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From: Nicolin Chen <nicolinc@nvidia.com>
To: <will@kernel.org>, <robin.murphy@arm.com>, <joro@8bytes.org>,
	<alex.williamson@redhat.com>, <cohuck@redhat.com>,
	<corbet@lwn.net>
Cc: <nicoleotsuka@gmail.com>, <vdumpa@nvidia.com>,
	<thierry.reding@gmail.com>, <linux-tegra@vger.kernel.org>,
	<nwatterson@nvidia.com>, <Jonathan.Cameron@huawei.com>,
	<jean-philippe@linaro.org>, <song.bao.hua@hisilicon.com>,
	<eric.auger@redhat.com>, <thunder.leizhen@huawei.com>,
	<yuzenghui@huawei.com>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<iommu@lists.linux-foundation.org>, <kvm@vger.kernel.org>,
	<linux-doc@vger.kernel.org>
Subject: [RFC][PATCH v2 01/13] iommu: Add set_nesting_vmid/get_nesting_vmid functions
Date: Mon, 30 Aug 2021 19:59:11 -0700	[thread overview]
Message-ID: <20210831025923.15812-2-nicolinc@nvidia.com> (raw)
In-Reply-To: <20210831025923.15812-1-nicolinc@nvidia.com>

VMID stands for Virtual Machine Identifier, being used to tag
TLB entries to indicate which VM they belong to. This is used
by some IOMMU like SMMUv3 for virtualization case, in nesting
mode.

So this patch adds a pair of new iommu_ops callback functions
with a pair of exported set/get functions to allow VFIO core
to get access of the VMID value in an IOMMU driver.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/iommu.c | 20 ++++++++++++++++++++
 include/linux/iommu.h |  5 +++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3303d707bab4..051f2df36dc0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2774,6 +2774,26 @@ int iommu_enable_nesting(struct iommu_domain *domain)
 }
 EXPORT_SYMBOL_GPL(iommu_enable_nesting);
 
+int iommu_set_nesting_vmid(struct iommu_domain *domain, u32 vmid)
+{
+	if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+		return -EINVAL;
+	if (!domain->ops->set_nesting_vmid)
+		return -EINVAL;
+	return domain->ops->set_nesting_vmid(domain, vmid);
+}
+EXPORT_SYMBOL_GPL(iommu_set_nesting_vmid);
+
+int iommu_get_nesting_vmid(struct iommu_domain *domain, u32 *vmid)
+{
+	if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+		return -EINVAL;
+	if (!domain->ops->get_nesting_vmid)
+		return -EINVAL;
+	return domain->ops->get_nesting_vmid(domain, vmid);
+}
+EXPORT_SYMBOL_GPL(iommu_get_nesting_vmid);
+
 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
 		unsigned long quirk)
 {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d2f3435e7d17..bda6b3450909 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -163,6 +163,7 @@ enum iommu_dev_features {
 };
 
 #define IOMMU_PASID_INVALID	(-1U)
+#define IOMMU_VMID_INVALID	(-1U)
 
 #ifdef CONFIG_IOMMU_API
 
@@ -269,6 +270,8 @@ struct iommu_ops {
 	void (*probe_finalize)(struct device *dev);
 	struct iommu_group *(*device_group)(struct device *dev);
 	int (*enable_nesting)(struct iommu_domain *domain);
+	int (*set_nesting_vmid)(struct iommu_domain *domain, u32 vmid);
+	int (*get_nesting_vmid)(struct iommu_domain *domain, u32 *vmid);
 	int (*set_pgtable_quirks)(struct iommu_domain *domain,
 				  unsigned long quirks);
 
@@ -500,6 +503,8 @@ extern int iommu_group_id(struct iommu_group *group);
 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
 int iommu_enable_nesting(struct iommu_domain *domain);
+int iommu_set_nesting_vmid(struct iommu_domain *domain, u32 vmid);
+int iommu_get_nesting_vmid(struct iommu_domain *domain, u32 *vmid);
 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
 		unsigned long quirks);
 
-- 
2.17.1


  reply	other threads:[~2021-08-31  3:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31  2:59 [RFC][PATCH v2 00/13] iommu/arm-smmu-v3: Add NVIDIA implementation Nicolin Chen
2021-08-31  2:59 ` Nicolin Chen [this message]
2021-08-31  2:59 ` [RFC][PATCH v2 02/13] vfio: add VFIO_IOMMU_GET_VMID and VFIO_IOMMU_SET_VMID Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 03/13] vfio: Document VMID control for IOMMU Virtualization Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 04/13] vfio: add set_vmid and get_vmid for vfio_iommu_type1 Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 05/13] vfio/type1: Implement set_vmid and get_vmid Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 06/13] vfio/type1: Set/get VMID to/from iommu driver Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 07/13] iommu/arm-smmu-v3: Add shared VMID support for NESTING Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 08/13] iommu/arm-smmu-v3: Add VMID alloc/free helpers Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 09/13] iommu/arm-smmu-v3: Pass dev pointer to arm_smmu_detach_dev Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 10/13] iommu/arm-smmu-v3: Pass cmdq pointer in arm_smmu_cmdq_issue_cmdlist() Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 11/13] iommu/arm-smmu-v3: Add implementation infrastructure Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 12/13] iommu/arm-smmu-v3: Add support for NVIDIA CMDQ-Virtualization hw Nicolin Chen
2021-08-31  2:59 ` [RFC][PATCH v2 13/13] iommu/nvidia-smmu-v3: Add mdev interface support Nicolin Chen
2021-08-31 16:15 ` [RFC][PATCH v2 00/13] iommu/arm-smmu-v3: Add NVIDIA implementation Alex Williamson
2021-09-01  6:55   ` Tian, Kevin
2021-09-02 14:45     ` Jason Gunthorpe
2021-09-02 22:27       ` Tian, Kevin
2021-09-16 18:21         ` Nicolin Chen

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