Re: [Qemu-devel] [PATCH v2 2/3] KVM: Use -cpu best as default on x86

[Avi Kivity]

On 06/26/2012 07:39 PM, Alexander Graf wrote:
> When running QEMU without -cpu parameter, the user usually wants a sane
> default. So far, we're using the qemu64/qemu32 CPU type, which basically
> means "the maximum TCG can emulate".
> 
> That's a really good default when using TCG, but when running with KVM
> we much rather want a default saying "the maximum performance I can get".
> 
> Fortunately we just added an option that gives us the best performance
> while still staying safe on the testability side of things: -cpu best.
> So all we need to do is make -cpu best the default when the user doesn't
> explicitly specify a CPU type.
> 
> This fixes a lot of subtile breakage in the GNU toolchain (libgmp) which

subtle

> hicks up on QEMU's non-existent CPU models.
> 
> This patch also adds a new pc-1.2 machine type to stay backwards compatible
> with older versions of QEMU.

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