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Wed, 6 May 2020 22:27:39 +0000 (UTC) Date: Wed, 6 May 2020 16:27:38 -0600 From: Alex Williamson To: Kirti Wankhede Subject: Re: [PATCH Kernel v18 6/7] vfio iommu: Add migration capability to report supported features Message-ID: <20200506162738.6e08dbf2@w520.home> In-Reply-To: <1588607939-26441-7-git-send-email-kwankhede@nvidia.com> References: <1588607939-26441-1-git-send-email-kwankhede@nvidia.com> <1588607939-26441-7-git-send-email-kwankhede@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Received-SPF: pass client-ip=207.211.31.120; envelope-from=alex.williamson@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/06 16:22:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, 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_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, cjia@nvidia.com, kvm@vger.kernel.org, eskultet@redhat.com, ziye.yang@intel.com, qemu-devel@nongnu.org, cohuck@redhat.com, shuangtai.tst@alibaba-inc.com, dgilbert@redhat.com, zhi.a.wang@intel.com, mlevitsk@redhat.com, pasic@linux.ibm.com, aik@ozlabs.ru, eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, yan.y.zhao@intel.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, 4 May 2020 21:28:58 +0530 Kirti Wankhede wrote: > Added migration capability in IOMMU info chain. > User application should check IOMMU info chain for migration capability > to use dirty page tracking feature provided by kernel module. > > Signed-off-by: Kirti Wankhede > --- > drivers/vfio/vfio_iommu_type1.c | 15 +++++++++++++++ > include/uapi/linux/vfio.h | 14 ++++++++++++++ > 2 files changed, 29 insertions(+) > > diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c > index 8b27faf1ec38..b38d278d7bff 100644 > --- a/drivers/vfio/vfio_iommu_type1.c > +++ b/drivers/vfio/vfio_iommu_type1.c > @@ -2378,6 +2378,17 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu, > return ret; > } > > +static int vfio_iommu_migration_build_caps(struct vfio_info_cap *caps) > +{ > + struct vfio_iommu_type1_info_cap_migration cap_mig; > + > + cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION; > + cap_mig.header.version = 1; > + cap_mig.flags = VFIO_IOMMU_INFO_CAPS_MIGRATION_DIRTY_PAGE_TRACK; > + > + return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig)); > +} > + > static long vfio_iommu_type1_ioctl(void *iommu_data, > unsigned int cmd, unsigned long arg) > { > @@ -2427,6 +2438,10 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, > if (ret) > return ret; > > + ret = vfio_iommu_migration_build_caps(&caps); > + if (ret) > + return ret; > + > if (caps.size) { > info.flags |= VFIO_IOMMU_INFO_CAPS; > > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index e3cbf8b78623..df9ce8aaafab 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -1013,6 +1013,20 @@ struct vfio_iommu_type1_info_cap_iova_range { > struct vfio_iova_range iova_ranges[]; > }; > > +/* > + * The migration capability allows to report supported features for migration. > + * > + * The structures below define version 1 of this capability. > + */ > +#define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION 1 > + > +struct vfio_iommu_type1_info_cap_migration { > + struct vfio_info_cap_header header; > + __u32 flags; > + /* supports dirty page tracking */ > +#define VFIO_IOMMU_INFO_CAPS_MIGRATION_DIRTY_PAGE_TRACK (1 << 0) > +}; > + What about exposing the maximum supported dirty bitmap size and the supported page sizes? Thanks, Alex > #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) > > /**