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From: Marcelo Tosatti <mtosatti@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Avi Kivity <avi@redhat.com>, kvm <kvm@vger.kernel.org>,
	"Roedel, Joerg" <Joerg.Roedel@amd.com>,
	Gleb Natapov <gleb@redhat.com>
Subject: Re: [PATCH] KVM: SVM: Keep intercepting task switching with NPT enabled
Date: Thu, 27 Oct 2011 10:40:58 -0200	[thread overview]
Message-ID: <20111027124058.GE29646@amt.cnet> (raw)
In-Reply-To: <4E9DA7EF.30804@siemens.com>

On Tue, Oct 18, 2011 at 06:23:11PM +0200, Jan Kiszka wrote:
> AMD processors apparently have a bug in the hardware task switching
> support when NPT is enabled. If the task switch triggers a NPF, we can
> get wrong EXITINTINFO along with that fault. On resume, spurious
> exceptions may then be injected into the guest.
> 
> We were able to reproduce this bug when our guest triggered #SS and the
> handler were supposed to run over a separate task with not yet touched
> stack pages.
> 
> Work around the issue by continuing to emulate task switches even in
> NPT mode.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>  arch/x86/kvm/svm.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)

Applied, thanks.


      parent reply	other threads:[~2011-10-27 12:43 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-18 16:23 [PATCH] KVM: SVM: Keep intercepting task switching with NPT enabled Jan Kiszka
2011-10-18 16:35 ` Roedel, Joerg
2011-10-18 17:37   ` Avi Kivity
2011-10-19 14:12     ` Roedel, Joerg
2011-11-01 11:13     ` Roedel, Joerg
2011-11-01 13:39       ` Jan Kiszka
2011-11-01 15:30         ` Roedel, Joerg
2011-11-01 15:49           ` Jan Kiszka
2011-11-01 16:15             ` Roedel, Joerg
2011-11-01 18:22               ` Jan Kiszka
2011-11-02  9:55                 ` Roedel, Joerg
2011-11-02  9:59                   ` Jan Kiszka
2011-11-02 10:04                   ` Avi Kivity
2011-10-27 12:40 ` Marcelo Tosatti [this message]

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