From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org,
"Prasanna Panchamukhi" <panchamukhi@arista.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Borislav Petkov" <bp@alien8.de>,
"Cathy Avery" <cavery@redhat.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Ingo Molnar" <mingo@redhat.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
"Mohammed Gamal" <mmorsy@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Roman Kagan" <rkagan@virtuozzo.com>,
"Sasha Levin" <sashal@kernel.org>,
"Stephen Hemminger" <sthemmin@microsoft.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
devel@linuxdriverproject.org, kvm@vger.kernel.org,
linux-hyperv@vger.kernel.org, x86@kernel.org,
"Dmitry Safonov" <dima@arista.com>
Subject: Re: [PATCH] x86/hyperv: Disable preemption while setting reenlightenment vector
Date: Fri, 14 Jun 2019 23:44:36 +0200 [thread overview]
Message-ID: <87pnnf6dvf.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20190614122726.GL3436@hirez.programming.kicks-ass.net>
Peter Zijlstra <peterz@infradead.org> writes:
>
> I know you probably can't change the HV interface, but I'm thinking its
> rather daft you have to specify a CPU at all for this. The HV can just
> pick one and send the notification there, who cares.
Generally speaking, hypervisor can't know if the CPU is offline (or
e.g. 'isolated') from guest's perspective so I think having an option to
specify affinity for reenlightenment notification is rather a good
thing, not bad.
(Actually, I don't remember if I tried specifying 'HV_ANY' (U32_MAX-1)
here to see what happens. But then I doubt it'll notice the fact that we
offlined some CPU so we may get a totally unexpected IRQ there).
--
Vitaly
next prev parent reply other threads:[~2019-06-14 21:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-11 21:20 [PATCH] x86/hyperv: Disable preemption while setting reenlightenment vector Dmitry Safonov
2019-06-12 9:35 ` Peter Zijlstra
2019-06-12 10:25 ` Vitaly Kuznetsov
2019-06-12 10:17 ` Vitaly Kuznetsov
2019-06-13 19:00 ` Thomas Gleixner
2019-06-14 8:06 ` Vitaly Kuznetsov
2019-06-14 8:28 ` Peter Zijlstra
2019-06-14 10:08 ` Vitaly Kuznetsov
2019-06-14 11:50 ` Dmitry Safonov
2019-06-14 12:27 ` Peter Zijlstra
2019-06-14 14:28 ` Dmitry Safonov
2019-06-14 21:44 ` Vitaly Kuznetsov [this message]
2019-06-14 21:36 ` Vitaly Kuznetsov
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