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[Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking
- To: Andi Kleen <andi@xxxxxxxxxxxxxx>
- From: Avi Kivity <avi@xxxxxxxxxx>
- Date: Wed, 14 Sep 2011 22:26:21 +0300
- 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>
- Delivery-date: Wed, 14 Sep 2011 12:28:21 -0700
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
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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