Re: Re-enabling xsave

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Nov 07, 2017 at 08:06:21PM +0000, coypu%sdf.org@localhost wrote:
> Hi,
> 
> Due to XSA-52 which was a vulnerability in Xen's implementation of fpu
> switching on AMD CPU, they made it possible to disable support for
> XSAVE. This resulted in SIGILL for anyone using XSAVE.
> 
> This was Xen ~4.1. They have since fixed this issue.
> 
> as a stopgap measure, netbsd/xen avoids using XSAVE since, which is a
> shame.
> 
> OK for reverting this stopgap measure?

Not sure if such old Xen is not still in use around ...
It there a way to make this conditional on the hypervisor version ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--