linux-kernel - Re: [PATCH V4 2/15] KVM/MMU: Add tlb flush with range helper function

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Message-ID: <20181014093541.GW30658@n2100.armlinux.org.uk>
Date:   Sun, 14 Oct 2018 10:35:41 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-mips@...ux-mips.org, linux@...linux.org, kvm@...r.kernel.org,
        rkrcmar@...hat.com, benh@...nel.crashing.org, will.deacon@....com,
        christoffer.dall@....com, paulus@...abs.org, hpa@...or.com,
        kys@...rosoft.com, kvmarm@...ts.cs.columbia.edu,
        lantianyu1986@...il.com, sthemmin@...rosoft.com,
        mpe@...erman.id.au, x86@...nel.org, michael.h.kelley@...rosoft.com,
        mingo@...hat.com, catalin.marinas@....com, jhogan@...nel.org,
        Lan Tianyu <Tianyu.Lan@...rosoft.com>, marc.zyngier@....com,
        haiyangz@...rosoft.com, kvm-ppc@...r.kernel.org,
        Liran Alon <liran.alon@...cle.com>, pbonzini@...hat.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ralf@...ux-mips.org, paul.burton@...s.com,
        devel@...uxdriverproject.org, vkuznets@...hat.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V4 2/15] KVM/MMU: Add tlb flush with range helper function

On Sun, Oct 14, 2018 at 10:27:34AM +0100, Russell King - ARM Linux wrote:
> On Sun, Oct 14, 2018 at 10:16:56AM +0200, Thomas Gleixner wrote:
> > On Sun, 14 Oct 2018, Liran Alon wrote:
> > > > On 13 Oct 2018, at 17:53, lantianyu1986@...il.com wrote:
> > > > 
> > > > From: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> > > > 
> > > > This patch is to add wrapper functions for tlb_remote_flush_with_range
> > > > callback.
> > > > 
> > > > Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> > > > ---
> > > > Change sicne V3:
> > > >       Remove code of updating "tlbs_dirty"
> > > > Change since V2:
> > > >       Fix comment in the kvm_flush_remote_tlbs_with_range()
> > > > ---
> > > > arch/x86/kvm/mmu.c | 40 ++++++++++++++++++++++++++++++++++++++++
> > > > 1 file changed, 40 insertions(+)
> > > > 
> > > > diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> > > > index c73d9f650de7..ff656d85903a 100644
> > > > --- a/arch/x86/kvm/mmu.c
> > > > +++ b/arch/x86/kvm/mmu.c
> > > > @@ -264,6 +264,46 @@ static void mmu_spte_set(u64 *sptep, u64 spte);
> > > > static union kvm_mmu_page_role
> > > > kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu);
> > > > 
> > > > +
> > > > +static inline bool kvm_available_flush_tlb_with_range(void)
> > > > +{
> > > > +	return kvm_x86_ops->tlb_remote_flush_with_range;
> > > > +}
> > > 
> > > Seems that kvm_available_flush_tlb_with_range() is not used in this patch…
> > 
> > What's wrong with that? 
> > 
> > It provides the implementation and later patches make use of it. It's a
> > sensible way to split patches into small, self contained entities.
> 
> From what I can see of the patches that follow _this_ patch in the
> series, this function remains unused.  So, not only is it not used
> in this patch, it's not used in this series.

Note - I seem to have only received patches 1 through 4, so this is
based on the patches I've received.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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