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Message-ID: <1517594754.31953.65.camel@infradead.org>
Subject: Re: [PATCH v6 4/5] KVM: VMX: Allow direct access to
 MSR_IA32_SPEC_CTRL
From:   David Woodhouse <dwmw2@infradead.org>
To:     Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        KarimAllah Ahmed <karahmed@amazon.de>
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org,
        Asit Mallick <asit.k.mallick@intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Dan Williams <dan.j.williams@intel.com>,
        Jun Nakajima <jun.nakajima@intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Ashok Raj <ashok.raj@intel.com>
In-Reply-To: <20180202175352.GT28192@char.us.oracle.com>
References: <1517522386-18410-1-git-send-email-karahmed@amazon.de>
         <1517522386-18410-5-git-send-email-karahmed@amazon.de>
         <20180202175352.GT28192@char.us.oracle.com>
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Date:   Fri, 02 Feb 2018 18:05:54 +0000
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On Fri, 2018-02-02 at 12:53 -0500, Konrad Rzeszutek Wilk wrote:
> .snip..
> >=20
> > @@ -1913,6 +1914,29 @@ static void update_exception_bitmap(struct
> > kvm_vcpu *vcpu)
> > =C2=A0}
> > =C2=A0
> > =C2=A0/*
> > + * Check if MSR is intercepted for currently loaded MSR bitmap.
> > + */
> > +static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr)
> > +{
> > +	unsigned long *msr_bitmap;
> > +	int f =3D sizeof(unsigned long);
>
> unsigned int

$ grep -n 'f =3D sizeof' vmx.c
1934:	int f =3D sizeof(unsigned long);
5013:	int f =3D sizeof(unsigned long);
5048:	int f =3D sizeof(unsigned long);
5097:	int f =3D sizeof(unsigned long);

It sucks enough that we're doing this stuff repeatedly, and it's a
prime candidate for cleaning up, but I wasn't going to send Karim off
to bikeshed that today. Let's at least keep it consistent.

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