On Fri, 25 Jun 2021, Rahul Singh wrote:
> Backport commit e19898077cfb642fe151ba22981e795c74d9e114
> "iommu/arm-smmu: Set privileged attribute to 'default' instead of
> 'unprivileged'"
>
> Original commit message:
> Currently the driver sets all the device transactions privileges
> to UNPRIVILEGED, but there are cases where the iommu masters wants
> to isolate privileged supervisor and unprivileged user.
> So don't override the privileged setting to unprivileged, instead
> set it to default as incoming and let it be controlled by the
> pagetable settings.
>
> Acked-by: Will Deacon <will.deacon@arm.com>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
>
> Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> xen/drivers/passthrough/arm/smmu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
> index 1a68c2ab3b..d9a3a0cbf6 100644
> --- a/xen/drivers/passthrough/arm/smmu.c
> +++ b/xen/drivers/passthrough/arm/smmu.c
> @@ -1566,7 +1566,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
> continue;
>
> s2cr[idx].type = type ;
> - s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
> + s2cr[idx].privcfg = S2CR_PRIVCFG_DEFAULT;
> s2cr[idx].cbndx = cbndx;
> arm_smmu_write_s2cr(smmu, idx);
> }
> --
> 2.17.1
>