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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1719390496; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=p+DGD3fPGv2kOWXJer3oVP7HLhSLO1OZboYmYmKyNY0=; b=AiQsN3ztP4+1XaWFDY/P0c5MXkP2dEd4vXyfPJA6C+5PijIWkbjTRmF6jIfgK7KhMQZVsW 9V43UgUX953HwqAhqkAd1hVqNsuHCcaYvZmiLqs0aPoKaUHJoa38YeE0SbdkgGqcC26tvp +AXdsEq7bBcfsjU2hW7n4mDzzCYspLk= X-MC-Unique: I5ffquUuNPG9d9BrVpB2_g-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, mst@redhat.com, jean-philippe@linaro.org, peter.maydell@linaro.org, clg@redhat.com, yanghliu@redhat.com, zhenzhong.duan@intel.com, alex.williamson@redhat.com Subject: [PATCH 7/7] virtio-iommu: Revert transient enablement of IOMMU MR in bypass mode Date: Wed, 26 Jun 2024 10:26:52 +0200 Message-ID: <20240626082727.1278530-8-eric.auger@redhat.com> In-Reply-To: <20240626082727.1278530-1-eric.auger@redhat.com> References: <20240626082727.1278530-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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: 11 X-Spam_score: 1.1 X-Spam_bar: + X-Spam_report: (1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.151, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: 1719390540027100003 Content-Type: text/plain; charset="utf-8" In 94df5b2180d6 ("virtio-iommu: Fix 64kB host page size VFIO device assignment"), in case of bypass mode, we transiently enabled the IOMMU MR to allow the set_page_size_mask() to be called and pass information about the page size mask constraint of cold plugged VFIO devices. Now we do not use the IOMMU MR callback anymore, we can just get rid of this hack. Signed-off-by: Eric Auger Reviewed-by: C=C3=A9dric Le Goater --- hw/virtio/virtio-iommu.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index b24e10de81..f87359b3e7 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -1385,18 +1385,6 @@ static void virtio_iommu_freeze_granule(Notifier *no= tifier, void *data) VirtIOIOMMU *s =3D container_of(notifier, VirtIOIOMMU, machine_done); int granule; =20 - if (likely(s->config.bypass)) { - /* - * Transient IOMMU MR enable to collect page_size_mask requirements - * through memory_region_iommu_set_page_size_mask() called by - * VFIO region_add() callback - */ - s->config.bypass =3D false; - virtio_iommu_switch_address_space_all(s); - /* restore default */ - s->config.bypass =3D true; - virtio_iommu_switch_address_space_all(s); - } s->granule_frozen =3D true; granule =3D ctz64(s->config.page_size_mask); trace_virtio_iommu_freeze_granule(BIT_ULL(granule)); --=20 2.41.0