On Tue, May 21, 2013 at 09:21:06AM -0700, David Daney wrote:
> On 05/21/2013 08:37 AM, Gleb Natapov wrote:
> >On Mon, May 20, 2013 at 02:01:26PM -0700, David Daney wrote:
> >>From: David Daney <david.daney@xxxxxxxxxx>
> >>
> >>Because not all 256 CP0 registers are ever implemented, we need a
> >>different method of manipulating them. Use the
> >>KVM_GET_MSRS/KVM_SET_MSRS mechanism as x86 does for its MSRs.
> >>
> >Have you looked at KVM_(GET|SET)_ONE_REG interface (not used by x86, but is
> >used bu arm/ppc/s390). It looks like it is more suitable for your case.
> >Actually you can use it instead of KVM_(GET|SET)_REGS for all registers.
>
> Yes, I suppose it could be used. One problem it has is that there
> is no way to query the set of supported registers.
KVM_GET_REG_LIST
> Also you have to
> make multiple calls to set multiple registers, which involves
> vcpu_{load,put} for each register.
>
How often this happens on the fast path on mips? On x86 this never
happens on the fast path so it uses KVM_(GET|SET)_REGS mostly for
historical reasons.
> We will definitely implement it for all the FP and General Purpose
> registers.
>
> >
> >>Code related to implementing KVM_GET_MSRS/KVM_SET_MSRS is consolidated
>
--
Gleb.
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