PV capability in sysctl and use it in toolstack
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 8 Nov 2018 18:29:05 +0000
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- Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Thu, 08 Nov 2018 18:29:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 08/11/18 18:08, Wei Liu wrote:
> 0e2c886ef ("xen: decouple HVM and IOMMU capabilities") provided a
> truth table for what `xl info` would report. In order to make the
> table work xen will need to report its PV capability.
>
> Replace cap_directio with cap_pv in libxl IDL. It is safe to do so
> because cap_directio has never been released. Revert to use
> cap_hvm_directio to mark the availability of IOMMU, to save us from
> providing a compatibility layer.
>
> Don't bump sysctl version number because we've already done so.
>
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
In principle, I think this is fine. However, some observations.
Looking more closely at the matrix, we've got:
pv hvm iommu flags in xl info
0 0 x n/a
0 1 0 hvm
0 1 1 hvm hvm_directio
1 0 0 NIL
1 0 1 directio
1 1 0 hvm
1 1 1 hvm hvm_directio directio
Wouldn't it make more sense to have pv and pv_directio, even if only as
the end user visible string?
> diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
> index 3b8f967651..41babb329e 100644
> --- a/tools/libxl/libxl_types.idl
> +++ b/tools/libxl/libxl_types.idl
> @@ -1013,8 +1013,8 @@ libxl_physinfo = Struct("physinfo", [
> ("hw_cap", libxl_hwcap),
>
> ("cap_hvm", bool),
> + ("cap_pv", bool),
> ("cap_hvm_directio", bool),
Is it worth noting "# No longer HVM specific" here?
~Andrew
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