From: Paolo Bonzini <pbonzini@redhat.com>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: "Nikunj A Dadhania" <nikunj@linux.vnet.ibm.com>,
"Alexander Graf" <agraf@suse.de>,
qemu-devel@nongnu.org, qemu-ppc@nongnu.org,
"Paul Mackerras" <paulus@samba.org>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [PATCH] spapr: add "compat" machine option
Date: Tue, 05 Nov 2013 10:06:04 +0100 [thread overview]
Message-ID: <5278B4FC.6020503@redhat.com> (raw)
In-Reply-To: <5249754E.6070308@ozlabs.ru>
Il 30/09/2013 14:57, Alexey Kardashevskiy ha scritto:
>> > Why is the option under -machine instead of -cpu?
> Because it is still the same CPU and the guest will still read the real
> PVR from the hardware (which it may not support but this is why we need
> compatibility mode).
How do you support migration from a newer to an older CPU then? I think
the guest should never see anything about the hardware CPU model.
Paolo
> It is possible to run QEMU with -cpu POWER8 with some old distro which
> does not know about power8, it will switch to power6-compat mode, the
> the user does "yum update" (or analog) and then the new kernel (with
> power8 support) will do H_CAS again and this time "raw" power8 should be
> selected.
next prev parent reply other threads:[~2013-11-05 9:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-27 8:06 [Qemu-devel] [PATCH] spapr: add "compat" machine option Alexey Kardashevskiy
2013-09-30 11:25 ` Alexander Graf
2013-09-30 11:52 ` Paolo Bonzini
2013-09-30 12:57 ` Alexey Kardashevskiy
2013-11-05 9:06 ` Paolo Bonzini [this message]
2013-11-05 9:16 ` Alexander Graf
2013-11-05 9:52 ` Paolo Bonzini
2013-11-05 10:27 ` Alexander Graf
2013-11-05 10:33 ` Paolo Bonzini
2013-11-05 10:45 ` Alexey Kardashevskiy
2013-11-05 10:46 ` Paolo Bonzini
2013-11-05 13:53 ` Andreas Färber
2013-11-06 11:36 ` Igor Mammedov
2013-11-07 9:11 ` Alexey Kardashevskiy
2013-11-07 13:36 ` Igor Mammedov
2013-11-08 8:22 ` Alexey Kardashevskiy
2013-11-08 13:20 ` Andreas Färber
2013-11-08 14:57 ` Alexey Kardashevskiy
2013-11-08 15:07 ` Andreas Färber
2013-11-07 14:01 ` Andreas Färber
2013-11-08 8:22 ` [Qemu-devel] [PATCH v2 0/2] " Alexey Kardashevskiy
2013-11-08 8:22 ` [Qemu-devel] [PATCH v2 1/2] cpu: add suboptions support Alexey Kardashevskiy
2013-11-08 8:22 ` [Qemu-devel] [PATCH v2 2/2] target-ppc: add "compat" CPU option Alexey Kardashevskiy
2013-11-08 13:24 ` [Qemu-devel] [PATCH v2 0/2] spapr: add "compat" machine option Andreas Färber
2013-11-06 3:27 ` [Qemu-devel] [PATCH] " Paul Mackerras
2013-09-30 13:22 ` Alexey Kardashevskiy
2013-09-30 14:49 ` Alexander Graf
2013-11-05 2:19 ` Alexey Kardashevskiy
2013-11-05 9:23 ` Alexander Graf
2013-11-06 5:48 ` Paul Mackerras
2013-11-06 12:07 ` Alexander Graf
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