This bug was fixed in the package linux-azure - 5.0.0-1016.17
---------------
linux-azure (5.0.0-1016.17) disco; urgency=medium
* disco/linux-azure: 5.0.0-1016.17 -proposed tracker (LP: #1840275)
* Azure: Backport vIOMMU driver (increase vCPU limits) (LP: #1826447)
- x86/Hyper-V: Set x2apic destination mode to physical when x2apic is
available
- iommu/hyper-v: Add Hyper-V stub IOMMU driver
- PCI: hv: Replace hv_vp_set with hv_vpset
- PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()
- [Config] linux-azure: CONFIG_HYPERV_IOMMU=y
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
-- Marcelo Henrique Cerri <marcelo.ce...@canonical.com> Thu, 15 Aug
2019 12:07:56 -0300
** Changed in: linux-azure (Ubuntu Disco)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1826447
Title:
Azure: Backport vIOMMU driver (increase vCPU limits)
Status in linux-azure package in Ubuntu:
Fix Released
Status in linux-azure source package in Cosmic:
Fix Released
Status in linux-azure source package in Disco:
Fix Released
Bug description:
Description:
To support VM instances with >255 vCPUS, we need the patch set below
backported to the Azure 4.18 kernel. These patches include -
- New Hyper-V IOMMU driver. This driver will be Hyper-V specific.
- Minor update to the Hyper-V specific virtual PCI code. Need to expand the
size of an array to allow for a larger number of vCPUs.
There are very large VM instance sizes coming to Azure in 2019, and
Ubuntu will require the following patches in order to function
properly:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/commit/?id=29217a4746835fef35279abbd12c1a1efe83bfca
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/commit/?id=84fdfafab849036b5aefa52824b5cb42e887ef0e
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/commit/?id=c8ccf7599ddac5fa48e06104c44b24709e21eed5
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/pci/controller
/pci-hyperv.c?id=9bc1174280ddf7693e8c29a8f1743809e987ac37
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