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Re: [Xen-devel] [PATCH] x86: move vgc_flags to struct pv_vcpu
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 20 Dec 2019 14:39:48 +0000
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- Cc: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 20 Dec 2019 14:40:03 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 20/12/2019 13:55, Jan Beulich wrote:
> There's been effectively no use of the field for HVM.
>
> Also shrink the field to unsigned int, even if this doesn't immediately
> yield any space benefit for the structure itself. The resulting 32-bit
> padding slot can eventually be used for some other field. The change in
> size makes accesses slightly more efficient though, as no REX.W prefix
> is going to be needed anymore on the respective insns.
>
> Mirror the HVM side change here (dropping of setting the field to
> VGCF_online) also to Arm, on the assumption that it was cloned like
> this originally. VGCF_online really should simply and consistently be
> the guest view of the inverse of VPF_down, and hence needs representing
> only in the get/set vCPU context interfaces.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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