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bh=JEcE8EVRSkjDCsOnpmCh8P7aPJDqjwjz81BgQ6KJPlA=; b=cU4sdsUnph+ESvTUdeLLtxMxIDdzl/j1QwMRuAKvGDIlhFxv5b/l08BC6Os3wL+AecOLwe MndGBYsiBgIHllG7p8C7j4KfcQ0jWdj54lN9B7bf9VEq5nbXD/JC0jc9JTjj0iiAWoxFqc OntRix38u1PBOof/i02Yfpo/UbnOHLM= X-MC-Unique: X4RVILjWOD6etaGeVpAgZQ-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, jean-philippe@linaro.org, peter.maydell@linaro.org, mst@redhat.com Cc: clg@redhat.com, alex.williamson@redhat.com Subject: [PATCH] virtio-iommu: Use qemu_real_host_page_mask as default page_size_mask Date: Thu, 21 Dec 2023 08:45:05 -0500 Message-Id: <20231221134505.100916-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.061, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1703166349769100003 Content-Type: text/plain; charset="utf-8" We used to set default page_size_mask to qemu_target_page_mask() but with VFIO assignment it makes more sense to use the actual host page mask instead. So from now on qemu_real_host_page_mask() will be used as a default. To be able to migrate older code, we increase the vmstat version_id to 3 and if an older incoming v2 stream is detected we set the previous default value. The new default is well adapted to configs where host and guest have the same page size. This allows to fix hotplugging VFIO devices on a 64kB guest and a 64kB host. This test case has been failing before and even crashing qemu with hw_error("vfio: DMA mapping failed, unable to continue") in VFIO common). Indeed the hot-attached VFIO device would call memory_region_iommu_set_page_size_mask with 64kB mask whereas after the granule was frozen to 4kB on machine init done. Now this works. However the new default will prevent 4kB guest on 64kB host because the granule will be set to 64kB which would be larger than the guest page size. In that situation, the virtio-iommu driver fails the viommu_domain_finalise() with "granule 0x10000 larger than system page zie 0x1000". The current limitation of global granule in the virtio-iommu should be removed and turned into per domain granule. But until we get this upgraded, this new default is probably better because I don't think anyone is currently interested in running a 4kB page size guest with virtio-iommu on a 64kB host. However supporting 64kB guest on 64kB host with virtio-iommu and VFIO looks a more important feature. Signed-off-by: Eric Auger Reviewed-by: Jean-Philippe Brucker Tested-by: Jean-Philippe Brucker --- hw/virtio/virtio-iommu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 9d463efc52..b77e3644ea 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -1313,7 +1313,7 @@ static void virtio_iommu_device_realize(DeviceState *= dev, Error **errp) * in vfio realize */ s->config.bypass =3D s->boot_bypass; - s->config.page_size_mask =3D qemu_target_page_mask(); + s->config.page_size_mask =3D qemu_real_host_page_mask(); s->config.input_range.end =3D UINT64_MAX; s->config.domain_range.end =3D UINT32_MAX; s->config.probe_size =3D VIOMMU_PROBE_SIZE; @@ -1491,13 +1491,16 @@ static int iommu_post_load(void *opaque, int versio= n_id) * still correct. */ virtio_iommu_switch_address_space_all(s); + if (version_id <=3D 2) { + s->config.page_size_mask =3D qemu_target_page_mask(); + } return 0; } =20 static const VMStateDescription vmstate_virtio_iommu_device =3D { .name =3D "virtio-iommu-device", .minimum_version_id =3D 2, - .version_id =3D 2, + .version_id =3D 3, .post_load =3D iommu_post_load, .fields =3D (VMStateField[]) { VMSTATE_GTREE_DIRECT_KEY_V(domains, VirtIOIOMMU, 2, --=20 2.27.0