Hi all Here we propose this patch series to make Linux run as the root partition [0] on Microsoft Hypervisor [1]. There will be a subsequent patch series to provide a device node (/dev/mshv) such that userspace programs can create and run virtual machines. We've also ported Cloud Hypervisor [3] over and have been able to boot a Linux guest with Virtio devices since late July 2020. This series implements only the absolutely necessary components to get things running. A large portion of this series consists of patches that augment hyperv-tlfs.h. They should be rather uncontroversial and can be applied right away. A few key things other than the changes to hyperv-tlfs.h: 1. Linux needs to setup existing Hyper-V facilities differently. 2. Linux needs to make a few hypercalls to bring up APs. 3. Interrupts are remapped by IOMMU, which is controlled by the hypervisor. Linux needs to make hypercalls to map and unmap interrupts. This is done by introducing a new MSI irqdomain and extending the remapping domain in hyperv-iommu. This series is now based on 5.11-rc2. Comments and suggestions are welcome. Thanks, Wei. [0] Just think of it like Xen's Dom0. [1] Hyper-V is more well-known, but it really refers to the whole stack including the hypervisor and other components that run in Windows kernel and userspace. [3] https://github.com/cloud-hypervisor/ Cc: sameo@xxxxxxxxxxxxxxx Cc: robert.bradford@xxxxxxxxx Cc: sebastien.boeuf@xxxxxxxxx Changes since v5: 1. Address Michael's comments. 2. Further improve and simplify code. 3. Drop a redundant patch and add one new patch for ACPI / NUMA code. Changes since v4: 1. Rework IO-APIC handling. Changes since v3: 1. Fix compilation errors. 2. Adapt to upstream changes. Changes since v2: 1. Address more comments from Vitaly. 2. Fix and test 32bit build. Changes since v1: 1. Simplify MSI IRQ domain implementation. 2. Address Vitaly's comments. Wei Liu (16): asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT x86/hyperv: detect if Linux is the root partition Drivers: hv: vmbus: skip VMBus initialization if Linux is root clocksource/hyperv: use MSR-based access if running as root x86/hyperv: allocate output arg pages if required x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary x86/hyperv: handling hypercall page setup for root ACPI / NUMA: add a stub function for node_to_pxm() x86/hyperv: provide a bunch of helper functions x86/hyperv: implement and use hv_smp_prepare_cpus asm-generic/hyperv: update hv_msi_entry asm-generic/hyperv: update hv_interrupt_entry asm-generic/hyperv: introduce hv_device_id and auxiliary structures asm-generic/hyperv: import data structures for mapping device interrupts x86/hyperv: implement an MSI domain for root partition iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition arch/x86/hyperv/Makefile | 4 +- arch/x86/hyperv/hv_init.c | 107 +++++++- arch/x86/hyperv/hv_proc.c | 219 ++++++++++++++++ arch/x86/hyperv/irqdomain.c | 387 ++++++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 23 ++ arch/x86/include/asm/mshyperv.h | 19 +- arch/x86/kernel/cpu/mshyperv.c | 49 ++++ drivers/clocksource/hyperv_timer.c | 3 + drivers/hv/vmbus_drv.c | 3 + drivers/iommu/hyperv-iommu.c | 177 ++++++++++++- drivers/pci/controller/pci-hyperv.c | 2 +- include/acpi/acpi_numa.h | 4 + include/asm-generic/hyperv-tlfs.h | 254 +++++++++++++++++- 13 files changed, 1230 insertions(+), 21 deletions(-) create mode 100644 arch/x86/hyperv/hv_proc.c create mode 100644 arch/x86/hyperv/irqdomain.c base-commit: e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62 -- 2.20.1