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xen-devel
[Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while
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To: |
Andi Kleen <andi@xxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking |
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From: |
Avi Kivity <avi@xxxxxxxxxx> |
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Date: |
Wed, 14 Sep 2011 22:26:21 +0300 |
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Cc: |
Don Zickus <dzickus@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> |
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Wed, 14 Sep 2011 12:28:21 -0700 |
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<20110907155657.GX5795@xxxxxxxxxx> <4E679AF4.50209@xxxxxxxxxx> <20110907165203.GQ6838@xxxxxxxxxx> <4E67A551.4000502@xxxxxxxxxx> <20110913184044.GN5795@xxxxxxxxxx> <20110913190320.GR7761@xxxxxxxxxxxxxxxxxx> <20110913192152.GO5795@xxxxxxxxxx> <4E7050F7.3000208@xxxxxxxxxx> <20110914144926.GU7761@xxxxxxxxxxxxxxxxxx> <4E70C1BE.7060209@xxxxxxxxxx> <20110914172838.GV7761@xxxxxxxxxxxxxxxxxx> |
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On 09/14/2011 08:28 PM, Andi Kleen wrote:
> If an NMI hits in an interrupt handler, or in the "after hlt" section
> before the write-to-last-nmi-rip, then we'll see that %rip has changed.
> If it hits after the write-to-last-nmi-rip instruction (or in the hlt
> itself), then we'll also see that %rip has changed, due to the effect of
> that instruction.
It won't handle multiple NMIs in halt. I assume that's reasonable common.
Why not?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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