From: Avi Kivity <avi@qumranet.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: Oops for sale
Date: Mon, 09 Jun 2008 19:33:19 +0300 [thread overview]
Message-ID: <484D5B4F.3080300@qumranet.com> (raw)
In-Reply-To: <484D3310.6070908@redhat.com>
Gerd Hoffmann wrote:
> Log attached. Scanning it and having a brief look at the source code
> makes me suspect it could be a flags update triggering this: Due to
> 64bit xen guest kernels running in ring3 xenner may just flip the user
> bit (off->on) in the page table handler, which is a unusual operation I
> guess ...
>
The unshadow-on-userspace-access heuristic is broken. Since it is also
bad for Xenner, try removing the following lines:
spte |= PT_WRITABLE_MASK;
if (user_fault) {
mmu_unshadow(vcpu->kvm, gfn);
goto unshadowed;
}
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2008-06-09 16:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-06 14:01 Oops for sale Gerd Hoffmann
2008-06-06 20:48 ` Avi Kivity
[not found] ` <484D3310.6070908@redhat.com>
2008-06-09 16:33 ` Avi Kivity [this message]
2008-06-09 16:54 ` Gerd Hoffmann
2008-06-11 3:02 ` Avi Kivity
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