linux-kernel - Re: [PATCH V2 00/10] X86/KVM/Hyper-V: Add HV ept tlb range list flush support in KVM

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Date:   Thu, 14 Feb 2019 17:40:20 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     lantianyu1986@...il.com
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, benh@...nel.crashing.org,
        bp@...en8.de, catalin.marinas@....com, christoffer.dall@....com,
        devel@...uxdriverproject.org, haiyangz@...rosoft.com,
        hpa@...or.com, jhogan@...nel.org, kvmarm@...ts.cs.columbia.edu,
        kvm-ppc@...r.kernel.org, kvm@...r.kernel.org, kys@...rosoft.com,
        linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, marc.zyngier@....com,
        mingo@...hat.com, mpe@...erman.id.au, paul.burton@...s.com,
        paulus@...abs.org, ralf@...ux-mips.org, rkrcmar@...hat.com,
        sashal@...nel.org, sthemmin@...rosoft.com, tglx@...utronix.de,
        will.deacon@....com, x86@...nel.org,
        michael.h.kelley@...rosoft.com, vkuznets@...hat.com
Subject: Re: [PATCH V2 00/10] X86/KVM/Hyper-V: Add HV ept tlb range list flush
 support in KVM

On 02/02/19 02:38, lantianyu1986@...il.com wrote:
> From: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> 
> This patchset is to introduce hv ept tlb range list flush function
> support in the KVM MMU component. Flushing ept tlbs of several address
> range can be done via single hypercall and new list flush function is
> used in the kvm_mmu_commit_zap_page() and FNAME(sync_page). This patchset
> also adds more hv ept tlb range flush support in more KVM MMU function.
> 
> Change since v1:
>        1) Make flush list as a hlist instead of list in order to 
>        keep struct kvm_mmu_page size.
>        2) Add last_level flag in the struct kvm_mmu_page instead
>        of spte pointer
>        3) Move tlb flush from kvm_mmu_notifier_clear_flush_young() to kvm_age_hva()
>        4) Use range flush in the kvm_vm_ioctl_get/clear_dirty_log()

Looks good except for the confusion on sp->last_level (which was mostly
mine---sorry about that).  I think it can still make 5.1.

However, note that I've never received "KVM/MMU: Use tlb range flush  in
the kvm_age_hva()".

Paolo