linux-kernel - Re: [RFC PATCH v3 05/19] x86: KVMGT: use kvm_page_track_write_tracking

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Message-ID: <YoZyhIuvxNZBOdko@google.com>
Date:   Thu, 19 May 2022 16:38:28 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        intel-gfx@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        linux-kernel@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC PATCH v3 05/19] x86: KVMGT: use
 kvm_page_track_write_tracking_enable

On Wed, Apr 27, 2022, Maxim Levitsky wrote:
> @@ -1948,6 +1949,10 @@ static int kvmgt_guest_init(struct mdev_device *mdev)
>  	if (__kvmgt_vgpu_exist(vgpu, kvm))
>  		return -EEXIST;
>  
> +	ret = kvm_page_track_write_tracking_enable(kvm);
> +	if (ret)
> +		return ret;

If for some reason my idea to enable tracking during kvm_page_track_register_notifier()
doesn't pan out, it's probably worth adding a comment saying that enabling write
tracking can't be undone.

> +
>  	info = vzalloc(sizeof(struct kvmgt_guest_info));
>  	if (!info)
>  		return -ENOMEM;
> -- 
> 2.26.3
>