linux-kernel - RE: [PATCH 2/2] drm/i915/gvt: Unconditionally put reference to KVM when detaching vGPU

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Date:   Fri, 11 Nov 2022 02:50:02 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Christopherson,, Sean" <seanjc@...gle.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>
CC:     "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] drm/i915/gvt: Unconditionally put reference to KVM
 when detaching vGPU

> From: Sean Christopherson <seanjc@...gle.com>
> Sent: Friday, November 11, 2022 8:22 AM
> 
> Always put the KVM reference when closing a vCPU device, as
> intel_vgpu_open_device() succeeds if and only if the KVM pointer is
> valid and a reference to KVM is acquired.  And if that doesn't hold true,
> the call to kvm_page_track_unregister_notifier() a few lines earlier is
> doomed.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>