From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
Cc: "Alexey Kardashevskiy" <aik@ozlabs.ru>,
"Alexander Graf" <agraf@suse.de>,
qemu-ppc@nongnu.org, "Andreas Färber" <afaerber@suse.de>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v5] powerpc: add PVR mask support
Date: Thu, 29 Aug 2013 14:59:49 +1000 [thread overview]
Message-ID: <1377752389.4028.21.camel@pasglop> (raw)
In-Reply-To: <20130829045207.GA32466@iris.ozlabs.ibm.com>
On Thu, 2013-08-29 at 14:52 +1000, Paul Mackerras wrote:
> We are going to need a way to do that for pseries guests. So for
> example if we are running on a POWER8 machine and using KVM, we would
> want to be able to tell qemu that we want a POWER7 machine and have
> qemu put 0x0f000003 in the device tree, and also tell KVM to enable
> POWER7 compatibility mode when running the guest, presumably by
> setting the PVR for the guest to 0x0f000003. That PVR setting doesn't
> (and can't) modify the PVR seen by the guest, since the hardware
> doesn't provide any way to virtualize the PVR, but we will make it set
> the compatibility mode for the guest.
>
> How do you think we should handle this in qemu?
And how does that relate to what we will do during reconfiguration
reboots ?
Cheers,
Ben.
prev parent reply other threads:[~2013-08-29 5:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-28 10:37 [Qemu-devel] [PATCH v5] powerpc: add PVR mask support Alexey Kardashevskiy
2013-08-28 10:49 ` Andreas Färber
2013-08-28 11:01 ` Alexey Kardashevskiy
2013-09-04 10:15 ` Alexey Kardashevskiy
2013-08-29 3:33 ` Paul Mackerras
2013-08-29 4:52 ` Paul Mackerras
2013-08-29 4:59 ` Benjamin Herrenschmidt [this message]
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