From: "Liu, Yi L" <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, eric.auger@redhat.com
Cc: kevin.tian@intel.com, jacob.jun.pan@linux.intel.com,
joro@8bytes.org, ashok.raj@intel.com, yi.l.liu@intel.com,
jun.j.tian@intel.com, yi.y.sun@intel.com,
jean-philippe@linaro.org, peterx@redhat.com,
iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, hao.wu@intel.com
Subject: [PATCH v1 5/8] vfio/type1: Report 1st-level/stage-1 format to userspace
Date: Sun, 22 Mar 2020 05:32:02 -0700 [thread overview]
Message-ID: <1584880325-10561-6-git-send-email-yi.l.liu@intel.com> (raw)
In-Reply-To: <1584880325-10561-1-git-send-email-yi.l.liu@intel.com>
From: Liu Yi L <yi.l.liu@intel.com>
VFIO exposes IOMMU nesting translation (a.k.a dual stage translation)
capability to userspace. Thus applications like QEMU could support
vIOMMU with hardware's nesting translation capability for pass-through
devices. Before setting up nesting translation for pass-through devices,
QEMU and other applications need to learn the supported 1st-lvl/stage-1
translation structure format like page table format.
Take vSVA (virtual Shared Virtual Addressing) as an example, to support
vSVA for pass-through devices, QEMU setup nesting translation for pass-
through devices. The guest page table are configured to host as 1st-lvl/
stage-1 page table. Therefore, guest format should be compatible with
host side.
This patch reports the supported 1st-lvl/stage-1 page table format on the
current platform to userspace. QEMU and other alike applications should
use this format info when trying to setup IOMMU nesting translation on
host IOMMU.
Cc: Kevin Tian <kevin.tian@intel.com>
CC: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
drivers/vfio/vfio_iommu_type1.c | 56 +++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/vfio.h | 1 +
2 files changed, 57 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 9aa2a67..82a9e0b 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2234,11 +2234,66 @@ static int vfio_iommu_type1_pasid_free(struct vfio_iommu *iommu,
return ret;
}
+static int vfio_iommu_get_stage1_format(struct vfio_iommu *iommu,
+ u32 *stage1_format)
+{
+ struct vfio_domain *domain;
+ u32 format = 0, tmp_format = 0;
+ int ret;
+
+ mutex_lock(&iommu->lock);
+ if (list_empty(&iommu->domain_list)) {
+ mutex_unlock(&iommu->lock);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(domain, &iommu->domain_list, next) {
+ if (iommu_domain_get_attr(domain->domain,
+ DOMAIN_ATTR_PASID_FORMAT, &format)) {
+ ret = -EINVAL;
+ format = 0;
+ goto out_unlock;
+ }
+ /*
+ * format is always non-zero (the first format is
+ * IOMMU_PASID_FORMAT_INTEL_VTD which is 1). For
+ * the reason of potential different backed IOMMU
+ * formats, here we expect to have identical formats
+ * in the domain list, no mixed formats support.
+ * return -EINVAL to fail the attempt of setup
+ * VFIO_TYPE1_NESTING_IOMMU if non-identical formats
+ * are detected.
+ */
+ if (tmp_format && tmp_format != format) {
+ ret = -EINVAL;
+ format = 0;
+ goto out_unlock;
+ }
+
+ tmp_format = format;
+ }
+ ret = 0;
+
+out_unlock:
+ if (format)
+ *stage1_format = format;
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
+
static int vfio_iommu_info_add_nesting_cap(struct vfio_iommu *iommu,
struct vfio_info_cap *caps)
{
struct vfio_info_cap_header *header;
struct vfio_iommu_type1_info_cap_nesting *nesting_cap;
+ u32 formats = 0;
+ int ret;
+
+ ret = vfio_iommu_get_stage1_format(iommu, &formats);
+ if (ret) {
+ pr_warn("Failed to get stage-1 format\n");
+ return ret;
+ }
header = vfio_info_cap_add(caps, sizeof(*nesting_cap),
VFIO_IOMMU_TYPE1_INFO_CAP_NESTING, 1);
@@ -2254,6 +2309,7 @@ static int vfio_iommu_info_add_nesting_cap(struct vfio_iommu *iommu,
/* nesting iommu type supports PASID requests (alloc/free) */
nesting_cap->nesting_capabilities |= VFIO_IOMMU_PASID_REQS;
}
+ nesting_cap->stage1_formats = formats;
return 0;
}
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index ed9881d..ebeaf3e 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -763,6 +763,7 @@ struct vfio_iommu_type1_info_cap_nesting {
struct vfio_info_cap_header header;
#define VFIO_IOMMU_PASID_REQS (1 << 0)
__u32 nesting_capabilities;
+ __u32 stage1_formats;
};
#define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
--
2.7.4
next prev parent reply other threads:[~2020-03-22 12:26 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-22 12:31 [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 1/8] vfio: Add VFIO_IOMMU_PASID_REQUEST(alloc/free) Liu, Yi L
2020-03-22 16:21 ` kbuild test robot
2020-03-30 8:32 ` Tian, Kevin
2020-03-30 14:36 ` Liu, Yi L
2020-03-31 5:40 ` Tian, Kevin
2020-03-31 13:22 ` Liu, Yi L
2020-04-01 5:43 ` Tian, Kevin
2020-04-01 5:48 ` Liu, Yi L
2020-03-31 7:53 ` Christoph Hellwig
2020-03-31 8:17 ` Liu, Yi L
2020-03-31 8:32 ` Liu, Yi L
2020-03-31 8:36 ` Liu, Yi L
2020-03-31 9:15 ` Christoph Hellwig
2020-04-02 13:52 ` Jean-Philippe Brucker
2020-04-03 11:56 ` Liu, Yi L
2020-04-03 12:39 ` Jean-Philippe Brucker
2020-04-03 12:44 ` Liu, Yi L
2020-04-02 17:50 ` Alex Williamson
2020-04-03 5:58 ` Tian, Kevin
2020-04-03 15:14 ` Alex Williamson
2020-04-07 4:42 ` Tian, Kevin
2020-04-07 15:14 ` Alex Williamson
2020-04-03 13:12 ` Liu, Yi L
2020-04-03 17:50 ` Alex Williamson
2020-04-07 4:52 ` Tian, Kevin
2020-04-08 0:52 ` Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 2/8] vfio/type1: Add vfio_iommu_type1 parameter for quota tuning Liu, Yi L
2020-03-22 17:20 ` kbuild test robot
2020-03-30 8:40 ` Tian, Kevin
2020-03-30 8:52 ` Liu, Yi L
2020-03-30 9:19 ` Tian, Kevin
2020-03-30 9:26 ` Liu, Yi L
2020-03-30 11:44 ` Tian, Kevin
2020-04-02 17:58 ` Alex Williamson
2020-04-03 8:15 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 3/8] vfio/type1: Report PASID alloc/free support to userspace Liu, Yi L
2020-03-30 9:43 ` Tian, Kevin
2020-04-01 7:46 ` Liu, Yi L
2020-04-01 9:41 ` Auger Eric
2020-04-01 13:13 ` Liu, Yi L
2020-04-02 18:01 ` Alex Williamson
2020-04-03 8:17 ` Liu, Yi L
2020-04-03 17:28 ` Alex Williamson
2020-04-04 11:36 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 4/8] vfio: Check nesting iommu uAPI version Liu, Yi L
2020-03-22 18:30 ` kbuild test robot
2020-03-22 12:32 ` Liu, Yi L [this message]
2020-03-22 16:44 ` [PATCH v1 5/8] vfio/type1: Report 1st-level/stage-1 format to userspace kbuild test robot
2020-03-30 11:48 ` Tian, Kevin
2020-04-01 7:38 ` Liu, Yi L
2020-04-01 7:56 ` Tian, Kevin
2020-04-01 8:06 ` Liu, Yi L
2020-04-01 8:08 ` Tian, Kevin
2020-04-01 8:09 ` Liu, Yi L
2020-04-01 8:51 ` Auger Eric
2020-04-01 12:51 ` Liu, Yi L
2020-04-01 13:01 ` Auger Eric
2020-04-03 8:23 ` Jean-Philippe Brucker
2020-04-07 9:43 ` Liu, Yi L
2020-04-08 1:02 ` Liu, Yi L
2020-04-08 10:27 ` Auger Eric
2020-04-09 8:14 ` Jean-Philippe Brucker
2020-04-09 9:01 ` Auger Eric
2020-04-09 12:47 ` Liu, Yi L
2020-04-10 3:28 ` Auger Eric
2020-04-10 3:48 ` Liu, Yi L
2020-04-10 12:30 ` Liu, Yi L
2020-04-02 19:20 ` Alex Williamson
2020-04-03 11:59 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 6/8] vfio/type1: Bind guest page tables to host Liu, Yi L
2020-03-22 18:10 ` kbuild test robot
2020-03-30 12:46 ` Tian, Kevin
2020-04-01 9:13 ` Liu, Yi L
2020-04-02 2:12 ` Tian, Kevin
2020-04-02 8:05 ` Liu, Yi L
2020-04-03 8:34 ` Jean-Philippe Brucker
2020-04-07 10:33 ` Liu, Yi L
2020-04-09 8:28 ` Jean-Philippe Brucker
2020-04-09 9:15 ` Liu, Yi L
2020-04-09 9:38 ` Jean-Philippe Brucker
2020-04-02 19:57 ` Alex Williamson
2020-04-03 13:30 ` Liu, Yi L
2020-04-03 18:11 ` Alex Williamson
2020-04-04 10:28 ` Liu, Yi L
2020-04-11 5:52 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 7/8] vfio/type1: Add VFIO_IOMMU_CACHE_INVALIDATE Liu, Yi L
2020-03-30 12:58 ` Tian, Kevin
2020-04-01 7:49 ` Liu, Yi L
2020-03-31 7:56 ` Christoph Hellwig
2020-03-31 10:48 ` Liu, Yi L
2020-04-02 20:24 ` Alex Williamson
2020-04-03 6:39 ` Tian, Kevin
2020-04-03 15:31 ` Jacob Pan
2020-04-03 15:34 ` Alex Williamson
2020-04-08 2:28 ` Liu, Yi L
2020-04-16 10:40 ` Liu, Yi L
2020-04-16 12:09 ` Tian, Kevin
2020-04-16 12:42 ` Auger Eric
2020-04-16 13:28 ` Tian, Kevin
2020-04-16 15:12 ` Auger Eric
2020-04-16 14:40 ` Alex Williamson
2020-04-16 14:48 ` Alex Williamson
2020-04-17 6:03 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 8/8] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu, Yi L
2020-03-30 13:18 ` Tian, Kevin
2020-04-01 7:51 ` Liu, Yi L
2020-04-02 20:33 ` Alex Williamson
2020-04-03 13:39 ` Liu, Yi L
2020-03-26 12:56 ` [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L
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