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Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests
From: |
Jamie Lokier |
Subject: |
Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests |
Date: |
Sun, 9 Sep 2007 14:07:25 +0100 |
User-agent: |
Mutt/1.4.1i |
Avi Kivity wrote:
> Let's start with '-cpu host' as 'cpu host-cpuid' and implement '-cpu
> host-os' on the first bug report? I have a feeling we won't ever see it.
I have a feeling you won't ever see it either, but not because it's a
missing feature.
Instead, I think a very small number of users will spend hours
frustrated that some obscure guest doesn't work properly on their
obscure x86 hardware, then they will learn that they should not use
"-cpuid host" for that guest on that hardware, even though it works
fine with other guests, and then their problem will be solved (albeit
at a cost), and seen as such an obscure combination that it might
never be reported to Qemu developers.
In other words, host-os is what _I'd_ implement because I care too
much about the poor obscure users and think it's the safe option, but
I'm not doing the implementing here ;-)
If you are curious what the differences are, do this in a current
Linux source tree:
egrep -R '(set|clear)_bit\(X86_FEATURE' arch/{i386,x86_64}/kernel
-- Jamie
- [Qemu-devel] expose host CPU features to guests, danken, 2007/09/05
- Re: [Qemu-devel] Re: [kvm-devel] expose host CPU features to guests, Jamie Lokier, 2007/09/07
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Avi Kivity, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Jamie Lokier, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Avi Kivity, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests,
Jamie Lokier <=
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Avi Kivity, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Paul Brook, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Avi Kivity, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Jamie Lokier, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Paul Brook, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Avi Kivity, 2007/09/09
- Re: [kvm-devel] [Qemu-devel] Re: expose host CPU features to guests, Jamie Lokier, 2007/09/10
[Qemu-devel] expose host CPU features to guests: Take 2, Dan Kenigsberg, 2007/09/10