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 03:41:58 -0500 (EST)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Bandan Das <bsd@...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



----- 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.

Paolo