From: Gleb Natapov <gleb@redhat.com>
To: Chris Lalancette <clalance@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 07/12] Rename kvm_apic_accept_pic_intr
Date: Wed, 2 Dec 2009 18:12:49 +0200 [thread overview]
Message-ID: <20091202161249.GB20102@redhat.com> (raw)
In-Reply-To: <1259678201-11203-8-git-send-email-clalance@redhat.com>
On Tue, Dec 01, 2009 at 03:36:36PM +0100, Chris Lalancette wrote:
> Call it kvm_apic_in_virtual_wire_mode, which is more
> correct. Also change it to not only operate properly
> on the boot CPU, but on any CPU.
>
Currently it is assumed that if kvm_cpu_has_interrupt() returns true
kvm_cpu_get_interrupt() will return valid interrupt. After this change
it may not be the case any more. Suppose there are more then one vcpus
in a virtual wire mode. Pic receives interrupt and multiple cpus try
to inject it simultaneously. They all check that interrupt is pending
by calling kvm_cpu_has_interrupt() and then try to get the vector by
calling kvm_cpu_get_interrupt(). Only one vcpu will get correct value,
others will get spurious interrupt.
--
Gleb.
next prev parent reply other threads:[~2009-12-02 16:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-01 14:36 [PATCH 0/12]: Fix kdump under KVM Chris Lalancette
2009-12-01 14:36 ` [PATCH 01/12] Fix up some comments around the source tree Chris Lalancette
2009-12-01 14:36 ` [PATCH 02/12] Make kvm_pic_reset static Chris Lalancette
2009-12-01 14:36 ` [PATCH 03/12] Remove KVM_REQ_PENDING_TIMER Chris Lalancette
2009-12-01 19:04 ` Jan Kiszka
2009-12-02 4:59 ` Marcelo Tosatti
2009-12-02 12:59 ` Chris Lalancette
2009-12-02 14:16 ` Avi Kivity
2009-12-02 14:22 ` Avi Kivity
2009-12-01 14:36 ` [PATCH 04/12] IOAPIC timer interrupt redirect Chris Lalancette
2009-12-02 5:03 ` Marcelo Tosatti
2009-12-01 14:36 ` [PATCH 05/12] Make the IOAPIC lock a spinlock Chris Lalancette
2009-12-02 14:27 ` Avi Kivity
2009-12-01 14:36 ` [PATCH 06/12] Make the PIC use interrupt safe locking Chris Lalancette
2009-12-01 14:36 ` [PATCH 07/12] Rename kvm_apic_accept_pic_intr Chris Lalancette
2009-12-02 14:24 ` Avi Kivity
2009-12-02 16:12 ` Gleb Natapov [this message]
2009-12-01 14:36 ` [PATCH 08/12] Remove timer.c Chris Lalancette
2009-12-02 5:11 ` Marcelo Tosatti
2009-12-01 14:36 ` [PATCH 09/12] Fix missing spin_lock in PIT timer Chris Lalancette
2009-12-01 14:36 ` [PATCH 10/12] Inject i8254 interrupts directly from hrtimer callback Chris Lalancette
2009-12-01 14:36 ` [PATCH 11/12] Allow the PIC to signal CPUs other than BSP Chris Lalancette
2009-12-01 14:36 ` [PATCH 12/12] Kick appropriate CPUs when signalling interrupts Chris Lalancette
2009-12-02 15:44 ` Gleb Natapov
2009-12-08 10:48 ` Chris Lalancette
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