linux-kernel - Re: [PATCH v4 09/29] drm/i915/gvt: Use an "unsigned long" to iterate over memslot gfns

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Date:   Tue, 1 Aug 2023 14:28:55 +0300
From:   "Wang, Zhi A" <zhi.a.wang@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
CC:     <kvm@...r.kernel.org>, <intel-gvt-dev@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Yan Zhao <yan.y.zhao@...el.com>,
        Yongwei Ma <yongwei.ma@...el.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH v4 09/29] drm/i915/gvt: Use an "unsigned long" to iterate
 over memslot gfns

On 7/29/2023 4:35 AM, 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).
>
> Reviewed-by: Yan Zhao <yan.y.zhao@...el.com>
> Tested-by: Yongwei Ma <yongwei.ma@...el.com>
> 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 97c6d3c53710..6f52886c4051 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -1620,7 +1620,7 @@ 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);

Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>