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Re: [Qemu-devel] KVM call minutes for 2013-10-01
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] KVM call minutes for 2013-10-01 |
Date: |
Wed, 2 Oct 2013 10:11:02 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Oct 02, 2013 at 12:17:35AM +0900, Peter Maydell wrote:
> On 1 October 2013 23:54, Juan Quintela <address@hidden> 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