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2015-04-30mtree: also print disabled regionsGerd Hoffmann1-5/+7
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-04-30mtree: tag & indent a bit betterGerd Hoffmann1-5/+6
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-04-30Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell1-0/+7
- miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) - next part in the thread-safe address_space_* saga: atomic access to the bounce buffer and the map_clients list, from Fam - optional support for linking with tcmalloc, also from Fam - reapplying Peter Crosthwaite's "Respect as_translate_internal length clamp" after fixing the SPARC fallout. - build system fix from Wei Liu - small acpi-build and ioport cleanup by myself # gpg: Signature made Wed Apr 29 09:34:00 2015 BST using RSA key ID 78C7AE83 # gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" # gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" # gpg: WARNING: This key is not certified with sufficiently trusted signatures! # gpg: It is not certain that the signature belongs to the owner. # Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1 # Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83 * remotes/bonzini/tags/for-upstream: (22 commits) nbd/trivial: fix type cast for ioctl translate-all: use bitmap helpers for PageDesc's bitmap target-i386: disable LINT0 after reset Makefile.target: prepend $libs_softmmu to $LIBS milkymist: do not modify libs-softmmu configure: Add support for tcmalloc exec: Respect as_translate_internal length clamp ioport: reserve the whole range of an I/O port in the AddressSpace ioport: loosen assertions on emulation of 16-bit ports ioport: remove wrong comment ide: there is only one data port gus: clean up MemoryRegionPortio sb16: remove useless mixer_write_indexw sun4m: fix slavio sysctrl and led register sizes acpi-build: remove dependency from ram_addr.h memory: add memory_region_ram_resize dma-helpers: Fix race condition of continue_after_map_failure and dma_aio_cancel exec: Notify cpu_register_map_client caller if the bounce buffer is available exec: Protect map_client_list with mutex linux-user, bsd-user: Remove two calls to cpu_exec_init_all ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2015-04-27memory: add memory_region_ram_resizePaolo Bonzini1-0/+7
This is a simple MemoryRegion wrapper for qemu_ram_resize. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-04-26memory: Replace io_mem_read/write with memory_region_dispatch_read/writePeter Maydell1-23/+10
Rather than retaining io_mem_read/write as simple wrappers around the memory_region_dispatch_read/write functions, make the latter public and change all the callers to use them, since we need to touch all the callsites anyway to add MemTxAttrs and MemTxResult support. Delete io_mem_read and io_mem_write entirely. (All the callers currently pass MEMTXATTRS_UNSPECIFIED and convert the return value back to bool or ignore it.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2015-04-26memory: Define API for MemoryRegionOps to take attrs and return statusPeter Maydell1-67/+140
Define an API so that devices can register MemoryRegionOps whose read and write callback functions are passed an arbitrary pointer to some transaction attributes and can return a success-or-failure status code. This will allow us to model devices which: * behave differently for ARM Secure/NonSecure memory accesses * behave differently for privileged/unprivileged accesses * may return a transaction failure (causing a guest exception) for erroneous accesses This patch defines the new API and plumbs the attributes parameter through to the memory.c public level functions io_mem_read() and io_mem_write(), where it is currently dummied out. The success/failure response indication is also propagated out to io_mem_read() and io_mem_write(), which retain the old-style boolean true-for-error return. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2015-03-17memory: Move owner-less MemoryRegions to /machine/unattachedAndreas Färber1-1/+1
This cleans up the official /machine namespace. In particular /machine/system[0] and /machine/io[0], as well as entries with non-sanitized node names such as "/machine/qemu extended regs[0]". The actual MemoryRegion names remain unchanged. Acked-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Alistair Francis <alistair.francis@xilinx.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2015-02-11memory: keep the owner of the AddressSpace alive until do_address_space_destroyPaolo Bonzini1-0/+5
This fixes a use-after-free if do_address_space_destroy is executed too late. Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Tested-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-02-10memory: unregister AddressSpace MemoryListener within BQLPaolo Bonzini1-0/+1
address_space_destroy_dispatch is called from an RCU callback and hence outside the iothread mutex (BQL). However, after address_space_destroy no new accesses can hit the destroyed AddressSpace so it is not necessary to observe changes to the memory map. Move the memory_listener_unregister call earlier, to make it thread-safe again. Reported-by: Alex Williamson <alex.williamson@redhat.com> Fixes: 374f2981d1f10bc4307f250f24b2a7ddb9b14be0 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2015-02-02memory: avoid ref/unref in memory_region_findPaolo Bonzini1-5/+5
Do the entire lookup under RCU, which avoids atomic operations in flatview_ref and flatview_unref. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-02-02memory: protect current_map by RCUPaolo Bonzini1-31/+23
Replace the flat_view_mutex with RCU, avoiding futex contention for dataplane on large systems and many iothreads. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-02-02memory: remove assertion on memory_region_destroyJan Kiszka1-1/+0
Now that memory_region_destroy can be called from an RCU callback, checking the BQL-protected global memory_region_transaction_depth does not make much sense. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-08memory: API to allocate resizeable RAM MRMichael S. Tsirkin1-0/+17
Add API to allocate resizeable RAM MR. This looks just like regular RAM generally, but has a special property that only a portion of it (used_length) is actually used, and migrated. This used_length size can change across reboots. Follow up patches will change used_length for such blocks at migration, making it easier to extend devices using such RAM (notably ACPI, but in the future thinkably other ROMs) without breaking migration compatibility or wasting ROM (guest) memory. Device is notified on resize, so it can adjust if necessary. Note: nothing prevents making all RAM resizeable in this way. However, reviewers felt that only enabling this selectively will make some class of errors easier to detect. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-08memory: add memory_region_set_sizeMichael S. Tsirkin1-0/+16
Add API to change MR size. Will be used internally for RAM resize. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2014-11-23memory: expose alignment used for allocating RAM as MemoryRegion APIIgor Mammedov1-0/+5
introduce memory_region_get_alignment() that returns underlying memory block alignment or 0 if it's not relevant/implemented for backend. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-10-31Add skip_dump flag to ignore memory region during dumpNikunj A Dadhania1-0/+10
The PCI MMIO might be disabled or the device in the reset state. Make sure we do not dump these memory regions. Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> Acked-by: Alex Williamson <alex.williamson@redhat.com> CC: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-09memory: add parameter errp to memory_region_init_rom_deviceHu Tao1-2/+3
Add parameter errp to memory_region_init_rom_device and update all call sites to propagate the error. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> [Propagate the error out of realize. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-09memory: add parameter errp to memory_region_init_ramHu Tao1-2/+3
Add parameter errp to memory_region_init_ram and update all call sites to pass in &error_abort. Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-09exec: add parameter errp to qemu_ram_alloc and qemu_ram_alloc_from_ptrHu Tao1-3/+6
Add parameter errp to qemu_ram_alloc and qemu_ram_alloc_from_ptr so that we can handle errors. Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> [Assert ptr != NULL in memory_region_init_ram_ptr. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-04memory: Remove object_property_add_child_array()Peter Crosthwaite1-25/+5
Obsoleted by automatic object_property_add() arrayification. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2014-08-28memory: Lazy init name from QOM name as neededPeter Crosthwaite1-0/+4
To support name retrieval of MemoryRegions that were created dynamically (that is, not via memory_region_init and friends). We cache the name in MemoryRegion's state as object_get_canonical_path_component mallocs the returned value so it's not suitable for direct return to callers. Memory already frees the name field, so this will be garbage collected along with the MR object. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-19Revert "memory: Use canonical path component as the name"Peter Maydell1-1/+3
This reverts commit b0225c2c0d89200a29dc3d0b59d2e87a79cbaeb8 (which breaks building with Xen enabled and also leaks memory). Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-08-19Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell1-20/+8
SCSI changes that enable sending vendor-specific commands via virtio-scsi. Memory changes for QOMification and automatic tracking of MR lifetime. # gpg: Signature made Mon 18 Aug 2014 13:03:09 BST using RSA key ID 9B4D86F2 # gpg: Good signature from "Paolo Bonzini <pbonzini@redhat.com>" # gpg: aka "Paolo Bonzini <bonzini@gnu.org>" * remotes/bonzini/tags/for-upstream: mtree: remove write-only field memory: Use canonical path component as the name memory: Use memory_region_name for name access memory: constify memory_region_name exec: Abstract away ref to memory region names loader: Abstract away ref to memory region names tpm_tis: remove instance_finalize callback memory: remove memory_region_destroy memory: convert memory_region_destroy to object_unparent ioport: split deletion and destruction nic: do not destroy memory regions in cleanup functions vga: do not dynamically allocate chain4_alias sysbus: remove unused function sysbus_del_io qom: object: move unparenting to the child property's release callback qom: object: delete properties before calling instance_finalize virtio-scsi: implement parse_cdb scsi-block, scsi-generic: implement parse_cdb scsi-block: extract scsi_block_is_passthrough scsi-bus: introduce parse_cdb in SCSIDeviceClass and SCSIBusInfo scsi-bus: prepare scsi_req_new for introduction of parse_cdb Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-08-18mtree: remove write-only fieldPaolo Bonzini1-7/+3
ml->printed is never set to true. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-18memory: Use canonical path component as the namePeter Crosthwaite1-3/+1
Rather than having the name as separate state. This prepares support for creating a MemoryRegion dynamically (i.e. without memory_region_init() and friends) and the MemoryRegion still getting a usable name. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-18memory: Use memory_region_name for name accessPeter Crosthwaite1-4/+4
Despite being local to memory.c, use the helper function. This prepares support for fully QOMifiying the name field of MR (which will remove this state from MR completely). Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-18memory: constify memory_region_namePeter Crosthwaite1-1/+1
It doesn't change the MR and some prospective call sites will have const MRs at hand. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-18memory: remove memory_region_destroyPaolo Bonzini1-5/+0
The function is empty after the previous patch, so remove it. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-18memory: convert memory_region_destroy to object_unparentPaolo Bonzini1-1/+0
Explicitly call object_unparent in the few places where we will re-create the memory region. If the memory region is simply being destroyed as part of device teardown, let QOM handle it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-15memory: Update obsolete comment about AddrRange field typeFam Zheng1-2/+1
We are not 64 bit any more since 08dafab4 memory: use 128-bit integers for sizes and intermediates but the comment is forgotten to be updated. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2014-07-01memory: MemoryRegion: Add size propertyPeter Crosthwaite1-0/+13
To allow devices to dynamically resize the device. The motivation is to allow devices with variable size to init their memory_region without size early and then correctly populate size at realize() time. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-01memory: MemoryRegion: Add may-overlap and priority propsPeter Crosthwaite1-0/+24
QOM propertyify the .may-overlap and .priority fields. The setters will re-add the memory as a subregion if needed (i.e. the values change when the memory region is already contained). Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> [Remove setters. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-01memory: MemoryRegion: Add container and addr propsPeter Crosthwaite1-0/+46
Expose the already existing .parent and .addr fields as QOM properties. .parent (i.e. the field describing the memory region that contains this one in Memory hierachy) is renamed "container". This is to avoid confusion with the QOM parent. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> [Remove setters. Do not unref parent on releasing the property. Clean up error propagation. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-01memory: MemoryRegion: replace owner field with QOM parentPaolo Bonzini1-10/+25
The two are now the same. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-01memory: MemoryRegion: QOMifyPeter Crosthwaite1-20/+101
QOMify memory regions as an Object. The former init() and destroy() routines become instance_init() and instance_finalize() resp. memory_region_init() is re-implemented to be: object_initialize() + set fields memory_region_destroy() is re-implemented to call unparent(). Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> [Add newly-created MR as child, unparent on destruction. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-01memory: MemoryRegion: use /machine as default ownerPaolo Bonzini1-1/+1
This will be added (after QOMification) as the QOM parent. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-19hostmem: add property to map memory with MAP_SHAREDPaolo Bonzini1-1/+2
A new "share" property can be used with the "memory-file" backend to map memory with MAP_SHARED instead of MAP_PRIVATE. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19hostmem: allow preallocation of any memory regionPaolo Bonzini1-0/+11
And allow preallocation of file-based memory even without -mem-prealloc. Some care is necessary because -mem-prealloc does not allow disabling preallocation for hostmem-file. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19memory: add error propagation to file-based RAM allocationPaolo Bonzini1-2/+3
Right now, -mem-path will fall back to RAM-based allocation in some cases. This should never happen with "-object memory-file", prepare the code by adding correct error propagation. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> MST: drop \n at end of error messages
2014-06-19memory: move mem_path handling to memory_region_allocate_system_memoryPaolo Bonzini1-5/+16
Like the previous patch did in exec.c, split memory_region_init_ram and memory_region_init_ram_from_file, and push mem_path one step further up. Other RAM regions than system memory will now be backed by regular RAM. Also, boards that do not use memory_region_allocate_system_memory will not support -mem-path anymore. This can be changed before the patches are merged by migrating boards to use the function. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19memory: reorganize file-based allocationPaolo Bonzini1-1/+6
Split the internal interface in exec.c to a separate function, and push the check on mem_path up to memory_region_init_ram. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19memory: add memory_region_is_mapped() APIIgor Mammedov1-1/+9
which allows to check if MemoryRegion is already mapped. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-18memory: Don't call memory_region_update_coalesced_range if nothing changedFam Zheng1-1/+6
With huge number of PCI devices in the system (for example, 200 virtio-blk-pci), this unconditional call can slow down emulation of irrelevant PCI operations drastically, such as a BAR update on a device that has no coalescing region. So avoid it. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-18memory: MemoryRegion: rename parent to containerPaolo Bonzini1-20/+20
Avoid confusion with the QOM parent. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-17memory: MemoryRegion: factor out memory region re-adderPeter Crosthwaite1-10/+16
memory_region_set_address is mostly just a function that deletes and re-adds a memory region. Factor this generic functionality out into a re-usable function. This prepares support for further QOMification of MemoryRegion. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-17memory: MemoryRegion: factor out subregion add functionalityPeter Crosthwaite1-6/+12
Split off the core looping code that actually adds subregions into it's own fn. This prepares support for Memory Region qomification where setting the MR address or parent via QOM will back onto this more minimal function. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> [Rename new function. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-17memory: Simplify mr_add_subregion() if-elsePeter Crosthwaite1-7/+1
This if else is not needed. The previous call to memory_region_add (whether _overlap or not) will always set priority and may_overlap to desired values. And its not possible to get here without having called memory_region_add_subregion due to the null guard on parent. So we can just directly call memory_region_add_subregion_common. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-17memory: Don't update all memory region when ioeventfd changedGonglei1-10/+23
memory mappings don't rely on ioeventfds, there is no need to destroy and rebuild them when manipulating ioeventfds, otherwise it scarifies performance. according to testing result, each ioeventfd deleing needs about 5ms, within which memory mapping rebuilding needs about 4ms. With many Nics and vmchannel in a VM doing migrating, there can be many ioeventfds deleting which increasing downtime remarkably. Signed-off-by: Gonglei <arei.gonglei@huawei.com> Signed-off-by: Herongguang <herongguang.he@huawei.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-05-30memory: Sanity check that no listeners remain on a destroyed AddressSpaceDavid Gibson1-0/+7
At the moment, most AddressSpace objects last as long as the guest system in practice, but that could well change in future. In addition, for VFIO we will be introducing some private per-AdressSpace information, which must be disposed of before the AddressSpace itself is destroyed. To reduce the chances of subtle bugs in this area, this patch adds asssertions to ensure that when an AddressSpace is destroyed, there are no remaining MemoryListeners using that AS as a filter. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2014-03-09memory_region_present: return false if address is not found in child ↵Igor Mammedov1-1/+1
MemoryRegion Windows XP shows COM2 port as non functional in "Device Manager" although no COM2 port backing device is present in QEMU. This regression is really due to 3bb28b7208b349e7a1b326e3c6ef9efac1d462bf? memory: Provide separate handling of unassigned io ports accesses That is caused by the fact that QEMU reports to OSPM that device is present by setting 5th bit in PII4XPM.pci_conf[0x67] register when COM2 doesn't exist. It happens due to memory_region_present(io_as, 0x2f8) returning false positive since 0x2f8 address eventually translates into catchall io_as address space. Fix memory_region_present(parent, addr) by returning true only if addr maps into a MemoryRegion within parent (excluding parent itself), to match its doc comment. While at it fix copy/paste error in memory_region_present() doc comment. Note: this is a temporary hack: we really need better handling for unassigned regions, we should avoid fallback regions since they are bad for performance (breaking radix tree assumption that the data structure is sparsely populated); for memory we need to fix this to implement PCI master abort properly, anyway. Cc: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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