linux-kernel - Re: [FYI PATCH] i915: kvmgt: the KVM mmu_lock is now an rwlock

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Date:   Tue, 9 Feb 2021 09:05:21 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [FYI PATCH] i915: kvmgt: the KVM mmu_lock is now an rwlock

On 2021.02.08 06:34:37 -0500, Paolo Bonzini wrote:
> Adjust the KVMGT page tracking callbacks.
> 
> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
> Cc: Zhi Wang <zhi.a.wang@...el.com>
> Cc: intel-gvt-dev@...ts.freedesktop.org
> Cc: intel-gfx@...ts.freedesktop.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Thanks for that!

Acked-by: Zhenyu Wang <zhenyuw@...ux.intel.com>

>  drivers/gpu/drm/i915/gvt/kvmgt.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 60f1a386dd06..b4348256ae95 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -1703,7 +1703,7 @@ static int kvmgt_page_track_add(unsigned long handle, u64 gfn)
>  		return -EINVAL;
>  	}
>  
> -	spin_lock(&kvm->mmu_lock);
> +	write_lock(&kvm->mmu_lock);
>  
>  	if (kvmgt_gfn_is_write_protected(info, gfn))
>  		goto out;
> @@ -1712,7 +1712,7 @@ static int kvmgt_page_track_add(unsigned long handle, u64 gfn)
>  	kvmgt_protect_table_add(info, gfn);
>  
>  out:
> -	spin_unlock(&kvm->mmu_lock);
> +	write_unlock(&kvm->mmu_lock);
>  	srcu_read_unlock(&kvm->srcu, idx);
>  	return 0;
>  }
> @@ -1737,7 +1737,7 @@ static int kvmgt_page_track_remove(unsigned long handle, u64 gfn)
>  		return -EINVAL;
>  	}
>  
> -	spin_lock(&kvm->mmu_lock);
> +	write_lock(&kvm->mmu_lock);
>  
>  	if (!kvmgt_gfn_is_write_protected(info, gfn))
>  		goto out;
> @@ -1746,7 +1746,7 @@ static int kvmgt_page_track_remove(unsigned long handle, u64 gfn)
>  	kvmgt_protect_table_del(info, gfn);
>  
>  out:
> -	spin_unlock(&kvm->mmu_lock);
> +	write_unlock(&kvm->mmu_lock);
>  	srcu_read_unlock(&kvm->srcu, idx);
>  	return 0;
>  }
> @@ -1772,7 +1772,7 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
>  	struct kvmgt_guest_info *info = container_of(node,
>  					struct kvmgt_guest_info, track_node);
>  
> -	spin_lock(&kvm->mmu_lock);
> +	write_lock(&kvm->mmu_lock);
>  	for (i = 0; i < slot->npages; i++) {
>  		gfn = slot->base_gfn + i;
>  		if (kvmgt_gfn_is_write_protected(info, gfn)) {
> @@ -1781,7 +1781,7 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
>  			kvmgt_protect_table_del(info, gfn);
>  		}
>  	}
> -	spin_unlock(&kvm->mmu_lock);
> +	write_unlock(&kvm->mmu_lock);
>  }
>  
>  static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
> -- 
> 2.26.2
> 
> _______________________________________________
> intel-gvt-dev mailing list
> intel-gvt-dev@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev

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