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Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check
From: |
Paul Mackerras |
Subject: |
Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check |
Date: |
Tue, 5 Nov 2013 15:00:10 +1100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Nov 04, 2013 at 10:05:58AM +0100, Alexander Graf wrote:
>
> Yeah, we really need to check that guest vpcu == host vcpu for HV KVM.
In general I agree, but the one difficulty I see is that a check for
exact equality will interact badly with qemu's habit of picking a
specific processor version when the user specifies something general
like "POWER7". So if the user does -cpu POWER7 on a machine with
(for example) a POWER7 v2.1 processor, but qemu arbitrarily picks the
PVR for POWER7 v2.3, then it will fail, which will be completely
puzzling to the user -- "I asked for POWER7, and it is a POWER7,
what's the problem??".
Maybe if the user asks for a non-specific processor type, and the
host's PVR matches the request, then qemu should take the host's PVR
rather than just picking some arbitrary processor version.
Paul.
- [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexey Kardashevskiy, 2013/11/03
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexander Graf, 2013/11/04
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexey Kardashevskiy, 2013/11/04
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check,
Paul Mackerras <=
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexander Graf, 2013/11/05
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Andreas Färber, 2013/11/05
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexander Graf, 2013/11/05
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Paul Mackerras, 2013/11/05
- Re: [Qemu-devel] [PATCH] RFC: powerpc: add PVR compatibility check, Alexander Graf, 2013/11/06