On Thu, Jun 26, 2014 at 10:44:23AM +0100, James Hogan wrote:
> Change the default Malta CPU model for when KVM is enabled to 24Kc which
> doesn't have floating point support compared to the 24Kf.
>
> The resulting incorrect Config CP0 register value doesn't get passed to
> KVM yet as KVM doesn't expose it, however we should ensure it is set
> correctly now to reduce the risk of breaking migration/loadvm to a
> future version of QEMU/Linux that does support them.
>
> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
> Cc: Aurelien Jarno <aurelien@xxxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
> hw/mips/mips_malta.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
> index 2868ee5b0307..c0841991f4e9 100644
> --- a/hw/mips/mips_malta.c
> +++ b/hw/mips/mips_malta.c
> @@ -949,7 +949,12 @@ void mips_malta_init(MachineState *machine)
> #ifdef TARGET_MIPS64
> cpu_model = "20Kc";
> #else
> - cpu_model = "24Kf";
> + if (kvm_enabled()) {
> + /* Don't enable FPU on KVM yet */
> + cpu_model = "24Kc";
> + } else {
> + cpu_model = "24Kf";
> + }
> #endif
> }
Given the explanations in the other mails, that looks fine to me, that
said I think we should at least warn the user that we are disabling some
features, instead of doing it silently. This is what is done for example
on x86 when a CPU feature is not available.
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurelien@xxxxxxxxxxx http://www.aurel32.net
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