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Re: [Qemu-devel] cpuid problem in upstream qemu with kvm
From: |
john cooper |
Subject: |
Re: [Qemu-devel] cpuid problem in upstream qemu with kvm |
Date: |
Mon, 21 Dec 2009 17:51:13 -0500 |
User-agent: |
Thunderbird 2.0.0.9 (X11/20071115) |
Dor Laor wrote:
Qemu will check the required cpuid of the cpu model on the host and
refuse to load otherwise. When moving to this model, migration can be
simplified too since there are fewer combination, and one can choose
performance over migration flexibility and wise versa.
Due to the above check, the destination qemu won't load if the host does
not support its cpu model.
If you're referring to the check in my patch, that's
currently advisory only.
The existing cpu model encoding of CPUID tosses flags
in to the soup on speculation they may be available
on the host. If not it assumes they will be quietly
disabled on their way to the guest along with whatever
flags were enabled via +<flag> on the command line.
This mixed treatment for model implied vs. user
specified flags could be partly an artifact of trying
to adapt the legacy qemu64 model to whatever host
silicon it finds itself upon.
-john
--
address@hidden
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, (continued)
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Anthony Liguori, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Alexander Graf, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/21
- [Qemu-devel] Re: cpuid problem in upstream qemu with kvm, Paolo Bonzini, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/20
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Gleb Natapov, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Dor Laor, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm,
john cooper <=
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Dor Laor, 2009/12/22
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, john cooper, 2009/12/22
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Anthony Liguori, 2009/12/22
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Avi Kivity, 2009/12/23
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Avi Kivity, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Andre Przywara, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Avi Kivity, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Jamie Lokier, 2009/12/22
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Avi Kivity, 2009/12/21
- Re: [Qemu-devel] cpuid problem in upstream qemu with kvm, Michael S. Tsirkin, 2009/12/21