[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Change spec of callback IRQ for PV-on-HVM onIA64
Hi Kevin, You (kevin.tian) said: >> * pvdrv.patch2 >> - Modify to change the spec of callback IRQ in PV-driver side. >> - This patch brakes compatibility with previous version on IA64. >> >> I tested with our simple test of PV-on-HVM on RHEL4 U2 for IA64 >>with hypervisor side modification. >> >>Thanks, >>- Tsunehisa Doi > > Maybe I'm missing something and you can help me understand. :-) > Whatever the value is mangled in pdev->irq, you should always > keep following two instances same: > if ((ret = request_irq(pdev->irq, evtchn_interrupt, SA_SHIRQ,... > and > if ((ret = set_callback_irq(pdev->irq))) In x86-linux, two instances are same. But in IA64-linux, previous one is a external interrupt vector for xen-platform interruption. Although latter one is a hardware IRQ id. Both values are not same in IA64-linux. > Before your patch, say pdev->irq is 0x27 (ISA irq 9), platform-pci > driver binds handler to 0x27 and xen will inject by callback_irq 0x27. > However in your patch, request_irq is still using pdev->irq (0x27) > while set_callback_irq instead wants (0x9). In this case, how can you > still make things working when two sides don't match... With the modification of hypervisor side, the callback_irq(it's hardware IRQ) becomes to be converted to external interrupt vector with a emulator of IOSAPIC. Thanks, - Tsunehisa Doi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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