linux-kernel - Re: [PATCH] KVM: VMX: use vmcs_set/clear_bits for CPU-based execution controls

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Date:   Fri, 17 Feb 2017 12:22:14 -0500
From:   Bandan Das <bsd@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: use vmcs_set/clear_bits for CPU-based execution controls

Paolo Bonzini <pbonzini@...hat.com> writes:

> ----- Original Message -----
>> From: "Bandan Das" <bsd@...hat.com>
>> To: "Paolo Bonzini" <pbonzini@...hat.com>
>> Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
>> Sent: Friday, February 17, 2017 1:04:14 AM
>> Subject: Re: [PATCH] KVM: VMX: use vmcs_set/clear_bits for CPU-based execution controls
>> 
>> Paolo Bonzini <pbonzini@...hat.com> writes:
>> 
>> > Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
>> > ---
>> 
>> I took a quick look and found these two potential
>> consumers of these set/clear wrappers.
>> 
>> vmcs_set_secondary_exec_control()
>> vmx_set_virtual_x2apic_mode()
>> 
>> Since this has been reviewed already,
>> we can just have them later in a follow up
>> (unless you left them out intentionally).
>
> Both of these can both set and clear bits, so they could be the
> consumer of a new function
>
> void vmcs_write_bits(u16 field, u32 value, u32 mask)
>
> but I don't see much benefit in introducing it; the cognitive
> load is higher than vmcs_{set,clear}_bits.

Yes, agreed. Thanks!

> Paolo