linux-kernel - Re: [PATCH v2 08/27] drm/i915/gvt: Use an "unsigned long" to iterate over memslot gfns

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Message-ID: <ZBQGeJiNosyes2DM@yzhao56-desk.sh.intel.com>
Date:   Fri, 17 Mar 2023 14:19:36 +0800
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>, <kvm@...r.kernel.org>,
        <intel-gvt-dev@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH v2 08/27] drm/i915/gvt: Use an "unsigned long" to iterate
 over memslot gfns

Reviewed-by: Yan Zhao <yan.y.zhao@...el.com>

On Fri, Mar 10, 2023 at 04:22:39PM -0800, Sean Christopherson wrote:
> Use an "unsigned long" instead of an "int" when iterating over the gfns
> in a memslot.  The number of pages in the memslot is tracked as an
> "unsigned long", e.g. KVMGT could theoretically break if a KVM memslot
> larger than 16TiB were deleted (2^32 * 4KiB).
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 90997cc385b4..68be66395598 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -1634,7 +1634,7 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
>  		struct kvm_memory_slot *slot,
>  		struct kvm_page_track_notifier_node *node)
>  {
> -	int i;
> +	unsigned long i;
>  	gfn_t gfn;
>  	struct intel_vgpu *info =
>  		container_of(node, struct intel_vgpu, track_node);
> -- 
> 2.40.0.rc1.284.g88254d51c5-goog
>