Important: qemu security update (Oracle Linux 7)

[15:4.2.1-9.el7]
- Revert 'oslib-posix: refactor memory prealloc threads' (Mark Kanda) [Orabug: 32903662]
- Revert 'oslib-posix: initialize backend memory objects in parallel' (Mark Kanda) [Orabug: 32903662]

[15:4.2.1-8.el7]
- i386/pc: let iterator handle regions below 4G (Joao Martins)

[15:4.2.1-7.el7]
- arm/virt: Add memory hot remove support (Mihai Carabas) [Orabug: 32643506]
- i386/pc: consolidate usable iova iteration (Joao Martins)
- i386/acpi: fix SRAT ranges in accordance to usable IOVA (Joao Martins)
- migration: increase listening socket backlog (Elena Ufimtseva) [Orabug: 32792545]
- multifd: Make multifd_save_setup() get an Error parameter (Juan Quintela)
- multifd: Make multifd_load_setup() get an Error parameter (Juan Quintela)
- migration: fix maybe-uninitialized warning (Marc-Andre Lureau)
- migration: Fix the re-run check of the migrate-incoming command (Yury Kotov)
- multifd: Initialize local variable (Juan Quintela)
- multifd: Be consistent about using uint64_t (Juan Quintela)
- Bug #1829242 correction. (Alexey Romko)
- migration/multifd: fix destroyed mutex access in terminating multifd threads (Jiahui Cen)
- migration/multifd: fix nullptr access in terminating multifd threads (Jiahui Cen)
- migration/multifd: not use multifd during postcopy (Wei Yang)
- migration/multifd: clean pages after filling packet (Wei Yang)
- migration: Make sure that we don't call write() in case of error (Juan Quintela)
- migration: fix multifd_send_pages() next channel (Laurent Vivier)
- migration/multifd: bypass uuid check for initial packet (Elena Ufimtseva) [Orabug: 32610480]
- migration/tls: add error handling in multifd_tls_handshake_thread (Hao Wang)
- migration/tls: fix inverted semantics in multifd_channel_connect (Hao Wang)
- migration/multifd: do not access uninitialized multifd_recv_state (Elena Ufimtseva) [Orabug: 32795384]
- io/channel-tls.c: make qio_channel_tls_shutdown thread-safe (Lukas Straub)
- qemu.spec: Enable qemu-guest-agent RPM for OL7 (Karl Heubaum) [Orabug: 32415543]
- virtio-net: Set mac address to hardware if the peer is vdpa (Cindy Lu)
- net: Add vhost-vdpa in show_netdevs() (Cindy Lu)
- vhost-vdpa: Add qemu_close in vhost_vdpa_cleanup (Cindy Lu)
- hw/virtio/vhost-vdpa: Fix Coverity CID 1432864 (Philippe Mathieu-Daude)
- vhost-vdpa: negotiate VIRTIO_NET_F_STATUS with driver (Si-Wei Liu)
- configure: Fix build dependencies with vhost-vdpa. (Laurent Vivier)
- configure: simplify vhost condition with Kconfig (Marc-Andre Lureau)
- vhost-vdpa: add trace-events (Laurent Vivier)
- dma/pl330: Fix qemu_hexdump() usage in pl330.c (Mark Kanda)
- util/hexdump: introduce qemu_hexdump_line() (Laurent Vivier)
- util/hexdump: Reorder qemu_hexdump() arguments (Philippe Mathieu-Daude)
- util/hexdump: Convert to take a void pointer argument (Philippe Mathieu-Daude)
- net/colo-compare.c: Only hexdump packets if tracing is enabled (Lukas Straub)
- vhost-vdpa: batch updating IOTLB mappings (Jason Wang)
- vhost: switch to use IOTLB v2 format (Jason Wang)
- vhost-vdpa: remove useless variable (Laurent Vivier)
- virtio: vdpa: omit check return of g_malloc (Li Qiang)
- vhost-vdpa: fix indentation in vdpa_ops (Stefano Garzarella)
- virtio-net: check the existence of peer before accessing vDPA config (Jason Wang)
- virtio-pci: fix wrong index in virtio_pci_queue_enabled (Yuri Benditovich)
- virtio-pci: fix virtio_pci_queue_enabled() (Laurent Vivier)
- vhost-vdpa :Fix Coverity CID 1430270 / CID 1420267 (Cindy Lu)
- vhost-vdpa: fix the compile issue without kvm (Cindy Lu)
- vhost-vdpa: introduce vhost-vdpa net client (Cindy Lu)
- vhost-vdpa: introduce vhost-vdpa backend (Cindy Lu)
- linux headers: sync to 5.9-rc4 (Jason Wang)
- Linux headers: update (Cornelia Huck)
- virtio-net: fix rsc_ext compat handling (Cornelia Huck)
- linux-headers: update against Linux 5.7-rc3 (Cornelia Huck)
- virtiofsd: Pull in kernel's fuse.h (Dr. David Alan Gilbert)
- linux-headers: Update (Bharata B Rao)
- vhost_net: introduce set_config & get_config (Cindy Lu)
- vhost: implement vhost_force_iommu method (Cindy Lu)
- vhost: introduce new VhostOps vhost_force_iommu (Cindy Lu)
- vhost: implement vhost_vq_get_addr method (Cindy Lu)
- vhost: introduce new VhostOps vhost_vq_get_addr (Cindy Lu)
- vhost: implement vhost_dev_start method (Cindy Lu)
- vhost: introduce new VhostOps vhost_dev_start (Cindy Lu)
- vhost: check the existence of vhost_set_iotlb_callback (Jason Wang)
- virtio-pci: implement queue_enabled method (Jason Wang)
- virtio-bus: introduce queue_enabled method (Jason Wang)
- vhost_net: use the function qemu_get_peer (Cindy Lu)
- net: introduce qemu_get_peer (Cindy Lu)
- vhost: correctly turn on VIRTIO_F_IOMMU_PLATFORM (Jason Wang)
- imx7-ccm: add digprog mmio write method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- tz-ppc: add dummy read/write methods (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- spapr_pci: add spapr msi read method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- nvram: add nrf51_soc flash read method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- prep: add ppc-parity write method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- vfio: add quirk device write method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- pci-host: designware: add pcie-msi read method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- hw/pci-host: add pci-intack write method (Prasad J Pandit) [Orabug: 31576552] {CVE-2020-15469}
- oslib-posix: initialize backend memory objects in parallel (Mark Kanda) [Orabug: 32555402]
- oslib-posix: refactor memory prealloc threads (Mark Kanda) [Orabug: 32555402]
- oslib-posix: take lock before qemu_cond_broadcast (Bauerchen) [Orabug: 32555402]
- oslib-posix: initialize mutex and condition variable (Paolo Bonzini) [Orabug: 32555402]
- mem-prealloc: optimize large guest startup (bauerchen) [Orabug: 32555402]
- i386: Add the support for AMD EPYC 3rd generation pr