[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation |
Date: |
Wed, 07 Dec 2011 12:29:11 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0 |
On 10/17/2011 06:00 PM, Lai Jiangshan wrote:
> From: Lai Jiangshan <address@hidden>
>
> Currently, NMI interrupt is blindly sent to all the vCPUs when NMI
> button event happens. This doesn't properly emulate real hardware on
> which NMI button event triggers LINT1. Because of this, NMI is sent to
> the processor even when LINT1 is maskied in LVT. For example, this
> causes the problem that kdump initiated by NMI sometimes doesn't work
> on KVM, because kdump assumes NMI is masked on CPUs other than CPU0.
>
> With this patch, inject-nmi request is handled as follows.
>
> - When in-kernel irqchip is disabled, deliver LINT1 instead of NMI
> interrupt.
> - When in-kernel irqchip is enabled, get the in-kernel LAPIC states
> and test the APIC_LVT_MASKED, if LINT1 is unmasked, and then
> delivering the NMI directly. (Suggested by Jan Kiszka)
>
> Changed from old version:
> re-implement it by the Jan's suggestion.
> fix the race found by Jan.
This patch fell through the cracks, sorry. Now applied.
Sasha, this patch highlights the issues with KVM_NMI.
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation,
Avi Kivity <=