linux-kernel - Re: [PATCH v2] KVM: arm64: Get rid of userspace_irqchip_in

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Message-ID: <CAJHc60x3sGdi2_mg_9uxecPYwZMBR11m1oEKPEH4RTYaF8eHdQ@mail.gmail.com>
Date: Tue, 29 Oct 2024 10:06:09 -0700
From: Raghavendra Rao Ananta <rananta@...gle.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Oliver Upton <oliver.upton@...ux.dev>, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	stable@...r.kernel.org, syzbot <syzkaller@...glegroups.com>
Subject: Re: [PATCH v2] KVM: arm64: Get rid of userspace_irqchip_in_use

On Tue, Oct 29, 2024 at 9:27 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Mon, 28 Oct 2024 23:45:33 +0000,
> Raghavendra Rao Ananta <rananta@...gle.com> wrote:
> >
> Did you have a chance to check whether this had any negative impact on
> actual workloads? Since the entry/exit code is a bit of a hot spot,
> I'd like to make sure we're not penalising the common case (I only
> wrote this patch while waiting in an airport, and didn't test it at
> all).
>
I ran the kvm selftests, kvm-unit-tests and booted a linux guest to
test the change and noticed no failures.
Any specific test you want to try out?

> Any such data about it would be very welcome in the commit message.
>
Sure, I'll include it if we have a v3.

Thank you.
Raghavendra