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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Zhang, Yang Z" <yang.z.zhang@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH] KVM: x86: always exit on EOIs for interrupts listed in the IOAPIC redir table
Date: Thu, 07 Aug 2014 08:13:24 +0200	[thread overview]
Message-ID: <53E31904.9040909@redhat.com> (raw)
In-Reply-To: <A9667DDFB95DB7438FA9D7D576C3D87E0AB5264D@SHSMSX104.ccr.corp.intel.com>

Il 07/08/2014 03:31, Zhang, Yang Z ha scritto:
> Let me give an example to see whether my concern is a real problem: 
> Guest allocates a vector and set it in IOAPIC entry to deliver
> interrupt. Later it masks the IOAPIC entry(means stop the
> corresponding device) and assign this vector to a MSI device. With
> this patch, even the vector is not used by IOAPIC, but it still set
> eoi exit bitmap unconditionally. The subsequent EOIs to MSI device
> will force vmexit. Could this happen?

Yes, I guess it could.  I'm not sure whether it could on Linux or Windows.

> I think the right fixing is to check the ISR plus TMR to construct
> the eoi exit bitmap.

Do you care enough to propose a patch? :)

Paolo

  reply	other threads:[~2014-08-07  6:13 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-30 16:12 [PATCH] KVM: x86: always exit on EOIs for interrupts listed in the IOAPIC redir table Paolo Bonzini
2014-07-30 16:51 ` Alex Williamson
2014-08-06 14:03 ` Zhang, Yang Z
2014-08-06 14:08   ` Paolo Bonzini
2014-08-07  1:31     ` Zhang, Yang Z
2014-08-07  6:13       ` Paolo Bonzini [this message]
2014-08-07  6:17         ` Zhang, Yang Z

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