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

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Message-ID: <alpine.DEB.2.21.1810141014350.1438@nanos.tec.linutronix.de>
Date:   Sun, 14 Oct 2018 10:16:56 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Liran Alon <liran.alon@...cle.com>
cc:     lantianyu1986@...il.com, Lan Tianyu <Tianyu.Lan@...rosoft.com>,
        christoffer.dall@....com, marc.zyngier@....com, linux@...linux.org,
        catalin.marinas@....com, will.deacon@....com, jhogan@...nel.org,
        ralf@...ux-mips.org, paul.burton@...s.com, paulus@...abs.org,
        benh@...nel.crashing.org, mpe@...erman.id.au, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, pbonzini@...hat.com,
        rkrcmar@...hat.com, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        linux-mips@...ux-mips.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devel@...uxdriverproject.org,
        kvm@...r.kernel.org, michael.h.kelley@...rosoft.com,
        vkuznets@...hat.com
Subject: Re: [PATCH V4 2/15] KVM/MMU: Add tlb flush with range helper
 function

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.

Thanks,

	tglx