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    Subject[RFC V2 PATCH 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support
    Date
    From: Tianyu Lan <Tianyu.Lan@microsoft.com>


    Hyper-V provides two kinds of Isolation VMs. VBS(Virtualization-based
    security) and AMD SEV-SNP unenlightened Isolation VMs. This patchset
    is to add support for these Isolation VM support in Linux.

    The memory of these vms are encrypted and host can't access guest
    memory directly. Hyper-V provides new host visibility hvcall and
    the guest needs to call new hvcall to mark memory visible to host
    before sharing memory with host. For security, all network/storage
    stack memory should not be shared with host and so there is bounce
    buffer requests.

    Vmbus channel ring buffer already plays bounce buffer role because
    all data from/to host needs to copy from/to between the ring buffer
    and IO stack memory. So mark vmbus channel ring buffer visible to
    host.

    There are two exceptions - packets sent by vmbus_sendpacket_
    pagebuffer() and vmbus_sendpacket_mpb_desc(). These packets
    contains IO stack memory address and host will access these memory.
    So add Hyper-V DMA Ops and use DMA API in the netvsc and storvsc
    drivers to allocate bounce buffer via swiotlb interface.

    For SNP isolation VM, guest needs to access the shared memory via
    extra address space which is specified by Hyper-V CPUID HYPERV_CPUID_
    ISOLATION_CONFIG. The access physical address of the shared memory
    should be bounce buffer memory GPA plus with shared_gpa_boundary
    reported by CPUID.

    Change since v1:
    * Add DMA API support in the netvsc and storvsc driver.
    * Add Hyper-V DMA ops.
    * Add static branch for the check of isolation type snp.
    * Fix some code style comments.

    Tianyu Lan (12):
    x86/HV: Initialize GHCB page in Isolation VM
    x86/HV: Initialize shared memory boundary in Isolation VM
    x86/Hyper-V: Add new hvcall guest address host visibility support
    HV: Add Write/Read MSR registers via ghcb
    HV: Add ghcb hvcall support for SNP VM
    HV/Vmbus: Add SNP support for VMbus channel initiate message
    HV/Vmbus: Initialize VMbus ring buffer for Isolation VM
    UIO/Hyper-V: Not load UIO HV driver in the isolation VM.
    swiotlb: Add bounce buffer remap address setting function
    HV/IOMMU: Add Hyper-V dma ops support
    HV/Netvsc: Add Isolation VM support for netvsc driver
    HV/Storvsc: Add Isolation VM support for storvsc driver

    arch/x86/hyperv/Makefile | 2 +-
    arch/x86/hyperv/hv_init.c | 70 +++++--
    arch/x86/hyperv/ivm.c | 289 +++++++++++++++++++++++++++++
    arch/x86/include/asm/hyperv-tlfs.h | 22 +++
    arch/x86/include/asm/mshyperv.h | 90 +++++++--
    arch/x86/kernel/cpu/mshyperv.c | 5 +
    arch/x86/kernel/pci-swiotlb.c | 3 +-
    drivers/hv/channel.c | 44 ++++-
    drivers/hv/connection.c | 68 ++++++-
    drivers/hv/hv.c | 73 ++++++--
    drivers/hv/hyperv_vmbus.h | 3 +
    drivers/hv/ring_buffer.c | 83 ++++++---
    drivers/hv/vmbus_drv.c | 3 +
    drivers/iommu/hyperv-iommu.c | 127 +++++++++++++
    drivers/net/hyperv/hyperv_net.h | 11 ++
    drivers/net/hyperv/netvsc.c | 137 +++++++++++++-
    drivers/net/hyperv/rndis_filter.c | 3 +
    drivers/scsi/storvsc_drv.c | 67 ++++++-
    drivers/uio/uio_hv_generic.c | 5 +
    include/asm-generic/hyperv-tlfs.h | 1 +
    include/asm-generic/mshyperv.h | 18 +-
    include/linux/hyperv.h | 12 +-
    include/linux/swiotlb.h | 5 +
    kernel/dma/swiotlb.c | 13 +-
    mm/ioremap.c | 1 +
    mm/vmalloc.c | 1 +
    26 files changed, 1068 insertions(+), 88 deletions(-)
    create mode 100644 arch/x86/hyperv/ivm.c

    --
    2.25.1

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