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bh=n7WJt6aP9FRh7ANbQTFO8w3xDn6Lth8lc2RIhYZlSKE=; b=NWzEfWiiI6daTCpIPL7YdhqEXFibsdYsYnLCVOvY/KthbnGWcq+MZ2q6b5PjnCY1KqajgX kY5vuhvaf1YAr6FAEe//SwvS32FG7H2OPcI9btqxMNJK059VOJ3O0dGsTAJntn3l5aQWi0 vZfYi9ulg9wowq2usJWY/GmlxvIEt2w= X-MC-Unique: C6CLpOndPY-6i44u3Gc0uw-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, stefanha@redhat.com, fam@euphon.net, philmd@redhat.com, alex.williamson@redhat.com Subject: [RFC 1/3] util/vfio-helpers: Collect IOVA reserved regions Date: Fri, 25 Sep 2020 15:48:43 +0200 Message-Id: <20200925134845.21053-2-eric.auger@redhat.com> In-Reply-To: <20200925134845.21053-1-eric.auger@redhat.com> References: <20200925134845.21053-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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" The IOVA allocator currently ignores host reserved regions. As a result some chosen IOVAs may collide with some of them, resulting in VFIO MAP_DMA errors later on. This happens on ARM where the MSI reserved window quickly is encountered: [0x8000000, 0x8100000]. since 5.4 kernel, VFIO returns the usable IOVA regions. So let's enumerate them in the prospect to avoid them, later on. Signed-off-by: Eric Auger --- util/vfio-helpers.c | 75 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 73 insertions(+), 2 deletions(-) diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 583bdfb36f..8e91beba95 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -40,6 +40,11 @@ typedef struct { uint64_t iova; } IOVAMapping; =20 +struct IOVARange { + uint64_t start; + uint64_t end; +}; + struct QEMUVFIOState { QemuMutex lock; =20 @@ -49,6 +54,8 @@ struct QEMUVFIOState { int device; RAMBlockNotifier ram_notifier; struct vfio_region_info config_region_info, bar_region_info[6]; + struct IOVARange *usable_iova_ranges; + uint8_t nb_iova_ranges; =20 /* These fields are protected by @lock */ /* VFIO's IO virtual address space is managed by splitting into a few @@ -236,6 +243,36 @@ static int qemu_vfio_pci_write_config(QEMUVFIOState *s= , void *buf, int size, int return ret =3D=3D size ? 0 : -errno; } =20 +static void collect_usable_iova_ranges(QEMUVFIOState *s, void *first_cap) +{ + struct vfio_iommu_type1_info_cap_iova_range *cap_iova_range; + struct vfio_info_cap_header *cap =3D first_cap; + void *offset =3D first_cap; + int i; + + while (cap->id !=3D VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE) { + if (cap->next) { + return; + } + offset +=3D cap->next; + cap =3D (struct vfio_info_cap_header *)cap; + } + + cap_iova_range =3D (struct vfio_iommu_type1_info_cap_iova_range *)cap; + + s->nb_iova_ranges =3D cap_iova_range->nr_iovas; + if (s->nb_iova_ranges > 1) { + s->usable_iova_ranges =3D + g_realloc(s->usable_iova_ranges, + s->nb_iova_ranges * sizeof(struct IOVARange)); + } + + for (i =3D 0; i < s->nb_iova_ranges; i++) { + s->usable_iova_ranges[i].start =3D cap_iova_range->iova_ranges[i].= start; + s->usable_iova_ranges[i].end =3D cap_iova_range->iova_ranges[i].en= d; + } +} + static int qemu_vfio_init_pci(QEMUVFIOState *s, const char *device, Error **errp) { @@ -243,10 +280,13 @@ static int qemu_vfio_init_pci(QEMUVFIOState *s, const= char *device, int i; uint16_t pci_cmd; struct vfio_group_status group_status =3D { .argsz =3D sizeof(group_st= atus) }; - struct vfio_iommu_type1_info iommu_info =3D { .argsz =3D sizeof(iommu_= info) }; + struct vfio_iommu_type1_info *iommu_info =3D NULL; + size_t iommu_info_size =3D sizeof(*iommu_info); struct vfio_device_info device_info =3D { .argsz =3D sizeof(device_inf= o) }; char *group_file =3D NULL; =20 + s->usable_iova_ranges =3D NULL; + /* Create a new container */ s->container =3D open("/dev/vfio/vfio", O_RDWR); =20 @@ -310,13 +350,38 @@ static int qemu_vfio_init_pci(QEMUVFIOState *s, const= char *device, goto fail; } =20 + iommu_info =3D g_malloc0(iommu_info_size); + iommu_info->argsz =3D iommu_info_size; + /* Get additional IOMMU info */ - if (ioctl(s->container, VFIO_IOMMU_GET_INFO, &iommu_info)) { + if (ioctl(s->container, VFIO_IOMMU_GET_INFO, iommu_info)) { error_setg_errno(errp, errno, "Failed to get IOMMU info"); ret =3D -errno; goto fail; } =20 + /* + * if the kernel does not report usable IOVA regions, choose + * the legacy [QEMU_VFIO_IOVA_MIN, QEMU_VFIO_IOVA_MAX -1] region + */ + s->nb_iova_ranges =3D 1; + s->usable_iova_ranges =3D g_new0(struct IOVARange, 1); + s->usable_iova_ranges[0].start =3D QEMU_VFIO_IOVA_MIN; + s->usable_iova_ranges[0].end =3D QEMU_VFIO_IOVA_MAX - 1; + + if (iommu_info->argsz > iommu_info_size) { + void *first_cap; + + iommu_info_size =3D iommu_info->argsz; + iommu_info =3D g_realloc(iommu_info, iommu_info_size); + if (ioctl(s->container, VFIO_IOMMU_GET_INFO, iommu_info)) { + ret =3D -errno; + goto fail; + } + first_cap =3D (void *)iommu_info + iommu_info->cap_offset; + collect_usable_iova_ranges(s, first_cap); + } + s->device =3D ioctl(s->group, VFIO_GROUP_GET_DEVICE_FD, device); =20 if (s->device < 0) { @@ -365,8 +430,12 @@ static int qemu_vfio_init_pci(QEMUVFIOState *s, const = char *device, if (ret) { goto fail; } + g_free(iommu_info); return 0; fail: + g_free(s->usable_iova_ranges); + s->nb_iova_ranges =3D 0; + g_free(iommu_info); close(s->group); fail_container: close(s->container); @@ -716,6 +785,8 @@ void qemu_vfio_close(QEMUVFIOState *s) qemu_vfio_undo_mapping(s, &s->mappings[i], NULL); } ram_block_notifier_remove(&s->ram_notifier); + g_free(s->usable_iova_ranges); + s->nb_iova_ranges =3D 0; qemu_vfio_reset(s); close(s->device); close(s->group); --=20 2.21.3 From nobody Wed May 15 13:46:22 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1601042402; cv=none; d=zohomail.com; s=zohoarc; b=RHnSwUNa5JtTZFP8feZxUXJGpTCrWezdpDWXeSnKQLRVecMxPL7bVubNI/CQNBJJ5mbC7DYuboOY0prq+/RPsF7Empik6QVFudeO9zge/twJrji5hW0QpUu8R3ybvWSeJ6U6imDo+htV4hWwb3EddnK90+QvWofvCcRz8Jb60gg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1601042402; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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d=redhat.com; s=mimecast20190719; t=1601041751; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MhsjaAvcc2A8rxRwS3aD1ncZ7PrT1QP4PmosGTDO3t8=; b=MfHEKkxNkuLrZve9tO+3ivk5KhVeSqle9Fe7Wvn+AF4Edy5MgJLG+jAkm5Ba7W3p8r1LIc dunyc3GlgvrXOIeL3XQXsuobTYccYWJuBUT2et4tz4mSJGeGNue81ZfKE3z3braO2qc+3y z5UvHkFRv56gU1QPP+Dr9kIA0jRjUvI= X-MC-Unique: eiyasU3IM82UTT2iBI4_eA-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, stefanha@redhat.com, fam@euphon.net, philmd@redhat.com, alex.williamson@redhat.com Subject: [RFC 2/3] util/vfio-helpers: Dynamically compute the min/max IOVA Date: Fri, 25 Sep 2020 15:48:44 +0200 Message-Id: <20200925134845.21053-3-eric.auger@redhat.com> In-Reply-To: <20200925134845.21053-1-eric.auger@redhat.com> References: <20200925134845.21053-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; 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charset="utf-8" Currently the min/max IOVA are hardcoded to [0x10000, 1 << 39]. Now we dynamically fetch the info from VFIO, if the kernel supports it, let's use the dynamically retrieved value. Signed-off-by: Eric Auger --- util/vfio-helpers.c | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 8e91beba95..567bcf1ded 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -26,11 +26,11 @@ =20 #define QEMU_VFIO_DEBUG 0 =20 +/* + * Min/Max IOVA addresses, only used if VFIO does not report + * the usable IOVA ranges + */ #define QEMU_VFIO_IOVA_MIN 0x10000ULL -/* XXX: Once VFIO exposes the iova bit width in the IOMMU capability inter= face, - * we can use a runtime limit; alternatively it's also possible to do plat= form - * specific detection by reading sysfs entries. Until then, 39 is a safe b= et. - **/ #define QEMU_VFIO_IOVA_MAX (1ULL << 39) =20 typedef struct { @@ -56,6 +56,8 @@ struct QEMUVFIOState { struct vfio_region_info config_region_info, bar_region_info[6]; struct IOVARange *usable_iova_ranges; uint8_t nb_iova_ranges; + uint64_t max_iova; + uint64_t min_iova; =20 /* These fields are protected by @lock */ /* VFIO's IO virtual address space is managed by splitting into a few @@ -63,7 +65,7 @@ struct QEMUVFIOState { * * --------------- <=3D 0 * |xxxxxxxxxxxxx| - * |-------------| <=3D QEMU_VFIO_IOVA_MIN + * |-------------| <=3D min_iova * | | * | Fixed | * | | @@ -75,20 +77,20 @@ struct QEMUVFIOState { * | | * | Temp | * | | - * |-------------| <=3D QEMU_VFIO_IOVA_MAX + * |-------------| <=3D max_iova * |xxxxxxxxxxxxx| * |xxxxxxxxxxxxx| * --------------- * - * - Addresses lower than QEMU_VFIO_IOVA_MIN are reserved as invalid; + * - Addresses lower than min_iova are reserved as invalid; * * - Fixed mappings of HVAs are assigned "low" IOVAs in the range of - * [QEMU_VFIO_IOVA_MIN, low_water_mark). Once allocated they will n= ot be + * [min_iova, low_water_mark). Once allocated they will not be * reclaimed - low_water_mark never shrinks; * * - IOVAs in range [low_water_mark, high_water_mark) are free; * - * - IOVAs in range [high_water_mark, QEMU_VFIO_IOVA_MAX) are volatile + * - IOVAs in range [high_water_mark, max_iova) are volatile * mappings. At each qemu_vfio_dma_reset_temporary() call, the whole= area * is recycled. The caller should make sure I/O's depending on these * mappings are completed before calling. @@ -271,6 +273,8 @@ static void collect_usable_iova_ranges(QEMUVFIOState *s= , void *first_cap) s->usable_iova_ranges[i].start =3D cap_iova_range->iova_ranges[i].= start; s->usable_iova_ranges[i].end =3D cap_iova_range->iova_ranges[i].en= d; } + s->min_iova =3D s->usable_iova_ranges[0].start; + s->max_iova =3D s->usable_iova_ranges[i - 1].end + 1; } =20 static int qemu_vfio_init_pci(QEMUVFIOState *s, const char *device, @@ -362,12 +366,14 @@ static int qemu_vfio_init_pci(QEMUVFIOState *s, const= char *device, =20 /* * if the kernel does not report usable IOVA regions, choose - * the legacy [QEMU_VFIO_IOVA_MIN, QEMU_VFIO_IOVA_MAX -1] region + * the legacy [QEMU_VFIO_IOVA_MIN, QEMU_VFIO_IOVA_MAX - 1] region */ s->nb_iova_ranges =3D 1; s->usable_iova_ranges =3D g_new0(struct IOVARange, 1); s->usable_iova_ranges[0].start =3D QEMU_VFIO_IOVA_MIN; s->usable_iova_ranges[0].end =3D QEMU_VFIO_IOVA_MAX - 1; + s->min_iova =3D QEMU_VFIO_IOVA_MIN; + s->max_iova =3D QEMU_VFIO_IOVA_MAX; =20 if (iommu_info->argsz > iommu_info_size) { void *first_cap; @@ -484,8 +490,8 @@ static void qemu_vfio_open_common(QEMUVFIOState *s) s->ram_notifier.ram_block_added =3D qemu_vfio_ram_block_added; s->ram_notifier.ram_block_removed =3D qemu_vfio_ram_block_removed; ram_block_notifier_add(&s->ram_notifier); - s->low_water_mark =3D QEMU_VFIO_IOVA_MIN; - s->high_water_mark =3D QEMU_VFIO_IOVA_MAX; + s->low_water_mark =3D s->min_iova; + s->high_water_mark =3D s->max_iova; qemu_ram_foreach_block(qemu_vfio_init_ramblock, s); } =20 @@ -734,7 +740,7 @@ int qemu_vfio_dma_reset_temporary(QEMUVFIOState *s) .argsz =3D sizeof(unmap), .flags =3D 0, .iova =3D s->high_water_mark, - .size =3D QEMU_VFIO_IOVA_MAX - s->high_water_mark, + .size =3D s->max_iova - s->high_water_mark, }; trace_qemu_vfio_dma_reset_temporary(s); QEMU_LOCK_GUARD(&s->lock); @@ -742,7 +748,7 @@ int qemu_vfio_dma_reset_temporary(QEMUVFIOState *s) error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); return -errno; } - s->high_water_mark =3D QEMU_VFIO_IOVA_MAX; + s->high_water_mark =3D s->max_iova; return 0; } =20 --=20 2.21.3 From nobody Wed May 15 13:46:22 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1601042161; cv=none; d=zohomail.com; s=zohoarc; b=SS+8YZr3WW2svjNt8zbLXScHDAvrlkT0LXKK2Bowi7KWuHnBNnvlWYiSUUtaHvLp+aBQXlaC2FMxHM2MKEUbv77uwnH+TuKEGEST023S9t9unwj4pI8JTjJxHamIY0j/E6sZj9vZH/0H1EeGNsm7/LGz7iLWYu4RdQahZ8GpgwE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1601042161; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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d=redhat.com; s=mimecast20190719; t=1601041798; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fLvjjbnseEvWZyZlxkrX+W1Hx+rNQ9Jg98KLgwjIUh0=; b=ir8IhASSfIG71X7ZkLp8wJzrmpD7klhPzoOvKNpE5GerdxbH8gp/RxQbD2lYJjGLE+wYuG Z65D3ifu8JFOnQe1MXCBo0Jvnr+U2ht6VdY3BUIv8C6oTEoIaDD2WUfiXq6o392tOuGY8l izfQpDhJqKVEiEd1aVFi+HBI1WnDh40= X-MC-Unique: _u9TE8skM56EMqOW5PgM4Q-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, stefanha@redhat.com, fam@euphon.net, philmd@redhat.com, alex.williamson@redhat.com Subject: [RFC 3/3] util/vfio-helpers: Rework the IOVA allocator to avoid IOVA reserved regions Date: Fri, 25 Sep 2020 15:48:45 +0200 Message-Id: <20200925134845.21053-4-eric.auger@redhat.com> In-Reply-To: <20200925134845.21053-1-eric.auger@redhat.com> References: <20200925134845.21053-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; 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charset="utf-8" Signed-off-by: Eric Auger --- util/vfio-helpers.c | 55 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 51 insertions(+), 4 deletions(-) diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 567bcf1ded..c98d0d882e 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -676,6 +676,48 @@ static bool qemu_vfio_verify_mappings(QEMUVFIOState *s) return true; } =20 +static int +qemu_vfio_find_fixed_iova(QEMUVFIOState *s, size_t size, uint64_t *iova) +{ + int i; + + for (i =3D 0; i < s->nb_iova_ranges; i++) { + if (s->usable_iova_ranges[i].end < s->low_water_mark) { + continue; + } + s->low_water_mark =3D + MAX(s->low_water_mark, s->usable_iova_ranges[i].start); + + if (s->usable_iova_ranges[i].end - s->low_water_mark + 1 >=3D size= ) { + *iova =3D s->low_water_mark; + s->low_water_mark +=3D size; + return 0; + } + } + return -ENOMEM; +} + +static int +qemu_vfio_find_temp_iova(QEMUVFIOState *s, size_t size, uint64_t *iova) +{ + int i; + + for (i =3D s->nb_iova_ranges - 1; i >=3D 0; i--) { + if (s->usable_iova_ranges[i].start > s->high_water_mark) { + continue; + } + s->high_water_mark =3D + MIN(s->high_water_mark, s->usable_iova_ranges[i].end + 1); + + if (s->high_water_mark - s->usable_iova_ranges[i].start + 1 >=3D s= ize) { + *iova =3D s->high_water_mark - size; + s->high_water_mark =3D *iova; + return 0; + } + } + return -ENOMEM; +} + /* Map [host, host + size) area into a contiguous IOVA address space, and = store * the result in @iova if not NULL. The caller need to make sure the area = is * aligned to page size, and mustn't overlap with existing mapping areas (= split @@ -702,7 +744,11 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, si= ze_t size, goto out; } if (!temporary) { - iova0 =3D s->low_water_mark; + if (qemu_vfio_find_fixed_iova(s, size, &iova0)) { + ret =3D -ENOMEM; + goto out; + } + mapping =3D qemu_vfio_add_mapping(s, host, size, index + 1, io= va0); if (!mapping) { ret =3D -ENOMEM; @@ -714,15 +760,16 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, s= ize_t size, qemu_vfio_undo_mapping(s, mapping, NULL); goto out; } - s->low_water_mark +=3D size; qemu_vfio_dump_mappings(s); } else { - iova0 =3D s->high_water_mark - size; + if (qemu_vfio_find_temp_iova(s, size, &iova0)) { + ret =3D -ENOMEM; + goto out; + } ret =3D qemu_vfio_do_mapping(s, host, size, iova0); if (ret) { goto out; } - s->high_water_mark -=3D size; } } if (iova) { --=20 2.21.3