From: Stefan Hajnoczi <stefanha@gmail.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-devel qemu-devel <qemu-devel@nongnu.org>,
KVM devel mailing list <kvm@vger.kernel.org>,
Juan Quintela <quintela@redhat.com>
Subject: Re: [Qemu-devel] KVM call minutes for 2013-10-01
Date: Wed, 2 Oct 2013 10:11:02 +0200 [thread overview]
Message-ID: <20131002081101.GD1550@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <CAFEAcA9Nt1Q5Zc9LSztBytDiJpA17Nfe7mEyicD_bFtngVSLgw@mail.gmail.com>
On Wed, Oct 02, 2013 at 12:17:35AM +0900, Peter Maydell wrote:
> On 1 October 2013 23:54, Juan Quintela <quintela@redhat.com> wrote:
> > - Multicore on Multicore:
> > TCG has no locking, no people really working there (Alex Graf?)
>
> Apart from the TCG locking issues (which are conceptually
> tractable if anybody cares to try to fix them), the real complication
> of multicore-on-multicore is how you handle discrepancies between
> the memory models of host and guest, and in particular what
> you do if your guest has a stronger memory model than your host:
> do you insert barrier insns after every guest load/store? fall back
> to not doing mp-on-mp? something else?
If you want applications to always work then you need to insert
barriers. It's expensive.
Stefan
prev parent reply other threads:[~2013-10-02 8:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-01 14:54 [Qemu-devel] KVM call minutes for 2013-10-01 Juan Quintela
2013-10-01 15:17 ` Peter Maydell
2013-10-02 8:11 ` Stefan Hajnoczi [this message]
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