Hi Jan and there, I want to disable IDE BMDMA in Qemu/KVM and let guest OS uses only PIO mode. Are there any configurations in Qemu or KVM to disable the hardware support of DMA? I have tried to disable IDE DMA in guest OS booting params as follows: ide-core.nodma=0.0 libata.dma=0 ide=nodma ide0=nodma But I can also get the followings in dmesg: [0.533276] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc040 irq 14 [0.533641] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc048 irq 15 and I do tracked irq 14 and irq 15 in ioapic_deliver when read/write disk. How could I totally disable IDE BMDMA from guest's boot time? Thanks, Arthur -- Arthur Chunqi Li Department of Computer Science School of EECS Peking University Beijing, China -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
