From: Robin Murphy <robin.murphy@arm.com>
To: Eric Auger <eric.auger@redhat.com>,
eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, joro@8bytes.org,
alex.williamson@redhat.com, jacob.jun.pan@linux.intel.com,
yi.l.liu@intel.com, jean-philippe.brucker@arm.com,
will.deacon@arm.com
Cc: kevin.tian@intel.com, vincent.stehle@arm.com,
ashok.raj@intel.com, marc.zyngier@arm.com
Subject: Re: [PATCH v7 13/23] iommu/smmuv3: Implement attach/detach_pasid_table
Date: Wed, 8 May 2019 15:38:13 +0100 [thread overview]
Message-ID: <acde8b95-9cbc-c5e6-eb28-37bff7431e40@arm.com> (raw)
In-Reply-To: <20190408121911.24103-14-eric.auger@redhat.com>
On 08/04/2019 13:19, 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.auger@redhat.com>
>
> ---
> 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-smmu-v3.c | 121 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 121 insertions(+)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index e22e944ffc05..1486baf53425 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2207,6 +2207,125 @@ static void arm_smmu_put_resv_regions(struct device *dev,
> kfree(entry);
> }
>
> +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_data *entry;
> + struct arm_smmu_s1_cfg *s1_cfg;
> + 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->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->features & ARM_SMMU_FEAT_TRANS_S1) &&
> + (smmu->features & ARM_SMMU_FEAT_TRANS_S2))) {
> + dev_info(smmu_domain->smmu->dev,
> + "does not implement two stages\n");
> + goto out;
> + }
That check is redundant (and frankly looks a little bit spammy). If the
one below is not enough, there is a problem elsewhere - if it's possible
for smmu_domain->stage to ever get set to ARM_SMMU_DOMAIN_NESTED without
both stages of translation present, we've already gone fundamentally wrong.
> +
> + if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
> + goto out;
> +
> + switch (cfg->config) {
> + case IOMMU_PASID_CONFIG_ABORT:
> + spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> + list_for_each_entry(entry, &smmu_domain->devices, list) {
> + entry->ste.s1_cfg = NULL;
> + entry->ste.abort = true;
> + arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
> + }
> + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
> + ret = 0;
> + break;
> + case IOMMU_PASID_CONFIG_BYPASS:
> + spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> + list_for_each_entry(entry, &smmu_domain->devices, list) {
> + entry->ste.s1_cfg = NULL;
> + entry->ste.abort = false;
> + arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
> + }
> + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
> + ret = 0;
> + break;
> + case IOMMU_PASID_CONFIG_TRANSLATE:
> + /*
> + * we currently support a single CD so s1fmt and s1dss
> + * fields are also ignored
> + */
> + if (cfg->pasid_bits)
> + goto out;
> +
> + s1_cfg = &smmu_domain->s1_cfg;
> + s1_cfg->cdptr_dma = cfg->base_ptr;
> +
> + spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> + list_for_each_entry(entry, &smmu_domain->devices, list) {
> + entry->ste.s1_cfg = s1_cfg;
Either we reject valid->valid transitions outright, or we need to remove
and invalidate the existing S1 context from the STE at this point, no?
> + entry->ste.abort = false;
> + arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
> + }
> + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
> + ret = 0;
> + break;
> + default:
> + break;
> + }
> +out:
> + mutex_unlock(&smmu_domain->init_mutex);
> + return ret;
> +}
> +
> +static void arm_smmu_detach_pasid_table(struct iommu_domain *domain)
> +{
> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
> + struct arm_smmu_master_data *entry;
> + struct arm_smmu_device *smmu;
> + unsigned long flags;
> +
> + mutex_lock(&smmu_domain->init_mutex);
> +
> + smmu = smmu_domain->smmu;
> +
> + if (!smmu)
> + return;
> +
> + if (!((smmu->features & ARM_SMMU_FEAT_TRANS_S1) &&
> + (smmu->features & ARM_SMMU_FEAT_TRANS_S2))) {
> + dev_info(smmu_domain->smmu->dev,
> + "does not implement two stages\n");
> + return;
> + }
Same comment as before.
Robin.
> +
> + if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
> + return;
> +
> + spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> + list_for_each_entry(entry, &smmu_domain->devices, list) {
> + entry->ste.s1_cfg = NULL;
> + entry->ste.abort = true;
> + arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
> + }
> + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
> +
> + memset(&smmu_domain->s1_cfg, 0, sizeof(struct arm_smmu_s1_cfg));
> + mutex_unlock(&smmu_domain->init_mutex);
> +}
> +
> static struct iommu_ops arm_smmu_ops = {
> .capable = arm_smmu_capable,
> .domain_alloc = arm_smmu_domain_alloc,
> @@ -2225,6 +2344,8 @@ static struct iommu_ops arm_smmu_ops = {
> .of_xlate = arm_smmu_of_xlate,
> .get_resv_regions = arm_smmu_get_resv_regions,
> .put_resv_regions = arm_smmu_put_resv_regions,
> + .attach_pasid_table = arm_smmu_attach_pasid_table,
> + .detach_pasid_table = arm_smmu_detach_pasid_table,
> .pgsize_bitmap = -1UL, /* Restricted during device attach */
> };
>
>
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next prev parent reply other threads:[~2019-05-08 14:38 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-08 12:18 [PATCH v7 00/23] SMMUv3 Nested Stage Setup Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 01/23] driver core: add per device iommu param Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 02/23] iommu: introduce device fault data Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 03/23] iommu: introduce device fault report API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 04/23] iommu: Introduce attach/detach_pasid_table API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-15 12:09 ` Jean-Philippe Brucker
2019-05-15 13:06 ` Auger Eric
2019-05-15 15:57 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 06/23] iommu: Introduce bind/unbind_guest_msi Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-08 13:59 ` Robin Murphy
2019-05-10 14:35 ` Auger Eric
2019-04-08 12:18 ` [PATCH v7 07/23] vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 08/23] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 10/23] iommu/arm-smmu-v3: Link domains and devices Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 11/23] iommu/arm-smmu-v3: Maintain a SID->device structure Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-08 14:05 ` Robin Murphy
2019-05-08 18:31 ` Jean-Philippe Brucker
2019-04-08 12:19 ` [PATCH v7 14/23] iommu/smmuv3: Implement cache_invalidate Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 15:01 ` Robin Murphy
2019-05-13 12:16 ` Auger Eric
2019-05-13 14:01 ` Robin Murphy
2019-05-13 14:04 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 15/23] dma-iommu: Implement NESTED_MSI cookie Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 16:42 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 17/23] iommu/smmuv3: Implement bind/unbind_guest_msi Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 18/23] iommu/smmuv3: Report non recoverable faults Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 17:20 ` Robin Murphy
2019-05-13 7:46 ` Auger Eric
2019-05-13 11:54 ` Robin Murphy
2019-05-13 12:32 ` Auger Eric
2019-05-13 13:47 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 19/23] vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 20/23] vfio-pci: Register an iommu fault handler Eric Auger
2019-04-08 12:19 ` Eric Auger
[not found] ` <20190408121911.24103-1-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-04-08 12:18 ` [PATCH v7 05/23] iommu: Introduce cache_invalidate API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-01 10:38 ` Jean-Philippe Brucker
2019-05-01 10:38 ` Jean-Philippe Brucker
2019-05-02 6:58 ` Auger Eric
2019-05-02 6:58 ` Auger Eric
2019-05-02 10:53 ` Jean-Philippe Brucker
2019-05-02 10:53 ` Jean-Philippe Brucker
2019-05-02 16:46 ` Jacob Pan
2019-05-02 16:46 ` Jacob Pan
2019-05-07 11:45 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 09/23] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 12/23] iommu/smmuv3: Get prepared for nested stage support Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 14:24 ` Robin Murphy
2019-05-10 14:34 ` Auger Eric
2019-05-13 11:43 ` Robin Murphy
2019-05-13 14:40 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 13/23] iommu/smmuv3: Implement attach/detach_pasid_table Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 14:38 ` Robin Murphy [this message]
2019-05-10 14:35 ` Auger Eric
2019-05-13 12:04 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 16/23] iommu/smmuv3: Nested mode single MSI doorbell per domain enforcement Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 21/23] vfio_pci: Allow to mmap the fault queue Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 22/23] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 23/23] vfio: Document nested stage control Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-30 7:09 ` [PATCH v7 00/23] SMMUv3 Nested Stage Setup Auger Eric
2019-04-30 7:09 ` Auger Eric
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