linux-kernel - [RFC][PATCH v2 05/13] vfio/type1: Implement set_vmid and get

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Message-ID: <20210831025923.15812-6-nicolinc@nvidia.com>
Date:   Mon, 30 Aug 2021 19:59:15 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
        <alex.williamson@...hat.com>, <cohuck@...hat.com>, <corbet@....net>
CC:     <nicoleotsuka@...il.com>, <vdumpa@...dia.com>,
        <thierry.reding@...il.com>, <linux-tegra@...r.kernel.org>,
        <nwatterson@...dia.com>, <Jonathan.Cameron@...wei.com>,
        <jean-philippe@...aro.org>, <song.bao.hua@...ilicon.com>,
        <eric.auger@...hat.com>, <thunder.leizhen@...wei.com>,
        <yuzenghui@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <kvm@...r.kernel.org>,
        <linux-doc@...r.kernel.org>
Subject: [RFC][PATCH v2 05/13] vfio/type1: Implement set_vmid and get_vmid

Now we have a pair of ->set_vmid() and ->get_vmid() function
pointers. This patch implements them, to exchange VMID value
between vfio container and vfio_iommu_type1.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/vfio/vfio_iommu_type1.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0e9217687f5c..bb5d949bc1af 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -74,6 +74,7 @@ struct vfio_iommu {
 	uint64_t		pgsize_bitmap;
 	uint64_t		num_non_pinned_groups;
 	wait_queue_head_t	vaddr_wait;
+	uint32_t		vmid;
 	bool			v2;
 	bool			nesting;
 	bool			dirty_page_tracking;
@@ -2674,6 +2675,7 @@ static void *vfio_iommu_type1_open(unsigned long arg)
 	iommu->dma_list = RB_ROOT;
 	iommu->dma_avail = dma_entry_limit;
 	iommu->container_open = true;
+	iommu->vmid = VFIO_IOMMU_VMID_INVALID;
 	mutex_init(&iommu->lock);
 	BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier);
 	init_waitqueue_head(&iommu->vaddr_wait);
@@ -3255,6 +3257,27 @@ static void vfio_iommu_type1_notify(void *iommu_data,
 	wake_up_all(&iommu->vaddr_wait);
 }
 
+static int vfio_iommu_type1_get_vmid(void *iommu_data, u32 *vmid)
+{
+	struct vfio_iommu *iommu = iommu_data;
+
+	*vmid = iommu->vmid;
+
+	return 0;
+}
+
+static int vfio_iommu_type1_set_vmid(void *iommu_data, u32 vmid)
+{
+	struct vfio_iommu *iommu = iommu_data;
+
+	if (vmid == VFIO_IOMMU_VMID_INVALID)
+		return -EINVAL;
+
+	iommu->vmid = vmid;
+
+	return 0;
+}
+
 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
 	.name			= "vfio-iommu-type1",
 	.owner			= THIS_MODULE,
@@ -3270,6 +3293,8 @@ static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
 	.dma_rw			= vfio_iommu_type1_dma_rw,
 	.group_iommu_domain	= vfio_iommu_type1_group_iommu_domain,
 	.notify			= vfio_iommu_type1_notify,
+	.set_vmid		= vfio_iommu_type1_set_vmid,
+	.get_vmid		= vfio_iommu_type1_get_vmid,
 };
 
 static int __init vfio_iommu_type1_init(void)
-- 
2.17.1