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Thu, 20 Jun 2019 14:40:58 +0000 Received: from kwankhede-dev.nvidia.com (172.20.13.39) by HQMAIL.nvidia.com (172.18.146.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Thu, 20 Jun 2019 14:40:51 +0000 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Thu, 20 Jun 2019 07:40:58 -0700 From: Kirti Wankhede To: , Date: Thu, 20 Jun 2019 20:07:37 +0530 Message-ID: <1561041461-22326-10-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1561041461-22326-1-git-send-email-kwankhede@nvidia.com> References: <1561041461-22326-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1561041658; bh=8hz/KBF+f4hKDwTOMIRwStk2ND+CbU1c/DAfrF19Fl8=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=GbAk5a3UrJmRWROOARo2hYK1i+DawdbEQUX/IGs4veiavd7k9qvkUWTb/3HzlMV5F 4zgqcCptbqOW8vBh/gIt27eCcllwQuv0ExiDW//qrQgtSJ87Sp5iF2eZksFwam00Mp jHxWKAu/G8AeZTt4FYy+yVFGsA/vQHIDHDEPekT1LWJY9+C3VkOwI8j5bLj6NFfPwG 27qN60TV+bBfhV/SqcfRMCHrXKaYnqNUnhzth/fmiYkISjdm7qaC6FJnEUVZbR2FrK clqpYHnLQHtERfhTC5Yglrb4ytjbb1Q31Nb1xQblDP0TfH7I4xWmOQY4RO620hrXp0 1/5QrzhoeuHGQ== X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 X-Received-From: 216.228.121.143 Subject: [Qemu-devel] [PATCH v4 09/13] vfio: Add load state functions to SaveVMHandlers 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: Kirti Wankhede , Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, yan.y.zhao@intel.com, 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, yulei.zhang@intel.com, eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" During _RESUMING device state: - If Vendor driver defines mappable region, mmap migration region. - Load config state. - For data packet, till VFIO_MIG_FLAG_END_OF_STATE is not reached - read data_size from packet, read buffer of data_size - read data_offset from where QEMU should write data. if region is mmaped, write data of data_size to mmaped region. - write data_size. In case of mmapped region, write to data_size indicates kernel driver that data is written in staging buffer. - if region is trapped, pwrite() data of data_size from data_offset. - Repeat above until VFIO_MIG_FLAG_END_OF_STATE. - Unmap migration region. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- hw/vfio/migration.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 153 insertions(+) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 0a2f30872316..e4895f91761d 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -212,6 +212,22 @@ static int vfio_save_device_config_state(QEMUFile *f, = void *opaque) return qemu_file_get_error(f); } =20 +static int vfio_load_device_config_state(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev =3D opaque; + + if (vbasedev->type =3D=3D VFIO_DEVICE_TYPE_PCI) { + vfio_pci_load_config(vbasedev, f); + } + + if (qemu_get_be64(f) !=3D VFIO_MIG_FLAG_END_OF_STATE) { + error_report("Wrong end of block while loading device config space= "); + return -EINVAL; + } + + return qemu_file_get_error(f); +} + /* ---------------------------------------------------------------------- = */ =20 static int vfio_save_setup(QEMUFile *f, void *opaque) @@ -372,12 +388,149 @@ static int vfio_save_complete_precopy(QEMUFile *f, v= oid *opaque) return ret; } =20 +static int vfio_load_setup(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev =3D opaque; + VFIOMigration *migration =3D vbasedev->migration; + int ret =3D 0; + + if (migration->region.buffer.mmaps) { + ret =3D vfio_region_mmap(&migration->region.buffer); + if (ret) { + error_report("Failed to mmap VFIO migration region %d: %s", + migration->region.index, strerror(-ret)); + return ret; + } + } + + ret =3D vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING); + if (ret) { + error_report("Failed to set state RESUMING"); + } + return ret; +} + +static int vfio_load_cleanup(void *opaque) +{ + vfio_save_cleanup(opaque); + return 0; +} + +static int vfio_load_state(QEMUFile *f, void *opaque, int version_id) +{ + VFIODevice *vbasedev =3D opaque; + VFIOMigration *migration =3D vbasedev->migration; + int ret =3D 0; + uint64_t data, data_size; + + data =3D qemu_get_be64(f); + while (data !=3D VFIO_MIG_FLAG_END_OF_STATE) { + switch (data) { + case VFIO_MIG_FLAG_DEV_CONFIG_STATE: + { + ret =3D vfio_load_device_config_state(f, opaque); + if (ret) { + return ret; + } + break; + } + case VFIO_MIG_FLAG_DEV_SETUP_STATE: + { + data =3D qemu_get_be64(f); + if (data =3D=3D VFIO_MIG_FLAG_END_OF_STATE) { + return ret; + } else { + error_report("SETUP STATE: EOS not found 0x%lx", data); + return -EINVAL; + } + break; + } + case VFIO_MIG_FLAG_DEV_DATA_STATE: + { + VFIORegion *region =3D &migration->region.buffer; + void *buf =3D NULL; + bool buffer_mmaped =3D false; + uint64_t data_offset =3D 0; + + data_size =3D qemu_get_be64(f); + if (data_size =3D=3D 0) { + break; + } + + ret =3D pread(vbasedev->fd, &data_offset, sizeof(data_offset), + region->fd_offset + + offsetof(struct vfio_device_migration_info, + data_offset)); + if (ret !=3D sizeof(data_offset)) { + error_report("Failed to get migration buffer data offset %= d", + ret); + return -EINVAL; + } + + if (region->mmaps) { + int i; + + for (i =3D 0; i < region->nr_mmaps; i++) { + if (region->mmaps[i].mmap && + (data_offset >=3D region->mmaps[i].offset) && + (data_offset < region->mmaps[i].offset + + region->mmaps[i].size)) { + buf =3D region->mmaps[i].mmap + (data_offset - + region->mmaps[i].off= set); + buffer_mmaped =3D true; + break; + } + } + } + + if (!buffer_mmaped) { + buf =3D g_malloc0(data_size); + } + + qemu_get_buffer(f, buf, data_size); + + ret =3D pwrite(vbasedev->fd, &data_size, sizeof(data_size), + region->fd_offset + + offsetof(struct vfio_device_migration_info, data_si= ze)); + if (ret !=3D sizeof(data_size)) { + error_report("Failed to set migration buffer data size %d", + ret); + return -EINVAL; + } + + if (!buffer_mmaped) { + ret =3D pwrite(vbasedev->fd, buf, data_size, + region->fd_offset + data_offset); + g_free(buf); + + if (ret !=3D data_size) { + error_report("Failed to set migration buffer %d", ret); + return -EINVAL; + } + } + break; + } + } + + ret =3D qemu_file_get_error(f); + if (ret) { + return ret; + } + data =3D qemu_get_be64(f); + } + + return ret; +} + static SaveVMHandlers savevm_vfio_handlers =3D { .save_setup =3D vfio_save_setup, .save_cleanup =3D vfio_save_cleanup, .save_live_pending =3D vfio_save_pending, .save_live_iterate =3D vfio_save_iterate, .save_live_complete_precopy =3D vfio_save_complete_precopy, + .load_setup =3D vfio_load_setup, + .load_cleanup =3D vfio_load_cleanup, + .load_state =3D vfio_load_state, }; =20 /* ---------------------------------------------------------------------- = */ --=20 2.7.0