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bh=86xeRISBElX6LZh7Ud5xSXELkhDu63Yaetysf8HUjm8=; b=B/ErAiAC51h+3JcuvKYXQZFjTw59RhvnEv+D/0qJLjrUdH2twsETxiIzpz3LWvDnhDSZju BCCPRaDRMZ2tOv/+iMrz7G5VSJVyI+NxtajIxuGTFSdCTT12zpiDpO9SMHvC6+BTK5467K SJ/XOxaLwFh4HQAhG/yLXLJLayqi6wk= X-MC-Unique: jJohAIVFOMSQPp7JHi4mKA-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, alex.williamson@redhat.com Subject: [RFC v7 09/26] vfio: Force nested if iommu requires it Date: Mon, 16 Nov 2020 19:13:32 +0100 Message-Id: <20201116181349.11908-10-eric.auger@redhat.com> In-Reply-To: <20201116181349.11908-1-eric.auger@redhat.com> References: <20201116181349.11908-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" In case we detect the address space is translated by a virtual IOMMU which requires HW nested paging to integrate with VFIO, let's set up the container with the VFIO_TYPE1_NESTING_IOMMU iommu_type. Signed-off-by: Eric Auger --- v4 -> v5: - fail immediatly if nested is wanted but not supported v2 -> v3: - add "nested only is selected if requested by @force_nested" comment in this patch --- hw/vfio/common.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index c1fdbf17f2..80c68c0446 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1543,27 +1543,38 @@ static void vfio_put_address_space(VFIOAddressSpace= *space) * vfio_get_iommu_type - selects the richest iommu_type (v2 first) */ static int vfio_get_iommu_type(VFIOContainer *container, + bool want_nested, Error **errp) { - int iommu_types[] =3D { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, + int iommu_types[] =3D { VFIO_TYPE1_NESTING_IOMMU, + VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; - int i; + int i, ret =3D -EINVAL; =20 for (i =3D 0; i < ARRAY_SIZE(iommu_types); i++) { if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { - return iommu_types[i]; + if (iommu_types[i] =3D=3D VFIO_TYPE1_NESTING_IOMMU && !want_ne= sted) { + continue; + } + ret =3D iommu_types[i]; + break; } } - error_setg(errp, "No available IOMMU models"); - return -EINVAL; + if (ret < 0) { + error_setg(errp, "No available IOMMU models"); + } else if (want_nested && ret !=3D VFIO_TYPE1_NESTING_IOMMU) { + error_setg(errp, "Nested mode requested but not supported"); + ret =3D -EINVAL; + } + return ret; } =20 static int vfio_init_container(VFIOContainer *container, int group_fd, - Error **errp) + bool want_nested, Error **errp) { int iommu_type, ret; =20 - iommu_type =3D vfio_get_iommu_type(container, errp); + iommu_type =3D vfio_get_iommu_type(container, want_nested, errp); if (iommu_type < 0) { return iommu_type; } @@ -1668,6 +1679,14 @@ static int vfio_connect_container(VFIOGroup *group, = AddressSpace *as, VFIOContainer *container; int ret, fd; VFIOAddressSpace *space; + IOMMUMemoryRegion *iommu_mr; + bool nested =3D false; + + if (as !=3D &address_space_memory && memory_region_is_iommu(as->root))= { + iommu_mr =3D IOMMU_MEMORY_REGION(as->root); + memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_VFIO_NESTED, + (void *)&nested); + } =20 space =3D vfio_get_address_space(as); =20 @@ -1735,12 +1754,13 @@ static int vfio_connect_container(VFIOGroup *group,= AddressSpace *as, QLIST_INIT(&container->giommu_list); QLIST_INIT(&container->hostwin_list); =20 - ret =3D vfio_init_container(container, group->fd, errp); + ret =3D vfio_init_container(container, group->fd, nested, errp); if (ret) { goto free_container_exit; } =20 switch (container->iommu_type) { + case VFIO_TYPE1_NESTING_IOMMU: case VFIO_TYPE1v2_IOMMU: case VFIO_TYPE1_IOMMU: { --=20 2.21.3