linux-kernel - Re: [PATCH v7 06/11] iommu/vt-d: Avoid duplicated code for PASID setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <552c55f3-a8d6-10aa-5dbc-5b2c45ad90d0@redhat.com>
Date:   Tue, 12 Nov 2019 10:54:52 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v7 06/11] iommu/vt-d: Avoid duplicated code for PASID
 setup

Hi Jacob,

On 10/24/19 9:54 PM, Jacob Pan wrote:
> After each setup for PASID entry, related translation caches must be flushed.
> We can combine duplicated code into one function which is less error prone.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  drivers/iommu/intel-pasid.c | 48 +++++++++++++++++----------------------------
>  1 file changed, 18 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
> index e79d680fe300..ffbd416ed3b8 100644
> --- a/drivers/iommu/intel-pasid.c
> +++ b/drivers/iommu/intel-pasid.c
> @@ -485,6 +485,21 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
>  		devtlb_invalidation_with_pasid(iommu, dev, pasid);
>  }
>  
> +static void pasid_flush_caches(struct intel_iommu *iommu,
> +				struct pasid_entry *pte,
> +				int pasid, u16 did)
> +{
> +	if (!ecap_coherent(iommu->ecap))
> +		clflush_cache_range(pte, sizeof(*pte));
> +
> +	if (cap_caching_mode(iommu->cap)) {
> +		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> +		iotlb_invalidation_with_pasid(iommu, did, pasid);
> +	} else {
> +		iommu_flush_write_buffer(iommu);
> +	}
> +}
> +
>  /*
>   * Set up the scalable mode pasid table entry for first only
>   * translation type.
> @@ -530,16 +545,7 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
>  	/* Setup Present and PASID Granular Transfer Type: */
>  	pasid_set_translation_type(pte, 1);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
> @@ -603,16 +609,7 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
>  	 */
>  	pasid_set_sre(pte);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
> @@ -646,16 +643,7 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
>  	 */
>  	pasid_set_sre(pte);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
> 
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric