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a="402677024" X-IronPort-AV: E=Sophos;i="6.05,234,1701158400"; d="scan'208";a="402677024" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,234,1701158400"; d="scan'208";a="4443435" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, peterx@redhat.com, jasowang@redhat.com, mst@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, chao.p.peng@intel.com, Zhenzhong Duan , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum Subject: [PATCH rfcv2 18/18] intel_iommu: Block migration if cap is updated Date: Thu, 1 Feb 2024 15:28:18 +0800 Message-Id: <20240201072818.327930-19-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240201072818.327930-1-zhenzhong.duan@intel.com> References: <20240201072818.327930-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.55.52.120; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -56 X-Spam_score: -5.7 X-Spam_bar: ----- X-Spam_report: (-5.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.292, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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 @intel.com) X-ZM-MESSAGEID: 1706772736095100001 Content-Type: text/plain; charset="utf-8" When there is VFIO device and vIOMMU cap/ecap is updated based on host IOMMU cap/ecap, migration should be blocked. Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 72cc8b2c71..7f9ff653b2 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -39,6 +39,7 @@ #include "hw/i386/apic_internal.h" #include "kvm/kvm_i386.h" #include "migration/vmstate.h" +#include "migration/blocker.h" #include "trace.h" =20 #define S_AW_BITS (VTD_MGAW_FROM_CAP(s->cap) + 1) @@ -3829,6 +3830,8 @@ static int vtd_check_legacy_hdev(IntelIOMMUState *s, return 0; } =20 +static Error *vtd_mig_blocker; + static int vtd_check_iommufd_hdev(IntelIOMMUState *s, IOMMUFDDevice *idev, Error **errp) @@ -3860,8 +3863,17 @@ static int vtd_check_iommufd_hdev(IntelIOMMUState *s, tmp_cap |=3D VTD_CAP_MGAW(host_mgaw + 1); } =20 - s->cap =3D tmp_cap; - return 0; + if (s->cap !=3D tmp_cap) { + if (vtd_mig_blocker =3D=3D NULL) { + error_setg(&vtd_mig_blocker, + "cap/ecap update from host IOMMU block migration"); + ret =3D migrate_add_blocker(&vtd_mig_blocker, errp); + } + if (!ret) { + s->cap =3D tmp_cap; + } + } + return ret; } =20 static int vtd_check_hdev(IntelIOMMUState *s, VTDHostIOMMUDevice *vtd_hdev, --=20 2.34.1