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Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path

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On Wed, Jun 14, 2017 at 5:40 AM, Brian Gerst <brgerst@gmail.com> wrote:
> Since tasks using IOPL are very rare, move the switching code to the slow
> path for lower impact on normal tasks.

I think that Andrew Cooper added a vmassist that we could opt in to
that makes Xen PV IOPL switching work more or less just like native.
We could maybe opt in to that and avoid needing this stuff at all on
newer hypervisors.

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[PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path Brian Gerst <brgerst@gmail.com> - 2017-06-14 14:50 +0200
  Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the  path Juergen Gross <jgross@suse.com> - 2017-06-14 15:20 +0200
    Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path Brian Gerst <brgerst@gmail.com> - 2017-06-14 19:40 +0200
      Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the  path Juergen Gross <jgross@suse.com> - 2017-06-14 19:40 +0200
  Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path Andy Lutomirski <luto@kernel.org> - 2017-06-14 19:50 +0200
    Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the  path Andrew Cooper <andrew.cooper3@citrix.com> - 2017-06-14 20:10 +0200
      Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path Brian Gerst <brgerst@gmail.com> - 2017-06-14 20:30 +0200
        Re: [PATCH 3/3] x86/xen: Move paravirt IOPL switching to slow the path Andy Lutomirski <luto@kernel.org> - 2017-06-15 03:40 +0200

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