Виктор Мясников ( Victor Miasnikov)

. . .

While 3.2 is quite ok, 3.3 still has a bunch of fixes that look scary - and are missing in 3.2 still (kernel oopses, memory leaks etc.)

Have fun with Arch on Hyper-V - there is a patch underway that will also remove the 4 vCPU limit that is still yet imposed by 2008 R2 and will go awa with Windows 8 Servers.
. . .
But I ( Mathieu Simon) don't think this patch is already in 3.3.
You can read here:
http://groups.google.com/group/linux.kernel/browse_thread/thread/26e70c50d24fd38c/9aa8eea98838fbf3?show_docid=9aa8eea98838fbf3

. . .
--

----- Original Message -----
From: "Victor Miasnikov"
To: "Mathieu Simon"
Sent: Thursday, February 16, 2012 5:51 PM

. . . Thanks You for very interesant and usefull blog and other work

>> If you dont have X.org on a Server VM, you can quietly ignore this module anyway. – I’ll let Puppet do the work or SSH to the box first

If need mouse in old-kernel Linux -- simple use directly connect via Hyper-V MMC from physically Windows-workstantion

. . .
--

. . .
Can solve problem someone a-la this

Var A Or "Ubuntu Way"

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/929545

==
. . .
The strategies Microsoft currently use on other distributions are based on setting up modprobe rules but these will not work on Ubuntu
as the native (ata*) driver is built directly into the kernel.
. . .
2. Modify the ata driver to recognize that when hosted on Hyper-V, it
should not control the disks.

. . .
Andy Whitcroft (apw) wrote on 2012-02-10:
I . . . add hyper-v detection to the ata_piix driver. This basically defers handling to hyper-v by default if the hypervisor is detected. I have also added an override to allow this to be suppressed from the command line. Could someone with a hyper-v based cloud test the kernels below and report whether they work here. Could you please include a dmesg of a successful boot so I can confirm the detection has recorded itself correctly. It would also be helpful to get a boot with ata_piix.prefer_ms_hyperv=0,
==

http://www.ubuntuupdates.org/package/core/precise/main/base/linux-image-3.2.0-17-generic

=>
===
...
* deviations -- note the source of the Hyper-V updates
* SAUCE: ata_piix: defer to the Hyper-V drivers by default
- LP: #929545
...
===

==

http://people.canonical.com/~apw/lp929545-precise/0001-ata_piix-defer-to-the-Hyper-V-drivers-by-default.patch

===
From 9c2e8890fee7c07540e477bac63984a53a903455 Mon Sep 17 00:00:00 2001
From: Andy Whitcroft
Date: Fri, 10 Feb 2012 12:17:14 +0000
Subject: [PATCH 01/70] ata_piix: defer to the Hyper-V drivers by default

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.

Add check for the Hyper-V hypervisor during initialisation and avoid
initialising. Also adds a module parameter to override this behaviour.

BugLink: http://bugs.launchpad.net/bugs/929545
Signed-off-by: Andy Whitcroft
---
debian/rules.d/1-maintainer.mk | 1 +
drivers/ata/ata_piix.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/debian/rules.d/1-maintainer.mk b/debian/rules.d/1-maintainer.mk
index 975cd79..6477b68 100644
--- a/debian/rules.d/1-maintainer.mk
+++ b/debian/rules.d/1-maintainer.mk
@@ -92,6 +92,7 @@ prev_release="$(release)-$(prev_revision)"
printchanges:
@baseCommit=$$(git log --pretty=format:'%H %s' | \
awk '/UBUNTU: '".*Ubuntu-$(prev_release)"'$$/ { print $$1; exit }'); \
+ echo "$$baseCommit" ; \
git log "$$baseCommit"..HEAD | \
perl -w -f $(DROOT)/scripts/misc/git-ubuntu-log $(ubuntu_log_opts)

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 69ac373..f8280c5 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -94,6 +94,9 @@
#include
#include
#include
+#ifdef CONFIG_X86
+#include
+#endif

#define DRV_NAME "ata_piix"
#define DRV_VERSION "2.13"
@@ -1666,9 +1669,21 @@ static void piix_remove_one(struct pci_dev *pdev)
ata_pci_remove_one(pdev);
}

+static int prefer_ms_hyperv = 1;
+
static int __init piix_init(void)
{
int rc;
+#ifdef CONFIG_X86
+ /*
+ * If we are on the Microsoft Hyper-V platform deferr to its block
+ * drivers.
+ */
+ if (prefer_ms_hyperv && x86_hyper == &x86_hyper_ms_hyperv) {
+ pr_info("ata_piix: deferring to Hyper-V hypervisor");
+ return -ENODEV;
+ }
+#endif

DPRINTK("pci_register_driver\n");
rc = pci_register_driver(&piix_pci_driver);
@@ -1688,3 +1703,5 @@ static void __exit piix_exit(void)

module_init(piix_init);
module_exit(piix_exit);
+
+module_param(prefer_ms_hyperv, int, 0);
--
1.7.9
===
==

==

http://people.canonical.com/~apw/lp929545-precise/0002-debug.patch

===
From b58963a158e54b716bd6e43de08df4503f273a00 Mon Sep 17 00:00:00 2001
From: Andy Whitcroft
Date: Fri, 10 Feb 2012 19:55:16 +0000
Subject: [PATCH 02/70] debug

---
drivers/ata/ata_piix.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index f8280c5..b022548 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1682,6 +1682,8 @@ static int __init piix_init(void)
if (prefer_ms_hyperv && x86_hyper == &x86_hyper_ms_hyperv) {
pr_info("ata_piix: deferring to Hyper-V hypervisor");
return -ENODEV;
+ } else {
+ pr_info("ata_piix: no Hyper-V hypervisor found");
}
#endif

--
1.7.9
===
==

Var B Or "OpenSUSE Way"

http://patchwork.ozlabs.org/patch/112939/

===
...
Olaf Hering - Sept. 1, 2011, 3:43 p.m.
On Wed, Aug 31, Olaf Hering wrote:

> After some more testing it looks like the hv_blkvsc driver claimed the
> ide major #3, so the ide_core could not bind to the emulated IDE
> hardware. The modprobe.conf rules prevented that ata_piix gets loaded.
> If I force a module load order of 'ata_piix ;hv_blkvsc' both ata_piix
> and hv_blkvsc will bind to the same drive, just as shown in my previous
> mail. So there is appearently no way to shutdown the IDE ports like it
> is done with xen_emul_unplug= option for Xen guests.
>
> Maybe some hack is needed for a hyper-v specific unplug if Windows does
> indeed lack that feature. Now that ata_piix is compiled into the kernel,
> there is nothing to a modprobe.conf rule can "fix".

Here is an attempt to ignore disks in a hyper-v disks, and let ata_piix
handle only the configured cdrom devices (iso of physical).
If the disks are not ignored, they will appear twice, once through
ata_piix and once through hv_storvsc.

Once hv_storvsc can also handle the configured cdrom devices, the added
piix_pata_read_id() function can be removed again. Only the check in
piix_init() or something similar needs to be done.

Maybe there is a better way enable only ATA_DEV_ATAPI?

Signed-off-by: Olaf Hering

. . .

Patch

--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -98,6 +98,10 @@
#define DRV_NAME "ata_piix"
#define DRV_VERSION "2.13"

+#if defined(CONFIG_HYPERV_STORAGE) || defined(CONFIG_HYPERV_STORAGE_MODULE)
+#define PIIX_IGNORE_ATA_ON_HYPERV 1
+#endif
+

. . .

. . .
With regards to the ata_piix changes, we will try to push that upstream shortly.

K. Y