Re: [PATCH 2/2] KVM: PPC: booke: Add watchdog emulation

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On 07/09/2012 12:13 AM, Bhushan Bharat-R65777 wrote:
> 
> 
>> -----Original Message-----
>> From: Alexander Graf [mailto:agraf@xxxxxxx]
>> Sent: Saturday, July 07, 2012 1:21 PM
>> To: Wood Scott-B07421
>> Cc: Bhushan Bharat-R65777; kvm-ppc@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; Bhushan
>> Bharat-R65777
>> Subject: Re: [PATCH 2/2] KVM: PPC: booke: Add watchdog emulation
>>
>>
>> Ah, being 2 bits wide, the above code suddenly makes more sense :). How about
>>
>> /* WRC is a 2-bit field that is supposed to preserve its value once written to
>> be non-zero */
>> spr_val &= ~TCR_WRC_MASK;
>> spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
>> kvmppc_set_tcr(vcpu, spr_val);
> 
> I think you mean:
> 
> if (TCR_WRC_MASK & vcpu->arch.tcr) {
>     spr_val &= ~TCR_WRC_MASK;
>     spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
> }
> kvmppc_set_tcr(vcpu, spr_val);

Actually I think he means:

if (vcpu->arch.tcr & TCR_WRC_MASK) {
	spr_val &= ~TCR_WRC_MASK;
	spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
}

kvmppc_set_tcr(vcpu, spr_val);

:-)

-Scott

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