lkml.org 
[lkml]   [2012]   [Apr]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 2/2] UBUNTU: SAUCE: ata_piix: defer disks to the Hyper-V drivers by default
    Hello.

    On 16-04-2012 15:20, Andy Whitcroft wrote:

    > When we are hosted on a Microsoft Hyper-V hypervisor the guest disks
    > are exposed both via the Hyper-V paravirtualised drivers and via an
    > emulated SATA disk drive. In this case we want to use the paravirtualised
    > drivers if we can as they are much more efficient. Note that the Hyper-V
    > paravirtualised drivers only expose the virtual hard disk devices, the
    > CDROM/DVD devices must still be enumerated.

    > Mark the host controller ATA_HOST_IGNORE_ATA to prevent enumeration of
    > disk devices.

    > BugLink: http://bugs.launchpad.net/bugs/929545
    > BugLink: http://bugs.launchpad.net/bugs/942316
    > Signed-off-by: Andy Whitcroft<apw@canonical.com>
    > ---
    > drivers/ata/ata_piix.c | 38 ++++++++++++++++++++++++++++++++++++++
    > 1 file changed, 38 insertions(+)

    > diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
    > index 68013f9..05e0ffa 100644
    > --- a/drivers/ata/ata_piix.c
    > +++ b/drivers/ata/ata_piix.c
    > @@ -1552,6 +1552,41 @@ static bool piix_broken_system_poweroff(struct pci_dev *pdev)
    > return false;
    > }
    >
    > +static int prefer_ms_hyperv = 1;
    > +module_param(prefer_ms_hyperv, int, 0);
    > +
    > +static void piix_ignore_devices_quirk(struct ata_host *host)
    > +{
    > + static const struct dmi_system_id ignore_devices[] = {
    > + {
    > + /* 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.

    '*' not needed here.

    > + */
    > + .ident = "Hyper-V Virtual Machine",
    > + .matches = {
    > + DMI_MATCH(DMI_SYS_VENDOR,
    > + "Microsoft Corporation"),
    > + DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
    > + },
    > + .driver_data = (void *)ATA_HOST_IGNORE_ATA,
    > + },
    > +
    > + { } /* terminate list */
    > + };
    > + const struct dmi_system_id *dmi = dmi_first_match(ignore_devices);
    > +
    > + if (dmi) {
    > + unsigned long flags = (unsigned long)dmi->driver_data;
    > +
    > + host->flags |= flags;
    > + dev_info(host->dev, "%s detected, device ignore set %08lx\n",

    dev_dbg()?

    MBR, Sergei


    \
     
     \ /
      Last update: 2012-04-16 13:33    [W:0.026 / U:0.928 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site