mirror of https://gitee.com/openkylin/qemu.git
1602651833
This patch adds the 'units_per_default_bus' property which allows individual boards to declare their desired index => (bus,unit) mapping for their default HBA, so that boards such as Q35 can specify that its default if_ide HBA, AHCI, only accepts one unit per bus. This property only overrides the mapping for drives matching the block_default_type interface. This patch also adds this property to *all* past and present Q35 machine types. This retroactive addition is justified because the previous erroneous index=>(bus,unit) mappings caused by lack of such a property were not utilized due to lack of initialization code in the Q35 init routine. Further, semantically, the Q35 board type has always had the property that its default HBA, AHCI, only accepts one unit per bus. The new code added to add devices to drives relies upon the accuracy of this mapping. Thus, the property is applied retroactively to reduce complexity of allowing IDE HBAs with different units per bus. Examples: Prior to this patch, all IDE HBAs were assumed to use 2 units per bus (Master, Slave). When using Q35 and AHCI, however, we only allow one unit per bus. -hdb foo.qcow2 would become index=1, or bus=0,unit=1. -hdd foo.qcow2 would become index=3, or bus=1,unit=1. -drive file=foo.qcow2,index=5 becomes bus=2,unit=1. These are invalid for AHCI. They now become, under Q35 only: -hdb foo.qcow2 --> index=1, bus=1, unit=0. -hdd foo.qcow2 --> index=3, bus=3, unit=0. -drive file=foo.qcow2,index=5 --> bus=5,unit=0. The mapping is adjusted based on the fact that the default IF for the Q35 machine type is IF_IDE, and units-per-default-bus overrides the IDE mapping from its default of 2 units per bus to just 1 unit per bus. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-id: 1412187569-23452-4-git-send-email-jsnow@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> |
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| .. | ||
| acpi | ||
| arm | ||
| audio | ||
| block | ||
| char | ||
| cpu | ||
| cris | ||
| i2c | ||
| i386 | ||
| input | ||
| intc | ||
| ipack | ||
| isa | ||
| kvm | ||
| lm32 | ||
| m68k | ||
| mem | ||
| mips | ||
| misc | ||
| net | ||
| nvram | ||
| pci | ||
| pci-host | ||
| ppc | ||
| s390x | ||
| scsi | ||
| sh4 | ||
| sparc | ||
| timer | ||
| tricore | ||
| unicore32 | ||
| usb | ||
| virtio | ||
| xen | ||
| boards.h | ||
| bt.h | ||
| devices.h | ||
| elf_ops.h | ||
| empty_slot.h | ||
| fw-path-provider.h | ||
| hotplug.h | ||
| hw.h | ||
| ide.h | ||
| irq.h | ||
| loader.h | ||
| nmi.h | ||
| pcmcia.h | ||
| ptimer.h | ||
| qdev-core.h | ||
| qdev-dma.h | ||
| qdev-properties.h | ||
| qdev.h | ||
| sd.h | ||
| ssi.h | ||
| stream.h | ||
| sysbus.h | ||
| usb.h | ||