linux-kernel - Re: [PATCH v2 1/2] KVM: nVMX: enhance allocate/free

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Message-ID: <BLU436-SMTP223B03D71DB3B9D9097F476805B0@phx.gbl>
Date:	Wed, 16 Sep 2015 11:58:07 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Jan Kiszka <jan.kiszka@...mens.com>, Bandan Das <bsd@...hat.com>,
	Wincy Van <fanwenyi0529@...il.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] KVM: nVMX: enhance allocate/free_vpid to handle
 shadow vpid

On 9/15/15 8:54 PM, Paolo Bonzini wrote:
>
> On 15/09/2015 12:30, Wanpeng Li wrote:
>> +	if (!nested) {
>> +		vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
>> +		if (vpid < VMX_NR_VPIDS) {
>>   		vmx->vpid = vpid;
>>   		__set_bit(vpid, vmx_vpid_bitmap);
>> +		}
>> +	} else {
>> +		vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
>> +		if (vpid < VMX_NR_VPIDS) {
>> +			vmx->nested.vpid02 = vpid;
>> +			__set_bit(vpid, vmx_vpid_bitmap);
>> +		}
> Messy indentation, and a lot of duplicate code.  Can you instead have
> (which I think was Jan's suggestion too):
>
> static int allocate_vpid(void);
> static void free_vpid(int vpid);

I see, done in v3.

>
> That said, I like the simple solution to the "too many VPIDs for each L1
> VCPU" processor.

Thanks. :-)

Regards,
Wanpeng Li

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