> -----Original Message-----
> From: Linuxppc-dev [mailto:linuxppc-dev-
> bounces+bharat.bhushan=freescale....@lists.ozlabs.org] On Behalf Of Michael
> Neuling
> Sent: Tuesday, February 12, 2013 8:59 AM
> To: Wood Scott-B07421
> Cc: linuxppc-dev@lists.ozlabs.org
> Subject: BOOKE KVM calling load_up_fpu from C?
>
> Scott,
>
> I was looking at changing how load_up_fpu works and I found this in
> arch/powerpc/kvm/booke.h:
>
> static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu) { #ifdef
> CONFIG_PPC_FPU
> if (vcpu->fpu_active && !(current->thread.regs->msr & MSR_FP)) {
> load_up_fpu();
> current->thread.regs->msr |= MSR_FP;
> }
> #endif
> }
>
> I'm wondering how this is suppose to work since load_up_fpu is suppose to have
> MSR in R12?
Is not the load_up_fpu() does mfmsr:
_GLOBAL(load_up_fpu)
mfmsr r5
ori r5,r5,MSR_FP
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
oris r5,r5,MSR_VSX@h
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
SYNC
MTMSRD(r5) /* enable use of fpu now */
isync
<snip>
-Bharat
>
> Mikey
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