From: Andi Kleen <andi@firstfloor.org>
To: Avi Kivity <avi@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
x86@kernel.org, linux-kernel <linux-kernel@vger.kernel.org>,
KVM list <kvm@vger.kernel.org>
Subject: Re: [PATCH 0/3] Remove interrupt stack table usage from x86_64 kernel
Date: Sun, 28 Dec 2008 20:30:46 +0100 [thread overview]
Message-ID: <20081228193046.GE496@one.firstfloor.org> (raw)
In-Reply-To: <4957CE78.6030706@redhat.com>
> One fatal problem is enough -- I don't thing that patch can be made to
> work. Pity since it did clean up some stuff.
Not sure that was true anyways.
> I would like however to speed up kvm. Here's a plan:
>
> 1. Add per-cpu IDT
You don't need that, do you? Just two sets.
> 2. When switching to the guest TR (and other state), switch off IST use
> in the current IDT
> 3. When switching away from the kvm task, restore the IST entries
>
> per-cpu IDT would cost around 4K per cpu. I propose to make it
> kconfigurable, and have kvm select it.
If anything please make it runtime switchable and disable it on Intel
CPUs.
-Andi
--
ak@linux.intel.com
prev parent reply other threads:[~2008-12-28 19:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-25 20:58 [PATCH 0/3] Remove interrupt stack table usage from x86_64 kernel Avi Kivity
2008-12-25 20:58 ` [PATCH 1/3] x86: drop the use of the tss interrupt stack table (IST) Avi Kivity
2008-12-25 20:58 ` [PATCH 2/3] x86: Remove pda.irqcount Avi Kivity
2008-12-25 20:58 ` [PATCH 3/3] x86: Switch critical exceptions and NMI to irqstack Avi Kivity
2008-12-26 9:15 ` [PATCH 0/3] Remove interrupt stack table usage from x86_64 kernel Ingo Molnar
[not found] ` <87vdt5vfxc.fsf@basil.nowhere.org>
[not found] ` <4956A0B1.1060908@redhat.com>
[not found] ` <20081227224029.GB496@one.firstfloor.org>
[not found] ` <49573FE7.9090802@redhat.com>
[not found] ` <20081228131605.GC496@one.firstfloor.org>
2008-12-28 14:09 ` Avi Kivity
2008-12-28 19:08 ` Andi Kleen
2008-12-28 19:07 ` Avi Kivity
2008-12-28 19:19 ` Avi Kivity
2008-12-28 20:08 ` Avi Kivity
2008-12-28 20:34 ` Andi Kleen
2008-12-28 20:28 ` Avi Kivity
2008-12-28 19:30 ` Andi Kleen [this message]
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