On Mon, Feb 01, 2010 at 06:39:35PM +0000, Daniel P. Berrange wrote:
The current QEMU code allocates PCI addresses incrementally starting at 4. This is not satisfactory because the user may have given some addresses in their XML config, which need to be skipped over when allocating addresses to remaining devices.
Ah, right !
It is thus neccessary to maintain a list of already allocated PCI addresses and then only allocate ones that remain unused. This is also required for domain device hotplug to work properly later.
* src/qemu/qemu_conf.c, src/qemu/qemu_conf.h: Add APIs for creating list of existing PCI addresses, and allocating new addresses. Refactor address assignment to use this code * src/qemu/qemu_driver.c: Pull PCI address assignment up into the qemuStartVMDaemon() method, as a prelude to moving it into the 'define' method. Update list of allocated addresses when connecting to a running VM at daemon startup. * tests/qemuxml2argvtest.c, tests/qemuargv2xmltest.c, tests/qemuxml2xmltest.c: Remove USB product test since all passthrough is done based on address * tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-product.args, tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-product.xml: Kil unused data files [...]
+ addr = qemuPCIAddressAsString(&dev); + if (!addr) + return -1; + + if (virHashLookup(addrs->used, addr)) { + qemudReportError(NULL, NULL, NULL, VIR_ERR_INTERNAL_ERROR, + _("unable to reserve PCI address %s"), addr); + VIR_FREE(addr); + return -1; + } + + if (virHashAddEntry(addrs->used, addr, addr)) { + VIR_FREE(addr); + return -1; + }
is using a hash table really that simpler in that case ? I doubt we need an optimized lookup, and this mean always saving to a standardized string to then do string comparisons instead of directly checking domain/bus/slot values. But that's a minor point. ACK, Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/