linux-kernel - Re: [PATCH 0/3] Remove interrupt stack table usage from x86

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Date:	Fri, 26 Dec 2008 10:15:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Remove interrupt stack table usage from x86_64
	kernel


* Avi Kivity <avi@...hat.com> wrote:

> The interrupt stack table (IST) mechanism is the only thing preventing
> kvm from deferring saving and reloading of some significant state.  It
> is also somewhat complicated.
> 
> Remove it by switching the special exceptions to use the normal irqstack.
> 
> Avi Kivity (3):
>   x86: drop the use of the tss interrupt stack table (IST)
>   x86: Remove pda.irqcount
>   x86: Switch critical exceptions and NMI to irqstack
> 
>  arch/x86/include/asm/desc.h      |   12 -----
>  arch/x86/include/asm/page_64.h   |    7 ---
>  arch/x86/include/asm/pda.h       |    2 +-
>  arch/x86/include/asm/processor.h |   11 ----
>  arch/x86/kernel/asm-offsets_64.c |    1 -
>  arch/x86/kernel/cpu/common.c     |   35 --------------
>  arch/x86/kernel/dumpstack_64.c   |   96 --------------------------------------
>  arch/x86/kernel/entry_64.S       |   49 ++++++++-----------
>  arch/x86/kernel/traps.c          |   12 ++--
>  9 files changed, 27 insertions(+), 198 deletions(-)

looks good. Please base your work on the tip/master tree, we have a ton of 
pending (and conflicting) changes in the lowlevel assembly area:

  http://people.redhat.com/mingo/tip.git/README

	Ingo
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