linux-kernel - Re: [PATCH v2 0/2] x86/xen: simplify irq pvops

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Date:   Wed, 22 Sep 2021 14:46:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Deep Shah <sdeep@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>
Subject: Re: [PATCH v2 0/2] x86/xen: simplify irq pvops

On Wed, Sep 22, 2021 at 12:31:00PM +0200, Juergen Gross wrote:
> The pvops function for Xen PV guests handling the interrupt flag are
> much more complex than needed.
> 
> With the supported Xen hypervisor versions they can be simplified a
> lot, especially by removing the need for disabling preemption.
> 
> Juergen Gross (2):
>   x86/xen: remove xen_have_vcpu_info_placement flag
>   x86/xen: switch initial pvops IRQ functions to dummy ones
> 
>  arch/x86/include/asm/paravirt_types.h |   2 +
>  arch/x86/kernel/paravirt.c            |  13 ++-
>  arch/x86/xen/enlighten.c              | 116 ++++++--------------------
>  arch/x86/xen/enlighten_hvm.c          |   6 +-
>  arch/x86/xen/enlighten_pv.c           |  28 ++-----
>  arch/x86/xen/irq.c                    |  61 +-------------
>  arch/x86/xen/smp.c                    |  24 ------
>  arch/x86/xen/xen-ops.h                |   4 +-
>  8 files changed, 53 insertions(+), 201 deletions(-)

That looks awesome, I'm totally in favour of deleting code :-)

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>