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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Saucy)
   Importance: High
       Status: Confirmed

** Changed in: linux (Ubuntu Saucy)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Saucy)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1193172

Title:
  Populating Hyper-V MSR for Ubuntu 13.10

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Saucy:
  In Progress

Bug description:
  For new distribution releases the Hyper-V team is trying to better
  populate the Hyper-V guest ID. Our specific goal is to identify any
  given distribution and its release version. With this intent we worked
  with SUSE to include a patch in their upcoming SLES 11 SP3 release.
  The patch is available in the following issue:

  https://bugzilla.novell.com/show_bug.cgi?id=814005

  In case you cannot access the bug then the entire patch is as follows:

  --- linux-3.9-rc5-master.orig/drivers/hv/hv.c
  +++ linux-3.9-rc5-master/drivers/hv/hv.c
  @@ -134,6 +134,8 @@ int hv_init(void)
          int max_leaf;
          union hv_x64_msr_hypercall_contents hypercall_msr;
          void *virtaddr = NULL;
  +       __u8 d1 = 0x10; /* SuSE */
  +       __u16 d2 = 0x0; /* -d of a.b.c-d */

          memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
          memset(hv_context.synic_message_page, 0,
  @@ -148,7 +150,7 @@ int hv_init(void)
          /*
           * Write our OS ID.
           */
  -       hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
  +       hv_context.guestid = generate_guest_id(d1, LINUX_VERSION_CODE, d2);
          wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);

          /* See if the hypercall page is already set */

  We request you to include the same patch for Ubuntu 13.10 with the
  below modifications:

  1. In place of __u8 d1 = 0x10; /* SuSE */ we would request you to add the following line:
  __u8 d1 = 0x80; /* Canonical */

  2. In place of __u16 d2 = 0x0; /* -d of a.b.c-d */ we would request you to add the correct ‘-d’ of the Linux kernel version for Ubuntu 13.10
  __u16 d2 = 0x0; /* -d of a.b.c-d */

  For Ubuntu 13.10, I noticed that uname –r returns “3.9.0-6-generic”.
  We would like to populate d2 with 6. It would be best if you guys
  could automate the process of populating that string.

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