linux-kernel - Re: [PATCH v2 4/8] iommu/arm-smmu-v3: move stall

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]

Date:   Mon, 31 Jul 2023 21:28:36 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
CC:     <iommu@...ts.linux.dev>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <will@...nel.org>,
        <robin.murphy@....com>, <jgg@...dia.com>,
        <jean-philippe@...aro.org>
Subject: Re: [PATCH v2 4/8] iommu/arm-smmu-v3: move stall_enabled to the cd
 table

On Mon, Jul 31, 2023 at 06:48:14PM +0800, Michael Shavit wrote:
> This controls whether CD entries will have the stall bit set when
> writing entries into the table.
> 
> Signed-off-by: Michael Shavit <mshavit@...gle.com>
> ---
> 
> Changes in v2:
> - Use a bitfield instead of a bool for stall_enabled
> 
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++----
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 3 ++-
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 8a286e3838d70..654acf6002bf3 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -1114,7 +1114,7 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
>                         FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) |
>                         CTXDESC_CD_0_V;
> 
> -               if (smmu_domain->stall_enabled)
> +               if (smmu_domain->cd_table.stall_enabled)
>                         val |= CTXDESC_CD_0_S;

This cd_table->stall_enabled comes from master->stall_enabled, and
cd_table will be in master structure. Also, struct arm_smmu_master
pointer will be passed in to arm_smmu_write_ctx_desc(). So, there
seems to be no need of master->cd_table.stall_enabled in the end;
just use master->stall_enabled directly?

Thanks
Nicolin