> -----Original Message----- > From: Alan Cox [mailto:alan@xxxxxxxxxxxxxxxxxxx] > Sent: Saturday, April 14, 2012 12:02 PM > To: Andy Whitcroft > Cc: Jeff Garzik; linux-ide@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; KY > Srinivasan; Mike Sterling > Subject: Re: [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default > > O> +#ifdef CONFIG_X86 > > + /* On Hyper-V hypervisors the disks are exposed on both the emulated > > + * SATA controller and on the paravirtualised drivers. The CD/DVD > > + * devices are only exposed on the emulated controller. Request we > > + * ignore ATA devices on this host. > > + */ > > + if (prefer_ms_hyperv && x86_hyper == &x86_hyper_ms_hyperv) { > > + host->flags |= ATA_HOST_IGNORE_ATA; > > + dev_info(&pdev->dev, "Hyper-V hypervisor detected, ignoring > ATA disks\n"); > > + } > > +#endif > > Does hyper-v not set its own unique and identifable pci > subvendor/subdevice ? Number of elements of the virtual BIOS we present the guest can be used to detect that we are running on Hyper-V. Additionally, we are exporting state based on CPU detection which is what Andy is using here. As far as I know these are the only ways to detect that we are running on Hyper-V. Regards, K. Y > > Alan > > -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
