Hi Eric,
On 2020/11/18 19:21, Eric Auger wrote:
> On attach_pasid_table() we program STE S1 related info set
> by the guest into the actual physical STEs. At minimum
> we need to program the context descriptor GPA and compute
> whether the stage1 is translated/bypassed or aborted.
>
> Signed-off-by: Eric Auger <eric.au...@redhat.com>
>
> ---
> v7 -> v8:
> - remove smmu->features check, now done on domain finalize
>
> v6 -> v7:
> - check versions and comment the fact we don't need to take
> into account s1dss and s1fmt
> v3 -> v4:
> - adapt to changes in iommu_pasid_table_config
> - different programming convention at s1_cfg/s2_cfg/ste.abort
>
> v2 -> v3:
> - callback now is named set_pasid_table and struct fields
> are laid out differently.
>
> v1 -> v2:
> - invalidate the STE before changing them
> - hold init_mutex
> - handle new fields
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 89 +++++++++++++++++++++
> 1 file changed, 89 insertions(+)
>
> 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 412ea1bafa50..805acdc18a3a 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2661,6 +2661,93 @@ static void arm_smmu_get_resv_regions(struct device
> *dev,
> iommu_dma_get_resv_regions(dev, head);
> }
>
> +static int arm_smmu_attach_pasid_table(struct iommu_domain *domain,
> + struct iommu_pasid_table_config *cfg)
> +{
> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
> + struct arm_smmu_master *master;
> + struct arm_smmu_device *smmu;
> + unsigned long flags;
> + int ret = -EINVAL;
> +
> + if (cfg->format != IOMMU_PASID_FORMAT_SMMUV3)
> + return -EINVAL;
> +
> + if (cfg->version != PASID_TABLE_CFG_VERSION_1 ||
> + cfg->vendor_data.smmuv3.version != PASID_TABLE_SMMUV3_CFG_VERSION_1)
> + return -EINVAL;
> +
> + mutex_lock(&smmu_domain->init_mutex);
> +
> + smmu = smmu_domain->smmu;
> +
> + if (!smmu)
> + goto out;
> +
> + if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
> + goto out;
> +
> + switch (cfg->config) {
> + case IOMMU_PASID_CONFIG_ABORT:
> + smmu_domain->s1_cfg.set = false;
> + smmu_domain->abort = true;
> + break;
> + case IOMMU_PASID_CONFIG_BYPASS:
> + smmu_domain->s1_cfg.set = false;
> + smmu_domain->abort = false;
I didn't test it, but it seems that this will cause BUG() in
arm_smmu_write_strtab_ent().
At the line "BUG_ON(ste_live && !nested);". Maybe I miss something?
> + break;
> + case IOMMU_PASID_CONFIG_TRANSLATE:
> + /* we do not support S1 <-> S1 transitions */
> + if (smmu_domain->s1_cfg.set)
> + goto out;
> +
> + /*
> + * we currently support a single CD so s1fmt and s1dss
> + * fields are also ignored
> + */
> + if (cfg->pasid_bits)
> + goto out;
> +
> + smmu_domain->s1_cfg.cdcfg.cdtab_dma = cfg->base_ptr;
> + smmu_domain->s1_cfg.set = true;
> + smmu_domain->abort = false;
> + break;
> + default:
> + goto out;
> + }
> + spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> + list_for_each_entry(master, &smmu_domain->devices, domain_head)
> + arm_smmu_install_ste_for_dev(master);
> + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
> + ret = 0;
> +out:
> + mutex_unlock(&smmu_domain->init_mutex);
> + return ret;
> +}
> +
[...]
Thanks,
Keqian
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