116 lines
4.0 KiB
Diff
116 lines
4.0 KiB
Diff
From 49435d4d592bc890f56b69c2290f890c87b5a103 Mon Sep 17 00:00:00 2001
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From: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Date: Tue, 21 Nov 2023 16:44:05 +0800
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Subject: [PATCH 026/101] vfio/iommufd: Add support for iova_ranges and pgsizes
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eric Auger <eric.auger@redhat.com>
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RH-MergeRequest: 211: IOMMUFD backend backport
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RH-Jira: RHEL-19302 RHEL-21057
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RH-Acked-by: Cédric Le Goater <clg@redhat.com>
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RH-Acked-by: Sebastian Ott <sebott@redhat.com>
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RH-Commit: [25/67] 578af0547d97276ccd4936b574c12118fc70d468 (eauger1/centos-qemu-kvm)
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Some vIOMMU such as virtio-iommu use IOVA ranges from host side to
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setup reserved ranges for passthrough device, so that guest will not
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use an IOVA range beyond host support.
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Use an uAPI of IOMMUFD to get IOVA ranges of host side and pass to
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vIOMMU just like the legacy backend, if this fails, fallback to
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64bit IOVA range.
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Also use out_iova_alignment returned from uAPI as pgsizes instead of
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qemu_real_host_page_size() as a fallback.
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Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Reviewed-by: Cédric Le Goater <clg@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Tested-by: Eric Auger <eric.auger@redhat.com>
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Tested-by: Nicolin Chen <nicolinc@nvidia.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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(cherry picked from commit 714e9affa8ae1d84007c8afde7bb10fef9cb883d)
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Signed-off-by: Eric Auger <eric.auger@redhat.com>
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---
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hw/vfio/iommufd.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 55 insertions(+), 1 deletion(-)
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diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
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index 6d31aeac7b..01b448e840 100644
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--- a/hw/vfio/iommufd.c
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+++ b/hw/vfio/iommufd.c
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@@ -261,6 +261,53 @@ static int iommufd_cdev_ram_block_discard_disable(bool state)
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return ram_block_uncoordinated_discard_disable(state);
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}
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+static int iommufd_cdev_get_info_iova_range(VFIOIOMMUFDContainer *container,
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+ uint32_t ioas_id, Error **errp)
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+{
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+ VFIOContainerBase *bcontainer = &container->bcontainer;
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+ struct iommu_ioas_iova_ranges *info;
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+ struct iommu_iova_range *iova_ranges;
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+ int ret, sz, fd = container->be->fd;
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+
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+ info = g_malloc0(sizeof(*info));
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+ info->size = sizeof(*info);
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+ info->ioas_id = ioas_id;
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+
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+ ret = ioctl(fd, IOMMU_IOAS_IOVA_RANGES, info);
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+ if (ret && errno != EMSGSIZE) {
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+ goto error;
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+ }
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+
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+ sz = info->num_iovas * sizeof(struct iommu_iova_range);
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+ info = g_realloc(info, sizeof(*info) + sz);
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+ info->allowed_iovas = (uintptr_t)(info + 1);
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+
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+ ret = ioctl(fd, IOMMU_IOAS_IOVA_RANGES, info);
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+ if (ret) {
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+ goto error;
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+ }
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+
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+ iova_ranges = (struct iommu_iova_range *)(uintptr_t)info->allowed_iovas;
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+
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+ for (int i = 0; i < info->num_iovas; i++) {
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+ Range *range = g_new(Range, 1);
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+
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+ range_set_bounds(range, iova_ranges[i].start, iova_ranges[i].last);
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+ bcontainer->iova_ranges =
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+ range_list_insert(bcontainer->iova_ranges, range);
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+ }
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+ bcontainer->pgsizes = info->out_iova_alignment;
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+
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+ g_free(info);
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+ return 0;
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+
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+error:
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+ ret = -errno;
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+ g_free(info);
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+ error_setg_errno(errp, errno, "Cannot get IOVA ranges");
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+ return ret;
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+}
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+
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static int iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
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AddressSpace *as, Error **errp)
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{
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@@ -335,7 +382,14 @@ static int iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
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goto err_discard_disable;
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}
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- bcontainer->pgsizes = qemu_real_host_page_size();
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+ ret = iommufd_cdev_get_info_iova_range(container, ioas_id, &err);
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+ if (ret) {
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+ error_append_hint(&err,
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+ "Fallback to default 64bit IOVA range and 4K page size\n");
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+ warn_report_err(err);
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+ err = NULL;
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+ bcontainer->pgsizes = qemu_real_host_page_size();
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+ }
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bcontainer->listener = vfio_memory_listener;
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memory_listener_register(&bcontainer->listener, bcontainer->space->as);
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--
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2.39.3
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